The evaluation of ride comfort during vehicle running has depended on subjective judgement by passengers for many years. Results of this evaluation are often affected by the individual situation of every evaluator. It is, therefore, necessary to evaluate with objective judgement according to the physical values. There have been many attempts on quantitative investigations for the subjective evaluation, which is not achieved because of the weighting difference of individual feelings.

In this study, dividing the running status into the stationary and trangent states, quantitative evaluation equations are offered by both the principle and the multiple regression analysis with the measured physical values. Ride comfort is divided into flat and busy ride in the stationary state, and trangent ride comfort is stated as harshness. These evaluation equations are verified by comparing measured data and offered subjective judgement. The result of these quantitative approaches is induced to clarify the design objective for suspension characteristics.
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