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열변형 및 주파수 모드분리를 고려한 디스크 브레이크 로터 설계
조준수(Joonsoo Cho),김민석(Minsock Kim),류남열(Namyeul Ryu),최상열(Sangyeol Choi),최진호(Jinho Choi),김용석(Yongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In order to optimally design a rotor of disc brake system, various design requirements should be considered such as braking performance, durability, thermal performance, noise characteristics, etc. Especially, thermal performance is fundamental in rotor design not only for safety but also for hot judder, and insensitive design to the brake squeal noise is vital for the customer quality in modern vehicles since it is one of the top quality issues in the field. In this paper, complex eigenvalue analysis has been performed for identifying frequencies sensitive to the brake squeal noise, and coning analysis is performed for thermal deformation. Based on those CAE analyses and DOE study, this paper presents the critical design variables for the robust squeal noise performance, and also deals with the rotor design considering the thermal deformation.
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.
브레이크 디스크 주물 화학성분 구리, 황의 함량과 동일 절대습도 조건에서 마찰계수 연관성 검토
김용탁(Yongtak Kim),김영표(Yeongpyo Kim),류남열(Namyeul Ryu) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.5
Brake corner friction output is related to the corner component system’s performance, including caliper strength, pad compressibility, disc surface condition, etc. To obtain the ideal friction output value, the interfaced components must work properly. Though we are focusing on the disc system only, there are many factors that influence the condition of the friction surface, such as cast iron chemical composition, casting production line process, disc machining process, etc. In this paper, the relation between the disc casting chemical composition, Cu, S, and friction output was investigated. Brake corner friction values were measured by a bench dynamometer machine, and the disc cast iron test combination of Cu, S was planned with a 2×2 full factorial. The relation between friction value and absolute humidity environment conditions was reviewed together, and the micro-structures of the disc were obtained to determine friction output influence from a metallographic viewpoint.
브레이크 로터 주물 화학조성 S, Cu의 함량과 마찰계수 연관성 검토
김용탁(Yongtak Kim),김영표(Yeongpyo Kim),김민수(Minsoo Kim),이새낭(Saenang Lee),류남열(Namyeul Ryu) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Brake corner friction value is related to each brake corner component system working performance. Caliper strength, pad compressibility, rotor surface condition etc. To get the expected best friction value output, each interfaced components need to work in the best condition. Even though we look at the only rotor system, there are many factors to change Rotor and PAD interface condition which makes friction force. Cast iron chemical composition, casting production line process, rotor machining process etc. In this paper, study for what kinds of relation exist between rotor casting chemical composition S, Cu and friction output. Brake corner friction values were measured by bench dynamometer machine utilizing 2x2 full factorial matrix for S, Cu combination of rotor. The relation between friction value and absolute humidity test condition were reviewed, and the rotor microstructure inspection was achieved to check any special point by metallography.