• Title, Summary, Keyword: 브레이크 시스템

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Fluid-Structural Analysis of Circumference Pressurization type Butterfly Valve according to Pressurization Distance (무어링 윈치 브레이크의 형상 변경에 따른 제동력과 강도 해석)

  • Sin, Jae-Myung;Han, Dong-Seop;Han, Geun-Jo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.407-409
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    • 2010
  • The brake system is very important part of the machine operating system of machine. If the machine does not stop during operation, accidents and facility damage, loss of life can cause. This ship is also in the same. In this study, After we had to change the original shape for the braking force improvement of the Mooring winch brake system, we analyzed the braking force and structural stress analysis of the changed Mooring Winch.

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Design of Small Wind Power System DC Voltage Controller for Over-Voltage Protection through Dynamic Brake Resistor at Over Wind Speed Condition (소형풍력 발전시스템의 과풍속 조건에서 제동 저항을 통한 과전압 방지 DC 전압 제어기 설계)

  • Yang, Byung-Ik;Song, Seung-Ho;Lim, Duk-Jin
    • Proceedings of the KIPE Conference
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    • pp.91-92
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    • 2017
  • 풍력 발전 시스템에서 정격 풍속 이상의 바람에 대응하기 위해서는 일반적으로 전기적 브레이크와 기계적 브레이크가 요구된다. 기계적 브레이크는 상대적으로 응답성이 느리며 그 시간 동안 발전기 rpm 증가에 따른 DC전압 상승에 대응하는 전기적 브레이크의 역할이 시스템 안정성에 있어 매우 중요한 요소이다. 전기적 브레이크 중에서도 소형풍력 발전시스템에서는 DB(Dynamic Brake)저항을 통해 부하를 걸어주는 방식이 주로 쓰인다. DB 저항 구동에 있어 히스테리시스 루프에 기반한 PWM제어가 일반적으로 통용되는 방식이다. 이러한 방식과 비교하여 제어 안정성, 전압 오버슈트 등의 면에서 우수한 DB저항 제어 방식을 제안하며 히스테리시스 방식과 과도상태 정상상태 특성 비교 및 성능 분석을 시뮬레이션 결과를 통해 제시한다.

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Performance Analysis and Test of the Small Piezoelectric-Hydraulic Pump Brake System (소형 압전유압펌프 브레이크 시스템의 성능해석 및 실험)

  • Hwang, Yong-Ha;Hwang, Jai-Hyuk;Nguyen, Anh Phuc;Bae, Jae-Sung
    • Journal of Aerospace System Engineering
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    • v.12 no.4
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    • pp.49-56
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    • 2018
  • In this paper, the performance analysis and the experiment of the brake system using the small piezoelectric-hydraulic pump were performed. Initially, the 3-D modeling of the brake load components was performed for the construction of the brake system. Subsequently, modeling using the commercial program AMESim was performed. A floating caliper model was used as a load for modeling the brake system. Through the AMESim simulation, load pressure, check valve displacement and flow rate under no load state were calculated, and performance analysis and changes in dynamic characteristics were confirmed by adding brake load. A jig for use in fixing the brake load during performance test was manufactured. The flow rate was assessed under no load condition and load pressure formation experiments were performed and compared with simulation results. Experimental results revealed the maximum load pressure as about 73bar at 130Hz and the maximum flow rate as about 203cc/min at 145Hz, which satisfied the requirement of small- and medium-sized UAV braking system. In addition, simulation results revealed that the load pressure and discharge flow rate were within 6% and 5%, respectively. Apparently, the modeling is expected to be effective for brake performance analysis.

Design for Yaw Brake System in Wind Turbine (풍력발전기 요 브레이크 시스템의 설계)

  • Park, Jin-Hwan;Park, Sang-Shin;Yoon, Yong-Ik;Yoo, Chang-Hee;Hwang, Jung-Gyu
    • Tribology and Lubricants
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    • v.27 no.4
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    • pp.204-208
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    • 2011
  • Yaw brakes are used in wind turbines to control the orientation of blades to be perpendicular to the wind. These devices are very important machine elements because they are closely related to the overall efficiency of wind turbines. One unit of yaw brakes is composed of a friction pad and a caliper. In this study, a tangential force between the friction pad and the disk is calculated when the brake is acting in 750 kW wind turbine. Then, stress distribution and the deformation of the caliper are calculated using a finite element analysis. An experimental equipment is also developed to verify the exactness of calculated results. The analytical and experimental results are presented and discussed.

A Study for Failure Examples of Brake Judder with Abnormal Vibration of Disc Brake (디스크 브레이크의 이상떨림에 관한 고장사례연구)

  • Moon, Hak Hoon
    • Journal of the Korean Institute of Gas
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    • v.20 no.1
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    • pp.40-45
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    • 2016
  • Brake judder is one of the most serous problems in automotive-brake systems.it has not been eradicated despite all the efforts that many researchers and engineers have made the reduce it by studying its causes and mechanisms. Brake discs play a significant role in judder.The driver experiences judder as vibrations in the steering wheel,brake pedal and floor.in the higher freqency range.the structural vibrations are accompanied by a sound. Brake judder primarily affects the comfort but could,when confronting an inexperienced driver for the first time,lead to faulty reactions and reduced driving safety.

