Volume 23, Issue 4 (July 1995)
Characterizing Shock Absorbers for Ground Vehicle Simulation
A new method of ground vehicle shock absorber characterization using lumped acceleration excitation is presented. By using a triangular waveform and lumping the acceleration at the beginning and end of travel, this method produces a 27% larger mapping on the phase plane than traditional harmonic (sinusoidal waveform) excitation characterization. Force response surfaces are created based on the lumped acceleration and on harmonic excitation data. A difference surface is created between the common regions of both force response surfaces. A correlation is made between the response of the lumped acceleration force response surface to harmonic inputs and observed data. Hysteresis effects are noted using the lumped acceleration force response surface at low frequencies. A standard materials testing machine is used to characterize the shock absorber.