• Title/Summary/Keyword: Brake force

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Analysis on the Squeal Noise of Wheel Brake System for Tilting Train (틸팅차량용 휠 제동장치의 스퀼 소음 해석)

  • Cha, Jung-Kwon;Park, Yeong-Il
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.1
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    • pp.98-105
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    • 2010
  • Squeal, a kind of self-excited vibration, is generated by the friction between the disc and the friction materials. It occurs at the ending stage of the braking process, and radiates and audible frequency range of 1 kHz to 10 kHz. Squeal is generated from unstability because of the coupling between the translation and rotation of the system. This instability is caused by the follower force and follower force is normal component of the friction force. In this paper modal analysis of wheel brake system was performed in order to predict the squeal phenomenon. It was shown that the prediction of system instability is possible by FEM. A finite element model of that brake system was made. Some parts of a real brake was selected and modeled. Modal analysis method performs analyses of each brake system component. Experimental modal analysis was performed for each brake components and experimental results were compared with analytical results from FEM. To predict the dynamic unstability of a whole system, the complex eigenvalue analysis for assembly modeling of components confirmed by modal analysis is performed. The finite element models of the disk brake assembly have been constructed, and the squeal noise problems have been solved by complex eigenvalue analysis. The complex eigenvalue analysis results compared with real train test.

Haptic Experimentation for Single Degree of Freedom Force Output Joystick using Hybrid Motor/Brake Actuator

  • Jinung An;Kwon, Dong-Soo
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.171.1-171
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    • 2001
  • This paper describes the design and implementation of a new type of a force reflective joystick. It has single degree of freedom that is actuated by motor and brake pair. The use of motor and brake allows various objects to be simulated without the stability problem and related safety issues involved with high torque motors only. The joystick performance is measured by its ability to simulate various test objects. Simple test objects are modeled as a benchmark test of the system´s performance and to evaluate different control approaches for hybrid motor/brake actuator. The force output joystick is capable of simulating forces in a variety of virtual environments. This device demonstrates the effectiveness of a hybrid motor/brake haptic actuator.

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Dynamic Instability of a Disc Brake Pad under Distributed Friction Force (분포마찰력을 받는 디스크 브레이크 패드의 동적 불안정)

  • Oh, Boo-Jin;Ryu, Bong-Jo;Yim, Kyung-Bin;Sugiyama, Yoshihiko;Ryu, Si-Ung
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.665-670
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    • 2000
  • The paper presents the dynamic instability of a disc brake pad subjected to distributed friction forces. A brake pad can be modeled as a beam with two translational springs. The study of this prototypical model is intended to provide a fundamental understanding of disc brake pad instabilities. Governing equations of motion are derived form energy expressions and their corresponding solutions are obtained by employing the finite element method. The critical distributed friction force and the instability regions are demonstrated by changing two translational spring constants. Finally, the changes of eigen-frequencies of a beam determining instability types are investigated for various combinations of two spring constants.

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Discussion of the relationship between adhesion force and braking force in slip condition (제동시 점착력과 제동력의 관계에 대한 고찰)

  • Kim, Young-Guk;Kim, Seog-Won;Mok, Jin-Yong;Kim, Ki-Hwan
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1005-1011
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    • 2007
  • The brake system of train must posses the large braking effort in order to stop the train safely within the limited traveling distance. But, the excessive braking effort has been deteriorated the ride comfort due to high level of deceleration and jerk, and sometimes occurred the skid, because the applied braking force exceeds the allowable adhesive force. This skid causes not only to increase the stopping distance but also to deteriorate the safety of train and damage the rail surface by wheel flat. In the present paper, the braking force for disc brake of Korea High Speed Train (HSR350x) was measured through on-line test and the adhesion force was estimated by using the analytic model in the skid condition. Also, we have discussed the relationship between the actual disc brake force and the adhesion force in real skid condition.

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Tractive Force Estimation in Real-time Using Brake Gain Adaptation (브레이크 게인 적응기법을 이용한 종방향 타이어 힘의 실시간 추정)

  • ;;Karl Hedrick
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.214-219
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    • 2003
  • This paper includes real-time tractive force estimation method using standard vehicle sensors such as wheel speed, brake pressure, throttle position, engine speed, and transmission carrier speed sensor. Engine map, torque converter lookup table, shaft torque observer, and brake gain adaptation method are used to estimate the tractive force. To verify this estimator, measurement which uses strain-based brake torque sensor and estimation results are presented. All results was performed using a real vehicle in a real-time.

