Dynamic Response Characteristics of the Urban Gravity-Vacuum Transit System

[+] Author and Article Information
W. C. Caywood, George Dailey

The Johns Hopkins University, Applied Physics Laboratory, Silver Spring, Md.

J. Eng. Ind 92(3), 524-528 (Aug 01, 1970) (5 pages) doi:10.1115/1.3427797 History: Received July 28, 1969; Online July 15, 2010


The accelerations and displacements felt by a passenger aboard a high-speed train will, in part, be determined by the response of the train and guideway to irregularities in the guideway. For the Gravity-Vacuum-Transit (GVT) System, computer programs have been written for the dynamic response of the system to sinusoidal track disturbances. Some results have also been obtained for the response of the train to any shape irregularity in track surface. The analytical models range from a simple unsprung mass moving along a rigid track to a complete train of N-cars with suspension springs and dampers moving along a flexible track-tube structure which is itself suspended by springs and dampers from a rigid tunnel wall. Numerical results have been obtained which identify and evaluate some of the major constraints of the system. It is felt that the analytical techniques as well as some of the results have general application to the ride comfort evaluation of high-speed transportation systems.

Copyright © 1970 by ASME
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