• Title/Summary/Keyword: Disk-Pad Brake

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Development of the FE(Finite Element) model for analysing the squeal noise of wheel brake system (휠 제동 장치의 스퀼 소음 해석을 위한 해석 모델 구축)

  • Cha, Jung-Kwon;Park, Yeong-Il;Lee, Dong-Kyun;Cho, Dong-Hun;Kim, Ki-Nam;Beak, Jin-Sung
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.1407-1412
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    • 2008
  • Squeal of disk brake is a noise and self excited vibration with frequency range of 110Khz cause by the friction force between the disk and the pad of the automobile. Passengers in a cehicle feel uncomfortable. In this paper modal analysis of wheel brake system was performed in order to prediction of squeal phenomenon. It was shown that the prediction of system instability is possible by FEM. finite element model of that brake system was made. Some parts of a real brake was selected and modeled. The normal mode analysis method performs analyses of each brake system component. Experiment of modal analysis was performed for each brake components and experimental results were compared with analytical result from FEM.

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Development of Sintered Friction Material for High Speed Train (고속 전철용 소결 마찰재료 개발)

  • 김기열;김상호;이범주;조정환
    • Proceedings of the KSR Conference
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    • 2002.10b
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    • pp.779-786
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    • 2002
  • The Friction Brake Pad of High Speed Train is the most important parts in brake system, which is usually made of Cu-based Sintered friction material. This study has been carried out about the formulation effects of sintered friction material and made lots of sample brake pads. Then, we have done the performance test of the developed product by using full scale inertia Dynamo-meter. This performance test (braking speed 300km/h) was conducted as GEC Alsthom Standard test procedure and High Speed Brake Test (braking speed 350km/h) was done at "Poli" in Italy. The friction properties of this product was almost identical with the brake pad which is currently used to TGV. And the temperature of brake disk on braking speed 350Km/h was a little higher.

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Influence of External Air Velocity for Tribological Characteristics between Sintered Friction Material and Disk (외부 공기속도 변화에 따른 소결마찰재와 디스크간 마찰특성)

  • Kim, Young-Kyu;Kim, Sang-Ho;Kwon, Seok-Jin;Chung, Su-Young;Lee, Hi-Sung
    • Proceedings of the KSR Conference
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    • 2011.10a
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    • pp.975-985
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    • 2011
  • Cu-Matrix sintered brake pads and low alloyed heat resistance steel are most applied to basic brake system for high energy moving machine. In this research, we analyzed tribological characteristics for influence of air velocity between disk and pad. At low brake pressure with air flow, friction stability was decreased due to no formation of tribofilm at disk surface. But there are no significant change of friction coefficient at all test conditions. Wear rate of friction materials were decreased with increasing of air flow velocity. In result, air flow velocity influenced friction stability, wear rate of friction materials and disk but not friction coefficient.

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Influence of Inertial Mass on Tribological Characteristics between Sintered Friction Material and Disk (관성에 따른 소결마찰재와 제동디스크간 마찰특성 연구)

  • Lee, Jong Seong;Kang, Bu Byoung;Lee, Hi Sung
    • Tribology and Lubricants
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    • v.29 no.2
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    • pp.98-104
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    • 2013
  • Cu-matrix-sintered brake pads and heat-resistant low-alloy steel are commonly applied to basic brake systems in high-energy moving machines. We analyzed how the tribological characteristics are influenced by the inertial mass. A high inertial mass decreased the friction coefficient by about 15% compared to a low inertial mass under all velocity conditions. The wear rates of the friction materials increased with the inertial mass. Thus, the inertial mass influences the friction coefficient and wear rate of the friction materials and disk but not the friction stability.

A Study on the Temperature Measurement at the Disk Brake of a High-Speed Rail Transit by the Non-Contact Method (비접촉 방법에 의한 고속철도 디스크 브레이크에서의 온도측정에 관한 연구)

  • 이광재;전필수;유재석;이종화;최강윤;김석원
    • Proceedings of the KSR Conference
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    • 2002.10b
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    • pp.820-825
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    • 2002
  • As the speed of rail transit is higher, it is very important to secure the safety and confidence of the braking device and in the point of view, by means of the rise of the temperature from the friction between the disk and pad which are the actual part of a braking system, the damage of brake disk is the main cause to lose the safety of braking device. Therefore, in this study, to predict the danger of a disk brake and to know its max. temperature in the train service the module of a temperature measurement by the non-contact method was developed.

