• Journal of Welding and Joining
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• 제14권6호
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• pp.81-92
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• 1996

This study is to compare the weldability of Zircaloy-4 end cap of nuclear fuel pin using by GTA and Nd :YAG LB. The welding parameters which affect bead width and penetration depth have been investigated. The effect of joint geometry of end cap for GTAW and LBW has been studied and optimum conditions of Zircaloy-4 endcap welding have been found. Microstructures and microhardness of GTA and LB welded zones have been also compared.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 하계학술대회 논문집 Vol.3 No.2
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• pp.674-677
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• 2002

In this paper, two kinds of windmill type motors which have a disk shape and a ring shape piezoelectric ceramics were studied. And characteristics of two models were compared with each others. A windmill type ultrasonic motor is composed of a stator, a rotor, and a ball bearing. The stator is made of a piezoelectric ceramics and two metals endcaps. When the piezoelectric ceramics vibrate, displacement of torsonal vibration appear at metal endcaps. The motor with 11.0[mm] diameter was studied by finite element analysis. The voltage of 100[V] was supplied at each model. Resonance frequency of 206.875[KHz] was obtained at the disk type, but ring type was 137.562[KHz]. The maximum torsonal displacement of $1.112[{\mu}m]$ was obtained at the disk type, but ring type was $1.698[{\mu}m]$.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 하계종합학술대회 논문집
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• pp.1083-1086
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• 1999

중수로(CANDU) 형 월성 원자력발전소의 칼란드리아 압력관 전면부를 감시점검하기 위한 열영상 관측시스템을 설계/제작하였다. 중수로는 가동중에 핵연료를 교체한다. 칼란드리아 전면부에는 380 개의 압력관 채널이 위치하고 있다. 핵연료를 교체할 시에 핵연료 교체장비가 칼란드리아 압력관 채널의 ENDCAP을 열고 핵연료를 장전하는 과정에서 발생할 지도 모르는 중수누출, 핵연료교체장비의 이상상태를 점검하는데 목적이 있다. 열영상카메라는 상용 CCD 카메라에 비해 영상의 해상도가 떨어진다. CCD 카메라는 수증기 누출과 같은 육안검사에 활용하고, 열영상카메라는 압력관 채널의 온도변화 등을 점검하기 위해 CCD/열영상카메라의 융합구조로 설계/제작하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.79-82
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• 2002

In this paper, a single phase driven piezoelectric motor design was presented for linear motion. Two metal/ceramic composite actuators, a piezoelectric ring which was bonded to a metal endcap from one side, were used as the active elements of this motor. The motor was composed of a piezoelectric ceramic, a metal ring which has 4 arms, and a guider. Motors with 30.0[mm] and 35.0[mm] diameter were studied by finite element analysis and experiments. As results, the maximum speed of motor was obtained at resonant frequency. When the applied voltage of the motor increased, the speed was increased. Also, bidirectional motion of the motor was achieved by combining two motors which have different resonant frequency.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.323-326
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• 1999

In this paper, a windmill type ultrasonic motor operated by single-Phase AC electric field was fabricated, and then torque characteristics were investigated. A metal-ceramic composite component was used as the stator\`s vibrator to generate ultrasonic vibrations. The windmill type ultrasonic motors has only three components; a stator element with two wind-mill shape slotted metal endcaps, a rotor and a bearing. In this parer we measured torque, when stator\`s slot was changed Iron 4, 6, 8. Brass metal was pressed with umbrella-type using metal molt then slot of 3 kind was manufactured. The maximum revolution speed was 388(rpm) in the case of a small ultrasonic motor of 11.35 mm diameter, 8 slot and 1.01 mm thickness. The maximum torque of 0.17 mNm was obtained at a speed of 131 rpm.

