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A general method is described for the application of random vibration techniques to a laboratory road simulation of a road durability schedule as used by Pontiac Motor Div., General Motors Corp. Basic philosophy as well as specific recommendations are given for the design of the procedures in evaluating the parameters influencing the road simulation. Instrumentation and data reduction techniques are discussed with application to a new concept in laboratory road simulation. A three-axis input, hydraulic shaker road simulator is described which duplicates the random road profile in the fatigue testing of a complete vehicle. A road-simulated endurance test can be programmed which can utilize either magnetic tape or programmed random noise command to electrohydraulic shakers. The test program includes recording of the random road inputs to the vehicle suspension, analysis of these inputs by power spectral density and statistical techniques, and duplication of these random inputs with the shaker facility for vehicle structure fatigue test, with analysis of data from the shaker facility to insure that the force inputs from the road simulator are actually as the car sees the inputs as it is being driven on the road.
random vibration, fatigue tests, automobiles, automotive engineering, road tests, laboratories, tests
Camp, J. D.
Test systems engineer, General Motors Corp., Pontiac, Mich.