The Applied Study Of Mechanical Actuator On Vibration Control Of Ship

A new type of actuator is developed in this paper for the first time in our country, its amplitude and frequency of exciting force can be adjusted on line. It can be used to control the all-around or local vibration of the super structure and deck of ship. The actuator is initiated in our country. The results of experiment show that the actuator has good response with the change of parameters of the actuator and can realize vibration control of structures. The following is the main work of this paper.1. A new type of adjusting eccentricity mechanics is studied in the paper. The problem of line moving of the eccentric mass along the shaft with rotation of the shaft is solved. The principle of the actuator is that two eccentric gyrating mass moving in opposite direction to produce a single direction exciting force by mechanics to counteract the upright vibration of the ship caused by the imbalance moment of the engine. The magnitude of vibration caused by engine and actuator is the same and in opposite direction that its phase angle is 180 degree and the vibration is counteracted.2. Amplitude and frequency exciting force of the actuator developed for the vibration control can be adjusted on line. The sliding mode control synthesis for variable structure is used to meet the track of rotation velocity for the first time according to the characteristic of the actuator. The synthesis solved the problem of eccentric on-line adjusting resulted in the parameter changes. The control synthesis used in the actuator developed in the paper is an innovation.3. The optimize fuzzy control synthesis to identify and adjust phase difference of the exciter and actuator is developed for the first time in the paper. The optimize fuzzy control synthesis can be formed according to the testing results and be linearized in subsection and improved the velocity of adjusting of phase difference compared with the traditional fuzzy control synthesis. The optimize fuzzy control synthesis is an innovation. The super structure and deck of ship are always complicated. It is difficult to establish its dynamics equation. The optimize fuzzy control synthesis developed to solve the problem of vibration control of structure is rational and effective. 4. A new method is developed in the paper to study the vibration of mode deck considered the mass and distributing mass as anisotropy thin plate. The vibration characteristic of the thin plate with the mass and without the mass are discussed in detail in theory. A difference equation is developed for vibration problem in the paper for the first time. The study method is an innovation for the vibration active control of super structure and deck of ship. The study has a theoretical and actual sense for the location of actuator and sensor in the active control of vibration.The exciting force and frequency of the actuator can be adjusted on line. The sliding mode control synthesis and phase control synthesis improve the accuracy of control. The experiment showed that the control effect is stable. The result of phase control is within eight degree. The paper gave a new method for the study of vibration of shell thin plate with lumped and uneven mass in the field of active control of vibration. It has theoretical values for improving the accuracy of control.