• 재활복지공학회논문지
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• 제9권3호
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• pp.231-236
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• 2015

본 연구에서는 재활운동기기에 적합한 운동부하 조절이 가능한 영구자석형 비 접촉식 원형 브라켓 맴돌이 전류 부하 제동장치를 제안하고 성능을 실험적으로 평가하였다. 제안한 원형 부하 제동장치의 토크 값은 고정 부하를 갖는 "ㄷ"형 부하 제동장치에 비해 49%의 제동력으로 평가되었지만 도전율 변화와 공극의 간격 변화로 다양한 부하 조절이 가능함을 확인하였다. 본 연구에서 제안된 부하 제동장치는 사용자의 상태에 따라 부하 조절이 가능하며 운동기기의 소형화 및 원가 절감 등의 장점을 갖는 운동기기 적용이 가능할 것으로 기대된다.

• 한국산업융합학회 논문집
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• 제27권3호
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• pp.693-699
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• 2024

The main cause of scattering dust generated by transportation equipment such as automobiles was largely due to exhaust gas from internal combustion engines in the past, but it was generally recognized that non-exhaust causes such as abrasion of the tires or brake pads were low. Accordingly, scattering dust generated by exhaust gas has consistently existed in many studies, such as technological progress and related regulations, but research on non-exhaust is relatively insignificant, and the need for research on scattering dust generated by non-exhaust is emerging. In this study, a dust collector that can be easily mounted on a caliper to collect scattering dust generated by pad wear during the brake operation of an automobile was manufactured. In this study, we developed a dust collector that is easy to mount on calipers to collect scattering dust caused by pad wear during brake operation of automobiles. According to the installation of the manufactured dust collector, the performance of scattering dust by brake operation and the temperature change characteristics of calipers according to the structure of the dust collector were evaluated.

• 오토저널
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• 제9권5호
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• pp.6-18
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• 1987

Owing to remarkable development in automotive industry, vehicle performance comes close to perfection and guarantee of stability is getting emphasized in accordance with high speed trend in vehicle. In recent years, the utilization of automatic test method for research and development of automotive brake system is being propelled actively, which pursue whole automatic control from simple measurement to data acquisition. The main subject of this paper is to make a brief explanation on Micro computer controlled Automatic Test Method for Automotive Brake System which makes it possible to test with high accuracy and speed.

• Journal of Advanced Marine Engineering and Technology
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• 제22권1호
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• pp.67-76
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• 1998

Friction materials for brake linings and clutches have severe performance requirements. The principal function of such frictional elements is to convert kinetic energy to heat, and then either to absorb or to dissipate heat. In order to achieve these objectives, the coefficient of friction must be as high as possible, independent of variations in operating conditions, and the necessary energy conversion must be accomplished with a minimum of wear on the contacting parts. In this study, Al powder, Al bronze powder and Mo powder used in general for automobile brake was sprayed on automobile brake disc to restrain rust and to maintain friction performance. Dynamo and corrosion tests have been carried out. It is concluded that the sprayed disc with Al bronze powder has the most improved frictional performance and anti-corrosive characteristics. The main results obtained can be summarized as follows; 1. From the corrosion current density test for gray cast iron and sprayed disc with powders of Al, Al bronze and Mo, it was cleared that the spray treatment with Al bronze powder showed the most superior anti-corrosive characteristics than other powders. 2. By anode polarization toward the noble direction from corrosion potential, corrosion current density with sprayed brake disc by Al-bronze powder was the lowest. 3. Mean frictional coefficients obtained from dynamo test are as follows : the sprayed disc with Al(99.99%) powder was 0.190 ; the sprayed disc with Al-bronze powder was 0.312 ; the sprayed disc with Mo powder was 0.257 ; the non-sprayed disc of gray cast iron was 0.331. In the case of the sprayed disc Al-bronze powder showed the most excellent frictional characteristics . 4. Amount of burnish quantity obtained from burnish test by dynamometer is as follows : the sprayed disc with Al-powder was 1.079 mm : the sprayed disc with Al-bronze powder was 0.155 mm : the sprayed disc with Mo powder was 0.253 mm : the non-sprayed disc of gray cast iron was 0.241 mm. Al-bronze powder also showed the most excellent burnish characteristics.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.361-362
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• 2012

• 한국산학기술학회논문지
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• 제21권6호
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• pp.170-177
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• 2020

본 논문은 전기기계식제동장치(EMB : Electro Mechanical Brake, 이하 EMB)의 제동 압부력(clamping force) 제어방법과 제동시험장비(dynamo test equipment)를 활용한 제동성능 평가결과에 대하여 다룬다. EMB와 관련한 연구는 자동차 분야에서 대부분 수행되었으며, 다양한 제어방법에 대한 정적상태의 압부력 시험결과를 주로 다루고 있으나 본 논문은 동적상태에서의 성능평가를 수행하였다. EMB의 구동을 위해 3상 매입형 영구자석 동기전동기(IPMSM : Interior Permanent Magnet Synchronous Motor, 이하 IPMSM)가 적용되었으며 유한요소법(FEM : Finite Element Method, 이하 FEM) 해석 소프트웨어인 JMAG을 통하여 설계 및 해석을 수행하였다. EMB의 압부력제어를 위해 전류제어, 속도제어 및 위치제어가 수행되었으며, 전류제어기는 단위전류당 최대토크제어(MTPA : Maximum Torque Per Ampere, 이하 MTPA)가 적용되었다. 제동성능평가는 공압식 제동장치의 비상제동 성능시험 절차와 동일한 방법으로 수행되었으며 시험장비에 설치된 고속철도차량의 차륜을 110 km/h, 230 km/h 및 300 km/h로 회전하는 상태에서 각각의 속도 조건에 따른 EMB의 제동 압부력을 인가하여 감속성능을 확인하였다. 최고속도(300 km/h) 상태에서 비상제동 시험결과는 73초의 시간이 소요되었으며 차세대고속철도차량(HEMU-430X)에 적용된 공압식 제동장치의 성능시험 결과와 비교를 통하여 제동소요 시간 및 감속패턴의 유사함 확인하였다.

• 오토저널
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• 제12권5호
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• pp.36-45
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• 1990

In this study an antilocking-brake-system was set up for the single wheel of passenger cars. The control algorithm for the system was programmed by C-language and executed by a 16bit personal computer, which took the role of an electronic control unit. The performance of the antilocking-brake-system was tested using a test rig, which was specially designed and built up for the simulation of braking on the slippery road. The test results were satisfactory. Although the simulation method of the friction characteristics between the tire and the contact surface on the test rig appeared not to be absolutely suitable, the test rig allowed the basic investigation of the influence of the antilocking brake control on the wheel slip.

• 드라이브 ㆍ 컨트롤
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• 제10권3호
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• pp.1-6
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• 2013

Traction control suppresses the spinning of the driven wheel during drive away or acceleration on slippery road condition. In this study, the estimation method of brake pressure hardly measured is proposed. The estimation method of brake pressure and the brake pressure control with pulse width modulation(PWM) are verified a good performance through experiment. Also, the vehicle simulation on slippery road conditions is validated the applicability of brake pressure control for traction control. The simulation results have showed that the brake pressure can be used the control variable for traction control.

• International Journal of Railway
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• 제5권4호
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• pp.152-155
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• 2012

The essential element of brake device for railway vehicle is in demand for higher performance along side the trend of railway vehicle size and speed. Essential element of brake device for high speed train is composed of metallic friction material and brake disc. Thus, brake distance, duration and brake stability shall be determined due to friction materials and friction characteristics. Also friction characteristics are influenced by metallic friction material's properties of matter, manufacturing process and component parts. Various materials and configurations of metallic friction materials are currently being implemented to railway vehicles, For this reason study of friction characteristics in accordance with materials is necessary, but study of these important elements are not actively being accomplished. Therefore, in this study, wished to study the graphite's friction characteristic comprised in friction material in accordance with particle size and amount of volume through lab-scale test.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 A
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• pp.342-345
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• 1997

To achieve adequate brake performance in high-speed trains the brake system should : ${\bullet}$ offer high reliability and high availability, ${\bullet}$ permit deceleration of the train with as little wear as possible, and ${\bullet}$ display good control characteristics with, if possible, infinitely variable control of the braking effort. For these reasons, high-speed train is to be equipped with three different and largely independent brake system : ${\bullet}$ a regenerative brake with regenerative feedback in the driven cars, ${\bullet}$ a linear eddy-current brake in the nondriven cars and ${\bullet}$ a pneumatic disc brake in all cars. This paper describes the conceptual design of braking system for Korea High Speed Train with the maximum speed of 350km/h