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When electrical pulses are applied on the crack tip, the electrical current can affect the different acoustic response under various multi-physical coupling aspects. The existence of the crack tips tend to intensify these effects. Apparently, the role of the electrical density (101∼102A/mm2) enhances the unpinning of dislocations on the defect as a result electroplastic effect[1]. The plastic deformation...
This paper investigates Electromagnetically Induced Acoustic Emission (EMAE) that can be used to detect the microcrack. In EMAE, Acoustic Emission (AE) is induced by Lorentz and Magnetostriction Force. The EMAE experiments under different exciting currents are carried out. In this paper, we use an Electromagnetic Acoustic Transducer (EMAT) to stimulate AE signals. According to Kaiser Effect and AE...
In this paper, a passivity-based control (PBC) algorithm with disturbance reject is proposed to obtain precise position control of a Linear Switched Reluctance Motor (LSRM) driving system in short distance applications. In the framework of the two-time-scale analysis, the whole system is decomposed into two reduced-order models. With the models, an improved PBC algorithm is designed to reject the...
In this paper, we report on the design, modeling, and experimental testing of a piezoelectric-driven microgripper making use of both an integrated gripping force sensor and an integrated tip displacement sensor. In the developed microgripper, a stack piezoelectric ceramic actuator is used to simultaneously obtain the tip displacement and the gripping force. A novel monolithic compliant mechanism is...
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