Design And Implementation Of The Mechanical Dynamic Damper Control System

Active vibration control is a new technology of the vibration engineering field and the front project of the vibration control field currently. Studying and designing the new dynamic damper and the control algorithm used in active vibration control is the hot topic at present. In the paper, some aspects based on the active control of ship vibration, such as the structure design of the mechanical dynamic damper, control algorithm and implementation, etc, are thoroughly analyzed and investigated.In the paper, the control methods of ship vibration and the application of the mechanical dynamic damper on ships are reviewed. The relation of the applied position of the secondary force and the energy level of the vibration is thoroughly analyzed for ship structure as a beam with free ends.The dynamic damper is an important element of the active vibration control system. According to the demand of vibration active eliminating technology, the old dynamic damper's structure is improved by installing a electromotor of step in step, which realizes the auto control of the force amplitude. The important characteristic of the actuator is got through experiments, which is that amplitude and phase of the dynamic damper are independent each other when the vibration frequency of the dynamic damper is a constant.This characteristic provided the important theory basis for the design of control system.According to the charatistics of ships structure, the control algorithm with the combination of LMS and self-optimizing is designed, and is emulated through compliing Matlab programme. The results show that the frequency's tracking online is realized well, the good eliminating vibration impact is got, and the algorithm's astringency is very good.The jeep chassis is selected as the controlled object according to the characteristics of ships. The experiments of the active vibration control are carried out. The control algorithm is programmed by the assemble language of TMS320VC33, and realized by the hardware of VC33-DSP. The experimental results show that the good vibration effects is got through applying the improved mechanical dynamic damper and the corresponding control algorithm, which provided the important instructional significance for the application of the mechanical dynamic damper on ships.