| The traditional piezoelectric learning as an important branch of crystal physics, it studiesthe interacted process of mechanical and electrical, the transition of the energy, it is formed arelatively complete theoretical system. Piezoelectric effect reacts the coupling between theelastic properties of the crystal and dielectric properties. The piezoelectric element is applied incivil, mechanical, aviation. Piezoelectric ceramic transducer (PZT) depends on the goodpiezoelectric property, dielectric property, the range of application of piezoelectric becamelarger.This topic reference a large number of documents. The paper has the comparison andanalysis for the characteristic parameters of different piezoelectric ceramic material, at the sametime, a lot of pertinent information for this paper. The object for the analysis of vibrationcharacteristics are tri-layers piezoelectric laminates. The piezoelectric laminates have thesubstrate plate for steel in middle layer, the piezoelectric ceramics plate in up-down layer. Thepiezoelectric layers and the substrate are coupled together. The piezoelectric layers produce thepolarization, and produce the stress and strain with the substrate. Extracting the vibration modeand natural frequency of piezoelectric laminates, the same step natural frequency for thepiezoelectric layer of PZT4is higher than PZT5A. These verify that PZT4are the variations ofparameters of piezoelectric ceramics, PZT5A are the receiving of parameters of piezoelectricceramics. Sinusoidal voltages are effected on the piezoelectric laminates, the vibration responsecharacteristics are concluded by changing the long, wide, thickness of the piezoelectric layersand the substrate. It is also concluded that the effect of the vibration response for thepiezoelectric laminated plate. In other words, the more thinner the piezoelectric layers are, themore thick the substrate is, the more obvious the actuating effects are. The effects for vibrationresponse are concluded by changing the excitation, in the other words, with the externalexcitation voltage is increased, the displacement responses and the Mises stress responses areimproved significantly of the piezoelectric laminated plate. The best actuated voltage is200Vaccording to the vibration response and the material properties. This topic choose three kinds of sizes of space steel frame. The comparison study of thevibration mode and natural frequency, The higher is stiffness of rigid frame, The lower is samestep natural frequency, and analysis of natural frequency of the piezoelectric element in thespace rigid frame with put through the contrast or not, the research shows that the naturalfrequencies increase0.4%~8.8%after paste the piezoelectric patches on the space rigid frame.Study on the law of affecting the natural character after piezoelectric patches coupled with spacerigid frame. Compared and analysis of the actuating effect for the two sizes piezoelectricpatches on the space rigid frame. The research shows that the actuating effects are more obviousfor piezoelectric patches of15mm×15mm×2mm. The range and degree of the actuating effectsare more profound than piezoelectric patches of7mm×7mm×2mm.Finally, combining with piezoelectric effect, Attaching two kinds of piezoelectric patcheson the space rigid frame with injuries or not. The displacements for space rigid frame withinjuries are one time bigger than space rigid frame with no injuries. With the actuating analysisafter building the finite element model, the change of the displacements for the space rigidframe is not obviously, but the meaning of the compare the displacements between space rigidframe with injuries and space rigid frame with no injuries. At the same time, this conclusionreaches the imagine and train of thought with the actuating analysis that bases on the effect ofpiezoelectric to the study of theoretical method for the structure damage identification... |
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