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首页> 外文会议>Twelfth International Conference on Adaptive Structures and Technologies, Oct 15-17, 2001, University of Maryland >PERFORMANCE MODELING OF A PIEZO-HYDRAULIC ACTUATOR
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PERFORMANCE MODELING OF A PIEZO-HYDRAULIC ACTUATOR

机译：压电液压执行器的性能建模

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摘要

A simple quasi-static model has been developed as an engineering tool for improving the performance of a piezo-hydraulic actuator's fluid system. The model's predictions compare reasonably well with experimental data at low frequencies (< 150 Hz) as trends in the dependence of actuation speed on driving frequency and applied load are captured appropriately. The model indicates that there is an optimum load and driving frequency that corresponds to maximum power output but that the operating conditions for optimum power output and efficiency are different. The efficiency of the fluid system is maximum (100%) at 0 Hz independent of load but decreases with increasing frequency at a rate that depends on the load. Viscous losses through the valves and tubing are negligible compared with the inertial losses associated with accelerating and decelerating the load. This acceleration and deceleration process occurs twice per piezo cycle because of the configuration of the fluid system used to rectify the oscillatory motion of the piezo stack. Accordingly, the inertia of the load dominates the behavior of the device at high frequencies. The performance of the fluid system is most sensitive to the stiffness of the fluid in the pumping chamber, which should be maximized for maximum power output.
机译：已经开发了一种简单的准静态模型作为工程工具，用于改善压电液压执行器的流体系统的性能。该模型的预测与低频（<150 Hz）的实验数据可以很好地比较，因为可以适当地捕捉到驱动速度对驱动频率和施加负载的依赖性趋势。该模型表明存在与最大功率输出相对应的最佳负载和驱动频率，但最佳功率输出和效率的工作条件不同。与负载无关，流体系统的效率在0 Hz时最大（100％），但随着频率的增加而降低，其速率取决于负载。与加速和减速负载相关的惯性损失相比，通过阀门和管道的粘性损失可以忽略不计。由于用于校正压电叠堆的振动运动的流体系统的配置，每个压电周期会发生两次加速和减速过程。因此，负载的惯性支配着高频下的设备性能。流体系统的性能对泵腔中流体的刚度最为敏感，应将其最大化以实现最大功率输出。

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