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You searched for subject:(roller slip). Showing records 1 – 3 of 3 total matches.

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Brno University of Technology

1. Černohous, Josef. Polohovací zařízení radaru: Track point of radar.

Degree: 2019, Brno University of Technology

Diploma thesis concerns in the first part about current knowledge in the field of electromagnetic waves, the history, development and distribution of radar, radar antenna types and distribution of structure radars. The second part deals with the problem formulation and analysis. The third part defines the specific goals of diplomas thesis and the fourth part proposes a solution methode. Design and design selection is included in fifth part. The sixth section analyze selected variant and describes its components. Final seventh part contains design assessment of structural, technological and economic aspect. Advisors/Committee Members: Prokeš, František (advisor), Veselý, Oldřich (referee).

Subjects/Keywords: Radar; radiolokátor; elektromagnetické vlnění; servomotor; kroužkový sběrač; koncový spínač; kuželíkové ložisko; Radar; electromagnetic wave; servodrive; slip ring; limit switch; tapered roller bearing

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APA (6th Edition):

Černohous, J. (2019). Polohovací zařízení radaru: Track point of radar. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/16358

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

Chicago Manual of Style (16th Edition):

Černohous, Josef. “Polohovací zařízení radaru: Track point of radar.” 2019. Thesis, Brno University of Technology. Accessed September 26, 2020. http://hdl.handle.net/11012/16358.

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

MLA Handbook (7th Edition):

Černohous, Josef. “Polohovací zařízení radaru: Track point of radar.” 2019. Web. 26 Sep 2020.

Vancouver:

Černohous J. Polohovací zařízení radaru: Track point of radar. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2020 Sep 26]. Available from: http://hdl.handle.net/11012/16358.

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

Council of Science Editors:

Černohous J. Polohovací zařízení radaru: Track point of radar. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/16358

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


Northeastern University

2. Yang, Hankang. Lateral dynamics of an axially translating medium: a theoretical and experimental study on the effects of guiding components.

Degree: PhD, Department of Mechanical and Industrial Engineering, 2016, Northeastern University

By 2020, the average of data stored for each person will reach 5,200 GB. This will put increased demands on cost and reliability of data storage. Compared to its competitors, tape storage technology is more energy efficient and operates at lower cost, with longer media life, hence improved reliability. Nevertheless, there are market and technology pressures to improve all aspects of tape recording. One of the key factors that influence tape storage density is the drive's ability to follow written data tracks. Lateral tape motion (LTM) which can be described as a deviation of the tape from its prescribed, linear path could cause the read/write heads to lose track of the data and lead to lower reliability. LTM is caused by periodic and non-periodic effects. All of the guiding elements, including rollers, stationary guides, read/write head assemblies, and packing reels present rich sources of dynamic effects due to friction, sliding contacts, impulses, and damping effects due to air bearing/entrainment.; The research presented in this thesis is motived by the need to understand the causes of LTM, in order to help increase the volumetric storage density of magnetic tape storage systems. To this end tape is modeled as tensioned, axially moving beam with viscoelasticity. Two major studies were undertaken to investigate the effects of imperfections in roller geometry, and dynamic friction between the tape and a grooved roller. In addition, the effects of periodic impulses, such as those that could develop due to flange contacts, on tape dynamics were investigated. A new model for the coupling between lateral and longitudinal tape vibrations was also presented.; Accuracy of Numerical Solution: All of the models presented in this work were solved numerically, by using the finite element method in spatial and the Newmark's method in temporal dimension. A comprehensive study of the convergence characteristics of the numerical methods was carried out. The numerical and analytical dispersion relations (DR) were compared, in order to measure the accuracy of the fully discretized direct solution method. The waveguide-finite element (WFE) method was used to find the DR for the finite element solution. Good agreement was found between the numerical and analytical solution. Effects of using finite difference discretization in space were also investigated. For the system under study, it was found that high frequency behavior can be simulated with high accuracy by using the finite element discretization, at a relatively modest computational cost.; Eigenvalue Analysis: In this work we also introduce a way to carryout eigenvalue analysis of gyroscopic systems by using the finite element discretization. It was shown that the results match the classical work. This method was used to find the natural frequencies of the system with internal damping.; Roller Mechanics: A mechanics based model to describe the lateral positioning of a tape over a tilted roller is introduced. It is shown that this condition requires the slope of the neutral axis…

Subjects/Keywords: lateral tape motion; magnetic tape storage; nonlinear mechanics; roller tribology; stick and slip motion; wave characterization; Magnetic recorders and recording; Heads; Magnetic tapes; Roller bearings; Damping (Mechanics); Friction; Mathematical models; Tribology; Nonlinear mechanics

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

APA (6th Edition):

Yang, H. (2016). Lateral dynamics of an axially translating medium: a theoretical and experimental study on the effects of guiding components. (Doctoral Dissertation). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20200525

Chicago Manual of Style (16th Edition):

Yang, Hankang. “Lateral dynamics of an axially translating medium: a theoretical and experimental study on the effects of guiding components.” 2016. Doctoral Dissertation, Northeastern University. Accessed September 26, 2020. http://hdl.handle.net/2047/D20200525.

MLA Handbook (7th Edition):

Yang, Hankang. “Lateral dynamics of an axially translating medium: a theoretical and experimental study on the effects of guiding components.” 2016. Web. 26 Sep 2020.

