Accession Number:

ADA030701

Title:

Powered Wheels in the Turned Mode Operating on Yielding Soils

Descriptive Note:

Final rept.

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s):

Report Date:

1976-09-01

Pagination or Media Count:

195.0

Abstract:

This report summarizes research concerned with the performance of single, pneumatic-tired, powered wheels operating in the turned mode and the formulation of the findings with analytical relations and dynamical equations for predicting the performance of four wheeled vehicles operating on soft soils and negotiating a flat horizontal turn under ideal steady-state motion. Seventy-two single pass tests were conducted in the laboratory on a near saturated clay and an air-dry sand with a 6.00-9 tire. Wheel turn angles were 0, 5, 10, 15, and 20 degrees vertical wheel loads varied from 1000 to 4000 N and tire deflections were 0.15, 0.25, and 0.35 of the undeflected tire section height. The clay was processed and placed at a soft consistency having a cone penetration resistance of 290 kPa. Relative density of the air-dry sand ranged from loose to medium with corresponding cone penetration gradients of 2.0 and 3. 2 MPam. Performance of the powered wheel was expressed in terms of pull force coefficient, side force coefficient, required input torque coefficient, sinkage coefficient, and wheel slip as influenced by the following independent variables soil strength, tire deflection and geometry, wheel load, and wheel turn angle.

Subject Categories:

  • Surface Transportation and Equipment
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE