Transverse Vibration Analysis Of Piezoelectric Beam Of Feed Suspension

With the rapid development of science and technology and the continuous consumption of non-renewable energy, the energy issues become a hot topic in the automotive industry. The development of new energy vehicles and automobile energy saving and emission reduction technology is becoming a research focus in the automotive industry. A new suspension to collect the vibration energy has gradually attracted people’s attention. With the demand of the piezoelectric feed suspension can meet the basic function of the suspension, a higher energy recovery efficiency is desired for the suspension, that is, a higher electromechanical conversion efficiency is desired. The piezoelectric beam is the energy conversion component of the piezoelect ric energy- feed suspension. The energy conversion efficiency of piezoelectric vibrator seriously affects the energy conversion efficiency of the suspension. In this paper, the transverse vibration characteristics of piezoelectric vibrator is studied, which provides a theoretical basis for the design of the piezoelectric energy-feed suspension.Taking MATLAB software as calculation tool, the natural frequency and vibration mode of the piezoelectric beam is analyzed by the energy method and the continuous method; the natural frequency and vibration mode of the piezoelectric beam is analyzed by ANSYS finite element method. The type of piezoelectric beam analyzed including fixed hinged piezoelectric beam without attached mass block, fixed hinged piezoelectric beam with attached mass block, cantilever piezoelectric beam with attached mass block. According to the analysis, the energy method and the continuous method and the ANSYS finite element method obtained the consistent result.By the energy method, the influence of the length, width and thickness of the piezoelectric beam on the natural frequency of the piezoelectric beam is analyzed, and the influence of the position and thickness of the attached mass block on the natural frequency of the piezoelectric beam is analyzed. According to the results of the analysis, the length and thickness of the piezoelectric beam has a great influence on the natural frequency of the beam, and the width of the beam has a little influence on the natural frequency of the beam. When the ratio of the thickness of the piezoelectric layer and the total thickness is 0.8, the natural frequency of the piezoelectric beam is small. The natural frequencies of attached mass block fixed hinge piezoelectric beam are affected by the mass block parameters, and the influence law is related to the vibration mode of the piezoelectric beam.In this paper, the displacement and strain response of the fixed hinge piezoelectric beam under the displacement excitation are derived by the time dependent bound ary condition method. Based on the time dependent boundary condition method, the influence of the parameters on the displacement and strain response of the piezoelectric beam is analyzed, and the influence of the excitation frequency on the displacement and strain response of the piezoelectric beam is analyzed. According to the analysis, when the excitation frequency is taken as the natural frequency value of each step, the number of the maximum of the response is related to the number of the natural frequency.In this paper, the voltage response of multi set of piezoelectric beams with different sizes was measured by bench test, and the experimental results were compared with the results obtained from theoretical methods. The results show that the experimental and theoretical methods are in agreement. The three methods are effective and accurate vibration analysis methods.