High Sensitivity Impact Force Sensor Based on Galfenol Alloy

doi:10.3901/JME.2019.08.014

Abstract

Abstract: The present impact force sensor based on piezoelectric materials is limited in application range due to the material brittleness. Galfenol alloy is a steel like material with moderate magnetostrictive and high mechanical strength properties, which is more applicable for impact detection. A Galfenol alloy based impact force sensor is presented. Three different configurations of sensitive elements including uniform rod, rectangular beam, and un-uniform I beam, are designed. The continuous kinetic models are developed to compare the total sensing performance, and the optimal size of the un-uniform I beam is obtained by employing the orthogonal design method. The kinetic models indicate that the un-uniform I beam based sensor demonstrates optimal sensitivity compared with the other two designs. The un-uniform I beam is constructed experimentally and the senor is calibrated via a Levenberg-Marquardt fitting method. Experimental results show that the impact force can be detected accurately with a limited measurement error within 5.73%. The proposed sensor can be used to detect instantaneous impact, which broadening the application of Galfenol alloy in dynamic force detection. The impact can be applied directly on the sensitive element with no extra protection, leading to a compact structure. The sensitivity of the sensor is further improved by structural optimization.

Key words: Galfenol alloy, impact force sensing, Levenberg-Marquardt method, magnetostrictive, orthogonal design

CLC Number:

TB34

LI Bo, YANG Jiabin, SHU Liang, ZHU Yanchao, CHEN Dingfang. High Sensitivity Impact Force Sensor Based on Galfenol Alloy[J]. Journal of Mechanical Engineering, 2019, 55(8): 14-23.

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