Accession Number : ADA293482

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

Descriptive Note : Technical rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB

Personal Author(s) : Creighton, Daniel C. ; Jones, Randolph A.

PDF Url : ADA293482

Report Date : FEB 1995

Pagination or Media Count : 170

Abstract : The Vehicle Dynamic Model (VEHDYN) 3.0, developed at the U.S. 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 Report 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 :   *MANEUVERABILITY, *TRUCKS, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, MOBILITY, PITCH(MOTION), ACCELERATION, DISPLACEMENT, DAMPING, LOW VELOCITY, DROP TESTS, FAST FOURIER TRANSFORMS, SUSPENSION DEVICES, OSCILLATION, SPRINGS, AXLE SHAFTS.

Subject Categories : Surface Transportation and Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE