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Vibration Control Of Low Stiffness Thin Plate Based On Macro Fiber Composites

Posted on:2022-04-20Degree:MasterType:Thesis
Country:ChinaCandidate:L XieFull Text:PDF
GTID:2492306572463264Subject:Aerospace engineering
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With the development of science and technology,the level of detection technology has been improved rapidly.Now it is easy to identify the ship by identifying the vibration and noise characteristics of the ship.Therefore,the vibration and noise problem of the ship and ship is becoming increasingly important.With the rapid development of piezoelectric composites,the advantages of Macro Fiber Composites have gradually emerged.Because of the remarkable vibration control effect of macro fiber composite materials,the vibration control research based on such materials is rapidly developed.This paper is based on the active vibration control of Macro Fiber Composites(MFC)on the basic structure of ships.Based on the sensing and driving mechanism of MFC,the theoretical analysis,active vibration control simulation,finite element analysis,vibration control experiment and other aspects of the composite structure of MFC and cantilever thin plate are studied.The main research contents are as follows:Firstly,by analyzing the stress and strain distribution equations of the piezoelectric composite beam structure and the reasonably simplified piezoelectric constitutive equation of MFC,the piezoelectric driving moment equation,the axial force equation and the voltage formula between the electrodes of MFC were obtained,and the driving and sensing mechanism of MFC was discussed theoretically.Differential equation of transverse vibration of cantilever thin plate,calculation formula of natural frequency and main mode function are derived.The mechanical properties of MFC and MFC as piezoelectric sensor are analyzed,and the constitutive equation and plane assumption of MFC are preliminarily studied.Secondly,the finite element models of the MFC and the cantilever thin plate were established,and the modal analysis of the cantilever thin plate structure was carried out.Based on the simulation analysis,the sticking position of the MFC was optimized.By using MFC as both a shaker and a controller,the finite element simulation is carried out to verify the control performance of MFC on the cantilever plate.The root of the cantilever thin plate is excited by the shaker,and the parameters of the MFC and the shaker are changed.The control effect of the cantilever thin plate is simulated and calculated.The control performance of the MFC on the cantilever thin plate in the frequency domain and the time domain is compared,and the optimal position and quantity of the MFC are determined.Finally,the vibration control experiment of the thin cantilever plate based on MFC is designed.The single position control and multiple position control of the thin cantilever plate are carried out by using MFC respectively.The optimal control position of the piezoelectric plate paste position is adopted in the simulation results.The vibration response of cantilever thin plate under different frequency excitation is measured experimentally.The experimental results prove the feasibility and effectiveness of active control of structural vibration with MFC.In the control experiment on the root and middle part of the cantilever thin plate,the frequency of the shaker and the piezoelectric plate are the first-order natural frequency of the cantilever thin plate,and the control effect of the terminal amplitude of the cantilever thin plate is the best.
Keywords/Search Tags:MFC, vibration control, constitutive equation, finite element simulation, cantilever thin plate
PDF Full Text Request
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