Ride control for high speed ground transportation including passenger-seat dynamics and active aerodynamic suspensions : N. S. Nathoo, R. O. Stearman, A. J. Healey and B. G. Shanahan 1976 High Speed Ground Transportation Journal10, 297–315. (19 pages, 10 figures, 11 references)

Abstract

The feasibility of controlling high speed ground transportation systems responses through the use of active suspension systems in the form of lifting surfaces is studied. Aerodynamically, three-dimensional canards are employed to control the pitch and plunge steady-state response of the vehicle and passengers to harmonic guideway excitations. In addition to the model of an air cushion vehicle, a man-seat model is also incorporated into the analysis. Vehicle and passenger response has been studied by assuming various control schemes and a parameter optimization technique. A second method to suppress acceleration levels of the vehicle via optimal control theory has also been investigated. Vehicle response at a speed of 300 miles per hour is compared with railway comfort criteria and the ISO riding comfort standards. Except for the actively controlled cases, all results indicate that an uncomfortable ride would result from the vehicle's response. The proposed actively controlled suspension provides a safe and comfortable passenger environment.