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공진을 이용한 스마트 디바이스용 S-morph 피에조액츄에이터 개발
한상헌(S. H. Han),남자현(J. H. Nam),장건희(G. H. Jang) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
We propose a resonant s-morph piezoelectric actuator (RSPA) with high space efficiency and natural frequency within haptic frequency range for applying to smart device vibrators. RSPA consists of base, connector, cantilevers with two layers and weight. S-morph generates smaller displacement than uni-morph, but it has zero bending angle to generate uniform axial motion without tilting and space efficiency. We confirm the natural frequency and static displacement through the finite element analysis. In order to verify the validity of the analysis, we fabricate the RSPA sample and perform the vibration test. We show that the RSPA generate the axial displacement with zero bending angle, and has a natural frequency of 213.1 Hz within haptic frequency range(180 ~ 240 Hz).
연태흠(T. H. Yeon),장건희(G. H. Jang),남자현(J. H. Nam) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
This paper analyzes three cantilever-types of piezoelectric actuators of bimorph, unimorph and monomorph in same volume to maximize tip displacement. Tip displacement of each actuator is theoretically derived by using beam theory and numerically verified by FEM. It also investigates the tip displacements of each actuator due to the change of elastic layer. It shows that the piezoelectric actuator of bimorph generates the largest tip displacement among them.