多扰源连续隔振器系统的动态特性及综合最优控制

Continuous isolator plays an important role in modern industry and everyday life. Investigation of modeling and dynamics on it is a field full of vigor and vitality. The object of this project is a investigation on dynamics and transmission of power flow in the single stage system, complicated double stage system and package system containing continuous isolator. A new method of modeling and theoretical study of continuous coupled system is put forward to give a way in controlling energy transmission, avoiding resonance and improving isolating effect so as reduce vibration and structure noise in system. Investigation including following aspects:Concept of effective mobility on this condition of continuous coupling is raised. Theory of power low is adopted as a method valuing the isolating effect. Comprehensively considering the coupling of mount in high frequency and basing on the mobility analysis of substructure, the expression of power flow transmission spectrum of finite continuous isolation single stage system of asymmetry is derived. At the same time mathematical calculation and analysis by figure is made to find the law affecting the isolation effect when parameters of system change. It is found that such system is super than corresponding discrete system in whole frequency, while the dampness of continuous isolator isn't a effective parameter in controlling mount's vibration. If the mount's stiffness increases, the power flow input to the mount will decrease which is outstanding in low frequency. .Adopting the coupling between discrete parameter and distribute one and considering the flexibility of middle mount and foundation, the mathematical model is established which can be used such complicated double stage system as raft system and floating floor. Combining the method of substructure mobility and effective mobility system's dynamics and power flow transmission on condition of single exciting source and multiple sources is investigated. The controlling method and the law of the power flow transmission on condition of the coupling of continuous isolator and flexible foundation are revealed while corresponding calculating program is made. System parameter's influence are discussed. Decrease in stiffness of upper and lower isolators will cause a reduction in power flow at whole frequency band while an decrease of their dampness is not effective. Increase in density of middle mount will reduce the power flow so much at low frequency band, while in middle and high frequency the maximum will be changed. The power flow input to foundation will get down as its bending stiffness enhances. The increase of its length will get a raise in input power flow, but the number of peak will get down. At the same time the first peak of the curve of power flow will move. The value of peak will greatly reduce as dampness of foundation increases. Its stiffness' increase will result in a reduction in the power flow into the foundation while the resonant modality will get down and the number of peak of power flow spectrum will get rare. .The theory of continuous isolator in package system has been investigated for ther first time. The interaction among the points of continuously coupling interface is concerned. A model which is more close to practical product is established and the theory of power flow is tried induced into package system which can infect the nature of transmission of power flow much better. Based on the power flow transmission from outer environment to package item, the coupled vibrating property of double stage package system is theoretical studied. The law of energy transmission and controlling method is discovered..It is proposed that to optimize the dynamic parameters of isolators, their disposition, as well as their placement on the flexible foundation will effectively control vibrations in the service frequency band interested. In that power flow input to foundation is adopted as the objective function. Furthermore, an optimum design for the typical example of a floating floor for preparatory motor is suc

针对工程中柔性基础上的安装机器的隔振问题和连续隔振器系统建模理论问题，提出实用的二维连续有限非对称隔振模型应用有效导纳与子结构导纳综合法及功率流理论方法，研究复杂连续隔振支撑系统的动态特性，揭示其能量传递规律，以进行有效预测，并寻求实现复杂柔性耦合结构系统振动与噪声的综合最优控制。.