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- 저자 : 정영호(Yeong Ho Jeong) (검색결과 86 건)
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두께와 직경 비에 따른 두께진동모드 압전소자의 공진 변위 궤적
정영호,Jeong, Yeong-Ho 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.2
In this study, thickness vibration mode piezoelectric devices for AE sensor application were simulated using ATILA FEM program, and then fabricated. Trajectory resonant displacement and electro mechanical coupling factors of the piezoelectric devices were investigated. The simulation results showed that excellent displacement and electro mechanical coupling factor was obtained when the ratio of diameter/thickness($\Phi/T$) was 0.75. The piezoelectric device of $\Phi/T$=0.75 exhibited the optimum values of fr= 183 kHz, displacement= $4.44{\times}10^{-7}[m]$, $k_{33}$= 0.69, which were suitable for the application of AE sensor piezoelectric device.
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음향방출 센서 응용을 위한 결합진동 모드 압전소자의 공진 변위 궤적
정영호,신상훈,류주현,Jeong, Yeong-Ho,Shin, Sang-Hoon,Yoo, Ju-Hyun 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.2
In this study, coupled mode piezoelectric devices for AE sensor application with excellent displacement and piezoelectric characteristics were simulated using ATILA FEM program, and then fabricated. Displacements and electromechanical coupling factors of the piezoelectric devices were investigated. The simulation results showed that excellent displacement and electromechanical coupling factor were obtained when the ratio of diameter/thickness was 1.0. The piezoelectric device of ${\Phi}/T$= 1.0 exhibited the optimum values of fr= 406 kHz, displacement= $6.11{\times}10^{-8}[m]$, $k_{eff}$= 0.648. The results show that the coupled vibration mode piezoelectric device is a promising candidate for the application of AE sensor piezoelectric device.
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정영호,Jeong, Yeong-Ho 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.5
The response characteristics of AE (acoustic emission) sensors with a coupled vibration mode and a non-coupled vibration mode were investigated according to PD(partial discharge) quantities in XLPE (cross linked polyethylene) sheets and craft papers immersed in insulating oil. The response voltages of a coupled vibration mode AE sensor were linearly proportional to the PD quantities up to 1,000 pC in XLPE sheets, while a non-coupled vibration mode AE sensor did not show the similar linearity. In case of a test of craft papers immersed in insulating oil, a linearity between response voltages and PD quantities was observed up to 550 pC, but after that, similar linearity between response voltage of any types of AE sensor and PD quantities was not shown.
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