Study On The Energy Harvesting And Vibrate Performance Of A Piezohydraulic Damper

In order to harvest low frequency, large amplitude vibration energy, a piezoelectric material and a fluid coupling piezohydraulic damper was proposed. The regular of the energy harvesting performance and vibrating characteristic were studied both theoretically and experimentally. The main contents are as follows:The piezoelectric vibrator of the piezohydraulic damper was analyzed. Under given a uniform force, the influence of the circular double-crystal piezoelectric vibrator natural frequency and maximum displacement were obtained at different radius. The vibration modes under different boundary conditions was studied. The influence of different radius ratio, thickness ratio and the metal substrate material to the output performance of the circular piezoelectric vibrator was studied. The results show that when other conditions are determined, there is an optimal size of the radius, the radius ratio, the ratio of the thickness, the metal substrate material to make the piezohydraulic damper to achieve its best performance.The dynamic model of piezohydraulic damper was established and numerical simulation analyzed. The piezohydraulic damper generation performance and vibrate performance of the quality of the mass, the excitation frequency, system back pressure especially the added mass is studied in different medium. The simulation results show that when other conditions were determined, there is an optimal mass quality, system back pressure, size of damper aperture to make the piezohydraulic damper to achieve its best performance. The methods to improved energy harvesting device power generation performance and vibration control performance have been obtained.To verify the simulation analysis results, the piezohydraulic damper prototype and the test system platform was built. The energy harvesting performance and vibrating characteristic was tested under different excitation frequency, mass, system back pressure and different size of damper aperture. The test results show that when other conditions were determined, there is an optimal mass quality, system back pressure to make the piezohydraulic damper to achieve its best performance.