A new method of ground vehicle shock absorber characterization using lumped acceleration excitation was presented. This method treats the shock absorber as a black box and can be used over the entire range of travel for a shock absorber, producing a 27 % larger mapping on the phase plane than traditional harmonic excitation characterization. Force response surfaces were created based on the lumped acceleration data and also based on harmonic excitation data. A difference surface was created between the common regions of both force response surfaces and a ridge was detected at low speeds. The ridge appears to be an effect of abruptly opening or closing the valving in the shock absorber. A correlation was made between the response of the lumped acceleration force response surface to harmonic inputs and observed data which indicates the force response surface slightly underestimates the force. Hysteresis effects were noted using the lumped acceleration force response surrface at low frequencies and it was suggested that a frequency dependence may not exist in shock absorbers. Testing of a wider range of shock absorbers using lumped acceleration excitation was suggested. A standard materials testing machine was used to characterize the shock absorber. The limits of this particular materials testing machine were encountered and if higher velocities are required, a larger capacity machine is recommended. The velocities and accelerations that would be required for more extensive shock absorber characterization are availabe in other standard materials testing machinery.


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    Title :

    Characterizing shock absorbers for ground vehicle simulation


    Additional title:

    Bewertung von Stoßdämpfern für die Fahrzeugsimulation


    Contributors:

    Published in:

    Publication date :

    1995


    Size :

    4 Seiten, 6 Bilder, 9 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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