subject:(Bearing)

Texas A&M University

1. Jani, Hardik Yomesh. Measurements of the Static and Dynamic Force Performance on a Five-Pad, Spherical-Pivot Tilting-Pad Journal Bearing: Influence of Oil Flow Rate.

Degree: MS, Mechanical Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/188940

► Tilting-pad journal bearings (TPJB) are commonly utilized to support rotors in high-speed rotating machinery. They can provide significant load capacity, reduced drag power loss, and… (more)

▼ Tilting-pad journal bearings (TPJB) are commonly utilized to support rotors in high-speed rotating machinery. They can provide significant load capacity, reduced drag power loss, and a stable high-speed operation. Over the years, the design of TPJBs has developed to satisfy various performance needs. However, bearing pad high metal temperatures and drag power loss are a matter of concern to support the growing industry demand for high power capacity and efficient machines. For certain conditions involving lightly loaded bearing and/or evacuated housing configuration, TPJBs operate with a reduced oil flow rate which may cause subsynchronous rotor vibration (SSV) hash. In the past, many investigated the influence of supplied oil flow rate on the bearing steady-state characteristics; however, test data for the impact on its dynamic forced performance are scarce. This thesis presents and discusses the measurements of the static and dynamic forced performance of a TPJB under load-between-pad (LBP) orientation in the floating bearing test rig. In addition, it also discusses the influence of reduced supply oil flow rate (27% and 50% of nominal) and increased supply oil flow rate (150% of nominal) on the bearing static and dynamic forced properties. The test bearing has the following design characteristics: five pads, ball-in-socket (spherical) pivots, L/D = 0.4, pivot offset = 50%, clearance to radius ratio (Cᵣ/R) ≈ 0.0013, preload = 0.42, and pressurized flooded housing (with end seals). The operating test conditions include six shaft surface speeds (15-85 m/s) and seven specific loads (0.17 to 2.1 MPa). ISO VG 32 lubricates the test bearing with speed-dependent flow rate (100% nominal flow = 3.65 to 19.45 Lit/m) and at supply temperature of 49°C. The bearing steady-state performance parameters include the journal static equilibrium position, attitude angle, oil temperature rise, pad temperature rise, and drag power loss. The experimental drag power loss is obtained by two methods: (1) a direct measurement of drag torque and shaft angular speed, and (2) an estimation based on the oil flow rate and the oil temperature rise at the bearing exit plane. The dynamic forced performance parameters include rotordynamic force coefficients (stiffness, damping, and virtual-mass) obtained by a multi-frequency dynamic force excitation. Some of the test results are in a dimensionless form to characterize a general trend for TPJBs. The direct drag power loss is lower by ≈ 20% as compared to the estimated drag power loss for most operating conditions. Interestingly, the measured drag power loss is less dependent on the supplied oil flow rate as compared to the estimated drag power loss. A reduction in oil flow rate up to 50% of nominal magnitude causes an increase in the measured shaft eccentricity, pad temperature up to 6℃ and direct stiffness coefficient up to 5%, and a decrease in measured drag power loss up to 15% and direct damping coefficient up to 7%. For a single case of operation with 27% of nominal flow rate, the pad… Advisors/Committee Members: San Andrés, Luis A (advisor), Delgado, Adolfo (committee member), Hurlebaus, Stefan (committee member).

Subjects/Keywords: Fluid-film bearing; tilting-pad journal bearing

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APA (6^th Edition):

Jani, H. Y. (2018). Measurements of the Static and Dynamic Force Performance on a Five-Pad, Spherical-Pivot Tilting-Pad Journal Bearing: Influence of Oil Flow Rate. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/188940

Chicago Manual of Style (16^th Edition):

Jani, Hardik Yomesh. “Measurements of the Static and Dynamic Force Performance on a Five-Pad, Spherical-Pivot Tilting-Pad Journal Bearing: Influence of Oil Flow Rate.” 2018. Masters Thesis, Texas A&M University. Accessed March 09, 2021. http://hdl.handle.net/1969.1/188940.

MLA Handbook (7^th Edition):

Jani, Hardik Yomesh. “Measurements of the Static and Dynamic Force Performance on a Five-Pad, Spherical-Pivot Tilting-Pad Journal Bearing: Influence of Oil Flow Rate.” 2018. Web. 09 Mar 2021.

Vancouver:

Jani HY. Measurements of the Static and Dynamic Force Performance on a Five-Pad, Spherical-Pivot Tilting-Pad Journal Bearing: Influence of Oil Flow Rate. [Internet] [Masters thesis]. Texas A&M University; 2018. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1969.1/188940.

Council of Science Editors:

Jani HY. Measurements of the Static and Dynamic Force Performance on a Five-Pad, Spherical-Pivot Tilting-Pad Journal Bearing: Influence of Oil Flow Rate. [Masters Thesis]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/188940

2. Selvaraj A. Investigation on cage and roller slip of cylindrical solid and hollow roller bearings;.

Degree: Cage and roller slip of cylindrical solid and hollow roller bearings, 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/17483

►

Cylindrical roller bearings are used in many industrial machines newlineand automobiles because of their higher load carrying capacity at high speed newlineconditions. In most roller… (more)

Subjects/Keywords: Bearing; Cylindrical roller bearing; Mechanical engineering; Roller bearing cage

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APA (6^th Edition):

A, S. (2014). Investigation on cage and roller slip of cylindrical solid and hollow roller bearings;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/17483

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

A, Selvaraj. “Investigation on cage and roller slip of cylindrical solid and hollow roller bearings;.” 2014. Thesis, Anna University. Accessed March 09, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/17483.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

A, Selvaraj. “Investigation on cage and roller slip of cylindrical solid and hollow roller bearings;.” 2014. Web. 09 Mar 2021.

Vancouver:

A S. Investigation on cage and roller slip of cylindrical solid and hollow roller bearings;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Mar 09]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17483.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

A S. Investigation on cage and roller slip of cylindrical solid and hollow roller bearings;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/17483

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

3. Te Wierik, M.H.J. (author). Modeling and Experimental Validation of a Laval Rotor on Plain Journal- and Turbocharger Floating Ring Bearings - The Behavior of High Speed Rotors on Fluid Film Bearings.

Degree: 2016, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:a5fac91c-2ad7-419e-aa79-84e9c5d48519

►

The first part of this thesis elaborates on two numerical models of different levels of comprehensiveness of a Laval rotor on plain journal bearings. These… (more)

Subjects/Keywords: Hydrodynamic bearing; Floating ring bearing; Plain journal bearing; Laval rotor; Turbocharger; Whirl; Whip

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APA (6^th Edition):

Te Wierik, M. H. J. (. (2016). Modeling and Experimental Validation of a Laval Rotor on Plain Journal- and Turbocharger Floating Ring Bearings - The Behavior of High Speed Rotors on Fluid Film Bearings. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:a5fac91c-2ad7-419e-aa79-84e9c5d48519

Chicago Manual of Style (16^th Edition):

Te Wierik, M H J (author). “Modeling and Experimental Validation of a Laval Rotor on Plain Journal- and Turbocharger Floating Ring Bearings - The Behavior of High Speed Rotors on Fluid Film Bearings.” 2016. Masters Thesis, Delft University of Technology. Accessed March 09, 2021. http://resolver.tudelft.nl/uuid:a5fac91c-2ad7-419e-aa79-84e9c5d48519.

MLA Handbook (7^th Edition):

Te Wierik, M H J (author). “Modeling and Experimental Validation of a Laval Rotor on Plain Journal- and Turbocharger Floating Ring Bearings - The Behavior of High Speed Rotors on Fluid Film Bearings.” 2016. Web. 09 Mar 2021.

Vancouver:

Te Wierik MHJ(. Modeling and Experimental Validation of a Laval Rotor on Plain Journal- and Turbocharger Floating Ring Bearings - The Behavior of High Speed Rotors on Fluid Film Bearings. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Mar 09]. Available from: http://resolver.tudelft.nl/uuid:a5fac91c-2ad7-419e-aa79-84e9c5d48519.

Council of Science Editors:

Te Wierik MHJ(. Modeling and Experimental Validation of a Laval Rotor on Plain Journal- and Turbocharger Floating Ring Bearings - The Behavior of High Speed Rotors on Fluid Film Bearings. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:a5fac91c-2ad7-419e-aa79-84e9c5d48519

Oregon State University

4. Baker, Josiah D. Unsaturated Soils and Foundation Design : Theoretical Considerations for an Effective Stress Framework.

Degree: MS, Civil Engineering, 2016, Oregon State University

URL: http://hdl.handle.net/1957/59349

► This study presents the theoretical background necessary to model the bearing capacity of shallow and deep foundations in partially saturated soils. The conventional bearing capacity… (more)

Subjects/Keywords: matric suction; Bearing capacity

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APA (6^th Edition):

Baker, J. D. (2016). Unsaturated Soils and Foundation Design : Theoretical Considerations for an Effective Stress Framework. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/59349

Chicago Manual of Style (16^th Edition):

Baker, Josiah D. “Unsaturated Soils and Foundation Design : Theoretical Considerations for an Effective Stress Framework.” 2016. Masters Thesis, Oregon State University. Accessed March 09, 2021. http://hdl.handle.net/1957/59349.

MLA Handbook (7^th Edition):

Baker, Josiah D. “Unsaturated Soils and Foundation Design : Theoretical Considerations for an Effective Stress Framework.” 2016. Web. 09 Mar 2021.

