Accession Number : ADA323983

Title :   Joint Tactical Electrical Vehicle, Active Ride Height and Damping Control, Final Report for FY '95: CALSTART System Development Project for Advanced Hybrid Reconnaissance Vehicles.

Descriptive Note : Final Rept.

Corporate Author : CALSTART BURBANK CA

PDF Url : ADA323983

Report Date : 08 APR 1997

Pagination or Media Count : 294

Abstract : The active suspension system developed for this project is based on an active damper for controlling the medium and high speed dynamics involved with vehicle body and wheel motions, and an active ride height system for controlling the low speed body motions. This type of system makes improvements over a passive system by allowing the optimal damping required for differing terrain and vehicle control requirements to be automatically set by the suspension system while the active ride height system controls the vehicle attitude without sacrificing either passenger isolation or handling. This type of system has been shown to be very competitive with fully active systems over a wide range of running conditions with lower cost, lower energy usage and improved failure modes. The vehicle properties of the Joint Tactical Electric Vehicle, which this suspension system will be implemented on, have been determined and are listed in the main body of this report. Parameters for a selection of tires which are used on this and similar vehicles have been determined for a range of tire pressures and other test conditions, some of this data is given in the appendix. Testing was also performed to determine the possibility of determining the tire deflection from tire pressure measurements. It was found that there was a correlation between the tire pressure and tire deflection although the pressure raise was small, on file order of 5 psi. Because of this relatively small pressure raise, there would be difficulties involved in filtering out other changes in pressure from temperature changes and acoustic effects which are of the same order of magnitude as the pressure raise from tire deflection.

Descriptors :   *DAMPING, *GROUND VEHICLES, *SUSPENSION DEVICES, REQUIREMENTS, TEMPERATURE, OPTIMIZATION, LOW COSTS, DYNAMICS, DEFLECTION, ISOLATION, MOTION, PASSIVE SYSTEMS, TERRAIN, ELECTRICAL PROPERTIES, PRESSURE MEASUREMENT, LOW VELOCITY, LOW ENERGY, WHEELS, HYBRID SYSTEMS, ACOUSTICS, TIRES, RANGE(EXTREMES), FAILURE(MECHANICS), HEIGHT, PASSENGERS, ELECTRIC PROPULSION, RECONNAISSANCE AIRCRAFT, ATTITUDE(INCLINATION).

Subject Categories : Surface Transportation and Equipment
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE