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Vibratory power flow through a nonlinear path into a resonant receiver

T. J. Royston, R. Singh
1997 Journal of the Acoustical Society of America  
Vibratory power flow through a nonlinear path into a resonant receiver is considered via a specific vibration isolation example case, the automotive hydraulic engine mount. System equations for the source-nonlinear path-receiver system are developed based on prior experimental and analytical studies. For periodic excitation, an efficient solution method is formulated for the calculation of the steady-state stable response using a multi-term harmonic balance approach with condensation and
more » ... ensation and continuation. In this computational study it is shown that, while modeling the isolation path with a "softened" nonlinear expression may only moderately alter the predicted system behavior at the excitation harmonic, it can significantly alter it at higher harmonics. Computational studies of multi-harmonic motion and power transmission show that audible structure-borne noise may be generated from subaudio frequency excitations due to path nonlinearities. It is also observed that support base ͑receiver͒ resonances can significantly affect the overall dynamic behavior. For instance, with a multi-degree-of-freedom base model, significant levels of vibratory energy at higher harmonics of the excitation are transmitted through the path, especially when these harmonics coincide with the natural frequencies of the receiver.
doi:10.1121/1.418200 fatcat:bc3pkzcravgbfhqtwd2ktljqvu