Vancouver:

Baker JD. Unsaturated Soils and Foundation Design : Theoretical Considerations for an Effective Stress Framework. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1957/59349.

Council of Science Editors:

Baker JD. Unsaturated Soils and Foundation Design : Theoretical Considerations for an Effective Stress Framework. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59349

Texas A&M University

5. Den, Sean. Analysis of Force Coefficients and Dynamic Pressures for Short-Length (L/D=0.2) Open-Ends Squeeze Film Dampers.

Degree: MS, Mechanical Engineering, 2015, Texas A&M University

URL: http://hdl.handle.net/1969.1/174215

► Gas turbine engine manufacturers push for increasingly simpler squeeze film damper (SFD) designs that can still provide necessary damping to suppress rotor vibrations and offer… (more)

▼ Gas turbine engine manufacturers push for increasingly simpler squeeze film damper (SFD) designs that can still provide necessary damping to suppress rotor vibrations and offer stability to rotor-bearing systems. The work in this thesis addresses to industry needs by analyzing the experimental and predicted dynamic force performance of a very simply configured test SFD. The SFD incorporates three lubricant feedholes spaced 120° apart, a single short-length (L/D=0.2, L=2.54 cm) film land with no central feed groove, no end grooves for the provision sealing mechanisms (open-ends), and a nominal radial clearance c=0.267 mm (c/R=0.004). Analysis of the SFD performing whirl orbits with various amplitude (r) and departing from various static eccentricity (es) endeavors to reveal the dynamic performance of SFDs to events in gas turbine engine operation such as a blade loss, or a change in eccentricity. Circular (rX=rY) whirl orbits of the SFD with amplitude r/c=0.05 to 0.71, and departing from static eccentricity, es/c=0 to 0.86 lead to identification of the squeeze film force coefficients and measurements of the dynamic film pressures over the various dynamic operating conditions. Comparisons of experimentally identified force coefficients to those predicted by a finite element orbit-based model as well as those predicted by the classical short-length open-ends SFD theory strive to evaluate the accuracy of the state-of-the-art in SFD performance prediction. Comparisons of experimental results for the current SFD (termed damper 1) against that of two SFDs with similar configurations (dampers 2 and 3) examined in prior art, advance the simplicity of SFD design by highlighting the effects of a smaller radial clearance (in damper 2) and the effects of end grooves (in damper 3) on SFD dynamic force performance. Experimentally identified force coefficients for the current damper (#1) show moderate growth with orbit amplitude and strong nonlinear growth with static eccentricity, in particular at a largely off-centered position. Added mass coefficients for damper 1 increase with static eccentricity and, unexpectedly, with orbit amplitude. The experimentally identified SFD force coefficients for damper 1 exhibit excellent agreement with predicted force coefficients from the orbit-based model and the short-length open-ends model for whirl orbits departing from centered to slightly off-centered positions (e/c < 0.4) and with a small orbit amplitude (r/c < 0.4). The fluid film dynamic peak-to-peak (p-p) pressures exhibit a strong growth with orbit amplitude, and a moderate growth with static eccentricity. Inconsistent increases in p-p pressure with whirl frequency demonstrate the occurrence of air ingestion for motions with a large orbit amplitude or departing from a large static eccentricity. Comparisons of the current damper (damper 1) with damper 2 and 3 demonstrate that the damping and added mass force coefficients closely follow geometric ratios (L/c)³ and (L³/c), respectively, derived from the short-length open-ends… Advisors/Committee Members: San Andres, Luis A (advisor), Polycarpou, Andreas (committee member), Kim, Yong-Joe (committee member), Kuttolamadom, Mathew (committee member).

Subjects/Keywords: Turbomachinery; Rotordynamics; SFD; Vibration; Bearing

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APA (6^th Edition):

Den, S. (2015). Analysis of Force Coefficients and Dynamic Pressures for Short-Length (L/D=0.2) Open-Ends Squeeze Film Dampers. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174215

Chicago Manual of Style (16^th Edition):

Den, Sean. “Analysis of Force Coefficients and Dynamic Pressures for Short-Length (L/D=0.2) Open-Ends Squeeze Film Dampers.” 2015. Masters Thesis, Texas A&M University. Accessed March 09, 2021. http://hdl.handle.net/1969.1/174215.

MLA Handbook (7^th Edition):

Den, Sean. “Analysis of Force Coefficients and Dynamic Pressures for Short-Length (L/D=0.2) Open-Ends Squeeze Film Dampers.” 2015. Web. 09 Mar 2021.

Vancouver:

Den S. Analysis of Force Coefficients and Dynamic Pressures for Short-Length (L/D=0.2) Open-Ends Squeeze Film Dampers. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1969.1/174215.

Council of Science Editors:

Den S. Analysis of Force Coefficients and Dynamic Pressures for Short-Length (L/D=0.2) Open-Ends Squeeze Film Dampers. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/174215

Texas A&M University

6. Klooster, David. Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air.

Degree: MS, Mechanical Engineering, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7444

► A hybrid bearing designed for use in a next generation turbo-pump is evaluated for the performance of initial lift-off, referred to as start-transient. The radial… (more)

▼ A hybrid bearing designed for use in a next generation turbo-pump is evaluated for the performance of initial lift-off, referred to as start-transient. The radial test rig features a high-speed spindle motor capable of 20,000 rpm that drives a 718 Inconel rotor attached via a high-speed coupling. The drive end is supported by ceramic ball bearings, while the hybrid bearing supports the opposite end. A magnetic bearing delivers the applied loading along the mid-span of the rotor. Many parameters, including ramp rate [rpm/s] (drive torque), supply pressure at 15,000 rpm, magnitude of the applied load, and load orientation, are varied to simulate different start-transient scenarios. The data are recorded in .dat files for future evaluation of transient predictions. Analysis of the data includes an evaluation of hydrodynamic and hydrostatic liftoff, an assessment of rub from passing through a lightly damped critical speed, and observation of pneumatic hammer instability. Hydrodynamic lift-off occurs when the hydrodynamic pressure, resulting from the relative motion of two surfaces, overcomes the forces acting on the rotor; no indication of hydrodynamic lift-off is provided. Hydrostatic lift-off results from the external supply pressure (which for this test rig is speed dependent) overcoming the forces acting on the rotor as determined from rotor centerline plots. With 0.263 bar applied unit load in the vertical direction, hydrostatic lift-off occurs at 0 rpm and 2.08 bar supply pressure. With a much higher load of 1.53 bar, hydrostatic lift-off is at 12,337 rpm and 10.7 bar supply pressure. The required supply pressure for hydrostatic lift-off is approximately a linear function of the applied unit load. In a turbopump, hydrostatic lift-off depends on the speed because the supply pressure is proportional to the speed squared. With the load in the horizontal direction, hydrostatic lift-off occurs at lower speeds and pressures. The ramp rate did not affect the required supply pressure for hydrostatic lift-off. A lower supply pressure at 15,000 rpm lowered the required supply pressure for hydrostatic liftoff as well as the natural frequencies creating a rub. The hydrostatic lift-off speed should be minimized to avoid damage to the rotor/bearing surfaces due to contact. Advisors/Committee Members: Childs, Dara (advisor), Palazzolo, Alan (committee member), Beason, Lynn (committee member).

Subjects/Keywords: Transient; Lift-off; Hybrid Bearing

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APA (6^th Edition):

Klooster, D. (2011). Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7444

Chicago Manual of Style (16^th Edition):

Klooster, David. “Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air.” 2011. Masters Thesis, Texas A&M University. Accessed March 09, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7444.

MLA Handbook (7^th Edition):

Klooster, David. “Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air.” 2011. Web. 09 Mar 2021.

Vancouver:

Klooster D. Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7444.

Council of Science Editors:

Klooster D. Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7444

Texas A&M University

7. Hensley, John Eric. Rotordynamic coefficients for a load-between-pad, flexible-pivot tilting pad bearing at high loads.

Degree: MS, Mechanical Engineering, 2006, Texas A&M University

URL: http://hdl.handle.net/1969.1/4404

► The dynamic and static performance of a flexure-pivot tilting pad bearing is presented at a load between pad configuration for various load and speed combinations.… (more)

▼ The dynamic and static performance of a flexure-pivot tilting pad bearing is presented at a load between pad configuration for various load and speed combinations. A similar work performed on the same bearing at lower loads ranging from 0-1 MPa (0-150 psi) by Al-Ghasem was tested, whereas the current work investigates effects in the load range between 1-2.2 MPa (150-320 psi). The bearing design parameters include: 4 pads with pad arc angle 72ÃÂº and 50% pivot offset, pad axial length 0.0762 m (3 in), pad radial clearance 0.254 mm (0.010 in), bearing radial clearance 190.5 ÃÂµm (0.0075 in), preload 0.25, and shaft nominal diameter of 0.11684 m (4.600 in). An important distinction between the two sets of tests is the difference in experimental bearing radial clearance, which for this case measured 208 ÃÂµm (0.00082 in), and for Al-GhasemÃ¢ÂÂs was 165.1 ÃÂµm (0.0065 in). The rotordynamic coefficients are determined experimentally using a test rig equipped with motion and load sensors. The rig is modeled using NewtonÃ¢ÂÂs laws, which is converted from the time to frequency domain using Fourier Transform to give complex dynamic stiffnesses. From the resulting complex dynamic stiffnesses the associated real and imaginary components are plotted as a function of excitation frequency and curve fitted via linear regression to give the rotordynamic coefficients. The primary objectives were to determine whether the real component of the complex dynamic stiffnesses could be better modeled with or without the mass coefficient and to contrast the rotordynamic coefficients with an analytical model. Only in the load range of 1 to 2.2 MPa were the unloaded direct mass coefficients near or at 0, which would allow for a [K][C] model to be used. The remaining real components are better represented with the mass term. The analytical model generally overpredicted the stiffness, damping and mass coefficients, especially for the direct components; the trends were generally consistent. Advisors/Committee Members: Childs, Dara W. (advisor), Childs, S. Bart (committee member), Vance, John (committee member).