Vancouver:

Yang H. Lateral dynamics of an axially translating medium: a theoretical and experimental study on the effects of guiding components. [Internet] [Doctoral dissertation]. Northeastern University; 2016. [cited 2020 Sep 26]. Available from: http://hdl.handle.net/2047/D20200525.

Council of Science Editors:

Yang H. Lateral dynamics of an axially translating medium: a theoretical and experimental study on the effects of guiding components. [Doctoral Dissertation]. Northeastern University; 2016. Available from: http://hdl.handle.net/2047/D20200525

3. Alakhramsing, Shivam Sharwien. Towards a fundamental understanding of the tribological behaviour of cam-roller follower contacts.

Degree: 2019, University of Twente

Cam-roller followers are part of the valve train mechanisms found in internal combustion engines. Valve train friction losses may contribute up to 10% of the total engine friction losses. The lubricated cam-roller follower unit consists of two lubricated contacts, namely the cam-roller contact and roller-pin contact. While the former is a non-conformal contact, the latter is a conformal contact. The traction induced by the cam-roller contact drives the roller. It is important to study friction between the cam and roller as it influences the engine efficiency and the onset of wear – and thus ultimately lifetime – of components. Understanding lubrication conditions in the cam-roller contact is complicated due to transient variations of the geometry, force and friction in the roller-pin contact. A very important variable, affecting the cam-roller lubrication performance, is the frictional force (which resists the motion of the roller) at the roller-pin contact. The lubricated cam-roller contact studied in this thesis is highly loaded with contact forces up to 16 kN. Important lubrication performance indicators of the cam-roller contact are the pressure, film thickness and frictional force. This thesis focuses on the factors influencing the aforementioned lubrication performance indicators. Relying on the aforementioned, the factors studied in this work are: •The influence of axial shape of the roller: The axial shape of the roller and its influence on the generated film thickness, pressure and friction in the cam-roller contact. This was done by means of a smooth surface finite element method (FEM)-based finite line contact elastohydrodynamic lubrication (EHL) model. The model shows the effects of parameters describing the axial shape of the roller, velocity, load and material properties on the lubrication performance indicators. •The influence of elastic deformation in the roller-pin contact: In order to better quantify the friction, film thickness and pressure in the roller-pin contact a similar smooth surface FEM-based EHL model was developed for the roller-pin contact. The model demonstrates the importance of allowing for elastic deformation of the conformal roller-pin contact and its effect on film thickness, pressure and friction coefficient. •The influence of roller-pin contact friction in the high slide-to-roll ratio (SRR) domain of the cam-roller contact: At increasing levels of friction in the roller-pin contact the amount of sliding at the cam-roller contact increases, in turn affecting the film thickness, pressure and cam-roller contact friction coefficient. In order to analyse the effects of higher values of roller-pin friction coefficient on the cam-roller lubrication performance, an infinite line contact mixed-thermo-elastohydrodynamic (TEHL) model was developed for the cam-roller contact. The mixed-lubrication model is based on the load-sharing concept and uses real surface roughness measurement data as input. The complete model is based on a smooth surface FEM-based EHL line contact model and a boundary… Advisors/Committee Members: de Rooij, Matthias B., Schipper, Dirk J..

Subjects/Keywords: Elastohydrodynamic lubrication; cam-roller; roller-pin; mixed-lubrication; roller slip; asperity contact; Friction; Stick-slip; slide-to-roll ratio; Finite Element Analysis; thermohydrodynamic; thermo-elastohydrodynamic; Finite line contacts; logarithmic rollers; coating

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

APA (6th Edition):

Alakhramsing, S. S. (2019). Towards a fundamental understanding of the tribological behaviour of cam-roller follower contacts. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; 3ea78a51-f232-480d-80e3-5a27294d2f45 ; 10.3990/1.9789036546669 ; urn:isbn:978-90-365-4666-9 ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html

Chicago Manual of Style (16th Edition):

Alakhramsing, Shivam Sharwien. “Towards a fundamental understanding of the tribological behaviour of cam-roller follower contacts.” 2019. Doctoral Dissertation, University of Twente. Accessed September 26, 2020. https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; 3ea78a51-f232-480d-80e3-5a27294d2f45 ; 10.3990/1.9789036546669 ; urn:isbn:978-90-365-4666-9 ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html.

MLA Handbook (7th Edition):

Alakhramsing, Shivam Sharwien. “Towards a fundamental understanding of the tribological behaviour of cam-roller follower contacts.” 2019. Web. 26 Sep 2020.

Vancouver:

Alakhramsing SS. Towards a fundamental understanding of the tribological behaviour of cam-roller follower contacts. [Internet] [Doctoral dissertation]. University of Twente; 2019. [cited 2020 Sep 26]. Available from: https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; 3ea78a51-f232-480d-80e3-5a27294d2f45 ; 10.3990/1.9789036546669 ; urn:isbn:978-90-365-4666-9 ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html.

Council of Science Editors:

Alakhramsing SS. Towards a fundamental understanding of the tribological behaviour of cam-roller follower contacts. [Doctoral Dissertation]. University of Twente; 2019. Available from: https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; 3ea78a51-f232-480d-80e3-5a27294d2f45 ; 10.3990/1.9789036546669 ; urn:isbn:978-90-365-4666-9 ; urn:nbn:nl:ui:28-3ea78a51-f232-480d-80e3-5a27294d2f45 ; https://research.utwente.nl/en/publications/towards-a-fundamental-understanding-of-the-tribological-behaviour-of-camroller-follower-contacts(3ea78a51-f232-480d-80e3-5a27294d2f45).html

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