• 한국전기전자재료학회논문지
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• 제16권6호
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• pp.484-489
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• 2003

In this paper, a single phase driven piezoelectric motor design was presented for linear motion Two metal/ceramic composite actuators, a piezoelectric ring which was bonded to a metal endcap from one side, were used as the active elements of this motor. The motor was composed of a piezoelectric ceramic, a metal ring which has 4 arms, and a guider. Motors with 30 [mm] and 35 [mm] diameter were studied by finite element analysis and experiments. As results, the maximum speed of motor was obtained at resonance frequency. When the applied voltage of the motor increased, the speed was increased. Also, bidirectional motion of the motor was achieved by combining two motors which have different resonance frequency. But the characteristics of bidirectional motion were not equaled, because of the problem of reproduction on the fabrication and the experiment. If present motor is used at the auto-zoom device of a camera, it will have much advantage. Because the direct linear motion can be achieved with a simple structure of motor and no gearbox of total system.

• 한국전기전자재료학회논문지
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• 제13권5호
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• pp.390-395
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• 2000

The ultrasonic motor have recently begun to be used for certain unique practical utilizations in the fields of industrial medical consumer and automotive applications. Ultrasonic motor stimulated to ultrasonic oscillations by piezoelectrics to drive a rotor via friction contact. The metal and ceramic composite component was used as the stator element to generate ultrasonic vibrations. The ultrasonic motor used here was the windmill type ultrasonic motor operated by single-phase AC source. The windmill type ultrasonic motors has only three components; a stator element of two windmill shape slotted metal endcaps a rotor and a bearing. In this paper a prototype motor with 11.35 mm diameter was fabricated then relationship between the pressing force applied to a rotor and the rotation characteristic of windmill type ultrasonic motor are investigated when stator’s slots was changed from 4, 6, 8 and thickness changed from 0.15, 0.20 mm, respectively. Optimum pressing force applied to a rotor in the six stators was 1.2 mN.

• 한국산학기술학회논문지
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• 제17권2호
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• pp.666-671
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• 2016

본 논문에서 소개하는 기기는 병의원의 수술실에서 수술전용조명인 무영등만으로는 직접 조명할 수 없는 수술부위의 환부에 근접 국부조명을 제공하는 장치로서, 임상의들이 인체 깊숙한 환부의 질환 치료를 안전하게 시술하도록 한다. 이 의료 보조조명 장치는 종양제거나 혈관봉합과 같은 미세한 수술과정에서 발생할 수 있는 치명적인 수술 실패를 방지하기 위해서 필요한 장치이다. 광원 및 전원부 등의 구성요소는 저전력, 소형화로 설계되었으며, 협각렌즈를 사용하여 광확산 효과의 증가와 집중 조명에 용이하도록 하였다. 광케이블을 사용한 조명전송과 조명장치의 Endcap은 사용 후 다음 환자를 위하여 소독이 가능하도록 방수형으로 설계되었다. 리트렉터 조명장치 개발 후 이루어진 광원특성 측정 결과, 조도 490lux, 휘도 $11,550cd/m^2$, 연색성 78, 색온도 11,000K 및 고른 조도분포도를 보여 국부 의료보조조명으로서 적합하였음이 확인되었다.

• 한국광학회지
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• 제32권2호
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• pp.49-54
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• 2021

본 논문에서는 고출력 광섬유 레이저의 핵심 부품인 대구경 광섬유 엔드캡을 제작하는 장비를 설계 및 제작하였으며, 제작장비를 이용하여 대구경 광섬유 엔드캡을 제작하였다. 대구경 광섬유 엔드캡 제작장비는 레이저 광을 조사하여 접속 열원으로 사용하기 위한 CO2 레이저 광원부, 대구경 광섬유와 엔드캡의 위치를 이송하기 위한 정밀 스테이지 조립체, 스테이지 조립체와 연동되어 융착 시 정렬에 사용되는 비전 시스템으로 구성되어 있다. 레이저 광원의 출력은 스테이지 조립체와 연동되어 출력을 제어하며, 비전 시스템으로 대구경 편광유지 광섬유의 편광축을 정렬할 수 있도록 제작되었다. 자체 제작한 장비를 이용하여 클래드 직경이 400 ㎛인 대구경 편광유지 광섬유와 10(W)×5(D)×2(H) ㎣의 엔드캡을 레이저 융착하여 대구경 광섬유 엔드캡을 제작하였다. 제작된 대구경 광섬유 엔드캡의 신호광 삽입손실, 소광률 및 빔품질(M2)은 각각 0.6%, 16.7 dB, M2x=1.21, M2y=1.22로 측정되었다.