NONLINEAR ANALYSIS OF FLUID SUSPENSIONS FOR TRACKED AIR CUSHION VEHICLES

This paper deals with the nonlinear modeling of vehicle air cushion suspensions in heave mode. Comparisons are made with the small perturbation linearized models to determine the range of input disturbances, and cushion configurations for which the linear model provides a valid approximation to the nonlinear cushion model. The fluid cushion model includes inherent nonlinear effects associated with the feeding duct capacitance, square-law inlet area orifice characteristics, the flexible base cushion capacitance, and the pressure-flow characteristics of the compressed fluid source. The study of nonlinear model in the heave mode minimizes the complexities introduced by the angular, pitch and yaw motions of the vehicle and this emphasizes the inherent dynamics of the fluid suspension. Suspension performance characteristics is presented for transient guideway and external force (e.g., wind gust) inputs to both linear and nonlinear cushion models. Large guideway inputs of the order of 100 percent of the equilibrium gap height and step external force input up to 25 percent of the equilibrium value are applied to several configurations with equilibrium operating gaps of 0.125-05 in. and suspension natural frequencies of 0.5 to 2 hz. Influence of parametric variations on dynamic performance of nonlinear suspensions is discussed.

  • Corporate Authors:

    International Society for Terrain-Vehicle Systems

    Box 4824, Duke Station
    Durham, NC  United States  27706

    Planning Transport Associates, Incorporated

    P.O. Box 4824, Duke Station
    Durham, NC  United States  27706
  • Authors:
    • Garg, D P
  • Publication Date: 1975-3

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Filing Info

  • Accession Number: 00097715
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM