• 한국압력기기공학회 논문집
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• 제7권3호
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• pp.40-47
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• 2011

KSNPs(Korea Standard Nuclear Power Plant) have been applied the break exclusion criteria to the high energy lines passing through containment penetration area to ensure that piping failures would not cause the loss of containment isolation function, and to reduce the resulting dynamic effects. Systems with the criteria are the Main Steam system, Feed Water system, Steam Generator Blowdown system, and Chemical & Volume Control system. In accordance with FSAR(Final Safety Analysis Report), a 100% volumetric examination by augmented in-service inspection of all pipe welds appled the break exclusion criteria is required for the break exclusion application piping. However, it is difficult to fully satisfy the requirements of inspection because 12", 8" and 6" weldolet weldments of Main Steam pipe line have complex structural shapes. To resolve the difficulty on the application of conventional UT(Ultrasonic Testing) technique, realistic mock-ups and UT calibration blocks were made. Simulations of conventional UT were performed utilizing CIVA, a commercial NDE(Nondestructive Examination) simulation software. Phased array UT experiments were performed through mock-up including artificial notch type flaws. A phased array UT technique is finally developed to improve the reliability of ultrasonic test at main steam line pipe to 12", 8" and 6" branch connection weld.

• 한국압력기기공학회 논문집
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• 제4권2호
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• pp.40-45
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• 2008

There exist many types of pipe and component fatigue through vibrations, thermal fatigues or shifting. In some cases of thermal stratification/thermal fatigue, pipes & components are receiving thermal stress by means of material expansion and shrinkage by continuous thermal repetitive variation. Small cracks initially occur on the inside surface by thermal stress. These cracks grow in depth the pipe wall and finally come to a rupture. Pipe parts of susceptibility to thermal stratification and thermal fatigue are now being examined by conventional UT(ultrasonic test) as volumetric examination. It is difficult to fully satisfy the code & standards requirements because 3" weldolet weldments of RCS 16" pipe to 3" branch connection lines have complex structural shape. To solve the problems of conventional UT examination, we made a realistic mock-up and UT calibration block. We performed a simulation of phased array UT utilizing CIVA as NDE(Non-Destructive Examination) simulation software. Also we designed phased array UT transducer and wedge, optimal frequency by using simulation data. We performed phased array UT experiment through mock-up including artificial flaws(notch). The phased array UT technique is finally developed to improve the reliability of ultrasonic test at RCS 16" pipe to 3" branch connection weld.

• 전기전자학회논문지
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• 제21권1호
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• pp.30-38
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• 2017

사이트에 설치되어 운용 중인 능동위상배열레이다가 외부의 충격 또는 장기간 운용에 따른 성능열화가 의심될 경우, 위상배열안테나의 이상여부를 확인해야 한다. 하지만, 위상배열안테나를 측정하기 위해서는 무반향성 챔버에서 근접전계 시험이 수행되어야 하므로, 레이다 장치의 분해 및 운송을 위해 많은 시간과 비용이 투입되어야 하고 레이다 시스템의 운용 가용도가 나빠지게 된다. 따라서, 본 논문에서는 사이트에서 위상배열안테나의 이상여부를 확인할 수 있도록 이동성을 구비한 능동위상배열안테나 근접전계 스캐너를 제안하고, 무반향성 챔버에서 측정한 데이터와 비교하여 크기 ${\pm}0.5dB$와 위상 ${\pm}1.5^{\circ}$ 오차수준으로 측정유효성을 검증하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.541-547
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• 1992

The phased array antenna has the ability to perform adaptive sampling by directing the radar beam without inertia in any direction. The adaptive sampling capability of the phased array antenna allows each sampling time interval to be varied for each target, depending on the acceleration of each target at any time. In this paper we design a three-dimensional adaptive tracking algorithm for the phased array radar system with a given set of measurement parameters. The tracking algorithm avoids taking unnecessarily frequent samples, while keeping the angular prediction error within a fraction of antenna beamwidth so that the probability of detection will not be degraded during a track update illuminations. In our algorithm, the target model and the sampling rate are selected depending on the target range and the target maneuver status which is determined by a maneuver detector. A detailed simulation is conducted to test the validity of our tracking algorithm for encounter geometries under various conditions of maneuver.

• ETRI Journal
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• 제27권6호
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• pp.677-684
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• 2005

A phased array antenna was fabricated using four-element ferroelectric phase shifters with a coplanar waveguide (CPW) transmission line structure based on a $Ba_{0.6}Sr_{0.4}TiO_3(BST)/MgO$ structure. Epitaxial BST films were deposited on MgO (001) substrates by pulsed laser deposition. To attain the large differential phase shift and small losses for a ferroelectric CPW phase shifter, an impedance-matching-part adding technique between the effective transmission line and connecting cable was used. The return loss and insertion loss for this techniqueadapted BST CPW device were improved with respect to those for a normal BST CPW device. For an X-band phased array antenna system consisting of ferroelectric BST CPW phase shifters, power divider, dc block, patch antenna, and programmed dc power, the steering beam could be tilted by $15^{\circ}$ in either direction.