Subjects/Keywords: Bearing; Pivot

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APA (6^th Edition):

Hensley, J. E. (2006). Rotordynamic coefficients for a load-between-pad, flexible-pivot tilting pad bearing at high loads. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4404

Chicago Manual of Style (16^th Edition):

Hensley, John Eric. “Rotordynamic coefficients for a load-between-pad, flexible-pivot tilting pad bearing at high loads.” 2006. Masters Thesis, Texas A&M University. Accessed March 09, 2021. http://hdl.handle.net/1969.1/4404.

MLA Handbook (7^th Edition):

Hensley, John Eric. “Rotordynamic coefficients for a load-between-pad, flexible-pivot tilting pad bearing at high loads.” 2006. Web. 09 Mar 2021.

Vancouver:

Hensley JE. Rotordynamic coefficients for a load-between-pad, flexible-pivot tilting pad bearing at high loads. [Internet] [Masters thesis]. Texas A&M University; 2006. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1969.1/4404.

Council of Science Editors:

Hensley JE. Rotordynamic coefficients for a load-between-pad, flexible-pivot tilting pad bearing at high loads. [Masters Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/4404

Texas A&M University

8. Al Jughaiman, Bader K. Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing.

Degree: MS, Mechanical Engineering, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1816

► This thesis compares experimental static and dynamic force characteristics for a two-axial-groove bearing and a pressure-dam bearing without a relief track. The thesis also compares… (more)

Subjects/Keywords: Bearing; rotordynamic

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APA (6^th Edition):

Al Jughaiman, B. K. (2009). Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1816

Chicago Manual of Style (16^th Edition):

Al Jughaiman, Bader K. “Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing.” 2009. Masters Thesis, Texas A&M University. Accessed March 09, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1816.

MLA Handbook (7^th Edition):

Al Jughaiman, Bader K. “Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing.” 2009. Web. 09 Mar 2021.

Vancouver:

Al Jughaiman BK. Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1816.

Council of Science Editors:

Al Jughaiman BK. Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1816

9. Zhou, Yuxin. On the mechanical ageing of lubricating greases.

Degree: 2018, University of Twente

URL: https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 10.3990/1.9789036546140 ; urn:isbn:978-90-365-4614-0 ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html

► This thesis focuses on the mechanical degradation of lubricating greases, including the change of thickener micro-structure and rheological properties as well as the influence of… (more)

▼ This thesis focuses on the mechanical degradation of lubricating greases, including the change of thickener micro-structure and rheological properties as well as the influence of the mechanical degradation of grease on the bearing lubricant film thickness. Grease is a multi-phase material, where the base oil is trapped within the thickener network by a combination of Van der Waals and capillary forces. Inside a bearing, grease will act as a reservoir releasing lubricant into the contact area. During bearing operation, mechanical degradation of the grease is observed, reflected by the change of grease consistency, grease bleed, apparent viscosity, etc. This will lead to a loss of lubricant, severe starvation and ultimately the failure of the bearing. The thesis starts with the ageing mechanism for lubricating greases with a fibre-like thickener structure (including lithium-based, lithium-complex-based and polyurea-based greases). Under shear, grease softening is found. The change of the rheological properties of the grease shows a two-phase ageing behaviour. The degradation is initially fast but subsequently slows down. This degradation is closely related to the change of the thickener micro-structure. In addition to shear, high temperatures will accelerate the ageing process following an Arrhenius behaviour. Based on these observations, an Ageing Master Curve is constructed using an energy concept. This model is later validated using a grease worker and applied to the grease ageing process inside a rolling bearing. As a comparison to the fibre-like thickener structure greases, the ageing of calcium sulphonate complex grease is investigated. Different from the greases mentioned above, calcium sulphonate complex grease has a particle-like thickener structure that is difficult to break under shear, hence no shear softening is observed. As a result, the Ageing Master Curve is not applicable for this type of grease. The ultimate goal of grease lubrication is to provide the bearing contacts with a separating film. This is why the influence of grease mechanical ageing on the film thickness is studied as well. The grease film thickness deviates from the calculated elastohydrodynamic film thickness (assuming lubrication by the base oil under fully flooded conditions). The grease film thickness appears to be influenced by churning, channelling, change of grease bleed and rheological properties caused by shear and/or temperature. In addition, the thickener fragments generated by mechanical degradation also contribute to the film thickness. The results from the work described in this thesis give an important contribution to the development of rolling bearing grease life models. These models can then be used for the calculation of maintenance intervals. Advisors/Committee Members: Lugt, Pieter Martin, Bosman, Rob.

Subjects/Keywords: grease; bearing

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APA (6^th Edition):

Zhou, Y. (2018). On the mechanical ageing of lubricating greases. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 10.3990/1.9789036546140 ; urn:isbn:978-90-365-4614-0 ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html

Chicago Manual of Style (16^th Edition):

Zhou, Yuxin. “On the mechanical ageing of lubricating greases.” 2018. Doctoral Dissertation, University of Twente. Accessed March 09, 2021. https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 10.3990/1.9789036546140 ; urn:isbn:978-90-365-4614-0 ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html.

MLA Handbook (7^th Edition):

Zhou, Yuxin. “On the mechanical ageing of lubricating greases.” 2018. Web. 09 Mar 2021.

Vancouver:

Zhou Y. On the mechanical ageing of lubricating greases. [Internet] [Doctoral dissertation]. University of Twente; 2018. [cited 2021 Mar 09]. Available from: https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 10.3990/1.9789036546140 ; urn:isbn:978-90-365-4614-0 ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html.

Council of Science Editors:

Zhou Y. On the mechanical ageing of lubricating greases. [Doctoral Dissertation]. University of Twente; 2018. Available from: https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; 10.3990/1.9789036546140 ; urn:isbn:978-90-365-4614-0 ; urn:nbn:nl:ui:28-25c5a8a9-35f5-41d0-8f33-da2f35dcc60f ; https://research.utwente.nl/en/publications/on-the-mechanical-ageing-of-lubricating-greases(25c5a8a9-35f5-41d0-8f33-da2f35dcc60f).html

University of Manchester

10. He, Yuchuan. Bearing behaviour of lap joints to thin-walled steel plates at ambient and elevated temperatures.

Degree: PhD, 2012, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/bearing-behaviour-of-lap-joints-to-thinwalled-steel-plates-at-ambient-and-elevated-temperatures(a2dcf328-3435-4fbf-86b8-e3aff0ad998f).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555533

► This thesis presents the results of a comprehensive research study of the bearing behaviour of single or multiple bolted plates in bolt shear at ambient… (more)

Subjects/Keywords: 624.1; Thin-walled; Bearing behaviour

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

He, Y. (2012). Bearing behaviour of lap joints to thin-walled steel plates at ambient and elevated temperatures. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/bearing-behaviour-of-lap-joints-to-thinwalled-steel-plates-at-ambient-and-elevated-temperatures(a2dcf328-3435-4fbf-86b8-e3aff0ad998f).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555533

Chicago Manual of Style (16^th Edition):

He, Yuchuan. “Bearing behaviour of lap joints to thin-walled steel plates at ambient and elevated temperatures.” 2012. Doctoral Dissertation, University of Manchester. Accessed March 09, 2021. https://www.research.manchester.ac.uk/portal/en/theses/bearing-behaviour-of-lap-joints-to-thinwalled-steel-plates-at-ambient-and-elevated-temperatures(a2dcf328-3435-4fbf-86b8-e3aff0ad998f).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555533.

MLA Handbook (7^th Edition):

He, Yuchuan. “Bearing behaviour of lap joints to thin-walled steel plates at ambient and elevated temperatures.” 2012. Web. 09 Mar 2021.

Vancouver:

He Y. Bearing behaviour of lap joints to thin-walled steel plates at ambient and elevated temperatures. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2021 Mar 09]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/bearing-behaviour-of-lap-joints-to-thinwalled-steel-plates-at-ambient-and-elevated-temperatures(a2dcf328-3435-4fbf-86b8-e3aff0ad998f).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555533.

