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为实现高性能的振动主动控制、振动能量回收以及基于能量回收的自供电半主动振动控制,提出一种压电液压隔振器.基于实际流体的可压缩性,建立了压电液压隔振器的能量回收系统模型并进行了模拟仿真分析,获得了相关要素对发电量的影响规律.结果表明,压电液压隔振器的发电能力随系统背压及液压缸振幅的增加而增加,且存在最佳压电振子直径、厚度以及直径-厚度比使发电量最大.采用Ф60×1.6 mm3单晶压电振子及Ф16×100mm3液压缸制作了试验样机,并以水为工作介质进行了不同频率、背压、激振器振幅条件下的试验测试.试验所获得的压电液压隔振器的最佳工作频率仅为6 Hz,可用于低频振动能量回收.在频率为6 Hz、激振器输入电压为9 V、背压为0.4 MPa时,发电量为2.42 mJ;当其他条件相同,背压为0.4 MPa时的发电量约为无背压时的20倍.
In order to realize high-performance active vibration control, vibration energy recovery and self-powered semi-active vibration control based on energy recovery, a piezoelectric hydraulic isolator is proposed. Based on the actual fluid compressibility, a piezoelectric hydraulic isolator The model of energy recovery system was simulated and analyzed, and the influence of relevant factors on power generation was obtained.The results show that the power generation capacity of piezoelectric hydraulic isolator increases with the increase of system back pressure and hydraulic cylinder amplitude, and exists The best piezoelectric vibrator diameter, thickness and diameter - thickness ratio to generate the largest.Using Ф60 × 1.6 mm3 single crystal piezoelectric vibrator and Ф16 × 100mm3 hydraulic cylinder test prototype was made and the water as the working medium for different frequencies, Back pressure and vibration amplitude of vibration exciter.At the same time, the optimum working frequency of piezoelectric vibration isolator obtained in this experiment is only 6 Hz, which can be used for low-frequency vibration energy recovery.When the frequency is 6 Hz, When the voltage is 9 V and the back pressure is 0.4 MPa, the power generation is 2.42 mJ. When the other conditions are the same, the power generation when the back pressure is 0.4 MPa is about 20 times of that without back pressure.