[논문]볼트 체결형 란주반 초음파 트랜스듀서의 프렌지 포인트 최적화를 위한 실험적 방법 제안

김정순; 김해운; 김무준

doi:10.7776/ask.2021.40.4.270

볼트 체결형 란주반 초음파 트랜스듀서의 프렌지 포인트 최적화를 위한 실험적 방법 제안
Suggestion of an experimental method for optimization of flange point of a bolt-clamped Langevin-type ultrasonic transducer 원문보기

한국음향학회지= The journal of the acoustical society of Korea, v.40 no.4, 2021년, pp.270 - 277

김정순 (동명대학교 전기공학과) , 김해운 (부경대학교 물리학과) , 김무준 (부경대학교 물리학과)

초록
AI-Helper

강력초음파 분야에 있어서, 트랜스듀서의 고정을 위한 프렌지의 위치설정은 트랜스듀서의 변환효율에 큰 영향을 주는 중요한 요소이다. 본 연구에서는 볼트 체결형 란주반 초음파 트랜스듀서의 공진모드에 따른 프렌지의 설치 위치를 결정하기 위한 실험적 방법을 제안하였다. 제안된 방법에서는 반원형 쐐기 형태의 지그를 제작하여 트랜스듀서의 측면을 따라 이동하며 지그에 일정한 압력을 가한 후 트랜스듀서의 진동특성을 분석하였다. 압력을 가하는 위치에 따른 트랜스듀서의 입력 어드미턴스의 변화를 분석하여 프렌지의 최적의 위치를 결정할 수 있었다. 이 위치들은 메이슨 등가회로를 적용하여 계산한 공진 주파수 및 전송선로 모델 해석으로부터 계산한 각 공진 모드에 대한 입자속도 분포로부터 예측한 진동 모드의 절의 위치와 좋은 대응을 보이고 있어 본 연구에서 제안된 방법의 유효성을 확인할 수 있었다.

Abstract ▼ AI-Helper

In the power ultrasound fields, the flange position for fixing the transducer is an important factor influencing on electro-mechanical efficiency of the transducer. We suggested a practical method that can determine the installation position of the flange for different resonance modes of the bolt-clamped type Langevin ultrasonic transducer. A semicircular wedge-shaped jig was manufactured and moved along the lateral surface of the transducer. The vibration characteristics were examined after a constant pressure was applied to the semicircular wedge-shaped jig. By observing the change of the input admittance of the transducer depending on the position of the pressure application, the optimum position for the flange installation could be determined. The resonant modes of the transducer were calculated by a Mason's equivalent circuit, and the particle velocity distribution for each resonance mode was calculated by a transmission line model. Since the optimum positions determined from an experimental result show a good correspondence with the node positions of the vibration modes calculated by the transmission line model, the validity of the suggested method was verified.

주제어

표/그림 (10)

그림 Fig. 2. (Color available online) Mason's equivalent circuit for the Langevin-type ultrasonic transducer. Z is the mechanical impedance of each elastic body, v is the particle velocity, and f is the force. V_E and I_E represent the voltage and the current at the electrical terminals, C₀ the clamped capacitance, 𝜙 the turn ratio of the transformer.
그림 Fig. 1. Construction of the bolt-clamped Langevin-type ultrasonic transducer. Two disk- shaped piezoelectric ceramics with a thickness of 5 mm were layered that polarization directions faced each other. The layered piezoelectric vibrator is inserted between aluminum rods and it is clamped by a stainless steel bolt.
그림 Fig. 3. (Color available online) Schematic of the semicircular wedge-shaped jig for fixing the bolt-clamped Langevin-type ultrasonic transducer.
그림 Fig. 4. (Color available online) Design and schematic of the experimental setup. (a) The head mass of the Langevin-type ultrasonic transducer is fixed with a semicircular wedge-shaped jig. The constant pressure is applied to the jig by rotating the bolt of the right side. (b) The input impedance of the Langevin-type ultrasonic transducer is measured for different position d using the impedance analyzer.
그림 Fig. 5. Input admittance characteristics of piezoelectric vibrator of the bolt-clamped Langevin-type ultrasonic transducer. (a) Conductance that real part of the input admittance and (b) susceptance that imaginary part of the input admittance.
그림 Fig. 6. Calculation result of the input admittance of the bolt-clamped Langevin-type ultrasonic transducer.
그림 Fig. 7. Experimental result of the input admittance of the bolt-clamped Langevin-type ultrasonic transducer.
표 Table 1. Material constants used in the calculation.
그림 Fig. 8. Calculation result of the particle velocity distribution for the bolt-clamped Langevin-type ultra-sonic transducer under free-ends condition. In the figure, the dotted rectangles refer to the parts of the transducer, the discontinuous distributions appear at the interfaces between the dot pattern part representing the piezoelectric ceramic and the void rectangles representing the aluminum rods.
그림 Fig. 9. (Color available online) Variation of the conductance depending on fixing point on the bolt-clamped Langevin-type ultrasonic transducer. In the figure, the dotted line refers to the conductance for each mode of the transducer without the jig, and the solid lines refer to the conductance when the jig is held at each position of d. (a) In the fundamental mode, the thick solid line shows the conductance when the position of the jig is d = 21.96 mm, and it shows the closest resonant frequency to that of in the case of no jig. (b) In the 2^nd harmonic mode, the closest resonant frequency appears when the position of jig is d = 6.58 mm. (c) In the 3^rd harmonic mode, the closest resonant frequency appears when the position of jig is d = 10.28 mm.

참고문헌 (13)

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상세보기
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상세보기
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상세보기
D. Yamaguchi, T. Kanda, and K. Suzumori, "An ultrasonic motor for cryogenic temperature using bolt-clamped Langevin-type transducer," Sens. Actuators A Phys. 184, 134-140 (2012).

상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
V. M. Ristic, Principles of Acoustic Devices (John Wiley & Sons, Toronto, 1983), Chap. 5.
N. Chubachi and M. Kim, "Transmission line model equivalent circuit piezoelectric transducers including the effect of electrical terminal impedance," Jpn. J. Appl. Phys. 35, 3231-3235 (1996).

상세보기
T. Fukuoka, "Theory and practice of bolt tightening process," JIME. 46, 119-125 (2011).

저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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