Council of Science Editors:

He Y. Bearing behaviour of lap joints to thin-walled steel plates at ambient and elevated temperatures. [Doctoral Dissertation]. University of Manchester; 2012. Available from: https://www.research.manchester.ac.uk/portal/en/theses/bearing-behaviour-of-lap-joints-to-thinwalled-steel-plates-at-ambient-and-elevated-temperatures(a2dcf328-3435-4fbf-86b8-e3aff0ad998f).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555533

Uppsala University

11. Adolfsson, Erik. Simplified finite element bearing modeling : with NX Nastran.

Degree: Applied Mechanics, 2015, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255398

► This report was produced at the request of ABB Robotics and the work was conducted at their facilities in Västerås, Sweden. In the development… (more)

▼ This report was produced at the request of ABB Robotics and the work was conducted at their facilities in Västerås, Sweden. In the development of industrial robots the structures are slimmed to increase the accuracy and speed. When conducting finite element analysis on the robots the accuracy of the component modelling and definitions of the boundary conditions becomes more important. One such component is the ball bearing which consist of several parts and has a nonlinear behavior where the balls are in contact with the rings. The task given was to develop new methods to model roller bearings in Siemens finite element modelling software NX Nastran. Then conduct a strain measurement, to compare the methods to real experimental values. The goal with the report is to find one or more methods to model roller bearings, with accurate results, that can beused in their development work. The report was conducted by first doing a study on bearings and finite element modeling, and learning to use the software NX Nastran. Then the development of the methods were done by generating ideas for bearing models and testing them on simple structures. Nine methods was produced and a tenth, the method used to model bearings today, was used as a reference. The methods was used to build bearing models in a finite element model of a six axis robot wrist. Simulations were done on the models with different load cases and the results were compared to a strain measurement of the wrists real counterpart. Only six of the models were analyzed in the result, since four of the models returned results that were deemed unusable. When compiling the result data no model was found to accurately recreate the stresses in every load case. Three methods, that allow deformation, performed similarly. One of them is suggested to be used as modelling method in the future. Worst of the methods, according to the results compiled, was found to be the method used today. It fails to describe local stresses around the bearing. For continued work it is suggested that linear contact elements is studied further. Four out of five models constructed with linear contact elements failed to return satisfactory results.

Subjects/Keywords: ball bearing; simplified; model; FEM

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Adolfsson, E. (2015). Simplified finite element bearing modeling : with NX Nastran. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255398

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Adolfsson, Erik. “Simplified finite element bearing modeling : with NX Nastran.” 2015. Thesis, Uppsala University. Accessed March 09, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255398.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Adolfsson, Erik. “Simplified finite element bearing modeling : with NX Nastran.” 2015. Web. 09 Mar 2021.

Vancouver:

Adolfsson E. Simplified finite element bearing modeling : with NX Nastran. [Internet] [Thesis]. Uppsala University; 2015. [cited 2021 Mar 09]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255398.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Adolfsson E. Simplified finite element bearing modeling : with NX Nastran. [Thesis]. Uppsala University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255398

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

12. Bos, V. (author). Traffic induced bearing loads and movements of a steel plate-girder bridge.

Degree: 2011, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:8f222f58-eddb-4024-9aab-9ef99745b499

►

Structural bearings in bridges are subjected to loads and movements, causing wear of bearing components as PTFE-sheets, guides and internal seals. Nowadays, these components are… (more)

Subjects/Keywords: Bearing; Wear; Plate-girder bridge

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APA (6^th Edition):

Bos, V. (. (2011). Traffic induced bearing loads and movements of a steel plate-girder bridge. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8f222f58-eddb-4024-9aab-9ef99745b499

Chicago Manual of Style (16^th Edition):

Bos, V (author). “Traffic induced bearing loads and movements of a steel plate-girder bridge.” 2011. Masters Thesis, Delft University of Technology. Accessed March 09, 2021. http://resolver.tudelft.nl/uuid:8f222f58-eddb-4024-9aab-9ef99745b499.

MLA Handbook (7^th Edition):

Bos, V (author). “Traffic induced bearing loads and movements of a steel plate-girder bridge.” 2011. Web. 09 Mar 2021.

Vancouver:

Bos V(. Traffic induced bearing loads and movements of a steel plate-girder bridge. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Mar 09]. Available from: http://resolver.tudelft.nl/uuid:8f222f58-eddb-4024-9aab-9ef99745b499.

Council of Science Editors:

Bos V(. Traffic induced bearing loads and movements of a steel plate-girder bridge. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:8f222f58-eddb-4024-9aab-9ef99745b499

University of Windsor

13. Patel, Nikunj Rashmikant. Accelerated Testing of Bearings for High Speed Application.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 2020, University of Windsor

URL: https://scholar.uwindsor.ca/etd/8326

► In this research thesis, a new method for accelerated lifetime testing (ALT) of high-speed bearings is discussed. The rapid development of products, and the longer… (more)

Subjects/Keywords: Accelerated; Bearing; Fault Detection; Testing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Patel, N. R. (2020). Accelerated Testing of Bearings for High Speed Application. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/8326

Chicago Manual of Style (16^th Edition):

Patel, Nikunj Rashmikant. “Accelerated Testing of Bearings for High Speed Application.” 2020. Masters Thesis, University of Windsor. Accessed March 09, 2021. https://scholar.uwindsor.ca/etd/8326.

MLA Handbook (7^th Edition):

Patel, Nikunj Rashmikant. “Accelerated Testing of Bearings for High Speed Application.” 2020. Web. 09 Mar 2021.

Vancouver:

Patel NR. Accelerated Testing of Bearings for High Speed Application. [Internet] [Masters thesis]. University of Windsor; 2020. [cited 2021 Mar 09]. Available from: https://scholar.uwindsor.ca/etd/8326.

Council of Science Editors:

Patel NR. Accelerated Testing of Bearings for High Speed Application. [Masters Thesis]. University of Windsor; 2020. Available from: https://scholar.uwindsor.ca/etd/8326

University of New South Wales

14. Hu, Chongqing. Vibration based diagnostics for bearing faults and gear wear.

Degree: Mechanical & Manufacturing Engineering, 2016, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/56242 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40372/SOURCE02?view=true

► This thesis investigates vibration based machine condition monitoring and consists of two parts: bearing fault diagnosis and gear wear monitoring.In the first part, a signal… (more)

▼ This thesis investigates vibration based machine condition monitoring and consists of two parts: bearing fault diagnosis and gear wear monitoring.In the first part, a signal processing method to diagnose localised bearing faults in the presence of periodic impulsive noise has been developed and tested on signals measured from two rigs. The method developed for bearing diagnosis aims at selecting suitable frequency bands that exclude those impulsive noises and retain the feature of impulsiveness of bearing fault signals. This is realised by using a parameter considering the energy and energy distribution of envelope signals in the frequency domain, and its efficiency is demonstrated by comparison with the Fast Kurtogram and Protrugram. The second part presents a newly developed vibration indicator for the monitoring of gear wear. Even though gear vibrations are closely related with tooth wear, a vibration based wear monitoring method has not been well established. In this work, an averaged logarithmic ratio (ALR) is calculated from time synchronous averaged gear signals to evaluate the effects of tooth wear on gear transmissions. The indicator ALR, calculated with a fixed reference, can be used as a wear severity index, while an alternative version of the indicator, mALR, is calculated with a moving reference and can be used to show the evolution of gear transmission features. In addition, these indicators can also be used as a general parameter for gearbox condition monitoring.Based on the proposed vibration indicators, a framework is established to integrate vibration and wear particle analysis for gear condition monitoring. In the framework, the proposed vibration indicators are first used for fault detection and classification. The faults are then categorised into two groups, structure- and wear-related faults, which dictates how the analysis methods are applied and ensures that wear particle analysis is only used when strictly required. The feasibility and efficiency of this framework are demonstrated by application to three laboratory gear tests, with promising results. Advisors/Committee Members: Peng, Zhongxiao, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Randall, Robert, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Smith, Wade, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Gear; Vibration; Rolling element bearing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hu, C. (2016). Vibration based diagnostics for bearing faults and gear wear. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/56242 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40372/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Hu, Chongqing. “Vibration based diagnostics for bearing faults and gear wear.” 2016. Doctoral Dissertation, University of New South Wales. Accessed March 09, 2021. http://handle.unsw.edu.au/1959.4/56242 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40372/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Hu, Chongqing. “Vibration based diagnostics for bearing faults and gear wear.” 2016. Web. 09 Mar 2021.

Vancouver:

Hu C. Vibration based diagnostics for bearing faults and gear wear. [Internet] [Doctoral dissertation]. University of New South Wales; 2016. [cited 2021 Mar 09]. Available from: http://handle.unsw.edu.au/1959.4/56242 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40372/SOURCE02?view=true.

Council of Science Editors:

Hu C. Vibration based diagnostics for bearing faults and gear wear. [Doctoral Dissertation]. University of New South Wales; 2016. Available from: http://handle.unsw.edu.au/1959.4/56242 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:40372/SOURCE02?view=true

University of Namibia

15. Kakehongo, Ndiitodino. Factors affecting cervical cancer screening among women of child bearing age, attending Intermediate Hospital Oshakati (IHO), Oshana region, Namibia: A case-control study .

