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Steering Grunt Noise Robustness Improvement
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 19, 2009 by SAE International in United States
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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.
CitationMcWilliams, J., Bleitz, D., and Wei, J., "Steering Grunt Noise Robustness Improvement," SAE Technical Paper 2009-01-2095, 2009, https://doi.org/10.4271/2009-01-2095.
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