The amplitude-frequency filtration characteristic which is related to the interface length between an elastic wheel and ground is given in the refe— rence〔l〕.〇n this basis，this paper makes a further investigation. Firstly, the simplified filtration characteristic formula is presented for the conyience of analytic operation. Secondly, the formula which is applicable to calculating the acceleration mean square value of the body is derived under random excitation. Then calculation examples are given and compared with unfiltered calculation results.