Degree: 2018, University of Namibia

URL: http://hdl.handle.net/11070/2241

► Cervical cancer is the second most prevalent cancer among women after breast cancer, in Namibia. Human Papilloma Virus is the significant cause of cervical cancer… (more)

▼ Cervical cancer is the second most prevalent cancer among women after breast cancer, in Namibia. Human Papilloma Virus is the significant cause of cervical cancer prevalence worldwide with an estimation of 99.7%. The World Health Organisation (WHO) predict that Cervical cancer will kill >443,000 women worldwide every year by 2030, nearly 90% of them in Sub-Saharan Africa. Nevertheless, cervical cancer is potentially preventable through HPV vaccination, early diagnosis of pre-invasive cancer cells and early diagnosis of proven cases of cervical cancer neoplasia. Cervical cancer screening and early treatment of pre-invasive cervical cancer remain the most effective ways to reduce cervical cancer mortalities. A significant number of women in Oshana region do not utilize the cervical cancer screening services despite a well-established free cervical cancer screening programme in the region .This study examined factors associated with cervical cancer screening and determined associations between cervical cancer screening and identified factors. An unmatched 1:1 case control study was conducted on 207 cases and 207 controls. A case was defined as any woman aged 15-49 years, seeking services at Intermediate Hospital Oshakati ante-natal clinic during the study period, and never had cervical cancer screening in her life time. A control was any woman aged 15-49 years, seeking services at Intermediate Hospital Oshakati ante-natal clinic during the study period, had cervical cancer screening in her life time. Data were collected using a self-administered structured questionnaire between September and October 2017. Data were analysed with Epi-info 7.2. Bivariate analysis was conducted to determine the odds ratio at 95% CI. Factors which were significant at p-value <0.05 were retained in the multiple logistic regression analysis model. Cases were significantly younger than controls (AOR= 3.10, 95% CI: 1.41 - 9.23, P-value=0.001). Increased parity was found to be an important determinant for being screened for cervical cancer (AOR= 4.50, 95% CI: 2.25-9.02, P-v= 0.001). The multivariate analysis found that, fear screening will reveal cervical cancer (AOR= 0.54, 95% CI:0.34 - 0.85, P-v= 0.008), fear of pain from the procedure (AOR= 0.23,95% CI:0.15 - 0.64 P-v= 0.001), lack of signs and symptoms of the disease (AOR= 0.41, 95% CI:0.26 - 0.64, P-v= 0.001) and low perceived risk of the disease (AOR= 0.54, 95% CI: 0.34 - 0.85, P-v= 0.007) were most significantly associated with cervical cancer screening. Identified factors may serve as targets for cervical cancer screening health education interventions by health care health workers. There is need to develop targeted interventions which will promote utilization of cervical cancer screening inclusive of young women.

Subjects/Keywords: Cervical cancer; Child bearing age

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kakehongo, N. (2018). Factors affecting cervical cancer screening among women of child bearing age, attending Intermediate Hospital Oshakati (IHO), Oshana region, Namibia: A case-control study . (Thesis). University of Namibia. Retrieved from http://hdl.handle.net/11070/2241

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kakehongo, Ndiitodino. “Factors affecting cervical cancer screening among women of child bearing age, attending Intermediate Hospital Oshakati (IHO), Oshana region, Namibia: A case-control study .” 2018. Thesis, University of Namibia. Accessed March 09, 2021. http://hdl.handle.net/11070/2241.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kakehongo, Ndiitodino. “Factors affecting cervical cancer screening among women of child bearing age, attending Intermediate Hospital Oshakati (IHO), Oshana region, Namibia: A case-control study .” 2018. Web. 09 Mar 2021.

Vancouver:

Kakehongo N. Factors affecting cervical cancer screening among women of child bearing age, attending Intermediate Hospital Oshakati (IHO), Oshana region, Namibia: A case-control study . [Internet] [Thesis]. University of Namibia; 2018. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/11070/2241.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kakehongo N. Factors affecting cervical cancer screening among women of child bearing age, attending Intermediate Hospital Oshakati (IHO), Oshana region, Namibia: A case-control study . [Thesis]. University of Namibia; 2018. Available from: http://hdl.handle.net/11070/2241

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Aberdeen

16. Ip, Pui Shum. A theological concept of testimony.

Degree: PhD, 2013, University of Aberdeen

URL: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153023500005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577605

► This thesis explores the notion of testimony as a theological concept. The task of this thesis is twofold: first, to analyze several exemplary instances of… (more)

Subjects/Keywords: 200; Witness bearing (Christianity)

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APA (6^th Edition):

Ip, P. S. (2013). A theological concept of testimony. (Doctoral Dissertation). University of Aberdeen. Retrieved from https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153023500005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577605

Chicago Manual of Style (16^th Edition):

Ip, Pui Shum. “A theological concept of testimony.” 2013. Doctoral Dissertation, University of Aberdeen. Accessed March 09, 2021. https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153023500005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577605.

MLA Handbook (7^th Edition):

Ip, Pui Shum. “A theological concept of testimony.” 2013. Web. 09 Mar 2021.

Vancouver:

Ip PS. A theological concept of testimony. [Internet] [Doctoral dissertation]. University of Aberdeen; 2013. [cited 2021 Mar 09]. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153023500005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577605.

Council of Science Editors:

Ip PS. A theological concept of testimony. [Doctoral Dissertation]. University of Aberdeen; 2013. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12153023500005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577605

Penn State University

17. Lalwani, Dipesh Suresh. Mechanistic Model for Lead Rubber Bearings.

Degree: 2017, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/13868dbl5205

► Seismic isolation is a technique used to shift the fundamental period of a structure to a long range period which reduces the forces a structure… (more)

Subjects/Keywords: elastomeric; lead rubber bearing; seismic isolation; seismic isolation bearing model

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APA (6^th Edition):

Lalwani, D. S. (2017). Mechanistic Model for Lead Rubber Bearings. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/13868dbl5205

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lalwani, Dipesh Suresh. “Mechanistic Model for Lead Rubber Bearings.” 2017. Thesis, Penn State University. Accessed March 09, 2021. https://submit-etda.libraries.psu.edu/catalog/13868dbl5205.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lalwani, Dipesh Suresh. “Mechanistic Model for Lead Rubber Bearings.” 2017. Web. 09 Mar 2021.

Vancouver:

Lalwani DS. Mechanistic Model for Lead Rubber Bearings. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Mar 09]. Available from: https://submit-etda.libraries.psu.edu/catalog/13868dbl5205.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lalwani DS. Mechanistic Model for Lead Rubber Bearings. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/13868dbl5205

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

18. Gunhardson, Erica. Indoor Positioning Using Angle of Departure Information.

Degree: The Institute of Technology, 2015, Linköping UniversityLinköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122914

► I detta examensarbete undersöks möjligheten att kunna använda en positioneringsmetod som inte enbart förlitar sig på den uppmätta signalstyrkan. Istället används en metod som… (more)

Subjects/Keywords: IPS; DF; MISO; EKF; Bearing-Only; Bearing-Range; MUSIC

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APA (6^th Edition):

Gunhardson, E. (2015). Indoor Positioning Using Angle of Departure Information. (Thesis). Linköping UniversityLinköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122914

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gunhardson, Erica. “Indoor Positioning Using Angle of Departure Information.” 2015. Thesis, Linköping UniversityLinköping University. Accessed March 09, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122914.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gunhardson, Erica. “Indoor Positioning Using Angle of Departure Information.” 2015. Web. 09 Mar 2021.

Vancouver:

Gunhardson E. Indoor Positioning Using Angle of Departure Information. [Internet] [Thesis]. Linköping UniversityLinköping University; 2015. [cited 2021 Mar 09]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122914.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gunhardson E. Indoor Positioning Using Angle of Departure Information. [Thesis]. Linköping UniversityLinköping University; 2015. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122914

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

19. de Haan, Gerardo (author). Methodology for Bearing-Bypass Testing in Fibre Metal Laminates.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:85dd2d77-7f5f-4a5f-a90c-465b789afd42

► Bearing-bypass behaviour for composites is different than for metals and therefore this behaviour needs to be re-evaluated. This thesis work aims to provide an initial… (more)

Subjects/Keywords: fml; bearing-bypass; fibre metal laminate; bearing; blunt notch; DIC; Glare

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APA (6^th Edition):

de Haan, G. (. (2018). Methodology for Bearing-Bypass Testing in Fibre Metal Laminates. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:85dd2d77-7f5f-4a5f-a90c-465b789afd42

Chicago Manual of Style (16^th Edition):

de Haan, Gerardo (author). “Methodology for Bearing-Bypass Testing in Fibre Metal Laminates.” 2018. Masters Thesis, Delft University of Technology. Accessed March 09, 2021. http://resolver.tudelft.nl/uuid:85dd2d77-7f5f-4a5f-a90c-465b789afd42.

MLA Handbook (7^th Edition):

de Haan, Gerardo (author). “Methodology for Bearing-Bypass Testing in Fibre Metal Laminates.” 2018. Web. 09 Mar 2021.

Vancouver:

de Haan G(. Methodology for Bearing-Bypass Testing in Fibre Metal Laminates. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 09]. Available from: http://resolver.tudelft.nl/uuid:85dd2d77-7f5f-4a5f-a90c-465b789afd42.

Council of Science Editors:

de Haan G(. Methodology for Bearing-Bypass Testing in Fibre Metal Laminates. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:85dd2d77-7f5f-4a5f-a90c-465b789afd42

Virginia Tech

20. Swanson, Erik Evan. Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings.

Degree: PhD, Mechanical Engineering, 1998, Virginia Tech

URL: http://hdl.handle.net/10919/30727

► Hydrodynamic journal bearings are applied in a wide range of both old and new, advanced rotating machinery designs. To maintain existing machinery, as well as… (more)

Subjects/Keywords: Hydrodynamic; Bearing; Experimental; Journal Bearing

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APA (6^th Edition):

Swanson, E. E. (1998). Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/30727

Chicago Manual of Style (16^th Edition):

Swanson, Erik Evan. “Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings.” 1998. Doctoral Dissertation, Virginia Tech. Accessed March 09, 2021. http://hdl.handle.net/10919/30727.

