Abstract:This paper studied a beltdrive system containing a translating belt, two pulleys, accessory systems, and a oneway clutch. The driven pulley and the accessory system were coupled by the oneway clutch. Moreover, the transverse vibration of the translating belt was taken into account. Therefore, the derived coupled discretecontinuous nonlinear equations consist of integropartialdifferential equations and piecewise ordinary differential equations. The continuous nonlinear equations were truncated to a set of nonlinear ordinary differential equations by using the Galerkin method. The steadystate responses of the coupled vibration of the beltdrive system were investigated by the numerical harmonic balance method. Moreover, the effects of the oneway clutch on the power system were studied by comparing the frequencyresponse curve of the translating belt with and without oneway clutch device. The nonlinear dynamic characteristics of the beltdrive system were studied. Furthermore, the steadystate responses of the beltdrive system were investigated at the higher excitation frequency for the first time. In addition, the steadystate responses based on the harmonic balance method were confirmed by the RungeKutta algorithm.