Accession Number : ADA295206

Title :   HEMTT Dynamic Sensitivity to Small Obstacles at Low Velocities. Volume 2. Validation Study Using VEHDYN 3.0.

Descriptive Note : Technical rept. 1 May 92-28 Feb 93,

Corporate Author : ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA

Personal Author(s) : Creighton, Daniel C.

PDF Url : ADA295206

Report Date : 01 JUN 1995

Pagination or Media Count : 171

Abstract : The Vehicle Dynamic Model VEHDYN 3.0, developed at the US Army Engineer Waterways Experiment Station, was used to compare selected displacements, velocities, and accelerations with field-measured quantities for both an empty and a fully loaded M977 HEMTT truck. Test conditions (detailed in Volume 1 of this series) included having the HEMTT negotiate small square-edged obstacles (0.25 -3.00 inches high) at low velocities (1.80 0.06 mph). Time history and Fast Fourier Transform comparisons are provided. The VEHDYN 3.0 model did a reasonable job at predicting the motion, especially the action of the HEMTT walking beam suspensions and overall low-frequency response. A procedure was demonstrated that takes acceleration data from low-amplitude front and rear drop tests and develops linear spring and damper response relationships for the HEMTT. (MM)

Descriptors :   *MOTION, *TRUCKS, *SUSPENSION DEVICES, VELOCITY, COMPUTERIZED SIMULATION, MANEUVERABILITY, PITCH(MOTION), ACCELERATION, DISPLACEMENT, DAMPING, DROP TESTS, FAST FOURIER TRANSFORMS, SPRINGS.

Subject Categories : Surface Transportation and Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE