Design and modeling of a hydraulically amplified magnetostrictive actuator for automotive engine mounts

Suryarghya Chakrabarti; Marcelo J. Dapino

doi:10.1117/12.848875

29 March 2010 Design and modeling of a hydraulically amplified magnetostrictive actuator for automotive engine mounts

Suryarghya Chakrabarti, Marcelo J. Dapino

Proceedings Volume 7645, Industrial and Commercial Applications of Smart Structures Technologies 2010; 76450G (2010) https://doi.org/10.1117/12.848875
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

A model is developed which describes the dynamic response of a Terfenol-D actuator with a hydraulic displacement amplification mechanism for use in active engine mounts. The model includes three main components: magnetic diffusion, Terfenol-D constitutive model, and mechanical actuator model. Eddy current losses are modeled as a one-dimensional magnetic field diffusion problem in cylindrical coordinates. The Jiles-Atherton model is used to describe the magnetization state of the Terfenol-D driver as a function of applied magnetic fields. A quadratic, single-valued model for the magnetostriction dependence on magnetization is utilized which provides an input to the mechanical model describing the system vibrations. Friction at the elastomeric seals is modeled using the LuGre friction model for lubricated contacts. The actuator's dynamic response is quantified in terms of the output displacement in the unloaded condition and force output in the loaded condition. The model is shown to accurately quantify the dynamic behavior of the actuator over the frequency range considered, from near dc to 500 Hz. An order analysis shows that the model also describes the higher harmonic content present in the measured responses. A study on the variation of energy delivered by the actuator with the load stiffness reveals that the actuator delivers the highest energy output near the stiffness match region.

Citation Download Citation

Suryarghya Chakrabarti and Marcelo J. Dapino "Design and modeling of a hydraulically amplified magnetostrictive actuator for automotive engine mounts", Proc. SPIE 7645, Industrial and Commercial Applications of Smart Structures Technologies 2010, 76450G (29 March 2010); https://doi.org/10.1117/12.848875

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