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- 저자 : 이병로(Byoungro Lee) (검색결과 4 건)
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차량 내장재 재료간 친화력 관점의 BSR Noise에 대한 시험적 평가 및 고찰
김진호(Jinho Kim),이병로(Byoungro Lee),고찬희(Chanhee Ko) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
자동차의 성능과 기술이 점차 발전함에 따라 차량의 정숙성은 진동, 소음 분야의 연구로 많은 발전을 이루었고, 이러한 기술적 발전은 파워 트레인, 구동소음 그리고 공력소음 등과 같은 주 소음원들을 크게 개선시켰다. 이로 인해 기존에 대두 되지 않았던 각 내장 부품간의 마찰 및 간섭 또는 품질 문제 등으로 야기되는 BSR(Buzz Squeak Rattle)과 같은 소음이 상대적으로 부각되고 있다. 따라서, 본 연구에서는 차량 내장재로 사용되는 재질들 간의 BSR 정도를 확인하기 위해 두 재질을 서로 닿게 한 뒤 저 소음 가진기(Silent exciter)로 가진 평가하는 시험 방법을 제시하고, 음질 평가에 대한 분석방법 중 하나인 라우드니스(Loudness)를 이용하여 다양한 재질에 대한 BSR평가 방법을 시도하였다.
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자동차용 고난연 플라스틱 부품을 위한 최적의 난연제 조합 연구
천인숙(Insook Chun),정영일(Youngill Jung),이병로(Byoungro Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
As the demand for electric vehicles (EVs) and change to EVs increase rapidly, the mileage during a single charge has emerged as the competitiveness of EVs. And the use of plastic continues to increase due to the need for weight reduction to improve fuel economy. According to increasing the high voltage parts including battery packs, it is necessary to develop plastics that can provide high flame resistant up to UL94, V-0 rating while maintaining their compounding properties. The DFSS (Design for Six Sigma) tool was used to select suitable alternatives among non-halogen flame retardants instead of halogen flame retardants limited in use due to human hazards and environmental problems, and to find the optimized combination between plastic and flame retardant that satisfies the required properties of plastic. In general, non-halogen flame retardants are known to be more expensive, require a large amount of use depending on the type and have disadvantages in coloring or compounding. The increase in content leads to a decrease in plastic compounding properties. Therefore, it is very important to understand the properties of various flame retardants and to confirm the optimized combination between plastic and flame retardant. IDDOV methodology of DFSS successfully derived an optimized combination through test and verification.
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Analysis of hill road vibration for 3cylinder powertrain
Jungwoog Sun(선정욱),Namcheol Kim(김남철),Dalsik Kim(김달식),Byoungro Lee(이병로) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
At the hill road, during the launch, we can get the severe body vibration such as seat track, steering wheel and even interior noise. Especially for the 3cylinder, it could be worse than 4cylinder due to the 1<SUP>st</SUP> order imbalance. It means, in the case of 3cylinder, there are two kinds of sources, 1<SUP>st</SUP> and 1.5<SUP>th</SUP> orders. This study deals with assessment process for root cause. First step is to define the source - higher axle torque and imbalance level. Higher axle torque at the hill can make higher tractive road load and input force to the engine mount. Measured axle torque characteristic well matches with seat track vibration. Engine 1.5<SUP>th</SUP> order gas torque fluctuation at the hill is also much higher than at the flat road. Another source is 1st order imbalance which is 3cylinder specific issue. Second step is to look for the path – engine mount stiffness change and powertrain rigid body mode. Engine mount stiffness increased at the hill due to the higher axle torque. It can change powertrain rigid body mode at hill with stiffer engine mounts which can be increased up to max axle torque, or max input source. Additionally, through the 12DOF analysis using measured mount stiffness under the hill road condition, yaw mode at the hill is closed with issued frequency for the 1<SUP>st</SUP> order. So, powertrain rigid body mode could be one of the reason to increase the body vibration at the hill. Regarding body sensitivity, there is no changes even for the higher, almost double mount stiffness. However, it does not exactly reflect the hill road condition during the test. Further study is required. Therefore, source wise, we need to check the powertrain rigid body mode and higher gas torque fluctuation at hill. Path wise, we should check the engine mount stiffness change at the hill.
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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.
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