Research Of Active Vibration Reduction Based On Force-adjustable Mechanical Actuator

In application of active vibration reduction theory, control theory, computer technique and signal processing technique, employing a force-adjustable mechanical actuator, the active control for stern deck vibration is investigated in this thesis, and some progress has been made.The elementary theory of active vibration attenuation is illustrated systematically; the mathematical models for active vibration reduction are also developed. Analysis of the vibration characteristics of stern deck is carried out. The experimental rig for active vibration control is further completed.A novel searching phase strategy is proposed for the first time, namely, prime number searching approach: It is shown from the numerical results that good control effect can be derived by using such strategy.It is the first time that QMAC kinetic controller is combined with AC servo system; the combined control of the phase and amplitude are realized by writing VB kinetic program. The force-adjustable mechanical actuator is consisted of a couple of imbalance mass blocks rotating towards opposite directions. Then a sine force of single freedom can be used to attenuate the vibration produced by the source to a lower level, maybe to zero.Based on experimental rig for active vibration reduction, by mean of phase and eccentricity analytical algorithm, a series of simulation of active vibration reduction are performed. Combined with the practical situation of control system and force-adjustable mechanical actuator, the active vibration reduction experiments are conducted on the rig. The results from the simulation and experiment both show that the phase and eccentricity algorithm are feasible; they have better practicability and accuracy.