Theoretical model and transient displacement characteristics of U⁃shaped electrothermal actuator

被引：0
|
作者：
Lu X. [1 ]
Wang X. [1 ]
Chen H. [1 ]
机构：
[1] School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing
来源：
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | 2023年 / 55卷 / 01期
关键词：
Chebyshev spectrum method; coupling; edge detection; electrothermal actuator; micro⁃dynamic measurement; transient displacement characteristics;
D O I：
10.11918/202201086
中图分类号：
学科分类号：
摘要：
Considering that material parameters of U⁃shaped electrothermal actuators are affected by the temperature nonlinearity and the discontinuous boundary problem in the simplified model, the transient displacement characteristics were studied. By introducing temperature⁃related material renewal functions, based on thermodynamic theories such as energy conservation equations and material mechanics theories such as virtual work principles, the electro⁃thermal⁃mechanical coupling model of U⁃shaped electrothermal actuators was established. The improved Chebyshev spectrum method was used to solve the constructed coupling model, and the expression of temperature and transient displacement of U⁃shaped electrothermal actuator was obtained. The results of finite element simulation and theoretical analysis were basically the same, verifying the correctness of the model. An experimental platform for the transient displacement characteristics of the electrothermal driver was built, and the displacement response experimental results of the U⁃shaped electrothermal driver under constant voltage excitation were compared with the theoretical and simulation results. The transient displacement characteristics of the driver under the action of a periodic sinusoidal voltage were analyzed. The test and analysis results show that the displacement change trend of the U⁃shaped micro⁃electric thermal driver showed a sinusoidal change after a period of time, and the change period was equal to the voltage period; the displacement change range varied positively with the peak⁃to⁃peak voltage, and negatively with the change in voltage frequency. © 2023 Harbin Institute of Technology. All rights reserved.
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页码：24 / 31
页数：7
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