• 한국전자파학회지:전자파기술
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• 제2권1호
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• pp.46-54
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• 1991

排列 素子간의 급전 位相差에 의하여 放射 빔의 방향을 조정할 수 있고 指向性과 利得을 높일 수 있는 마이크 로스트립 슬로트 素子가 圓形으로 排列된 位相 排列 안테나 시스템을 提案 設計하였다. 排列된 슬로트의 수와 圓의 반경을 변화시켜 요구되는 指向性과 利得을 얻을 수 있으나, 본 연구에서는 4개의 마이크로스트립 슬로트를 원주의 接線방향으로 排列시키고 바렉터 다이오드릎 사용한 아나로그 移相器로 안테 나 소자에 급전시켜 40。까지 放射 빔을 조정시킬 수 있는 位相排列 안테나시스템을 분산과 불연속 특성을 고려 하여 10 GHz에서 마이크로스트립 선로로 製作하였다. 측정 결과는 이론과 잘 일치하였으며, 64개의 마이크로스트립 디스크 패치를 短形排列시킨 경우(1)와 비교하였을 때 배열 소자의 수를 고려한 안테나의 性能이 전반적으로 향상되었음을 알 수 있었다.

• 대한기계학회논문집A
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• 제24권4호
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• pp.972-981
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• 2000

The phased array transducer has two distinct advantages. One is rapid scanning comparing with the conventional mechanical or manual scanning system. Therefore, output image is represented in real-time. The other is the dynamic focusing and the dynamic steering of ultrasonic beam. Only the delay times that are controlled electrically are used to focus and to steer beam without any lenses or wedges. In this study, the profile of the ultrasonic beam for the phased array transducer has been simulated in the Huygens principle with varying the inter-element spacing of the linear phased array transducer. From the result of this study, it was found that the ultrasonic beam spread wider as the inter-element spacing was decreased. However, the focusing effect was improved, even when the number of the element was not big. In addition, there was grating lobes that are constructed when the inter-element spacing is more than half wavelength. However, this grating lobe has lower amplitude than the main lobe.

• 한국전자통신학회논문지
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• 제18권1호
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• pp.11-22
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• 2023

평면 능동위상배열안테나 시스템에 있어, 간소화된 방사특성 측정 절차를 가지는 방사소자 결함진단 기법을 제시하였다. 이를 위해 평면 배열 구성에 대한 방사특성을 기반으로 선형 배열 구성으로 근사화 분석할 수 있는 방법 및 방사소자 결함진단과정에서 발생할 수 있는 유일해 문제를 해소하기 위한 방법을 연구하였다. 본 논문에서 제시된 기법 및 유전 알고리즘을 기반으로 다양한 평면 능동위상배열안테나 구성에 따른 방사소자 결함진단에 대한 모의실험을 수행하였다. 모의실험 결과, 제시된 방사소자 결함진단 기법은 다양한 구성을 가지는 평면 능동위상안테나에 대해서도 적용가능함을 확인하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.735-741
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• 2003

A simplified view of array design and application process was introduced. Array design is critical to achieve a successful phased array measurements. A planar microphone array is designed to produce optimum performance and also to fit economic requirement in integrating data acquisition system. Certain performance characteristics are of primary concern when designing arrays. These characteristics include array resolution, spatial aliasing and array sidelobe suppression. Every array has its directional pattern that shows such characteristics. Assuming that a monopole source is located in center, beam-patterns have been simulated varying measurement conditions such as number of sensors. array aperture size, distance between array and source, frequency of interest and so on. Sensor correction was conducted on very channel using magnitudes and phased of FRF with respect to a reference microphone channel. Then with a spiral type array, measurements have been made with two point sources of same frequency in order to investigate array resolving abilities. It is observed that higher frequency source achieves better resolution than lower one does.

• 한국전자파학회논문지
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• 제14권1호
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• pp.62-67
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• 2003

본 논문은 이동 위성통신을 위한 능동위상배열 안테나 시스템의 주요 부품 중의 하나인 빔 성형모듈 설계에 관하여 서술한다. 본 모듈은 주 신호 및 추적신호를 위한 두 개의 모듈로 구성되어 있다. 이중, 주 신호블록은 위상배열 안테나로부터 입력된 신호전력을 추적신호 블록으로 전송하는 역할을 수행하며, 추적신호 블록은 능동위상배열 안테나 시스템의 주요 기능인 추적신호의 빔 성형과 전자적 빔 제어기능을 수행한다. 또한, 본 모듈은 위상특성 및 선형이득 등의 시스템에서 요구되는 전기적 사양을 만족하며, 해당 성능의 보다 면밀한 검증을 위하여, 제작된 빔 성형모듈을 장착한 능동위상배열 안테나 시스템을 이용하여 야외구동시험을 수행하였다.