An automobile with high performance suspension, wheels and tires installed experienced moderate to severe steering wheel shake at road speeds of 55, 65 and 90 mph. Modal testing and structural modification analyses were performed using a mini-computer based spectral analyzer. The results of these test and analyses indicated that both the frame crossmember, onto which the steering rack was bolted, and the transmission mount bracket required stiffening. Installation of stiffened components on the automobile significantly alleviated steering wheel shake.
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