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채장범(Chai, Jangbom),김태환(Kim, Taekwan) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.6
Statistical Energy Analysis(SEA) has been considered as a Possible method for predicting responses of complex structures, especially at higher frequencies. In this paper, an SEA model of a vehicle was built using 138 energy storing subsystems connected together using 1019 Junctions. SEAM software program was used to build and calculate the model. To demonstrate the accuracy of the SEA model, predicted response levels were compared with measured levels. The source Input levels were measured at the engine mounting parts. There is good agreement between the estimated and the experimental results. This paper also identifies some dominant energy flow paths from sources. It is finally presented that the SEA model can optimize the design parameters of vehicles using model parameters and energy flow paths.
소형 임피던스 분석기를 이용한 케이블의 결함 감시 시스템
윤채원(Chai-Won Yoon),용환구(Hwan-Gu Yong),김광호(Kwangho Kim),나완수(Wansoo Nah),채장범(Jang-Bum Chae),김병성(Byung-Sung Kim) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.11
본 논문은 direct digital synthesizer, 연산 증폭기 및 이득/위상 검출기로 구성된 소형 임피던스 분석기를 사용하여 차분 주파수 영역 반사 계측을 기반으로 한 케이블 결함 모니터링 시스템을 제시한다. 제안된 시스템은 주파수 영역 반사계측을 위한 고가의 벡터 네트워크 분석기를 저비용으로 대체할 수 있으므로, 장기간 동안 다중 지점을 모니터링하는 센서 네트워크 구성이 가능하다. 이 시스템의 성능은 전원 케이블의 결함 지점을 진단하는 실험을 통해 검증하였다. This work presents a cable fault monitoring system based on the differential frequency domain reflectometry using a compact impedance analyser which is composed of a direct digital synthesizer, an op amp and a gain/phase detector with a micro controller. The proposed system can replace expensive vector network analysers for frequency domain reflectometry and therefore be deployed in sensor networks for long term multi-point cable monitoring. Effectiveness of the system is experimentally confirmed by diagnosing the status of the power cable.
김미나,채장범,박일한,김에녹,Kim, Mi Na,Chai, Jang Bom,Park, Il Han,Kim, E Noch 한국압력기기공학회 2010 한국압력기기공학회 논문집 Vol.6 No.2
In this research project, development of methodology to measure the thickness of pipes in the wide range using magnetic field. The magnetic field spreading in the sensor and the plate was modeled in the cases of the various thicknesses in plate. Based on the analysis, sensors were designed, manufactured and tested to optimize the specifications of the sensor. The sensor can be used in high temperature through calibration. And the uncertainty of the sensor was estimated.