Active Vibration Control Technique For Two-stage Isolation Mounting

Dynamical machinery is one of primary source of vibration on armada. When it works, vibration is transfered to the base and radiated out through the hull. This affects the concealment performance and combat effectiveness of warship. As far as improving the control level of watercraft vibration, especially improving the concealment performance and combat effectiveness of armada, researching the new technique and method which are agreement with ship dynamical equipment has the academic and practical significance. In this paper the technique of active vibration control is researched on the two-stage vibration isolation mounting and hydraulic serve vibration isolating system. The following creative works have been completed:1. As far as the tow-stage vibration isolation mounting with dynamoelectric actuator is concerned, the effect of the selection of the error sensor (displacement, velocity, acceleration) on the force transfer rate of the PID active vibration control system is analysed and on the basis of this the control simulation with Hebb rule on two-stage vibration isolation mounting with the single neural adaptive PID controller is made and the simulation results indicate the method is effective.2. For the first time the direct adaptive neural network control is induced into two-stage vibration isolation mounting and the method of direct adaptive PD neural network is presented.(l)In order to conquer the complexity of controller, the direct adaptive neural network control is induced into active vibration control system and the digital simulation is made on the two-stage isolation mounting. The error channel is replaced with sgn function in this method. The results indicate the theoretical feasibility of the method.(2)The method of direct adaptive PD neural network is initiated which combine merit the neural network and PID control and the digital simulation is made on the two-stage vibration isolation mounting. The results indicate thetheoretical feasibility of the method and PD neural network has quicker learning speed and smaller neural scale than neural network. One new method is provided for active vibration control.3. The two-stage active vibration isolation system is analysed theoretically. Deducing the transfer function of the system, one controller is constructed and it has the wide frequencies isolation performance and zero force transfer rate. The active vibration isolation simulation is made and the results show that the two-stage isolation mounting with the controller constructed using the method mentioned in this paper has perfect isolation property and this provide new way for controller design.4. In order to study active vibration control with hydraulic servo deeply, the theory model of actual two-stage isolation mounting with hydraulic servo is set up. The force transfer rate of the system is deduced by the transfer function analytical method. The computer simulation of active vibration control performance is made for various control parameters and inhere parameters. These provide useful reference for the re-design and control of the active vibration control mounting with hydraulic servo in future.5. For the first time the active vibration experiment is made using direct adaptive neural network controller at China and these results are significative for practical application of this technique. The experiments of active vibration control are made using direct adaptive neural network controller and direct adaptive PD neural network controller on the two-stage isolation mounting, In addition, the experiment of noncollocated vibration control is made using the two mentioned network controller. All experiment results indicate the effectivity of adopted method.