• Title/Summary/Keyword: 브레이크 다이나모

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Braking Force Test Evaluation Dynamometer Development of Vehicle (차량용 브레이크 제동력 평가 다이나모미터 개발)

  • Kwon, Byeong-Heon;Yoon, Pil-Hwon;Lee, Seon-Bong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.5
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    • pp.56-65
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    • 2019
  • Recently, automobiles have been developed for safety and environmental reasons. Particularly, awareness of automobile safety is changing significantly. As a result, safety systems developed by ADAS have emerged. However, the period of mass production through ADAS development and test evaluation is long. Therefore, in this paper, we develop a brake dynamometer to shorten the time required for ADAS development and test evaluation. In addition, the developed brake dynamometer satisfies the international standard JIS D-0210, and the user can evaluate the braking force by selecting test conditions and test method for each mode of ADAS. We use the ACC, LKAS, and AEB scenarios proposed in previous studies to verify the reliability of the developed brake dynamometer. The developed brake dynamometer was verified by comparing the test values and the calculated values using theoretical formulas of the proposed ADAS mode based on previous studies. In addition, it is expected that the performance evaluation of brake parts for each ADAS mode will be possible in an environment where the vehicle test of ADAS is not possible in the future.

Squeal Test Using Lab-Scale Brake Dynamometer for Pad Angle and Negative-slope (랩스케일 브레이크 다이나모 메터를 이용한 패드각도 및 음의 기울기에 따른 스퀼 소음 실험 연구)

  • Nam, Jae-Hyun;Cho, Byung-Jae;Kang, Jae-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.7
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    • pp.3158-3163
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    • 2013
  • In this study, squeal noise test was conducted by using the lab-scaled brake dynamometer. Squeal conditions with respect to the angle of the brake pads ($34^{\circ}30^{\circ}26^{\circ}$) and negative slope, were studied. Squeal frequency of the In-plane-like mode was confirmed by hammering test and finite element analysis. This Squeal mode was difficult to control by the pad angle variation. Also the squeal sound was found to be periodic signal which has higher harmonic components. Squeal noise is independent of the negative slope. It implies that squeal noise can reach the stick-slip oscillation.

Study on Development of Flexible Pad for High Speed Train Disk Brake (고속철도 디스크 브레이크의 유연 패드 개발에 대한 연구)

  • Lee, Min-Gyu;Kim, Joo-Yong;Kim, Jae-Min;Yang, Young-Min;Kim, Sang-Ho;Cho, Chong-Du
    • Journal of the Korean Society for Railway
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    • v.14 no.2
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    • pp.100-108
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    • 2011
  • This paper investigates the structural stability and reliability on improving performance of flexible brake pad used in high speed train. To this end, an improved model of flexible pad was obtained through structural analysis. Brake pad specimens were subjected to modal, stroke and endurance tests to examine the dynamic characteristics and mechanical stability. The hot spot generation with increasing rotational speed was observed on chassis dynamometer equipment and then the structurally uniform contact between the disc and pad was achieved. The temperature distribution of flexible pad was measured using the infrared camcorder. Hence, the proposed flexible pad showed the better structural stability and thermal energy emission.

A Study on Wear Life Prediction of Disk Brake Pads (디스크 브레이크 패드 수명 예측에 관한 연구)

  • 여태인
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.4
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    • pp.199-205
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    • 2002
  • This paper presents a numerical technique to analyze wear life of automotive disk brake pad, where FFT-FEM method is adopted to determine the transient temperature distribution of the disk surface. A specimen ova frictional material is tested on a small scale brake dynamometer to find the dependency of the wear rate on temperature change, from which and the temperature analysis results, given the wear test mode, wear behavior of the pad material fur the vehicle can be predicted. Numerical examples show the predicted wear life of the vehicle coincides with the manufacture's recommended time interval for replacing the pads.

