Measuring and testing – Vehicle chassis – Steering
Patent
1988-12-15
1989-09-05
Levy, Stewart J.
Measuring and testing
Vehicle chassis
Steering
73126, G01L 528
Patent
active
048627372
ABSTRACT:
A vehicle restraint system for testing vehicles has vehicle restraint linkages which couple to a vehicle mounted on a simulated roadway to provide restraint in selected axes and to permit freedom of movement in other axes in a manner that permits the automobile to react as it would when being driven over an actual roadway. The restraint system is made to combine and limit lateral, longitudinal and yaw motions with a minimum effect on the handling properties in other axes of movement. The restraint system includes selective, active servo positioning in the restrained axes so that the position of the vehicle can be maintained so that the vehicle tires are kept within a load support area of the simulated roadway without substantially affecting the vehicle handling properties. The linkages used are operated through actuators that can also be used as passive restraints, that is, providing a spring force to maintain the vehicle in a desired location. The action of the restraint linkages is through the center of gravity of the vehicle. The three restrained axes are decoupled from each other so that the restraint in each axis does not substantially affect the other axes. Precise simulation of effects on a vehicle of a roadway can thus be obtained.
REFERENCES:
patent: 4238954 (1980-12-01), Langer
patent: 4455866 (1984-06-01), Barrigar
A Dynamometer on which the Dynamic Behaviour of a Passenger Car can be Simulated, by Jean Odier, published in Proc Instn Mech Engrs, vol. 186, 1972.
Road-Holding: Braking and Traction, Paper 700367, New York, Society of Automotive Engineers, Inc., 1970.
Indoor Vehicle Braking Simulation: Correlation and Comparison with Road Testing, Paper 730,562, New York: Society of Automotive Engineers, Inc., 1973.
The Road Simulation Rig, Valeo Publisher.
Levy Stewart J.
MTS Systems Corporation
Simons Michele
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