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실험계획법을 이용한 예인 음탐기용 음향패키지 형상 연구
이정현,신증호,권오조,김군칠,Lee, JungHyun,Shin, Jeungho,Kwon, Oh-Cho,Kim, Gunchil 한국음향학회 2019 韓國音響學會誌 Vol.38 No.2
본 연구에서는 예인 음탐기용 음향패키지에 대한 수신전압감도 특성을 분석하기 위해 수치해석과 실험계획법을 적용하였다. 수치해석 결과는 초기 설계된 음향패키지의 구조 공진 모드 특성으로 인한 수신전압감도 변화를 보여준다. 수신전압감도 편차를 줄이기 위해 도출된 음향패키지 설계 변수의 영향은 실험계획법을 통해 분석하였다. 수신전압감도 편차는 수중청음기 쉴드캔 두께(t)의 변화에 가장 민감한 것을 확인하였다. 수조시험 결과 실험계획법에 의해 도출된 음향패키지는 수신전압감도 편차가 감소됨을 확인하였다. In this paper, the characteristics of receiving voltage sensitivity about acoustic package in towed array sonar is analyzed through the numerical simulation and design of experiments. Simulation results show that the variation of receiving voltage sensitivity is caused by the structural resonance mode shape on baseline acoustic package. The effect of design parameters of the acoustic package are analyzed through the design of experiments to reduce the deviation of receiving voltage sensitivity. A change of hydrophone shield can thickness (t) is the greatest effect on the deviation of receiving voltage sensitivity. As a result of water tank test, the acoustic package derived from the design of experiments has reduced deviation of receiving voltage sensitivity.
A Research of Power-Efficient Driving Scheme for Auto-Focus on Image Sensor Module
차상현,박찬우,이연중,황병원,권오조,박득희,권경수,이재신,황신환,Cha, Sang-Hyun,Park, Chan-Woo,Lee, Yuen-Joong,Hwang, Byoung-Won,Kwon, Oh-Jo,Park, Deuk-Hee,Kwon, Kyoung-Soo,Lee, Jae-Shin,Hwang, Shin-Hwan Institute of Control 2009 제어·로봇·시스템학회 논문지 Vol.15 No.12
We present a power-efficient driving scheme that consists of piezoelectric actuator and driver IC for AF (Auto-Focus) on ISM (Image Sensor Module). The piezoelectric actuator is more power-efficient than conventional voice coil motor actuator. And high power-efficiency driver IC is designed. So the proposed driving scheme using designed piezoelectric actuator and driver IC is more close to recent trend of green IT. The diver IC should guarantee fast and accurate performance. So, the optimum driving method and high accurate frequency synthesizer are proposed. The die area of designed driver IC is $2.0{\times}1.6mm^2$ and power consumption is 2.8mW.
유정수,신현경,안형택,권오조 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
Performance of array sonars towed underwater is limited due to the self-noise induced mainly by the vibration of the towing cable and also turbulent flow around the acoustic sensor module. The vibration of the towing cable excites axisymmetric waves that propagate along the acoustic module of the array sonar and produce self-noise. The present study aims to investigate the characteristics of the self-noise induced by the axisymmetric vibrations of the acoustic module. The waves of interest are the bulge and extensional waves propagating along the fluid-filled elastic hose. Dispersion relations of these waves are predicted by means of the numerical simulation to evaluate the wave speeds. The self-noise induced by the axisymmetric waves are formulated taking into account the damping of the elastic hose.
선배열 예인 음탐기의 음향 모듈을 따라 전파하는 축대칭 진동에 기인한 음향 센서 자체 소음 해석
유정수(Ryue, Jung-Soo),신현경(Shin, Hyun-Kyung),안형택(Ahn, Hyung-Taek),권오조(Kwon, Oh-Cho) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.5
Performance of array sonars towed underwater is limited due to the self-noise induced mainly by the strumming vibration of the towing cable and also turbulent flow around the acoustic sensor module. The vibration of the towing cable generates axisymmetric waves that propagate along the acoustic module of the array sonar and produce self-noise. The present study aims to investigate the characteristics of the self-noise induced by the axisymmetric vibrations of the acoustic module. The waves of interest are the bulge and extensional waves propagating along the fluid-filled elastic hose. Dispersion relations of these waves are predicted by means of the numerical simulation to evaluate the wave speeds. The self-noise induced by the axisymmetric waves are formulated taking into account the damping of the elastic hose and the effect of the damping is investigated.
A Research of Power-Efficient Driving Scheme for Auto-Focus on Image Sensor Module
Sanghyun Cha(차상현),Chanwoo Park(박찬우),Yuenjoong Lee(이연중),Byoungwon Hwang(황병원),Ohjo Kwon(권오조),Deukhee Park(박득희),Kyoungsoo Kwon(권경수),Jaeshin Lee(이재신),Shinhwan Hwang(황신환) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.12
We present a power-efficient driving scheme that consists of piezoelectric actuator and driver IC for AF (Auto-Focus) on ISM (Image Sensor Module). The piezoelectric actuator is more power-efficient than conventional voice coil motor actuator. And high power-efficiency driver IC is designed. So the proposed driving scheme using designed piezoelectric actuator and driver IC is more close to recent trend of green IT. The diver IC should guarantee fast and accurate performance. So, the optimum driving method and high accurate frequency synthesizer are proposed. The die area of designed driver IC is 2.0 × 1.6㎟ and power consumption is 2.8㎽.
김세훈(S.H. Kim),안형택(H.T. Ahn),유정수(J.S. Ryue),신현경(H.K. Shin),권오조(O.J. Kwon),서희선(H.S. Seo) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.1
Fluid-Structure Interaction analysis of a circular cylinder surrounded by incompressible turbulent flow is presented. The fluid flow is modeled by incompressible Navier-Stokes equations in conjunction with large-eddy simulation for turbulent vortical flows. The circular cylinder is modeled as elastic continuum described by elasto-dynamic equation of motion. Finite element method based approach is utilized for unified formulation of fluid-structure interaction analysis. The magnitude and frequency of structural response is analysed in comparison to the driving fluid forces.