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전기차 DAS 적용에 따른 차동기어 화인 소음 저감에 대한 연구
김무석(Moosuk Kim),이현구(Hyunku Lee),홍사만(Saman Hong),강석찬(Sukchan Kang),문정환(Junghwan Moon) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
Even if the sales of electric vehicles were increasing to solve environmental problems, short driving distances and inconvenient battery charging are the most important issues. Most car makers are trying to increase battery efficiency or extend the driving distance with new technic. DAS is one of the driveline systems used to increase the efficiency by disengaging the driving friction force from wheels to reducer and motor in a 4WD electric vehicle. But when the DAS disengage the driveline, the side and pinion gears in differential gear system rotate at a high speed and make gear noise severely. In this paper, through the developing a backlash measurement device for differential gear system, analyzing the operating condition and the noise generating mechanism, the differential gear noise are improved and backlash specifications and test methods related to the noise are set up successfully.
김무석(Moo Suk Kim),이현구(Hyun Ku Lee),홍사만(Sa Man Hong),임윤수(Youn Soo Imm),이종범(Jong Bum Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Generally, excitation forces of the powertrain are transmitted through the structure paths, likewise powertrain support brackets, mounts and side members in a vehicle dynamic condition. But the vibration responses levels caused by the dynamic frequency overlap characteristics of the transfer path could have been amplifying unexpectedly and then an unintended NVH problem could happen. Therefore, it is preemptively necessary to recognize these characteristics, and try to avoid the frequencies and phase overlap. In this paper, two case study related to the transfer path natural frequency overlap have been proposed successfully. Based on this study, a new setup for the correlations between the test and analysis of the natural frequency and stiffness characteristics of the transfer path up to 1㎑ in the vehicle is proposed. And a NVH phenomenon caused by frequency overlap has been able to be predicted in early design stage.
이현구(Hyunku Lee),김무석(Moosuk Kim),황선양(Seonyang Hwang),권오준(Ohjun Kwon),강구태(Kootae Kang) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper shows a whole noise developing procedure and items for the new developed 6th speed automatic transmission. Through the planetary operating frequency analysis, predict the planetary gear noise problem. To reduce this noise, one-way clutch, input shaft length, and valve body cover shapes were changed. To develop the transfer gear and differential gear noise quality, analysis procedure and experimental tests are also done and fix the tooth tolerance specifications. And gear grinding methods are also used . Due to demands for developing and reducing the serious abnormal bearing noise, oil pump noise and torque converter noise, some special test procedures and specifications are developed and adapted. By using the acoustic camera and lazer-vibrometer, radiation noise could be handled and reduced quickly and effectively. The whole developing process and results will offer good guides to the engineers who develop the next generation transmission.
북미 6속 자동변속기 공장 EOL NVH 개발에 대한 연구
이현구(Lee, Hyun-Ku),김무석(Kim, Moo-Suk),황선양(Hwang, Seon-Yang),유동규(Yoo, Dong-Kyu),강구태(Kang, Koo-Tae),이태휘(Lee, Tae-Hwi) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.7
This paper shows a whole noise quality checking system for the new developed 6th speed automatic transmission manufactured in USA. Due to demand for manufacturing of the high NVH quality transmissions in the mass product line, some special checking system called EOL NVH is adapted. This EOL system is using vibration sensor and analysis technologies. Through adapting vibration analysis technologies and functions likewise RMS, crest factor, harmonics, peak, band and order tracking, various noise problems caused by wear, nick and deformations could be successfully detected and predicted. Therefore, automatic transmissions manufactured in the USA could get high NVH quality. The developing process described in this paper and results on EOL system will offer good guides to the engineers who built the next transmission factory.