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RISS 인기검색어
- 검색키워드
- 저자 : 장명훈(Myunghoon Jang) (검색결과 4 건)
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장명훈(Myunghoon Jang),윤동석(Dongseok Yoon),류남열(Namyeul Ryu),전주명(Jumyoung Jeon) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Brake Drum is one of the most important part of vehicle, which is used to stop the vehicle. It is usually used in rear wheel because it does not have linear output comparing to caliper with rotor system. But it is still well used in many markets due to its cheap cost and good braking performance. In this thesis, drum stiffness is mainly dealt with. Stiffness, Material, Dimension, Balance, FRF are all important elements for brake drum design, but especially stiffness is highly related to cylindricity transformation and sometimes when it is weak, it can cause many kinds of drum related noise and judder. Each key dimensions of drum were considered as control factor of drum stiffness and each key combinations of these control factors were used to compare drum stiffness which is calculated by CAE analysis using ABAQUS. Via DFSS tool, we concluded which dimension is main contributor of high stiffness drum and how we can increase drum stiffness just slightly changing each key dimensions without mass increase.
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제동시 발생하는 리어 드럼브레이크 Creak (scratching) 노이즈 개선
장명훈(Myunghoon Jang),박신(Shin Park),김선호(Sunho Kim),김성환(Sunghwan Kim) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
Creak noise is kind of scratching noise which is usually generated in drum brake system on the vehicle. When driver brakes vehicle or applies parking lever, drum brake shoe moves to the drum side to stop the vehicle. And at that time, moving shoe scratches backing plate ledge surface, and that makes scratching noise in special condition. This study presents how we can generate creak noise in the laboratory and how we can reduce it by experimental approach. Through several and various type of tests, we could generate creak noise with damage on ledge area of the backing plate in the lab and we verified tab type shoe design can reduce this scratching noise. As a result of this study, we notified how creak noise happens in the vehicle, and that tab type design shoe has good performance of ledge area damage based on lab test(rig & dynamometer equipment), and that this can reduce potential risk of creak noise in the field.
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제동시 발생하는 리어 드럼브레이크 grunt (stick-slip) noise 개선
홍일민(Ilmin Hong),장명훈(Myunghoon Jang),김선호(Sunho Kim),최홍석(Hongseok Choi) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
Grunt (Stick-slip) noise happens between rear lining and drum on braking condition while vehicle is returning to steady position after nose-dive. The study presents a new testing and analysis methods for improving brake grunt noise on vehicle. Grunt noise is called a kind of stick slip noise with below 1kHz frequency that is caused by the surfaces alternating between sticking to each other and sliding over each other with a corresponding change in friction force. This noise is typically come from that the static friction coefficient of surfaces is much higher than the kinetic friction coefficient. For the identification of the excitation mechanism and improvement of grunt noise, it is necessary to study variable parameters of rear drum brake systems on vehicle and to implement CAE analysis with stick slip model of drum brake. The aim of this study has been to find solution parameters throughout test result on vehicle and dynamo test. As a result of this study, it is generated from stick slip between rear lining and rear drum and it can be solved to reduce contact angle of lining with asymmetric and is effected not only brake drum strength but also rear brake size and brake factor.
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제동시 발생하는 리어 드럼브레이크 Grunt(stick-slip) Noise 개선
홍일민(Ilmin Hong),장명훈(Myunghoon Jang),김선호(Sunho Kim),최홍석(Hongseok Choi) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.9
Grunt(stick-slip) noise happens between rear lining and drum on braking condition while vehicle is returning to steady position after nose-dive. The study presents a new testing and analysis methods for improving brake grunt noise on vehicle. Grunt noise is called a kind of stick slip noise with below 1 kHz frequency that is caused by the surfaces alternating between sticking to each other and sliding over each other with a corresponding change in friction force. This noise is typically come from that the static friction coefficient of surfaces is much higher than the kinetic friction coefficient. For the identification of the excitation mechanism and improvement of grunt noise, it is necessary to study variable parameters of rear drum brake systems on vehicle and to implement CAE analysis with stick slip model of drum brake. The aim of this study has been to find solution parameters throughout test result on vehicle and dynamo test. As a result of this study, it is generated from stick slip between rear lining and rear drum and it can be solved to reduce contact angle of lining with asymmetric and is effected not only brake drum strength but also rear brake size and brake factor.
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