Experimental and Numerical Investigation of the Arms Displacement in a New Electrothermal MEMS Actuator

Subject Areas : Mechanical Engineering

M.  Kolahdoozan ¹ (Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)
A.  Rouhani Esfahani ² (Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)
M.  Hassani ³ (Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran)

Received: 2017-01-19 Accepted : 2017-03-05 Published : 2017-08-24

Keywords: Artificial Neural Network, Micro electro mechanical system, Finite Element Method, Electrothermal actuator,

Abstract :

Microgrippers can be effectively applied for handling, positioning and assembling of the micro components. In the present study, a new design of a U-shape electrothermal microgripper was fabricated and developed with the voltages correspond between 1 to 10 volts. The microgripper was made of silicone with thickness of 25 microns, and pieces between 460 to 480 microns. The proposed microgripper has a simpler design and more facile fabrication comparing to most reported electrothermal microgripper. The behavior of the microgripper was simulated in COMSOL software to measure the displacement of the arms which hold and heat generations during the voltage changes. The present microgripper has more thermal and voltage tolerance comparing to other electrothermal microgripper. Furthermore, the obtained amount of tip displacement for voltage changes is acceptable. Another simulation method based on a three layer artificial neural network model (ANN) was carried out. Feed forward back propagation algorithm was employed as training algorithm to predict the displacement. The obtained results from both models proved that ANN model had better estimation due to the mean absolute percentage error of 1.024% and determination coefficient of 0.9995. Moreover, they confirm higher capability and accuracy of ANN in prediction of arms displacement compared to FEM.

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