Design and Control Experiments of Piezoelectric Hydraulic Actuators

压电液压执行器的设计与控制实验

• 批准号: 09650270
• 负责人: KONISHI Katsunobu
• 金额: $ 1.28万
• 依托单位: University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650270/
• 关键词: Piezoelectric Element; Hydraulic Pump; Hydraulic Resonancy; Hydraulic Actuator; Brake-by-Wire System; Disk Brake; Disturbance Observer

In this research, we discussed mathematical models of the piezoelectric pump and its application to the automoble brake system. The piezoelectric pump consists of a multilayered piezoelectric element, a diaphragm, pumping valves, resonant pipes and accumulatos, and the maximum pumpimg power of 62W was obtained in the previous experiments by using the piezoelectric element of 22mm diameter and 55.5mm length. A detailed mathematical model of the pump is derived here by considering the compressibility of the working liquid, nonlinear characteristics of piezoelectric element, the time delay of pumping valves action and so on.The validity of the model was illustrated by comparing the experimental data and the simulation results.Using the mothematical model of the piezoelectric pump, a brake system for automoble disk brake was also simulated in this research. The brake system consists of a piezoelectric pump as a power source, calipers and its piston to generate brake force, and a three position solenoid valve to change the sitsuation of brake. It was shown that 15mm/sec of piston speed and 20kN of piston force were obtained by using the piezoelectric element of 33mm diameter and 55.5mm length. The control strategy of the piston force was also constructed in this research by using the disturbance observer where control input was the driving voltage of the piezoelrctric pump.

本文讨论了压电泵的数学模型及其在汽车制动系统中的应用。该电压泵由多层压电元件、膜片、泵阀、谐振管和蓄能器组成，在之前的实验中，采用直径22mm、长度55.5mm的压电元件，获得了62W的最大泵送功率。考虑工作液的可压缩性、压电元件的非线性特性、泵阀动作的时滞等因素，建立了泵的详细数学模型。通过实验数据与仿真结果的对比，验证了模型的有效性。利用压电泵的数学模型，对汽车盘式制动器的制动系统进行了仿真研究。该制动系统由压电泵作为动力源，卡钳及其活塞产生制动力，三位置电磁阀改变制动情况组成。结果表明，采用直径为33mm、长度为55.5mm的压电元件可获得15mm/sec的活塞速度和20kN的活塞力。采用扰动观测器，以压电泵驱动电压为控制输入，构建了柱塞力的控制策略。