Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"creepage"”.
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Analytical Evaluation of the Accuracy of Roller Rig Data for Studying Creepage in Rail Vehicles
… Johnson and Vermeulen's theory, the effects of creepage, scale, and load on the creep force correction factor are demonstrated. �It is shown that INRETS' scaling strategy causes the normalized creep curve to be identical for both a full-size and a scaled roller rig. �It is also shown that …
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Effect of Wheel and Rail Conditions on Contact Dynamics and Mechanics
… positions, angles of attack, cant angles, and creepages that commonly occur in a train. It features a quarter-scale wheel with various profiles. First, the focus was on understanding how grease and leaves reduce traction at the wheel-rail interface (WRI). The test results indicate that even …
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Accurate Wheel-rail Dynamic Measurement using a Scaled Roller Rig
… the wheels, and therefore their relative slip or creepage. The Rig benefits from a novel force measurement system, suitable for steel on steel contact, to precisely measure the contact forces and moments at the wheel-rail contact. Experimental studies are conducted on the VT ��" FRA Roller Rig …
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A Statistical Approach to Modeling Wheel-Rail Contact Dynamics
… to be an alternative to the classical traction-creepage models that have been available for decades. Various experiments are conducted in different settings on the VT-FRA Roller Rig at the Center for Vehicle Systems and Safety at Virginia Tech to study the relationship between the traction …
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The vibration of rolling discs
… the effect of the contact stiffness and the creepage forces which may be present and simple contact models are proposed and corresponding responses predicted. Possible various sources of excitation are examined which cover the Rigid Body dynamics of the rolling disc, the effect of the contact …
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Investigation into the Design of High-Power Plug-In Shipboard Electrical Connectors
… requirements, especially those surrounding creepage distance, are presented for high-power contacts across a range of voltages. Additional Navy specific insulation requirements are identified and related to the impact on a high-power connector. Constraints on both electrical contact and …
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State of the Art Roller Rig for Precise Evaluation of Wheel-Rail Contact Mechanics and Dynamics
… the wheels, and therefore their relative slip or creepage. A novel force measurement system, suitable for steel on steel contact, is configured to precisely measure the contact forces and moments at the contact patch. The control architecture is developed based on the SynqNet data acquisition …
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Design and Development of Force Control and Automation System for the VT-FRA Roller Rig
… and performance at various load, speed, and creepage conditions. The results indicate that the controller is able to reduce the standard deviation of vertical force fluctuations at the wheel-rail contact by a factor of four. In terms of power of the vertical force fluctuations, this …
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Electromechanical Design and Development of the Virginia Tech Roller Rig Testing Facility for Wheel-rail Contact Mechanics and Dynamics
… the system. The VT Roller Rig can control the creepage within 0.3RPM of the commanded value, while actively controlling the relative position of the rotating bodies with an unprecedented level of accuracy, no more than 16nm of the target location. The contact force measurement dynamometers can …
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A Polynomial Chaos Approach for Stochastic Modeling of Dynamic Wheel-Rail Friction
… model accounts for wheel-rail contact, creepage effect, and creep force, among others. Simulations are performed at train speed of 20 m/s for 4 sec using rail roughness as a unique excitation source. The dynamic simulation has been performed for the deterministic model and for the …