A Study on a Fuzzy Controller for the Electronic Braking Force Distribution System (전자식 차량 제동력 배분 시스템을 위한 퍼지제어기의 연구)

  • 김승대;김훈모
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.6
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    • pp.220-229
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    • 2000
  • In the brake systems a proportioning valve which reduces the brake pressure at each wheel cylinder for anti-locking of rear wheels is closely related with the safety of vehicles. But, it is impossible for a present proportioning valve to exactly control brake pressure because mechanically it is an open loop control system. So, in this paper we describe a electronic brake pressure distribution system using a fuzzy controller in order to exactly control brake pressure using a close loop control system. The object of electronic brake pressure distribution system is to change an cut-in pressure and an valve slop of proportioning valve in order to obtain better good performance of brake system than with mechanical system.

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A Study on Modular Design of Brake System and Application Method for Small-Medium EV Architecture (제동시스템 모듈러 설계 및 중소형 EV 아키텍처 적용 방안에 관한 연구)

  • J. H. Shim;U. H. Shin;S. R. Hwang;J. H. Lee;W. S.Yim;Y. J. Woo
    • Journal of Auto-vehicle Safety Association
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    • v.15 no.3
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    • pp.27-33
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    • 2023
  • Electric vehicles are widely produced from many car manufacturers around the world instead of internal combustion engine vehicle in order to respond a variety of environmental regulations. Also, they are applying for modular design method to develop plenty of the vehicles. And, both of these two issues will be an important trend to lead the future global automobile industries for a long time. In this paper, new brake architecture concept is proposed in order to respond to such a situation. First, physical interfaces between brake system like caliper, disc and other counter-parts are established for modular assembly. Second, we analyze effective factors of brake system for electric vehicles which need to reflect vehicle specifications such as total vehicle weight. Here, we consider ideal brake force by critical deceleration. Third, we simulate accumulated regenerative brake energy for two main driving modes to confirm to effectiveness for a variety of Electric Vehicle. Finally, we hope that it contributes to implement brake architecture for the development of Electric Vehicle platform through such a study.

A Study on the Application Method for Hydraulic Brake System of Urban Transit System (도시철도차량 유압제동의 적용방안 연구)

  • Lee Woo-Dong;Kim Gil-Dong;Shin Jeong-Ryol
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.897-902
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    • 2004
  • The hydraulic brake system is recently apply to the AGT system such merit as installation is convenient and brake force is stronger than pneumatic brake system. The hydraulic brake system consist of brake operating unit, electronic control unit, air compressor and pneumatic/hydraulic tranducer. The components of it are controlled and designed to perform the function of brake system. Therefore, This paper design and the hydraulic brake system and propose the derection of development for Urban Transit System.

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A Study on the Design of Pneumatic/Hydrauric Brake System for Automatic Guideway Transit (경량전철시스템의 공유압제동장치 설계에 관한 연구)

  • Lee, Woo-Dong
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.344-346
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    • 2002
  • The pneumatic/nydraulic brake system is recently apply to the AGT system such merit as installation is convenient and brake force is strong or than pneumatic brake system. The pneumatic/ hydraulic brake system consist of brake operating unit, electronic control unit, air compressor and pneumatic/hydraulic tranducer. The components of it are controlled and designed to perform the function of brake system. Therefore, This paper design and the pnuematic/hydraulic brake system and propose the derection of development for AGT system.

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A Study on the Application Method of Hydraulic Brake System for Advanced EMU (차세대전동차에 유압저동 적용방안 연구)

  • Lee, Woo-Dong
    • Proceedings of the KIEE Conference
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    • 2005.04a
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    • pp.259-261
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    • 2005
  • The hydraulic brake system is recently apply to the AGT system such merit as installation is convenient and brake force is stronger than pneumatic brake system. The hydraulic brake system consist of brake operating unit, electronic control unit, air compressor and pneumatic/hydraulic tranducer. The components of it are controlled and designed to perform the function of brake system. Therefore, This paper design and the hydraulic brake system and propose the detection of development for Urban Transit System.

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