Research On Active Vibration Control And Algorithm Of Small Side Array Sonar Platform

The small side array sonar platform is a kind of cylindrical shell structure based on underwater vehicles such as torpedoes or submarines.This kind of cylindrical shell structure is widely used in the industrial technology field.However,the vibration problems of the shell will affect the performance of the shell itself and the stability of people or equipment inside the shell.In order to solve the vibration control problem of the cylindrical shell,based on the active vibration control strategy,the active vibration control of cylindrical shells is studied in this paper.Firstly,the active vibration control system of piezoelectric structure is introduced at the beginning,then the basic characteristics of piezoelectric materials are introduced,and the actuating sensing principle of piezoelectric actuators and sensors is verified by theoretical derivation of piezoelectric equations.The state expression of the cylindrical shell is derived from the vibration mode theory,and the modal analysis of the shell is carried out through the finite element software,which improves the state equation expression of the control model.Secondly,the layout of actuators on the surface of the cylindrical shell is optimized,and the corresponding optimization objective function is established by selecting the optimization configuration criteria.The PSO algorithm is introduced and the improved PSO algorithm is used to optimize the objective function to obtain the layout positions of different actuators on the cylindrical shell.Then,the active vibration control algorithm is studied.PID controller,fuzzy PID controller and compound disturbance observer is designed respectively for active vibration control simulation,and different control effects and benefits are obtained.Then,the time-delay phenomenon in the feedback control system is studied.An improved adaptive Smith predictor is designed for the simulation of time-delay compensation based on the conventional predictor.Finally,based on the designed composite controller,the active vibration control simulation of cylindrical shell structure is carried out,which verifies the effectiveness of the optimized actuation points,the vibration suppression effect of active vibration control and the good control effect of the designed composite controller;Then,it is verified that different action points have different vibration suppression effects on different modal orders through separate modal control.