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首页> 外文会议>Conference on Active Materials: Behavior and Mechanics Mar 3-6, 2003 San Diego, California, USA >Characterization of Loaded Pre-stressed Piezoelectric Actuators
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Characterization of Loaded Pre-stressed Piezoelectric Actuators

机译：加载预应力压电执行器的特性

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摘要

Over the past few years, actuators have been characterized and analyzed under several different boundary conditions. One of these conditions is loading, which plays a critical part in any application where the actuator is used in a structure. This study concentrated on comparing the displacement under load for different types of actuators of the same length and width, but having different layer compositions. The same load and excitation frequency was used at different voltages. Eleven different groups of devices were tested with metal thickness ratios (MTR - ratio of metal thickness to the total thickness) varying between 0.3 and 0.44. The metals used were stainless steel and brass. The results indicated that the devices with an MTR between 0.31 and 0.37 were able to lift a load of 76 grams. All the devices with this MTR had a ceramic thickness of 0.38mm and stainless steel or brass backing. It was also observed that the positive and negative peak displacements were equal for most devices except for the devices with a metal to PZT thickness ratio of 1 showing a negative peak displacement more than 65% higher than positive peak displacement. This may be due to differences in location of the neutral axis, distribution of pre-stresses, and deformations of the devices under load. It was found that the maximum displacement per applied voltage per mm of ceramic thickness was produced by the devices, which had an MTR of 0.33 to 0.37, with no top, and with a ceramic thickness of 0.38mm.
机译：在过去的几年中，已经在几种不同的边界条件下对执行器进行了表征和分析。这些条件之一就是负载，这在执行器用于结构的任何应用中都起着至关重要的作用。这项研究集中于比较相同长度和宽度但具有不同层组成的不同类型执行器在负载下的位移。在不同的电压下使用相同的负载和激励频率。测试了十一组不同的设备，其金属厚度比（MTR-金属厚度与总厚度的比）在0.3到0.44之间变化。所使用的金属是不锈钢和黄铜。结果表明，MTR在0.31到0.37之间的设备能够举起76克的负载。具有该MTR的所有设备的陶瓷厚度均为0.38mm，并具有不锈钢或黄铜底衬。还观察到，大多数器件的正峰位移和负峰位移相等，除了金属与PZT厚度比为1的器件，其负峰位移比正峰位移高出65％以上。这可能是由于中性轴的位置不同，预应力的分布以及设备在负载下的变形所致。已经发现，通过该装置产生每mm陶瓷厚度的每施加电压的最大位移，该装置的MTR为0.33至0.37，无顶部，并且陶瓷厚度为0.38mm。

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