• 제목/요약/키워드: Disk Brake

검색결과 220건 처리시간 0.035초

실험계획법과 유한요소해석에 의한 디스크 브레이크의 열변형 최적설계 (Optimal Design for the Thermal Deformation of Disk Brake by Using Design of Experiments and Finite Element Analysis)

  • 이태희;이광기;정상진
    • 대한기계학회논문집A
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    • 제25권12호
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    • pp.1960-1965
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    • 2001
  • In the practical design, it is important to extract the design space information of a complex system in order to optimize the design because the design contains huge amount of design conflicts in general. In this research FEA (finite element analysis) has been successfully implemented and integrated with a statistical approach such as DOE (design of experiments) based RSM (response surface model) to optimize the thermal deformation of an automotive disk brake. The DOE is used for exploring the engineer's design space and for building the RSM in order to facilitate the effective solution of multi-objective optimization problems. The RSM is utilized as an efficient means to rapidly model the trade-off among many conflicting goals existed in the FEA applications. To reduce the computational burden associated with the FEA, the second-order regression models are generated to derive the objective functions and constraints. In this approach, the multiple objective functions and constraints represented by RSM are solved using the sequential quadratic programming to archive the optimal design of disk brake.

자전거 브레이크에서의 디스크 로터의 형상별 열응력 해석 (Thermal Stress Analysis of Disk Rotor by Configuration of Bike Brake)

  • 한문식;조재웅
    • 한국자동차공학회논문집
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    • 제23권3호
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    • pp.287-291
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    • 2015
  • This study investigates the result of thermal stress analysis on disk rotor by classes at bike brake. In the analysis result of thermal deformation at the steady state, maximum deformations at models 1, 2 and 3 are 0.14347mm, 0.15823mm and 0.16028mm respectively. The deformation becomes larger as the field goes on from the center to the outside at disk rotor. As there are models 1, 2 and 3 in the order of maximum deformation, model 1 has safest among three models. In the analysis result of thermal stress at steady and transient states, there are models 1, 2 and 3 in the order of maximum stress. Model 1 becomes most excellent on strength and safety among three models. By using the analysis result of disk rotor model at bike disk, it is possible to design the model applied practically at the safe driving of bike.

브레이크 디스크 커버의 제동 열손상에 대한 실험적 연구 (An Experimental Study on Braking Thermal Damage of Brake Disk Cover)

  • 고광호;문병구
    • 디지털융복합연구
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    • 제13권11호
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    • pp.171-178
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    • 2015
  • 디스크 커버는 브레이크 디스크 및 캘리퍼를 보호하기 위해 설치하고, 고객에게 인도되기 직전에 제거된다. 본 연구에서 디스크 커버의 온도는 주행 시험 차량(2000cc, 디젤)을 대상으로 측정되었다. 주행 시험(120km/h-제동(0.3G)-정지-120km/h-제동(0.5G)-정지)에서 측정된 최고 온도는 디스크 커버 상부에서 $260{\sim}270^{\circ}C$이었고, 디스크 커버 주위에 상당한 변화를 보였다. 이는 고온 디스크로부터 커버로의 주요 열전달이 대류를 통해서임을 커버 주위의 온도 분포로부터 추론 할 수 있다. 즉, 마찰 제동에 의해 발생된 고온의 공기가 디스크 커버 상부까지 올라간 것이다. 그리고 주행 시험 중에 디스크 커버의 상부 영역만이 용융되었다. 디스크 커버의 두께를 0.7mm부터 1.0mm로 증가시키고, 마스킹 테이프 1장을 디스크 커버 상부 영역에 부착하였다. 그 후에 디스크 커버는 주행 시험 시 마찰 제동에 의해 형성된 고온의 공기에도 변형되지 않았다.

고속전철용 디스크 브레이크의 열탄성 마멸에 관한 수치적 연구

  • 황준태;김청균
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 1999년도 제30회 추계학술대회
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    • pp.269-275
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    • 1999
  • This paper presents the results of thermoelastic wear phenomena in ventilated disk brakes for a high-speed train using finite element method. The computed results show that the sinusoidal distortions due to non-uniform distributions of temperature profiles may lead to thermoelastic wears at the rubbing surface. This may decrease the life of a disk brake and produce micro-cracks, noise and squeals between two rubbing surfaces.

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Finite Element Analysis of Temperature Distribution and Thermally Caused Deformation in Ventilated Disk Brakes

  • Kim, Chung-Kyun
    • Tribology and Lubricants
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    • 제11권5호
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    • pp.150-155
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    • 1995
  • In order to analyze the thermal effects of the rotor models, the finite element technique was used in this study. The length of the hat was investigated as a design parameter. At the start of each brake application the disk surface temperature rapidly increases to a maximum value and then decays due to external cooling and thermal conduction to the hat. The calculated results indicate that the long length of the hat shows the minimum deformation in axial direction, which is related to the thermal problems, coned wear, vibration and noise.