MLA Handbook (7^th Edition):

Swanson, Erik Evan. “Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings.” 1998. Web. 09 Mar 2021.

Vancouver:

Swanson EE. Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings. [Internet] [Doctoral dissertation]. Virginia Tech; 1998. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/10919/30727.

Council of Science Editors:

Swanson EE. Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings. [Doctoral Dissertation]. Virginia Tech; 1998. Available from: http://hdl.handle.net/10919/30727

Texas A&M University

21. Mertz, David Hunter. Lift-off performance in flexure pivot pad and hybrid bearings.

Degree: MS, Mechanical Engineering, 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-3197

► Three flexure pivot pad bearings (FPBs) with different preloads are evaluated for use in high performance applications by comparing them to a hybrid hydrostatic bearing… (more)

Subjects/Keywords: Lift off; bearing; lubrication; hydrodynamic bearing; hydrostatic bearing; turbopump

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APA (6^th Edition):

Mertz, D. H. (2009). Lift-off performance in flexure pivot pad and hybrid bearings. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-3197

Chicago Manual of Style (16^th Edition):

Mertz, David Hunter. “Lift-off performance in flexure pivot pad and hybrid bearings.” 2009. Masters Thesis, Texas A&M University. Accessed March 09, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-3197.

MLA Handbook (7^th Edition):

Mertz, David Hunter. “Lift-off performance in flexure pivot pad and hybrid bearings.” 2009. Web. 09 Mar 2021.

Vancouver:

Mertz DH. Lift-off performance in flexure pivot pad and hybrid bearings. [Internet] [Masters thesis]. Texas A&M University; 2009. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3197.

Council of Science Editors:

Mertz DH. Lift-off performance in flexure pivot pad and hybrid bearings. [Masters Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-3197

Texas A&M University

22. Chirathadam, Thomas. Metal Mesh Foil Bearings: Prediction and Measurement for Static and Dynamic Performance Characteristics.

Degree: PhD, Mechanical Engineering, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148301

► Gas bearings in oil-free micro-turbomachinery for process gas applications and for power generation (< 400 kW) must offer adequate load capacity and thermal stability, reliable… (more)

▼ Gas bearings in oil-free micro-turbomachinery for process gas applications and for power generation (< 400 kW) must offer adequate load capacity and thermal stability, reliable rotordynamic performance at high speeds and temperatures, low power losses and minimal maintenance costs. The metal mesh foil bearing (MMFB) is a promising foil bearing technology offering inexpensive manufacturing cost, large inherent material energy dissipation mechanism, and custom-tailored stiffness and damping properties. This dissertation presents predictions and measurements of the dynamic forced performance of various high speed and high temperature MMFBs. MMFB forced performance depends mainly on its elastic support structure, consisting of arcuate metal mesh pads and a smooth top foil. The analysis models the top foil as a 2D finite element (FE) shell supported uniformly by a metal mesh under-layer. The solution of the structural FE model coupled with a gas film model, governed by the Reynolds equation, delivers the pressure distribution over the top foil and thus the load reaction. A perturbation analysis further renders the dynamic stiffness and damping coefficients for the bearing. The static and dynamic performance predictions are validated against limited published experimental data. A one-to-one comparison of the static and dynamic forced performance characteristics of a MMFB against a Generation I bump foil bearing (BFB) of similar size, with a slenderness ratio L/D=1.04, showcases the comparative performance of MMFB against a commercially available gas foil bearing design. The measurements of rotor lift-off speed and drag friction at start-up and airborne conditions are conducted for rotor speeds up to 70 krpm and under identical specific loads (W/LD =0.06 to 0.26 bar). The dynamic force coefficients of the bearings are estimated, in a ‘floating bearing’ type test rig, while floating atop a journal spinning to speeds as high as 50 krpm and with controlled static loads (22 N) applied in the vertical direction. The parameter identification is conducted in the frequency range of 200-400 Hz first, and then up to 600 Hz using higher load capacity shakers. A finite element rotordynamic program (XLTRC2) models a hollow rotor and two MMFBs supporting it and predict the synchronous rotor response for known imbalances. The predictions agree well with the ambient temperature rotor response measurements. Extensive rotor response measurements and rotor and bearing temperature measurements, with a coil heater warming up to 200 ºC and placed inside the hollow rotor, reveal the importance of adequate thermal management. The database of high speed high temperature performance measurements and the development of a predictive tool will aid in the design and deployment of MMFBs in commercial high-speed turbomachinery. The work presented in the dissertation is a cornerstone for future analytical developments and further testing of practical MMFBs. Advisors/Committee Members: San Andres, Luis (advisor), Palazzolo, Alan (committee member), Kim, Yong-Joe (committee member), Barroso, Luciana (committee member).

Subjects/Keywords: Loss factor; Damping; Stiffness; Bearing parameter identification; Rotordynamics; GFB; Gas foil bearing; MMFB; Metal mesh foil bearing

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APA (6^th Edition):

Chirathadam, T. (2012). Metal Mesh Foil Bearings: Prediction and Measurement for Static and Dynamic Performance Characteristics. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148301

Chicago Manual of Style (16^th Edition):

Chirathadam, Thomas. “Metal Mesh Foil Bearings: Prediction and Measurement for Static and Dynamic Performance Characteristics.” 2012. Doctoral Dissertation, Texas A&M University. Accessed March 09, 2021. http://hdl.handle.net/1969.1/148301.

MLA Handbook (7^th Edition):

Chirathadam, Thomas. “Metal Mesh Foil Bearings: Prediction and Measurement for Static and Dynamic Performance Characteristics.” 2012. Web. 09 Mar 2021.

Vancouver:

Chirathadam T. Metal Mesh Foil Bearings: Prediction and Measurement for Static and Dynamic Performance Characteristics. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/1969.1/148301.

Council of Science Editors:

Chirathadam T. Metal Mesh Foil Bearings: Prediction and Measurement for Static and Dynamic Performance Characteristics. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148301

University of Waterloo

23. Hasanzadeh Ghafari, Shahab. A Fault Diagnosis System for Rotary Machinery Supported by Rolling Element Bearings.

Degree: 2007, University of Waterloo

URL: http://hdl.handle.net/10012/3280

► The failure of rolling element bearings is one of the foremost causes of breakdown in rotary machinery. So far, a variety of vibration-based techniques have… (more)

▼ The failure of rolling element bearings is one of the foremost causes of breakdown in rotary machinery. So far, a variety of vibration-based techniques have been developed to monitor the condition of bearings; however, the role of vibration behavior is rarely considered in the proposed techniques. This thesis presents an analytical study of a healthy rotor-bearing system to gain an understanding of the different categories of bearing vibration. In this study, a two degree-of-freedom model is employed, where the contacts between the rolling elements and races are considered to be nonlinear springs. The analytical investigations confirm that the nature of the inner ring oscillation depends on the internal clearance. A fault-free bearing with a small backlash exhibits periodic behavior; however, bearings categorized as having normal clearance oscillate chaotically. The results from the numerical simulations agree with those from the experiments confirming bearing’s chaotic response at various rotational speeds. Bearing faults generate periodic impacts which affect the chaotic behavior. This effect manifests itself in the phase plane, Poincare map, and chaotic quantifiers such as the Lyapunov exponent, correlation dimension, and information entropy. These quantifiers serve as useful indices for detecting bearing defects. To compare the sensitivity and robustness of chaotic indices with those of well-accepted fault detection techniques, a comprehensive investigation is conducted. The test results demonstrate that the Correlation Dimension (CD), Normalized Information Entropy (NIE), and a proposed time-frequency index, the Maximum Approximate Coefficient of Wavelet transform (MACW), are the most reliable fault indicators. A neuro-fuzzy diagnosis system is then developed, where the strength of the aforementioned indices are integrated to provide a more robust assessment of a bearing’s health condition. Moreover, a prognosis scheme, based on the Adaptive Neuro Fuzzy Inference System (ANFIS), in combination with a set of logical rules, is proposed for estimating the next state of a bearing’s condition. Experimental results confirm the viability of forecasting health condition under different speeds and loads.

Subjects/Keywords: Bearing diagnosis; Bearing prognosis; Bearing vibration; Chaotic vibration

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APA (6^th Edition):

Hasanzadeh Ghafari, S. (2007). A Fault Diagnosis System for Rotary Machinery Supported by Rolling Element Bearings. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/3280

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hasanzadeh Ghafari, Shahab. “A Fault Diagnosis System for Rotary Machinery Supported by Rolling Element Bearings.” 2007. Thesis, University of Waterloo. Accessed March 09, 2021. http://hdl.handle.net/10012/3280.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hasanzadeh Ghafari, Shahab. “A Fault Diagnosis System for Rotary Machinery Supported by Rolling Element Bearings.” 2007. Web. 09 Mar 2021.

