Design of Large Displacement Piezoelectric Bimorphs with Finite Element Method

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J. Korean Ceram. Soc. > Volume 34(4); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(4): 337.

유한 요소법을 이용한 대변위 압전 Bimorph 설계

임종인, 노용래¹, 김선욱

포항 산업과학연구원 기능세라믹팀
¹경북대학교 전자공학과 센서공학과

Design of Large Displacement Piezoelectric Bimorphs with Finite Element Method

ABSTRACT

This paper describes the design and evaluation of new type piezoelectric bimorph actuator that shows much large mechanical response than those conventional types. The bimorph actuator has modified structure combined with the multilayer actuator(MLA) and the composite multilayer actuator called "Moonie". The design and performancean alysis of bimorph actuator are carried out with Finite Element Method (FEM). Theoretical calculation results show that the generating force and displacement of Moonie-modified bimorph actuator can be improved by about 130% and 150%, respectively. The overshooting and ringing phenomena of the bimorph can be effectively restrained by the pseudo step electric field having a rising time coincied with a period of the fundamental vibration mode of the bimorph.e bimorph.

Key words: Piezoelectric actuator, Bimorph, Multilayer, Moonie actuator, Finite element method