Design Parameter Optimization of Rope Brake System far Elevator (엘리베이터용 로프 브레이크 시스템의 설계변수 최적화에 관한 연구)

  • 윤영환;최명진
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.6
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    • pp.85-94
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    • 2001
  • Hydraulic systems of rope brake for elevators are modelled to evaluate design parameters such as cylinder pressure, pis-ton displacement, accumulator capacity, and so on. To assure the results, experiments were performed. The analysis results agree well with the experimental results. The scheme in this study is expected to be utilized in the design of rope brake system for elevators to get design parameters and to improve the safety.

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Analysis and Evaluation of the Brake NVH Characteristics for the Fusion-type Friction Material (퓨전형 마찰재의 브레이크 NVH 특성 해석 및 평가)

  • Kwon, Seong-Jin;Bae, Chul-Yong;Kim, Chan-Jung;Kim, Wan-Soo;Lee, Dong-Won;Lee, Bong-Hyun;Seo, Byoung-Youn;Jung, Kwang-Ki
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.606-607
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    • 2008
  • Nowadays, noise and vibration phenomena of a disc brake system have been given various names that provide some definitions of sound and vibration emitted such as grind, grunt, moan, squeak, squeal, judder and wire brush. The most common and annoying noise of a disc brake system is squeal noise. It is defined as noise whose frequency content is 1 kHz and higher with excessively high and irrigating sound pressure levels. In this paper, the noise and vibration characteristics of a disc brake system have been investigated to develop the fusion-type friction material, which overcomes the low steel and non-asbestos organic friction materials. For the purpose, both experimental evaluation and complex eigenvalue analysis have been carried out.

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모터와 브레이크의 복합동작에 기초한 가상환경의 구현

  • 권태범;송재복
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.19-19
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    • 2004
  • 햅틱장치는 가상환경이나 원거리에 있는 환경과 사용자가 상호 작용할 매 촉감이나 힘을 전달하는 장치이다. 사용자에게 힘을 제시하기 위한 액츄에이터는 모터와 브레이크가 많이 사용되는데, 각각의 특성에 맞게 제어하여 성능과 안정성을 동시에 만족시켜야 한다 모터와 같은 능동 액츄에이터는 토크를 원하는 방향으로 쉽게 출력할 수 있지만, 동작 중 불안정한 상태가 발생할 수 있다. 반면에 브레이크와 같은 수동 액츄에이터는 회전에 반대되는 방향으로만 토크를 발생시킬 수 있지만, 동작 중 에너지를 계속 소모하기 때문에 시스템이 본질적으로 안정하다.(중략)

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디스크 로터의 형상에 따른 차량용 브레이크 시스템의 성능 연구

  • Choe, Dong-Gwon;Jo, Hwang-Gi;Kim, Yun-Ho;Yu, Su-Hwan;Hwang, Seon-Pil
    • Proceeding of EDISON Challenge
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    • pp.351-357
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    • 2017
  • 차량용 브레이크의 성능은 브레이크 디스크 로터의 냉각 성능과 밀접한 관련이 있다. 냉각 성능 향상을 위해 디스크 로터에 구멍을 뚫거나 홈을 깎아내어 열 전달면을 극대화 시키거나 열 전도도가 높은 재료에 대한 연구가 활발하게 진행되고 있다. 본 연구에서는 각각 형상이 다른 디스크 브레이크 시스템의 방열 및 제동 성능, 패드 압력에 대한 응력을 분석하고 온도장 근사 및 열전도 해석 프로그램(Heat_transfer, KAIST, EDISON)과 Elastic-Plastic Analysis SW(CSD_EPLAST, 서울과학기술대학교, EDISON) 및 ABAQUS를 이용해 각각의 냉각 성능 및 응력 분포를 비교 분석한다.

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A Study on the prediction of braking time for rotor brake system considering the friction coefficient variation with temperature (마찰계수의 변화를 고려한 로터 브레이크 시스템의 제동시간 예측)

  • Choi, Jang-Hun;Oh, Min-Hwan;Cho, Jin-Yeon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.37 no.7
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    • pp.653-660
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    • 2009
  • A helicopter rotor brake system stops or reduces the speed of the rotor by transforming the kinetic energy into the heat energy. The frictionally generated heat has a considerable effect on the frictional property of material itself and causes the change of the friction coefficient which may affect the breaking time significantly. In this paper, to take into account the effect of change of friction coefficient according to temperature on braking time, thermo-mechanically coupled analysis is carried out by commercial software ABAQUS. Further, simple theoretical equation is derived considering thermo-mechanical behaviors. The predicted braking times both from theoretical and numerical methods are compared and validity of proposed theoretical equation is investigated.