Application Research Of Piezoceramic In Truss Active Vibration Control

This article is in view of the truss of vibration reduction problem,using apiezoelectric ceramic bar type damper and a complex power transmission organisationtype damper to damp a straight truss,a “”type truss and a plane desktop truss structurefor reducing their target position vibration at a requested vibration limit respectively.Forstraight beam type truss and “”type truss to verify the main vibration reduction is thepurpose, and put forward to using truss’s payload vibration displacement minimum forvibration reduction targets with three method of active vibration reduction LQRmethod,fuzzy-PID,and resistive piezoelectric damping pile of shunt circuit. Simulationresults show that, compared with the LQR method, the fuzzy control method dependsless on accurate model, it is highly intellectual and more suitable for the model that isnot accurate such as large structure; Active control to design the controller, andpiezoelectric pile of viscous damper shunt only external simple circuit componentsresistance can, this in practical application prospects of a good; Two kinds of dampercan be used for both active vibration reduction, and can be used to split type vibrationreduction, but there are complex power transmission institutions of damper shall notapply to directly replace truss pole pieces, and lever type damper shall not apply tobending moment can not be ignored, the structure of two kinds of damper use differentoccasions. This paper’s main contents are as following:First of all: piezoelectric material’s mechanical and electrical coupling equationsaccording to the constitutive equations of piezoelectric pile is deduced, according to thisequation using PZT material to produce the piezoelectric pile of materials, we designrod type piezoelectric damper and complex power transmission institutions ofpiezoelectric viscous damper, and according to the model respectively establishdynamics equations under the truss structure’s coordinate system.Second, set up a straight truss,a “”type truss and a plane desktop truss structureand analyze their modal and frequency response dynamics characteristics. The analysisresults show that large truss main present low frequency, heavy frequency, dense modalcharacteristics, this in practical application to give full consideration.Again, the first application LQR method, to specify the target with a minimumdisplacement for vibration reduction of the index, by using the genetic algorithm to optimize10pole type piezoelectric damper positions, to straight beam type truss and“”type truss for optimal to reduce vibration control. Then the application ofindependent modal method and fuzzy control to straight beam type truss and “”typetruss is active control method. The results show that the fuzzy control dampinght has amore apparent effect.Finally, the last part uses a complex power transmission organization damper withtruss piezoelectric pile called shunt damping to realize vibration reduction, thepiezoelectric damping into the structure of the equivalent damping added to thestructure, take effective load center for observation are nodded, simulation the freevibration damping and the amplitude-frequency characteristics of simple harmonicexcitation, the vibration and impulse response.The simulation results show that resistivepiezoelectric damping instruments have good damping effect.