Treatment of Frequency-Dependent Complex Stiffness for Commercial Multi-Body Dynamic Analysis Programs*

Vibration isolation components such as rubber bushings or mounts are usually represented by the Voigt model for consideration of their dynamic characteristics in commercial multi-body dynamic analysis programs. The simple Voigt model, however, has limitations in reflecting their frequency-dependent dynamic characteristics. A method, the so-called transfer function model, which can reflect better the frequency-dependent complex stiffness and yet matches well with commercial programs, is suggested. The performance of the proposed technique in dynamic analysis is illustrated for two four-degree-of-freedom systems by comparing the results with those of the Voigt model.