共查询到19条相似文献,搜索用时 140 毫秒
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基于电流与电压复合控制的压电陶瓷驱动器 总被引:1,自引:0,他引:1
针对电压控制型压电陶瓷驱动器存在动态性能差的问题,及电流控制型压电陶瓷驱动器存在在静态下易充电饱和、难以获得稳定输出的问题,该文设计了基于电流与电压控制的复合型压电陶瓷驱动器.该驱动器具有电流电压双闭环反馈,使驱动器可兼具良好的静态和动态特性.在此基础上,分析了复合型驱动器的性能特点和各参数对其性能的影响,通过调整参数可改变驱动器性能,以满足不同需求.实验结果表明,该驱动器驱动行程为10 μm的压电陶瓷时,0~100 V阶跃信号响应时间小于400 μs,满行程带宽可达1.5 kHz,给定直流信号下可获得良好的稳定输出. 相似文献
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由于压电型电液伺服阀的阀芯采用两个对顶压电驱动器驱动,且压电驱动器固有的迟滞非线性,使两压电驱动器的输出具有很强的耦合作用,不能同步,从而使阀芯的运动速度、精度和平稳性降低。采用单纯的PID控制可以在一定程度上实现解耦控制,但其控制精度较低。提出了一种基于DRNN网络整定的PID控制器,它根据DRNN网络辨识的被控对象的Jacobian信息,在线调整PID控制器的比例、积分和微分参数,从而使DRNN网络整定的PID控制器很好地实现了阀芯的解耦同步控制。实验结果表明DRNN网络整定PID控制的综合性能优于常规PID控制。 相似文献
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压电驱动器迟滞特性的Preisach模型研究 总被引:15,自引:2,他引:13
压电驱动器的迟滞特性是影响其位移输出精度的主要因素。该文采用改进的Preisach模型对压电驱动器的迟滞特性进行建模,并进行了相应的实验研究。实验结果表明该模型可以很好地预测压电驱动器在经过一定的控制电压序列以后的位移输出值.能够有效地降低迟滞特性对压电驱动器位移输出精度的影响。 相似文献
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压电陶瓷材料电学性能参数测量研究 总被引:3,自引:0,他引:3
从双层压电梁在电场作用下的位移响应与电场的关系式出发,借助于试验数据逆推导出压电陶瓷材料的电学性能参数。位移响应的试验数据采用非接触激光测振仪得到。该文方法相对压电参数测量的静态法、动态线路传输法和动态电容法减少了许多中间测量环节和等效处理手段,且易于具体实施,相对于动态位移法又有更好的精度,为压电陶瓷类材料电学性能参数测量提供了一种全新的测量方法。 相似文献
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为提高压电微夹钳操作的灵活性,省掉用于检测其位移的外部传感器,该文设计了一种新型的四自由度压电微夹钳,并采用自感知方法获得其钳指位移。首先,基于两组空间垂直交叉的横向逆压电效应,设计了在夹持方向和垂直夹持方向上同时运动的四自由度压电微夹钳新结构;其次,基于压电晶片在电压作用下发生变形的同时在其表面产生电荷的思想,提出了电荷积分的自感知方法获取压电微夹钳的钳指位移;最后,通过实验测试了压电微夹钳的静动态特性及位移自感知特性。实验结果表明,基于自感知方法获得的位移与基于传感器获得的结果具有较好的一致性。 相似文献
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压电致动器双向电源研究 总被引:8,自引:3,他引:5
提出并研究了一种压电致动器电源,它可以实现对压电致动器的从负电压到正电压的双向电压作用,且作用电压可以很高并可不间断连续作用。该电源具有易于实现压电致动器输出自动控制和输出范围大的特点,适宜逆压电效应为基本原理的压电器件在以静态位移输出为主要目的的场合应用。文中论述和分析了这种电源的工作原理和电路实现方法,推导出理论计算公式,并给出了实验结论与应用情况。 相似文献
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《Mechatronics》2023
To improve the operational flexibility of the piezoelectric microgripper, a new four-degree-of-freedom piezoelectric microgripper was designed and fabricated. The clamp fingers can move both along the clamping direction and along its vertical direction. Also, clamping experiments were conducted on a φ 300 μm × 20 mm micro-shaft. Based on the transverse inverse piezoelectric effect of two groups of vertical intersections, a new configuration of a four-degree-of-freedom piezoelectric micro-gripper is designed. It can produce micro-displacement along the clamping direction and vertical clamping direction simultaneously. According to the Euler-Bernoulli beam equation, the Lagrangian function method and Hamilton variational principle are used to model the four-degree-of-freedom piezoelectric micro-gripper. Then, based on the optimization of the geometric parameters of the fingers, the static and dynamic characteristics of the microgripper are analyzed by the finite element method. After that, the micro-gripper is made using lithography, gluing, and laser cutting. Finally, the piezoelectric microgripper's static and dynamic characteristics and the micro-shaft's clamping operation are tested by experiments. The experimental results show that the maximum displacement, response time, and natural frequency of the designed micro-gripper along and perpendicular to the clamping direction agree well with the finite element simulation. The designed microgripper exhibits a promising prospect in practical micromanipulation applications. 相似文献
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Schuder John C. Raines Gary K. Stephenson Hugh E. MacKenzie James W. 《IEEE transactions on bio-medical engineering》1968,(1):24-33
The present paper is concerned with an evaluation of a piezoelectric energy conversion system in which two columns of piezoelectric ceramic disks are excited axially by means of thin metallic shims stacked alternately with the disks. Mechanical energy output is extracted through the expansion and contraction of the Columns. The treatment is based upon the equivalent circuit approach first suggested by Mason. A lever system is used in making the mechanical impedance transformation between the very high force and small displacement of the piezoelectric columns and the low force and relatively large displacement required for an artificial heart. The role of mass loading in improving the power capability and efficiency of the energy converter is clearly indicated. It is concluded that the theoretical energy output per unit mass of material per cycle and the efficiency of conversion are such as to justify a continued developmental effort. 相似文献