Grunt is a structure-born noise caused by resonance of the steering gear torsion bar (T-bar) in an HPAS (Hydraulic Power Assist Steering) system. The goal of this work was to develop techniques to quantify and predict grunt in a RV (rotary valve) steering gear system. First, vehicle testing was used to identify an objective metric for grunt: y = dynamic pressure in the return line. Then, a computer simulation was developed to predict y as a function of two known control factors. The simulation results were correlated to measurements on a test vehicle. Finally, the simulation was expanded to include two additional control factors, and grunt predictions were demonstrated on a different test vehicle.


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    Title :

    Steering Grunt Noise Robustness Improvement


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2009 Noise and Vibration Conference and Exhibition ; 2009



    Publication date :

    2009-05-19




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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