Vancouver:

Hasanzadeh Ghafari S. A Fault Diagnosis System for Rotary Machinery Supported by Rolling Element Bearings. [Internet] [Thesis]. University of Waterloo; 2007. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/10012/3280.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hasanzadeh Ghafari S. A Fault Diagnosis System for Rotary Machinery Supported by Rolling Element Bearings. [Thesis]. University of Waterloo; 2007. Available from: http://hdl.handle.net/10012/3280

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queensland University of Technology

24. Sharma, Subhash Chandra. Wear reducing additives for lubricants containing solid contaminants.

Degree: 2008, Queensland University of Technology

URL: https://eprints.qut.edu.au/20661/

► Machines operating in dusty environments, such as mining and civil works, are prone to premature failure, leading to production losses. To address this problem, this… (more)

▼ Machines operating in dusty environments, such as mining and civil works, are prone to premature failure, leading to production losses. To address this problem, this research project examines the interaction between solid contaminants and the bearing micro-geometry, in lubricated surface contacts. In particular, it seeks to identify anti-wear additives that are effective in reducing wear under abrasive conditions, making machine elements more dirt tolerant. In general, the influence of antiwear additive is so small that it is difficult to isolate it. Manufactures often make claims about their antiwear products, which are difficult to verify. Hence, there is a need to characterising the antiwear additives available with a well-defined parameter, making it easier for consumers to compare the efficacy of various additives, and be able to select the most suitable additive for a given environment. Effect of micro-geometry parameters such as radial clearance, out-of-roughness and surface roughness was examined and a Film Shape Factor (FSF) – also termed gamma ratio – has been proposed for ensuring adequate separation of journal bearings operating in hydrodynamic lubrication regime, where the out-of-roundness values are higher than the surface roughness values. In this research, an experimental study has been conducted on journal bearings, to examine the influence of five antiwear additives on the bearing wear and micro-geometry. The test additives were provided by the industry partner without revealing their chemical identity or composition; however, these included some of the most commonly used antiwear additives. The tests were performed under three conditions: pure base oil, base oil containing contaminants, and base oil containing contaminants treated with five different additives. The experiments were aimed at choosing one wear measuring technique that evaluates the performance of an individual additive reliably, and based on this technique the additives were characterised. To achieve these objectives, a multi-wear parameter approach (MWPA) was developed, which employed three main wear measurement methodologies, i.e. weight loss, micro-geometry and particle counts –to examine the effect of the antiwear additives. Minimum oil film thickness was also measured to study the lubrication status in the bearing contacts. The MWPA helped in comparing different wear measuring methods, and in selecting the most reliable one. This approach also helped in developing short duration wear tests, thereby saving time, while still getting reliable results without repeating these. Wear experiments were performed on seven sets of bronze bearings and steel sleeve shafts. The test contaminant was 16 micron Aluminium oxide Al2O3 powder mixed in oil with 4% concentration by weight. These solid contaminants were treated with five different antiwear additives to study their influence on the bearings. Bearings were operated such that the minimum oil film thickness in the bearing was equal to the size of the contaminants. These tests…

Subjects/Keywords: journal bearing; contaminants; antiwear additives; worn journal bearings; bearing metrology; hydrodynamic lubrication; sliding bearing wear; micro-geometry; specific film thickness

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APA (6^th Edition):

Sharma, S. C. (2008). Wear reducing additives for lubricants containing solid contaminants. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/20661/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sharma, Subhash Chandra. “Wear reducing additives for lubricants containing solid contaminants.” 2008. Thesis, Queensland University of Technology. Accessed March 09, 2021. https://eprints.qut.edu.au/20661/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sharma, Subhash Chandra. “Wear reducing additives for lubricants containing solid contaminants.” 2008. Web. 09 Mar 2021.

Vancouver:

Sharma SC. Wear reducing additives for lubricants containing solid contaminants. [Internet] [Thesis]. Queensland University of Technology; 2008. [cited 2021 Mar 09]. Available from: https://eprints.qut.edu.au/20661/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sharma SC. Wear reducing additives for lubricants containing solid contaminants. [Thesis]. Queensland University of Technology; 2008. Available from: https://eprints.qut.edu.au/20661/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Zambia

25. Chongo, Charity. Husbands' and Wives' Perspectives on provision of support during pregnancy and labour in Mufulira District .

Degree: 2013, University of Zambia

URL: http://hdl.handle.net/123456789/2044

► Since the Movement for Multi-Party Democracy came into power in Zambia, women's health concerns have been discussed in many fora and they are yet to… (more)

▼ Since the Movement for Multi-Party Democracy came into power in Zambia, women's health concerns have been discussed in many fora and they are yet to evolve into key policy issues. One of the issues in vogue relates to pregnancy and labour and child birth and it is believed that husbands have a cardinal role to play in supporting their spouses throughout pregnancy and during labour. The purpose of the study was to explore the husbands' and wives' perspectives on provision of support during pregnancy and labour in order to encourage their participation with the view of improving maternal health. A cross sectional descriptive study was carried out in Mufulira District. A purposive sample of 34 married expectant mothers aged 20 to 50 years participated in four focus group discussions. The focus group discussions were conducted at clinic 1 and clinic 3 in Kantashi Township. A probability sample of 385 married men aged 20 to 54 years who participated were selected using systematic sampling from the six randomly selected residential areas in Kantashi Township. The men were interviewed face to face interview using questionnaire. The qualitative data was collected by focus group discussions between 2 May 2007 and 6* June 2007. The four focus group discussions were recorded on a tape recorder. The field notes and transcribed interviews were written and divided into subheadings and themes. This was then deposited into appropriate categories of research issues. The information was used to formulate a standardised structure questionnaire for the husbands.Quantitative data was collected using the standardised structure questionnaire through face to face interviews. Trained research assistants were used. Pilot test was done in the third week of June 2007. Data was collected from first week of August to first week of October 2007. Data from the field was cleaned and analysed using computer soft ware SPSS versions 11.0. The main findings of the study were: the expectant women reported that they want their husbands to be present at home more often, to have more time to laugh together and prepare for the baby together and also to help with some house work. They also shared that they would want to have financial support that would help them have enough food and meet the stipulated requirements at the health centres. Most women reported that they would want their husbands to be present during labour, however; they had reservations on the husband being present during childbirth. The husbands on the other hand reported that they always frequently (69.6%) take time to attend to the daily needs of their wives at home. The supportive behaviours that husbands exhibited were being faithful to their wives (97.1%), maintaining their wives morale (96.6%) and emphasizing behaviour according to professional advice given at the clinic by health care professionals (97.1%). However, the supportive behaviour that was least provided was helping with house work (28.6%)). The men reported that they were doing more for their wives at home (98.7%)). The…

Subjects/Keywords: Pregnancy; Labour and Child Bearing- Zambia

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APA (6^th Edition):

Chongo, C. (2013). Husbands' and Wives' Perspectives on provision of support during pregnancy and labour in Mufulira District . (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/2044

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chongo, Charity. “Husbands' and Wives' Perspectives on provision of support during pregnancy and labour in Mufulira District .” 2013. Thesis, University of Zambia. Accessed March 09, 2021. http://hdl.handle.net/123456789/2044.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chongo, Charity. “Husbands' and Wives' Perspectives on provision of support during pregnancy and labour in Mufulira District .” 2013. Web. 09 Mar 2021.

Vancouver:

Chongo C. Husbands' and Wives' Perspectives on provision of support during pregnancy and labour in Mufulira District . [Internet] [Thesis]. University of Zambia; 2013. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/123456789/2044.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chongo C. Husbands' and Wives' Perspectives on provision of support during pregnancy and labour in Mufulira District . [Thesis]. University of Zambia; 2013. Available from: http://hdl.handle.net/123456789/2044

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Utah

26. Le, Alvin Yong-been. Pilot investigation of effectiveness of real-time feedback-assisted partial weight bearing.

Degree: MS, Bioengineering, 2015, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4018/rec/1858

► Partial weight bearing promotes bone formation during fracture rehabilitation and can result in a faster recovery period. However, prescribed partial weight bearing load levels are… (more)

▼ Partial weight bearing promotes bone formation during fracture rehabilitation and can result in a faster recovery period. However, prescribed partial weight bearing load levels are often exceeded, which can lead to disjunction. On the other hand, persistent under loading can delay healing. The effects of real-time feedback on a subject's ability to partially weight bear within a target load range is investigated in this experiment. Ten healthy subjects recruited from the University of Utah were trained to partially weight bear 25% of their body weight on one leg. The subjects were shown how to perform 3-point gait on crutches and allowed time to become accustomed with walking on crutches. Subjects were instructed to partially weight bear within a target range of 20-30% of their body weight. Five subjects (Group 1) walked 50 steps without feedback, followed by 50 steps with real-time feedback. The other five subjects (Group 2) walked 50 steps with feedback, followed by 50 steps without feedback. In both groups, the subjects' ability to partially weight bear improved when receiving real-time feedback. The average maximum loads with and without feedback were 24.87 � 2.9 lbs. and 30.03 � 11.5 lbs., respectively. The number of steps within the target load range of 20-30% were counted for each subject. A one-way ANOVA performed on the number of acceptable steps (within 20-30% body weight) of the four test conditions (Group 1/Group 2 and Feedback/No feedback) found the F-ratio = 4.54 and F-crit(3,16) = 2.46, resulting in the rejection of the null hypothesis that all four population means were equal. A paired t-test performed on Group 1, pairing the number of acceptable steps without feedback with the number of acceptable steps with feedback, showed a significant statistical difference between the steps with and without feedback (P=0.0165). This indicates feedback significantly affected the subject's ability to partially weight bear within the target load range. A paired t-test was also performed on Group 2; the test showed no significant statistical difference (P=0.0958). This indicates learning occurred during the 50 steps when feedback was present, improving the subject's ability to weight bear without feedback for the next 50 steps. Future work include utilizing the experimental data to power a larger study. Also, many methods of providing real-time feedback to patients are possible and the efficacy of each should be explored. For this study, visual representation of the current load was used as the method of providing feedback. However, other forms of feedback may lead to better patient outcomes and compliance.