CRITICAL SPEED ANALYSIS OF JUDDERING DUE TO CHANGE IN SURFACE TEMPERATURE OF DISK BRAKE

  • Kim, M.G.;Cho, C.
    • International Journal of Automotive Technology
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    • 제7권6호
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    • pp.697-702
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    • 2006
  • The change in the critical speed due to surface temperature of automotive disk brakes may be analyzed both theoretically as well as experimentally. Juddering of disk brakes is closely related to its critical speed. In analyzing the critical speed, if $\sigma$ is positive, Disk develops TEI(Thermo-Elastic Instability) resulting in juddering in disk brakes. And $\sigma$ is affected not only by the critical speed but also by the initial temperature of disk surface. As the initial temperature of the disk surface rises, the critical speed decreases and juddering is developed more easily. Also, when hot spots are developed by TEI, they show large temperature difference in small local range.

F-16 B32 전투기용 브레이크 디스크 소재의 물성특성 연구 (Characteristics of Friction Materials for Brake Disc in F-16 B32 Fighter)

  • 감문갑;김원일;김태규
    • 한국기계가공학회지
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    • 제6권3호
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    • pp.98-104
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    • 2007
  • The carbon fiber reinforced carbon composite (CFRC) materials are necessary for the advanced industries that require the thermal resistance. And the development and research for CFRC has been in progress in the field of aerospace and defense industry. CFRC have several advantages and special properties such as excellent anti ablation, outstanding strength retention at very high temperature, high heat capacity and thermal transport, high specific stiffness and strength, and high thermal shock resistance. They have been used as aircraft brake, rocket nozzle, nose cones, jet engine turbine wheels, and high speed craft. Since the technology related to CFRC was prohibited from importing and exporting, we developed our own technology to produce F-16 B32 brake disk made out of CFRC, and then we performed various tests to observe the characteristics of CFRC-based brake disk developed in this study in view of density, strength, friction, specific heat, and heat conductivity.

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경주용 자동차 브레이크 디스크 형상에서의 열 응력 및 구조 해석에 관한 융합 연구 (A Convergent Investigation on Structural Analysis with Thermal Stress at the Shape of Brake Disk for Racing Car)

  • 오범석;조재웅
    • 한국융합학회논문지
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    • 제11권6호
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    • pp.209-213
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    • 2020
  • 본 연구에서는 경주용 자동차에서 기존에 사용 중인 형상을 가진 모델 A와 경량화를 한 모델 B를 설계하고 열 변형과 열응력을 동반한 구조해석을 하였다. Model A가 Model B에 비하여 최고온도가 낮음을 보인다. 다른 냉각 조건이 주어지지 않고 디스크의 형상에 따른 냉각성능은 Model A가 더 뛰어남을 알 수 있다. Model A가 Model B에 비하여 거의 2배 이상으로 그 열응력이 낮아져 내구성면에서도 우수함을 알 수 있었다. 응력이 가장 크게 나타나는 부분은 형상에 관계없이 허브와 접합되는 구멍으로 나타났다. 본 연구에서의 해석결과는 실제 자동차 브레이크 디스크의 형상을 설계하는데 있어서 유용하다고 보인다. 본 연구에서 얻은 해석 결과는 실제적으로 경주용 자동차 브레이크 디스크의 강도를 파악하는 데에 적용될 수 있다. 경주용 자동차 브레이크 디스크의 해석 결과를 이용함으로서, 본 연구가 미적인 설계 및 해석이 적용된 융합 연구라고 보여진다.

영구자석을 이용한 새로운 MR 브레이크의 해석 (Analysis of a Novel MR Rotary Brake with Permanent Magnet)

  • 윤동원;박중호;손영수;박희창;박철훈
    • 대한기계학회논문집A
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    • 제33권1호
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    • pp.34-41
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    • 2009
  • In this paper, a novel MR brake with permanent magnet is developed. This system consists of rotary disk, permanent magnet, spring and MR fluid. Permanent magnets are attached to the rotary disk and moves in the direction of radius. The magnets are linked to rotor axis by spring. As rotation speed increases, the magnets move outward from the center of the system by centrifugal force in the MR fluid. A proper design of stator or case makes the system have unique torque characteristics. The research is performed like following procedures. First, the electromagnetic characteristic of the system is analyzed using Maxwell. Next, torque is calculated using the results of the electromagnetic analysis. Finally, the performance of various types of the brake systems are investigated and compared with each other.

EV 브레이크 경량화를 위한 하드아노다이징 부의 성능 평가 (Quality Evaluation of Hard Anodizing Zone for Lightness of the EV Brake Disks)

  • 박창선;성백섭;차용훈;김재열;이재희;박용순;강대진
    • 한국생산제조학회지
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    • 제21권1호
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    • pp.90-94
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    • 2012
  • This study evaluates the strength of surface treatment parts using the hard anodizing method to the aluminum alloy brake disks. In order to achieve weight reduction of vehicles, Eco-friendly cars parts of the high-quality and competitive price is to equip. Especially while pursuing parts of weight reduction, it has to maintain the strength of the surface of the brake by nature. To enhance surface strength of aluminum alloy, we use hard anodizing technology in the surface treatment. This study is resulted of 3 times greater the hardness value of the hard anodized specimen than the aluminum alloy specimen for the lightweight parts of EV brake disk