Open Access Theses and Dissertations

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You searched for subject:(coast down test). Showing records 1 – 3 of 3 total matches.

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University of Windsor

1. Jiang, Xian Jian. Real Time Predictive Speed Analysis for High Speed Rail Collision Test.

Degree: MS, Computer Science, 2015, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5441 

In a real train collision test, a train locomotive needs to be propelled on a straight, guided path, to a particular speed, at which time the train locomotive is released to coast down towards a barrier where it is required to crash at a desired speed. The current control of the release speed and location is based on theoretical data and previous experience which leads to less accuracy in the actual crash speed. In this research work, the goal is to make improvements in a typical real train collision test that will help obtain a more accurate crash speed and release location by controlling the force release precisely. The contribution of this research work is to implement a solution to simulate the behavior of the propulsion system, and trigger an algorithm to calculate the required release speed and location more accurately and quickly. Advisors/Committee Members: Wu, Dan.

Subjects/Keywords: coast down; collision test; crash speed; force release; release location; release speed

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

APA (6th Edition):

Jiang, X. J. (2015). Real Time Predictive Speed Analysis for High Speed Rail Collision Test. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5441

Chicago Manual of Style (16th Edition):

Jiang, Xian Jian. “Real Time Predictive Speed Analysis for High Speed Rail Collision Test.” 2015. Masters Thesis, University of Windsor. Accessed January 18, 2021. https://scholar.uwindsor.ca/etd/5441.

MLA Handbook (7th Edition):

Jiang, Xian Jian. “Real Time Predictive Speed Analysis for High Speed Rail Collision Test.” 2015. Web. 18 Jan 2021.

Vancouver:

Jiang XJ. Real Time Predictive Speed Analysis for High Speed Rail Collision Test. [Internet] [Masters thesis]. University of Windsor; 2015. [cited 2021 Jan 18]. Available from: https://scholar.uwindsor.ca/etd/5441.

Council of Science Editors:

Jiang XJ. Real Time Predictive Speed Analysis for High Speed Rail Collision Test. [Masters Thesis]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5441

2. Sim, Kyu-Ho. Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings.

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

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1575 

Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings were performed. First, compliant flexure pivot tilting pad gas bearings with pad radial compliance (CFTPBs) were introduced and designed for high-speed oil-free micro turbomachinery. The pad radial compliance was for accommodation of large rotor growth at high speeds. Parametric studies on pivot offset, preload, and tilting stiffness were performed using non-linear orbit simulations and coast-down simulations for an optimum design. Second, coast-down tests for imbalance response and stability of typical rotor-bearing system with a rigid rotor and two CFTPBs designed from the above design studies were conducted over operating speeds up to 55 krpm. Prediction of synchronous rotordynamic responses was made in terms of critical speed for various imbalance modes by using a rotordynamic analysis software (XLTRC), combined with dynamic force coefficients from the perturbation analysis. For stability analyses, a generalized orbit simulation program was developed considering both the translational and angular rotor motions with two different bearings. Linear stability analyses for the conical vibration mode were also performed by using XLTRC and the perturbation analysis based on the Lund method. Predictions of whirl speed showed good agreement to the tests, but the estimated onset speed of instability appeared lower than the measured instability. Finally, a new thermo-hydrodynamic analysis model of a typical rotor-bearing system with CFTPBs was presented, accompanying linear perturbation analyses to investigate thermal effects on the rotordynamic performance. A numerical procedure was established for solving the generalized Reynolds equation, the 3-D energy equation, and the associated boundary conditions at the pad inlet flow and solid walls (rotor and pad) simultaneously. Parametric studies were conducted on nominal clearance and external load. Nominal clearance showed significant influence on temperature fields, and external load had uneven thermal effects among pads. Case studies with heat flux and temperature boundary conditions on the rotor end surface were performed to simulate various working conditions of the bearing. Large rotor thermal growth due to the high rotor temperature showed noticeable influence on rotordynamic performance by increasing direct stiffness and damping coefficients. Advisors/Committee Members: Kim, Daejong (advisor), Hung, Wayne N.P. (committee member), Morrison, Gerald L. (committee member), Palazzolo, Alan B. (committee member).

Subjects/Keywords: gas bearings; tilting pad bearings; perturbation analysis; orbit simulation; thermohydrodynamic analysis; rotordynamic analysis; stability analysis; coast-down test

…4.3.2 Imbalance Coast-down Test… …52 4.4.1 Stability Coast-down Test… …40 4.2 Nominal clearance and split offset of Bearing Set I for imbalance coast-down tests… …52 4.5 Nominal clearance and split offset of Bearing Set II for stability coast-down… …26 3.7 Coast down simulations of peak-to-peak amplitudes of εX with respect to pad radial… 

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

APA (6th Edition):

Sim, K. (2009). Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1575

Chicago Manual of Style (16th Edition):

Sim, Kyu-Ho. “Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings.” 2009. Doctoral Dissertation, Texas A&M University. Accessed January 18, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-1575.

MLA Handbook (7th Edition):

Sim, Kyu-Ho. “Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings.” 2009. Web. 18 Jan 2021.

Vancouver:

Sim K. Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings. [Internet] [Doctoral dissertation]. Texas A&M University; 2009. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1575.

Council of Science Editors:

Sim K. Rotordynamic and thermal analyses of compliant flexure pivot tilting pad gas bearings. [Doctoral Dissertation]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1575


University of Kansas

3. Weingart, Robert. On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle.

Degree: M.E., Mechanical Engineering, 2015, University of Kansas

URL: http://hdl.handle.net/1808/19383 

This thesis is about the validation of a computational fluid dynamics simulation of a ground vehicle by means of a low-budget coast-down test. The vehicle is built to the standards of the 2014 Formula SAE rules. It is equipped with large wings in the front and rear of the car; the vertical loads on the tires are measured by specifically calibrated shock potentiometers. The coast-down test was performed on a runway of a local airport and is used to determine vehicle specific coefficients such as drag, downforce, aerodynamic balance, and rolling resistance for different aerodynamic setups. The test results are then compared to the respective simulated results. The drag deviates about 5% from the simulated to the measured results. The downforce numbers show a deviation up to 18% respectively. Moreover, a sensitivity analysis of inlet velocities, ride heights, and pitch angles was performed with the help of the computational simulation. Advisors/Committee Members: Sorem, Robert M (advisor), Tenpas, Peter W (cmtemember), Zheng, Zhongquan (Charlie) (cmtemember).

Subjects/Keywords: Mechanical engineering; Aerospace engineering; Analysis; CFD-Simulation; Coast-Down Test; External Aerodynamics; FSAE; Validation

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

APA (6th Edition):

Weingart, R. (2015). On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle. (Masters Thesis). University of Kansas. Retrieved from http://hdl.handle.net/1808/19383

Chicago Manual of Style (16th Edition):

Weingart, Robert. “On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle.” 2015. Masters Thesis, University of Kansas. Accessed January 18, 2021. http://hdl.handle.net/1808/19383.

MLA Handbook (7th Edition):

Weingart, Robert. “On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle.” 2015. Web. 18 Jan 2021.

Vancouver:

Weingart R. On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle. [Internet] [Masters thesis]. University of Kansas; 2015. [cited 2021 Jan 18]. Available from: http://hdl.handle.net/1808/19383.

Council of Science Editors:

Weingart R. On-Track Testing as a Validation Method of Computational Fluid Dynamic Simulations of a Formula SAE Vehicle. [Masters Thesis]. University of Kansas; 2015. Available from: http://hdl.handle.net/1808/19383

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