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.

Report Date:

1995-06-01

Pagination or Media Count:

171.0

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