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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.
엔진 마운트의 interm 브라켓 공진 주파수 target 설정에 관한 연구
선정욱(Jungwoog Sun),우성근(Sunggeun Woo),전병근(Byounkeun Jeon),김달식(Dalsik Kim),강신남(Shinnam Kang) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.10
When developing engine mount, interm mount bracket 1st resonance is critical to make sound quality better or worse. So, at the initial stage of development, we need to consider some design parameter to setup the target of interm bracket 1st resonance. Especially, 3cylinder interm bracket guideline is not well known. So, this paper deals with some important sensitivity which should be considered during the development of vehicle. From source to interior side, we should know the component sensitivity like body sensitivity p/F or bracket gain etc. Through this paper, we could get the knowledge of design guideline and key consideration points.
선정욱(Jungwoog Sun),우성근(Sunggeun Woo),황태진(Taejin Hwang),이병로(Byoungro Lee) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Sometimes vehicle has severe firing order booming noise at high rpm. Normally, it is caused by powertrain excitation source due to high mechanical input force. So, we could think high rpm booming noise is caused by structure borne noise through the engine mounts or cradle. However, engine acoustic radiation noise also could be a main contributor to the booming noise. This study deals with experimental assessment of “air-borne” high rpm booming noise. First step is structureborne portion define. Through the transfer path analysis for all engine mounts and decouple test, we can conclude that structure-borne portion is very small. Second step is to define air-borne path. When we reduce engine radiation noise, booming noise is improved as well. Interior cabin wise, acoustic cavity mode at issued frequency is defined. Panel contribution analysis shows windshield glass to drive ear path is most sensitive path. Some insulation treatment to block the path between windshield glass and drive ear, we can get the improvement as well. Therefore, this study shows how to access and define about “air-borne” high rpm booming noise through the experiments.