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BSR(Buzz, Squeak, Rattle)이음 발생 메커니즘 기본 원리와 시험평가 방법
최성욱,안성철,이강덕,Choi, Sung uk,Ahn, Sungcheul,Ih, Kang Duck 한국음향학회 2018 韓國音響學會誌 Vol.37 No.5
차량 주행 성능이 정숙화되고, 고객의 감성 품질에 대한 기대치가 높아지면서, 주행 중에 불규칙으로 발생하는 이음에 대한 개선 연구가 다양하게 수행되고 있다. 자동차에서 이음은 인접한 부품간의 접촉면에서 발생한다. 접촉면에 진동 또는 힘 등의 외력 작용하면, 접촉 표면 사이에 물리적인 상호작용이 발생되어 이음이 발생하는 것이다. 본 논문에서는 지난 10여년 간 자동차에서 발생되는 이음 현상을 관찰하고, 개선하기 위한 연구를 수행하면서 정리한 것으로 이음의 종류와 발생 기본 원리를 개념적으로 설명하고자 한다. 이를 통해, 향후 자동차뿐 아니라 다른 산업계에서도, BSR(Buzz, Squeak, Rattle) 관련 개선 연구를 진행 하고자 하는 연구자에게 이음 현상을 파악하고, 개선안을 도출 하는 생각을 틀을 제공하여, 보다 향상된 연구가 진행될 수 있게 되길 기대한다. Various studies have been conducted to improve the BSR (Buzz, Squeak, Rattle) noise generated irregularly while the vehicle is running. In vehicle, When an external force such as vibration or force flows into the contact surface, BSR noise is generated at the contact surfaces of nearby components. In this paper, BSR conceptually explain the kind of noise generation mechanisms and the basic principles of generation, which have been proven by observing and improving noise phenomena in automobiles over the last 10 years. Through this, it is expected that researchers who want to study BSR related improvement research not only in automobiles but also in other industries, It will be able to understand the BSR phenomenon and provide a framework for thinking out improvement ideas and to carry out further research.
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최성욱(Seonguk Choi),이학주(Hark ju Lee),안성철(Sungcheul Ahn),구자성(Jaseong Gu) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Various noises occurrence during the vehicle glass up & down tests are difficult to characterize and improve due to not to be quantitative analysis even though the customer complaints are frequent reported on IQS and QIR. In order to solve the problems Head acoustic, ArtemiS used to search the points and improve Sound Quality Evaluation. Design guide lines for improving such problems are proposed at this study.
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이백희(Baekhee Lee),곽민혁(Minhyuk Kwak),김영식(Yeongsik Kim),안성철(Sungcheul Ahn) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
The present study developed Logistic regression models for discrimination of seat stain degrees. Seat stains have been qualitatively evaluated by a tester using gray scale (G/S) chart (1 ~ 5 points), but quantification of seat stains is needed due to inter-tester variability (e.g., visual acuity, color preference) and intra-tester variability (e.g., condition, feeling). To quantify seat stain degree, a driver’s lower body shaped-seat stain machine was developed for considering real ingress/egress conditions. Seven leather seats and 14 fabric seats, selected for considering full coverage of Lab color space in seat color dimensions, were contaminated using soil cloth (E128), and were measured color difference (ΔE) using color-difference meter. Ninety six ordinal Logistic regression (logit model) model candidates were developed, and then optimal models for leather and fabric seat were selected considering discriminability for 4.5 ~ 3.5 of G/S and %concordant (leather: 95.2%, fabric: 96.7%). Logistic discriminant methods developed in the study can contribute to quantification of seat stain degrees and reduction of customer’s satisfaction.
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장시간 주행 허리 통증 예방을 위한 시트 Lower-Thoracic Support (LTS) 기술 개발
이백희(Baekhee Lee),곽민혁(Minhyuk Kwak),김영식(Yeongsik Kim),안성철(Sungcheul Ahn) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The present study analyzed effectiveness of seat lower-thoracic support (LTS) technology for fundamental prevention of low back pain in long-term driving. A LTS was applied to T10 ~ T12 spine area on seat back by integrating with air cell in-/deflation system. Spine posture bending rates of non-lumbar and LTS were measured and compared by applying a 5-step spine posture estimation method (S1. non-lumbar support spine posture measurement, S2. optimal/maximum LTS spine posture measurement, S3. marker projection to spine, S4. spine posture estimation, S5. spine posture bending rate calculation). Posture and comfort satisfactions of non-lumbar and LTS for one-hour driving were evaluated per 5 minutes by eight seat experts using questionnaire with ten-point scale (0: extremely dissatisfied, 5: moderate, 10: extremely satisfied). The LTS seat makes bended-spine posture maximum 44% erect compared to non-lumbar seat. Posture and comfort satisfaction of LTS were higher 1.5 ~ 2.8 times compared to those of non-lumbar. The LTS can contribute to making/maintaining erect-sitting posture for prevention of lower back pain in long-term driving.
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