Subjects/Keywords: Biofeedback; Partial Weight Bearing; Real Time Feedback

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APA (6^th Edition):

Le, A. Y. (2015). Pilot investigation of effectiveness of real-time feedback-assisted partial weight bearing. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4018/rec/1858

Chicago Manual of Style (16^th Edition):

Le, Alvin Yong-been. “Pilot investigation of effectiveness of real-time feedback-assisted partial weight bearing.” 2015. Masters Thesis, University of Utah. Accessed March 09, 2021. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4018/rec/1858.

MLA Handbook (7^th Edition):

Le, Alvin Yong-been. “Pilot investigation of effectiveness of real-time feedback-assisted partial weight bearing.” 2015. Web. 09 Mar 2021.

Vancouver:

Le AY. Pilot investigation of effectiveness of real-time feedback-assisted partial weight bearing. [Internet] [Masters thesis]. University of Utah; 2015. [cited 2021 Mar 09]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4018/rec/1858.

Council of Science Editors:

Le AY. Pilot investigation of effectiveness of real-time feedback-assisted partial weight bearing. [Masters Thesis]. University of Utah; 2015. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/4018/rec/1858

Rochester Institute of Technology

27. Sridhar, Rahulram. Electromechanical actuator bearing fault detection using empirically extracted features.

Degree: Mechanical Engineering, 2012, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/5930

► Model parameter estimation when coupled with Principal Component Analysis (PCA) and Bayesian classification techniques form a potentially effective fault detection scheme for Electromechanical Actuators (EMAs).… (more)

▼ Model parameter estimation when coupled with Principal Component Analysis (PCA) and Bayesian classification techniques form a potentially effective fault detection scheme for Electromechanical Actuators (EMAs). This work uses parameter estimation algorithms based on linear system identification methods, derives a novel feature extraction algorithm based on PCA and analyzes its performance through simulations and experiments. A Bayesian classifier is used to create well defined EMA health classes from the extracted features. Research contributions on fault detection in EMAs are significant because EMA faults and their detection are not yet well understood. Potential future applications - such as in primary flight control actuation in aircraft - require that quality fault detection systems be in place. Therefore, fault detection of EMAs is a vast area of ongoing research where highly capable solutions are gradually becoming available. Prior work in parameter estimation methods for feature extraction in DC motor drives - which includes EMAs - are amongst those available. While PCA is a popular feature extraction solution in a number of frequency-based fault detection approaches, the use of PCA for feature extraction from model parameters for detecting bearing faults in EMAs has not been previously reported. In this work, a linear difference model is applied to the EMA system data such that fault information is distributed amongst the estimated model parameters. A direct comparison of the parameter estimates from healthy and degraded systems offers little insight into health conditions because of the weak effects of faults on the signal data. However, the application of PCA to uncorrelate the linearly correlated model parameters while minimizing the loss of variance information from the data effectively brings out fault information. The present algorithm is successfully applied to data collected from a Moog MaxForce EMA. The results are consistent and display effective fault detection characteristics, making the developed approach a suitable starting point for future work. Advisors/Committee Members: Kolodziej, Jason.

Subjects/Keywords: Actuator; Bearing; Detection; Electromechanical; Fault; Feature

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APA (6^th Edition):

Sridhar, R. (2012). Electromechanical actuator bearing fault detection using empirically extracted features. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5930

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sridhar, Rahulram. “Electromechanical actuator bearing fault detection using empirically extracted features.” 2012. Thesis, Rochester Institute of Technology. Accessed March 09, 2021. https://scholarworks.rit.edu/theses/5930.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sridhar, Rahulram. “Electromechanical actuator bearing fault detection using empirically extracted features.” 2012. Web. 09 Mar 2021.

Vancouver:

Sridhar R. Electromechanical actuator bearing fault detection using empirically extracted features. [Internet] [Thesis]. Rochester Institute of Technology; 2012. [cited 2021 Mar 09]. Available from: https://scholarworks.rit.edu/theses/5930.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sridhar R. Electromechanical actuator bearing fault detection using empirically extracted features. [Thesis]. Rochester Institute of Technology; 2012. Available from: https://scholarworks.rit.edu/theses/5930

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Rochester Institute of Technology

28. Holzenkamp, Markus. Modeling and condition monitoring of fully floating reciprocating compressor main bearings using data driven classification.

Degree: Mechanical Engineering, 2013, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/5932

► Condition monitoring reduces maintenance costs on industrial machinery by reducing downtime and allowing for need-based maintenance instead of schedule-based maintenance. Currently, condition monitoring is… (more)

▼ Condition monitoring reduces maintenance costs on industrial machinery by reducing downtime and allowing for need-based maintenance instead of schedule-based maintenance. Currently, condition monitoring is not as widely applied on reciprocating compressors as compared to rotating compressors. However, research for monitoring various components of reciprocating compressors such as inlet and outlet valves and piston rings is conducted. There is industry interest into expanding this research to the main bearings of the compressor. Previous research on bearings focuses on either rolling element bearings or traditional journal bearings with not much information available on low speed applications of fully floating ring journal bearings as are studied in this work. The following work shows a detailed derivation of the forces acting on the main bearings during normal compressor operation based on kinematic relations and dynamic equivalence. The bearing is simulated using an adaptation of the mobility method for fully floating ring bearings found in previous research. It involves solving two simultaneous mobility calculations along with the ring speed to link the inner to the outer bearing. Experimental data of the crankshaft orbit is collected for comparison to the simulation. Condition monitoring for three different fault types is investigated through seeded fault testing: Varying lubricant viscosity, oil feed hole obstruction, and grooves in the bearing land. Principle component analysis has been shown previously to be a successful method of feature selection for classification. This is applied to several sensors and the classification results are compared. A single axis position measurement of the crankshaft shows the most promising results compared to a traditional accelerometer on the bearing housing and a novel accelerometer on the crankshaft. The single axis measurement provides a cost efficient alternative method to the two axis orbit measurement typically used for traditional journal bearings. Advisors/Committee Members: Kolodziej, Jason.

Subjects/Keywords: Classification; Condition monitoring; Journal bearing; Modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Holzenkamp, M. (2013). Modeling and condition monitoring of fully floating reciprocating compressor main bearings using data driven classification. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5932

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Holzenkamp, Markus. “Modeling and condition monitoring of fully floating reciprocating compressor main bearings using data driven classification.” 2013. Thesis, Rochester Institute of Technology. Accessed March 09, 2021. https://scholarworks.rit.edu/theses/5932.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Holzenkamp, Markus. “Modeling and condition monitoring of fully floating reciprocating compressor main bearings using data driven classification.” 2013. Web. 09 Mar 2021.

Vancouver:

Holzenkamp M. Modeling and condition monitoring of fully floating reciprocating compressor main bearings using data driven classification. [Internet] [Thesis]. Rochester Institute of Technology; 2013. [cited 2021 Mar 09]. Available from: https://scholarworks.rit.edu/theses/5932.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Holzenkamp M. Modeling and condition monitoring of fully floating reciprocating compressor main bearings using data driven classification. [Thesis]. Rochester Institute of Technology; 2013. Available from: https://scholarworks.rit.edu/theses/5932

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Mississippi State University

29. Grewal, Harpreet Singh. FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP.

Degree: MS, Mechanical Engineering, 2009, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;

► In order to produce crack free metal powder compacts, the critical region of failure should be detected, so that the particular region can be strengthened… (more)

Subjects/Keywords: PM; Bearing Cap

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Grewal, H. S. (2009). FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;

Chicago Manual of Style (16^th Edition):

Grewal, Harpreet Singh. “FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP.” 2009. Masters Thesis, Mississippi State University. Accessed March 09, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;.

MLA Handbook (7^th Edition):

Grewal, Harpreet Singh. “FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP.” 2009. Web. 09 Mar 2021.

Vancouver:

Grewal HS. FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP. [Internet] [Masters thesis]. Mississippi State University; 2009. [cited 2021 Mar 09]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;.

Council of Science Editors:

Grewal HS. FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP. [Masters Thesis]. Mississippi State University; 2009. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;

Sardar Patel University

30. Shukla, Snehalkumar Dineshchandra. Rough bearing lubricated with magnetic fluid; -.

Degree: Mathematics, 2013, Sardar Patel University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/34808

None

Bibliography p.166-187

Advisors/Committee Members: Deheri, G M.

Subjects/Keywords: bearing; magnetic fluid

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Shukla, S. D. (2013). Rough bearing lubricated with magnetic fluid; -. (Thesis). Sardar Patel University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/34808

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shukla, Snehalkumar Dineshchandra. “Rough bearing lubricated with magnetic fluid; -.” 2013. Thesis, Sardar Patel University. Accessed March 09, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/34808.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shukla, Snehalkumar Dineshchandra. “Rough bearing lubricated with magnetic fluid; -.” 2013. Web. 09 Mar 2021.

Vancouver:

Shukla SD. Rough bearing lubricated with magnetic fluid; -. [Internet] [Thesis]. Sardar Patel University; 2013. [cited 2021 Mar 09]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/34808.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shukla SD. Rough bearing lubricated with magnetic fluid; -. [Thesis]. Sardar Patel University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/34808

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations