http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고한석(Go Hansuk),이우식(Lee Usik) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, damage detection method by using the time reversal is developed to detect damage on composit structures. The time reversal was investigated for direct root between PZT and PZT, but in case of a circular PZT, lamb wave moves not only along the direct root but also another roots. The center frequency of lamb wave is kept when the lamb waves are reflected from damage. This paper presents experimental and theoretical results for the new structural health monitoring method by above features of lamb wave, and we can increase accuracy of the new structural health monitoring method by using STFT(Short Time Fourier Transform)
구조물 손상진단을 위한 Lamb 파의 시간-역전현상에 대한 실험
고한석(Go Hansuk),이창호(Lee Changho),이우식(Lee Usik) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, the possibility of time reversal phenomenon was investigated in damage detection of structure. In conventional lamb wave techniques, damage is identified by comparing the measured data (baseline signals) and the current data. But this method can lead to high false signal in the intact condition of structures due to environmental conditions of the structures. So in this studying, we investigate the possibility of damage detection in the aluminum plate using the time reversal phenomenon of lamb waves.
고한석(Hansuk Go),임종태(Jongtae Lim) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
There are 5 system area which have Rattle & Squeak noise on vehicle, those are Interior, Exterior, Thermal, Electric and Chassis system. In this paper, we would propose a new method of finding for cradle impact noise source on chassis system. By this proposal approach, we can increase efficiency of results and reduce time of finding exact position of cradle noise source. Generally, if customer’s vehicle has underbody noise such as cradle noise, customer can be worry about safety. So we should define exact position & root cause of cradle noise and fix it, before product vehicle is delivered to customer. But it’s difficult to find position of impact noise source from vehicle underbody, such as cradle, because impact noise is short time signal and it is transferred to interior through structure-bone path. To solve this kind of noise, this paper suggests a method of finding position of impact noise on cradle by using new approach.
탄성파의 시간-역전현상과 STFT 를 이용한 구조물 손상진단
고한석(Go Hansuk),이우식(Lee Usik) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The time reversal was investigated for direct root between PZT and PZT, but in case of a circular PZT, lamb wave moves not only along the direct root but also another roots. The center frequency of lamb wave is kept when the lamb waves are reflected from damage. This paper presents experimental and theoretical results for the new structural health monitoring method by above features of lamb wave, and we can increase accuracy of the new structural health monitoring method by using STFT(Short Time Fourier Transform).
차량 도어의 주파수 응답 함수 측정을 통한 BSR 성능 예측
우성근(Sunggeun Woo),고한석(Hansuk Go),김진호(Jinho Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
BSR (Buzz, squeak and rattle) noise caused by impact or stick slip vibration of interfaced parts is getting relatively important as the technology and its enabler for NVH refinement is improved and this BSR can bring about a significant warranty issue by affecting consumer’s perception of the quality of automotive product. Door module is one of the key subsystems which cause the BSR and the automotive industry has been trying to quantify the BSR performance by the method of loudness measurements in subsystem level using the standardized road profile from the vehicle level measurements. But there may be a limitation of time, cost and space on this approach which requires lots of resources such as quiet long-stroke shaker, acoustically treated chamber and road profiler to collect road profile information. Therefore, FRF method is suggested in this paper to identify the BSR contribution factors and the approach is based on FRF measurements on vehicle door module.