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Axisymmetric Temperature Analysis of Ventilated Disk using Equivalent Parameters (등가상수를 이용한 벤트레이트 디스크의 축대칭 온도 해석)

  • 여태인
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.1
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    • pp.137-142
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    • 2003
  • In automotive brake systems, the frictional heat generated can cause high temperature at the interface of rotor and pad which may deteriorate the material properties of the sliding parts and can result in brake fade. Conventionally, a pie-shaped 3-dimentional model is adopted to calculate temperature of ventilated disk using finite element method. To overcome the difficulties in preparing 3D finite element model and reduce the computational time required, the ventilated rotor is to be analyzed, in this study, as an axisymmetric finite element model in which, taking into considerations the effects of cooling passages, a homogenization technique is used to obtain the equivalent thermal properties and boundary conditions for the elements placed at the vent holes. Numerical tests show the proposed procedure can be successfully applied in practice, replacing 3-dimensional thermal analysis of ventilated disk.

A Study on the Braking Characteristics for Some Non-Asbestos Kevlar Brake Pad Materials (비석면 케블라 마찰재의 제동특성에 관한 연구)

  • Chung, D.Y.;Chung, B.K.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.2 no.5
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    • pp.41-47
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    • 1994
  • An optimal brake pad must have stable friction, low wear and least amount of squeal. In this study, the friction, wear and squeal behavior of some non-asbestos Kevlar materials have been evaluated experimentally. Four specimens with different formulations and a pin-on-disk machine were used for this study. To determine the role of each component in friction and squeal of a brake pad, statistical correlations have been obtained and discussed. The components tested were : Kevlar, Steel Powder, Barium Sulfate and fillers combined by Resin.

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A Study on Friction Characteristics for Motorcycle Disk Using Taguchi Experimental Design (다꾸지 기법에 의한 이륜자동차 브레이크 디스크의 마찰특성에 관한 연구)

  • Juen, H.Y.;Ryu, M.R.;Lee, S.J.;Park, H.S.
    • Journal of Power System Engineering
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    • v.10 no.3
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    • pp.67-72
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    • 2006
  • The effect of manufacturing parameters on wear and improve cooling of motorcycle break system was studied using a disk-on-pad type friction tester. Such parameters conditions have an effect on the wear and improve cooling factor such as applied load, sliding speed, frictional time and number of ventilated disk hole. However, it is difficult to know the mutual relation of these factor. In this study, the wear and cooling characteristics using design of experiment containing 4 elements were investigated for an optimal condition for the best motorcycle disk break system employing Taguchi robust experimental design. From this study, the result was shown that vents have an effect on convection area improving more cooling ability and reduced wear of the disk.

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Numerical Study on the Hot Spots of Friction Surface in Disk Brakes (디스크 브레이크 마찰표면의 적열점에 관한 수치적 연구)

  • Kim, Chung-Kyun;Cho, Seung-Hyun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.11
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    • pp.1692-1696
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    • 2004
  • This paper presents the thermally induced hot spot characteristics of rubbing surface in the friction pad disk brake. During the braking period, the rubbing surface with irregular asperities that are strongly engaged in rough surface, wear, and deformed surface due to a friction heating may produce an irregular distorted geometry of the disk surface. The tribological interactions between the disk and the pads are unstable if the contact stress is severe, in which the irregularity develops the contact pressure distribution, leading eventually to localized contact, high temperature and formation of hot spots. The computed results of contact spots that are simulated using a coupled thermal-mechanical analysis present sinusoidal distortions and localized extrusions of the disk surface, which are strongly related to a hot spot in the practical disk brake.

Development of an Aircraft Hydraulic Brake Assembly with a Self-gap-adjuster (자동 간극 조절기를 갖는 항공기용 유압식 브레이크 조립체 개발)

  • Yi, Miseon;Song, Won-Jong;Kwon, Jun-Yong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.23 no.5
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    • pp.444-451
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    • 2020
  • This study was conducted to develop the hydraulic brake assembly for MUAV(Medium-altitude Unmanned Aerial Vehicle). The brake assembly has the self-gap adjuster which performs to maintain a constant gap between the piston and the disk, even if the friction pad wore down. The function of adjuster helps to keep the brake-reaction speed constant and prevent the unnecessary abrasion of the wear pad during the life of the brake assembly. The development of the aircraft hydraulic brake assembly with the self-gap-adjuster in this paper is the first ever in South Korea. The concept of the mechanism was defined and the formula which is necessary to calculate the friction force was set up in the paper. The tester was invented for the functional test and the proper operation of the self-gap-adjuster was confirmed through the test. Dynamo tests and flight tests were also carried out to verify the braking performance of the brake assembly.