The Braking Performance Evaluation of Al-MMC Brake Drum Using the Dynamometer (다아나모 실험을 통한 Al-MMC 브레이크 드럼의 제동성능 평가)

  • 윤영식;유승을;한범석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.733-736
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    • 2002
  • This study was carried out to investigate the braking performances associated with the friction coefficients and temperature fluctuations. Friction coefficient stability and maximum temperature of brake drums, made of an Al-MMC and conventional cast iron, were tested by the inertial brake dynamometer during 15 braking operations. Also the temperature distribution was analyzed by the finite element analysis(FEA). In this experiment, both lower temperature rise near the drum surface and less variation of friction coefficient, compared to those of cast iron, were observed with Al-MMC drums during braking operations.

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A study on the development of a Fe-based organic Drake lining with sponge structure for rolling stock of 150km/h train (150km/h급 비석면 스폰지형 철계 브레이크 라이닝 개발 연구)

  • 최경진;이동형;고광범;권영필
    • Proceedings of the KSR Conference
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    • 2000.11a
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    • pp.219-225
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    • 2000
  • This study is to develop a Fe-based disc brake lining with sponge structure for rolling stock of 150km/h train and to concept design with 3 groove type for brake disc reducing hot hair-crack and certainly friction coefficient. The developing brake lining would be to presumption of saving 300 million won during one year

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Robust Design of the Disc Brake Pad Shape for Reduction of Uneven Wear (디스크 브레이크의 편마모 저감을 위한 브레이크 패드의 마찰재 형상 강건설계)

  • Park, Jin-Tack;Choi, Nak-Sam
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.1
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    • pp.77-87
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    • 2012
  • In this paper, the method and its effectiveness to decrease the uneven wear of the brake pad were proposed. A finite element analysis was performed to analyze the pressure distributions on the contact surfaces. The optimum brake pad shape was determined by a robust design using the Taguchi method. The effectiveness of the optimum design was clarified by the wear tests with a dynamometer.

Robust Design of the Back-plate Shape of the Disc Brake Pad for Reduction of Uneven Wear (디스크 브레이크의 편마모 저감을 위한 브레이크 패드의 백플레이트 형상 강건설계)

  • Park, Jin-Tack;Han, Seung-Wook;Choi, Nak-Sam
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.1
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    • pp.8-19
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    • 2014
  • In this paper, a robust design of the back-plate of the brake pad to decrease the uneven wear of the pad was studied. A finite element analysis was performed to analyze the pressure distributions on the contact surfaces. Optimized back-plate shape of the brake pad was determined using the Taguchi method. The effectiveness of the robust design was clarified by the wear tests with a dynamometer.

Development of the Virtual Test Technology for Evaluating Thermal Performance of Disc Brake (브레이크 열적 성능 평가를 위한 Virtual Test 기술의 개발)

  • Choi, Bong-Keun;Park, Jong-Hyun;Kim, Mi-Ro;Ahn, Byung-Jae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.4
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    • pp.40-47
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    • 2009
  • There are many kinds of simplifications and limitations in evaluating thermal performance of disc brake using the analytic technologies which were established before. But now new virtual test technology with several advanced analytic techniques is developed to evaluate the thermal performance without any possibility of great errors that used to happen for the time-consuming analysis. As a result, it was estimated that the virtual test technology could afford to replace the physical dynamo test since the reliability of virtual test technology was reasonably verified with the existing data measured in dynamo test.

Effect of the Brake Shoe on the Brake Force of the Freight Car (화차용 브레이크 슈의 제동에 미치는 영향)

  • 최경진;이동형
    • Proceedings of the KSR Conference
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    • 2001.10a
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    • pp.125-130
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    • 2001
  • It is vary importance that stopping distance for the freight train and need to design parameter of the brake force and friction coefficient. Acoording to the brake force between shoe and wheel less than the adhesion between wheel and rail. Because of vary difference between empty and weight car of 0∼500kN, this solution was made to application for variable loaded brake system. When the V=110km/h. the emergency stopping distance of freight train is about 700m, so this study was considered on the two condition, one of the increse brake force and to be different of the increse friction coefficient on the brake shoe. It was useful increse friction coefficient. Result of study, analyze effect of the brake shoe on the brake force of the freight car and high friction coefficient were proposed. To do this, ${\mu}$=0.155${\pm}$10% when S=600m on the V=110km/h of the train, 2 groove of friction surface on the temperature distribution were considered.

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