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조정호,이중재,배승환,이용기,박경배,김용준,문세민,Cho, Jungho,Lee, Jungjae,Bae, Seunghwan,Lee, Yongki,Park, Kyungbae,Kim, Yongjun,Moon, Semin 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
The importance of emotional quality of car is getting higher in these days. Noise takes great portion in emotional quality because it is detectable problem with just a few rides. The sources of car noise during operation are various and the related technical issues are vast. Sometimes weldments of auto body are referred as the source of noise and the suspicious weldment shows unsatisfactory welding quality in most cases. In this research, cases of noise making weldments are investigated to figure out the solution for welding quality improvement. They are categorized into several groups in according to the inferred types of the error source then appropriate solutions are suggested. Auto body has weldments of resistance spot welding and gas metal arc welding in general. Therefore the solutions are suggested as adjustment of welding process variables and related machineries. Inevitable error source is also referred which is originated from thermal expansion rate difference between ultra high strength steel and mild steel. This new approach is validated through simple calculation then more concrete investigation with numerical analysis is remained as further works to be done.
강준구(Kang JunGoo),이도행(Lee DoHaing),이광현(Lee KwangHyun),안병호(An BeungHo),문세민(Moon SeMin) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Recently, BSR noise has becoming an important issue in quality evaluation of an automotive vehicle. The technology of BSR noise inspection and evaluation has been improved to develop high quality an automotive vehicle. It is important to identify noise sources for reducing noise. To identify noise sources, an acoustic camera has been widely used with beamforming technology. A panoramic acoustic camera is suitable for locating BSR noise sources in a car because the camera can cover the whole interior noise source at the same time. It is field of view field of view is 360 degrees. In this paper, we developed a panoramic digital MEMS acoustic camera for detecting BSR noise source and measuring a noise in a car. In addition to experimentally investigated about how to automatically recognize BSR noise sources using statistical analysis of the beam power data and display whether noise.