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박춘광(Chunguang Piao),김진오(Jin Oh Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
This paper theoretically deals with vibration characteristics of a transducer coupled with a piezoelectric disc. Natural frequencies of in-plane and out-of-plane modes of the transducer were obtained from the equations of motion and boundary conditions by theoretical analysis. Moreover, the natural frequencies were obtained from the impedance curves calculated by the finite-element analysis also. The theoretical analysis was verified by comparing the two analysis results. The radial in-plane and axial out-of-plane vibrations appear coupled in the axisymmetric vibration modes. Out-of-plane vibration modes of the piezoelectric transducer were much affected due to the coupled disc, but in-plane vibration modes were not.
박춘광(Chunguang Piao),김진오(Jin Oh Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
This paper deals with the vibration characteristics of the piezoelectric disc laminated with an elastic disc. Natural frequencies of the laminate layers were obtained by theoretical analysis, and they were compared with the finite-element analysis and experiment. The radial in-plane vibration and axial out-of-plane vibration appear coupled in axisymmetric vibration modes. Due to the elastic disc, out-of-plane vibration modes of the piezoelectric disc were much affected, but in-plane vibration modes were not.
박춘광(Chunguang Piao),김진오(Jin Oh Kim) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.10
This paper experimentally deals with the vibration characteristics of flat ring transducers used for ultrasonic sensors and actuators. Radial vibration mode, which is the fundamental mode of a thin piezoelectric transducer, was measured by a laser in-plane vibrometer. An impedance analyzer was used to measure natural frequencies. The results measured by experiments verified theoretical predictions. The vibration characteristics of ring transducers were identified according to the outer diameter size. The shape of the fundamental mode is almost uniform but slightly decreases from the inner to the outer circumferential surfaces. The natural frequency of the fundamental mode decreases as the outer diameter increases. It appears that the ring type transducer is suitable to excite uniformly distributed vibration on a flat surface.
가진부와 감지부를 구분한 다층 압전 트랜스듀서의 진동 특성
박춘광(Chunguang Piao),선상옥(Sang Ok Seon),김진오(Jin Oh Kim) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.6
This paper deals with the vibration characteristics of a multilayered piezoelectric transducer. The transducer consists of multiple piezoelectric layers for exciting, one piezoelectric layer for sensing and insulation layers. Theoretically, natural frequencies and mode shapes of radial in-plane modes of the piezoelectric transducer were obtained from equations of motion and boundary conditions. By the finite element modal analysis, the natural frequencies were obtained from calculated impedance curves, and the vibration amplitudes were calculated to supplement three-dimensional mode shapes. Experimentally, the natural frequencies were measured by an impedance analyzer. The theoretical analysis was verified by comparing three kinds of results, and it was confirmed that the vibration exciter and sensor of a transducer could be separated by piezoelectric multilayers.
박춘광(Chunguang Piao),황정길(Jeong Gil Hwang),김진오(Jin Oh Kim),이상훈(Sang Hoon Lee) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.1
This paper deals with excitation and sensing of bending vibration in a rod using a piezoelectric transducer. This research was needed to develop a vibration-type level-switch sensor. The transducer was composed of multiple piezoelectric discs, and its exciting and sensing parts were separated. The rod and transducer were axially symmetric, but they were coupled asymmetrically to generate a bending vibration in the rod. According to the bending vibration characteristics of the rod, excitation and sensing by the transducer were observed with the rod in air and underwater. These results made it possible to design and manufacture a level-switch sensor of a bending vibration rod.