Effects of Terrain Power Spectral Density Shaping and Measurement Interval on a Vehicle Ride Simulation

摘要

A two-dimensional, five-degree-of-freedom, digital computerized, wheeled-vehicle-ride simulation is tested for sensitivity to two parameters: the power spectral density slope of computer-generated, random terrain profiles and the spacing of the discrete profile points. The vehicle ride simulation is exercised over six terrain profiles of different PSD slopes but identical RMS elevations. The simulation is also exercised several times over one basic profile described by samples taken at different measurement intervals. Calculated absorbed power at the vehicle center of gravity is used to compare ride roughness over the different profiles. The vehicle simulation is shown to be extremely sensitive to change in PSD slope. The sensitivity to changes in measurement interval is shown to be dependent on vehicle size and mass. (Author)