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How to remove sprung mass pitch motion due to input surface?

  1. Jun 27, 2013 #1
    Hello All,
    I have measured acceleration data from the sprung mass of vehicle, travelling at (almost) constant speed. There are sufficient accelerometers, to allow the sprung mass angular acceleration, in pitch, to be extracted.
    I have detailed profile data describing the excitation surface, which only has roughness along track, and I also have detailed vehicle suspension data (spring force deflection curves, damper force velocity curves).
    I would like to determine the sprung mass pitch frequencies from the measured accelerometer data, and use these to derive an estimate of the sprung mass pitch inertia.
    My derived angular pitch acceleration doesn't exhibit any fundamental frequencies in the range in which I would expect to see the pitch frequencies (ie less than 10 Hz), in fact the psd of the pitch acceleration shows almost constant power for frequencies below about 8 Hz, and the power falls off rapidly at higher freq.
    I think that the pitch acceleration that I am seeing is the sum of the pitch motion on the suspension, and the pitch motion resulting from the surface.
    I would like to be able to remove the pitch motion due to the surface to be left with the pitch motion of the sprung mass on the suspension. I can't see a way of doing that.
    Anyone have any ideas?

  2. jcsd
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