Optimization Strategy of New Galfenol Force Sensing Structure and Energy Efficiency Based on Alternating Loads

Abstract

Abstract:

A new Galfenol force sensing structure was proposed, where the Galfenol alloy was taken as the sensing element. The two ends of the alloy were manufactured into the interfaces which could be assembled with external locking structures. Therefore the Galfenol rod could be subjected to both of compression and tensile. The sensing of the magnitude and direction of the external alternating loads could be implemented by measuring the induced voltage of Galfenol due to the change of the magnetic susceptibility. In order to increase the energy efficiency, a sealed structure was developed to optimize the flux path of the Galfenol force sensor. 2D and 3D finite element methods were used to study the distribution of the flux density and the energy efficiency of the proposed structure was compared with the open architecture path. Simulation and experimental results show that the uniformity of the distribution of flux density in Galfenol rod can be improved greatly by using the proposed sensing structure. Furthermore, the energy efficiency can be increased significantly over 50%. The optimization and the design of the proposed structure were verified with experiments by applying the alternating loads to the sensor structure.

Key words: Galfenol alloy; , alternating load; , force sensing; , flux distribution; , energy efficiency

摘要：

提出了一种新的面向交变载荷的力传感器测量结构，以Galfenol合金为敏感元件，将合金的两端加工成与锁紧结构配合的接口，可以对Galfenol棒进行挤压或者拉伸，通过检测材料磁化率变化引起的感应电动势可以确定外加交变负载的大小与方向。在传感器工作机理的基础上，提出了一种传感器能量利用效率优化策略，采用封闭结构对Galfenol合金力传感器磁路进行了设计与优化，分别采用二维和三维有限元方法，研究了开放式磁路结构和提出的新型结构在磁路分布以及能量利用效率上的特征。仿真和实验结果表明，所提出的新型传感器结构，不仅在结构上可以增强Galfenol合金中磁通密度分布的均匀性，同时可以大幅提升传感器的能量利用效率，其提升率超过50%，同时对所设计的传感器结构进行加载交变载荷试验，试验结果验证了传感器设计方案的可行性。

关键词: Galfenol合金, 交变载荷, 力传感, 磁通分布, 能量利用率

CLC Number:

TH823

Shu Liang, Wu Guichu, Chen Dingfang. Optimization Strategy of New Galfenol Force Sensing Structure and Energy Efficiency Based on Alternating Loads[J]. China Mechanical Engineering, 2014, 25(23): 3188-3194.

舒亮, 吴桂初, 陈定方. 一种交变载荷下Galfenol力传感器结构与能量效率的优化策略[J]. 中国机械工程, 2014, 25(23): 3188-3194.

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