The Complexity Of Multi-source Inspired Vibration Power Flow Characteristics

Vibrational power flow approach is a very important track for analysis of vibration and noise & vibration control of complex structure, which considering both strength and rapidity, and the conclusion is emphasis for engineering application.With the fast development of machine industry, the coupling between structures is more and more complex, and excitations on structures become more and more complicated, the theoretical investigation of complex structures by complicated excitations looks more and more important. Nowadays, series of excellence are obtained from the research of vibration and noise control. Comparatively, the research by complicated excitations is slower.Based on lots of references, a number of investigations among model establishment, theoretical analysis and numerical simulation are developed. Firstly, the advantages and shortages of vibration and noise controlling methods are concluded. Secondly, the influences of simple oscillator parameters on transmitted power flow are analyzed under complex excitations. Thirdly, the oscillator model of multi-layer vibration isolation system is established, and the effect of system parameters to vibration transmission is analyzed by using mobility power flow. Fourthly, the oscillator model of floating raft system is established, and the effect of system parameters to vibration transmission is also analyzed under different excitations. Fifthly, the effect of flexibility of floating raft to the system vibration isolation is considered based on common floating raft. The significance for the vibration control of complex structures under complicated excitations is offered in this thesis.