Active Vibration Isolation System Based On The Energy Point Of View Of Energy Consumption And Control Strategies

The active isolation of vibration generated by a source and transmitted to a receiver through active mounts has received much attention in recent years, also being regarded as an efficient isolation method. With reference to the last category of applications, there are some examples are used successfully, such as aeroplane, car, etc. Through the active isolation provide substantial improvement in performance, most active system are complex and therefore both costly and even less reliable. It is observed that the cost of implementation does not always justify the improvement in dynamic performance in a given design situation. Often the running costs are high due to high energy consumption. It is clear that the issues related with complex and costly actuators, combined with difficult measurement have resulted in relatively less advancement in commercial implementation of active systems. Therefore lies the motivation for systems that can provide the required performance with less expensive actuation. Systems with low energy consumption can fulfill some requirement is also an attractive subject. So it is important to predict energy consumption.The paper presents two active isolation models, one is single excitation source isolation system, another is multiple excitation source isolation system. The modeling of the system is based on a matrix method, which uses mobility or impedance representations of its elements. The power flow transmitted to the base by primary and control excitations is given, the power flow input into the isolating system due to the actuator is also presented. Several control strategies are discussed, their energy consumption are compared, some factors which maybe influence cost is discussed, such as inclination of the suspension, base thickness, symmetric, etc. Numerical results are presented at last. Several conclusions are obtained, which are useful for optimize isolation design, or reduce energy consumption. Pid control strategy is applied into a multiple excitation source isolation system.The paper is supported by the doctor fund project (NO. 02BS065) of ShanDong...