• Title, Summary, Keyword: Dynamo test

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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.

Dynamo Test Research for Performance Verification of CV-NCM Cast Iron Brake Disk (CV-NCM 주철재 제동디스크의 성능 검증을 위한 다이나모 시험연구)

  • Gil, Hyeong-Gyeun;Ko, Tae-Whan;Cho, Dong-Hyun;Han, Seong-Ho
    • Proceedings of the KSR Conference
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    • pp.274-280
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    • 2006
  • The study is to analyze dynamo test results for various commercial pads in order to verify the performance of brake disk with CV-NCM cast iron. The developed brake disk will apply to 200 km/h tilting trains that is being developed as one part of project for speed-up on Korean existing railroad. The test program is made out suitably for braking condition and performance of test equipment by referring UIC 541-3. Two kinds of resin pad and one kind of foreign sintered pad suitable for 200 km/h trains are used as various commercial pad for the dynamo test. The data aquisition for the maximum and smallest temperature, hot spot, etc. on disk and pad is performed by using the thermocouples and thermal imaging cameras. From this research, we obtained braking characteristics between CV-NCM cast iron disk and pad of various material and will be utilized usefully as basis data of performance optimization of developing sintered pad.

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Compatibility Evaluation between NCM-CV Cast Iron Brake Disk and Various Pads (NCM-CV 주철 제동디스크와 다양한 패드의 적합성 평가)

  • Gil, Hyeong-Gyeun;Ko, Tae-Whan;Cho, Dong-Hyun;Han, Seong-Ho;Seo, Sung-Il
    • Journal of the Korean Society for Railway
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    • v.10 no.3
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    • pp.251-256
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    • 2007
  • The research analyzed dynamo test results to evaluate compatibility between brake disk made of NCM-CV cast iron and various pads. The dynamo test was executed with one kind of resin pad and three kinds of sintered pads suitable for 200 km/h trains according to a program which refers to UIC 541-3. The thermocouples were established in specific location in order to measure the temperature of disk and pads. In addition, the thermal imaging camera was used for capturing the instantaneous thermal characteristic of disk. The research results may be utilized to use as basis data of pad development for NCM-CV brake disk hereafter.

A Study on Friction and Wear Characteristics of Sintered W/C-35%Ni Tappets for Diesel Engine Application (디젤엔진용 소결(W/C35%Ni) 태핏의 마멸거동에 관한 연구)

  • 류병진;오세일;박맹로;양승호
    • Tribology and Lubricants
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    • v.16 no.1
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    • pp.33-38
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    • 2000
  • Abstract- In this paper tribological characteristics of solid and liquid phase sintered W/C-35%Ni tappets were investigated. Three test methods were performed to investigate the wear and surface damage mechanism of sintered tappets. First, block-on-ring wear test was performed to investigate the wear characteristics under pure sliding condition. Second, simplified cam and tappet tests (called component wear test hereafter) were carried out to simulate the real contact history of cam and tappet. Also, after the test, contact surfaces were analyzed with scanning electron microscope to study the wear mechanism. As a final screening, engine dynamo tests were performed. Results showed that in the block on ring sliding wear test, solid phase sintered specimens showed superior wear resistance to liquid phase sintered specimens. The component wear tests and engine dynamo tests also showed the same results. Therefore, in these tests, solid phase sintered tappet material revealed superior wear resistant properties to liquid phase sintered one.

Research on Development of Dynamo based Vehicle Brake force Inspection Equipment (다이나모 기반의 차량 제동력 검사장비 개발 연구)

  • Lim, Jinwoo;Lee, Kwang-Hee;Kim, John;Lee, Chul-Hee
    • Journal of Auto-vehicle Safety Association
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    • v.9 no.4
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    • pp.20-25
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    • 2017
  • Dynamo based vehicle inspection device is end of line device for automobile industry. The device is utilized as implementing vehicle functionality inspection such as brake force, cruise control, kick-down acceleration, CAN inspection. As dynamo based inspection device is broadly adopted in automobile industry, the dynamic study is required to verify the vehicle test equipment reliability. This research recommends appropriate dynamic brake force inspection procedure and theoretical background for developed equipment. Dynamic characteristic of brake force implementation to roller is simplified. With simplified characteristics, the indirect brake force measurement strategy is developed and adopted. Comparison of each brake force result, the appropriate brake force inspection criterion is given.

An Experimental Study on Brake Judder via the Frequency Analysis of the Brake System and Vehicle System of a Commercial Vehicle (상용차량의 브레이크 시스템과 차량 시스템 주파수 분석을 통한 브레이크 저더의 실험적 고찰)

  • Moon, ll-Dong;Kim, Jong-Dae;Oh, Chae-Youn
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.31 no.12
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    • pp.1131-1138
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    • 2007
  • This paper studies experimentally on the building-up process for the amplitude of a commercial truck vibration induced by brake judder. A front axle drum equipped with a drum brake system is utilized for this experiment. A brake dynamo test, a real vehicle ride test and a real vehicle braking test are performed for the analysis of brake judder. The brake dynamo test measures judder by applying brake chamber pressures of 1, 2 and 3 bar at initial brake pad temperatures of $100^{\circ}C$ and $150^{\circ}C$. In order to assess the vertical acceleration at the front axle, the real vehicle ride test on a straight test road with velocities of 20, 40, 60 and 80 km/h is performed. The real vehicle braking test is carried out at the deceleration rate of 0.2g from a velocity of 90km/h for evaluating the vertical, lateral and longitudinal accelerations both at the front axle and at the cab floor under the driver's seat. The magnitudes and frequencies of the measured peak accelerations from the brake dynamo test, the real vehicle ride test and the real vehicle braking test are comparatively analyzed. This paper shows that the vibration produced by brake judder is built up due to the brake system's peak acceleration frequency being close to the vehicle ride mode's frequency.

Test method for Motor/controller for Electric Vehicle (전기자동차용 전동기/제어기의 시험 방법)

  • 오성철
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.4
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    • pp.328-335
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    • 2003
  • Test procedure for Electric Vehicle(EV) motor/controller has been developed. Most of existing standards mainly focus on minimum requirements for safe operation. However, detailed test procedures are not covered in the standard. In order to develop test items, methods and procedures which should be strictly applied to EV motor and controller, existing standards have been reviewed by the expert group in Korea. Based on their feedback, standard test procedure was proposed. Test procedure especially for combined motor and controller has been proposed. As a load lot the tested motor, M-G set, eddy current type engine dynamo and AC dynamo were used. Test procedures for the driving cycle test and regeneration test were proposed.

Simulation-based Optimum Allocation of a Resonator for Reducing the Blow Noise of a Turbocharger in a Diesel Engine (디젤 엔진에서의 터보 차저 Blow 소음 저감 위한 시뮬레이션 기반 공명기 위치 최적화)

  • Kang, Yong-Hun;Choi, Dong-Hoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.2
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    • pp.129-134
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    • 2010
  • A diesel engine is equipped with a turbocharger for providing more power at a low engine speed region by supplying charge air to combustion chambers. The turbocharger makes it possible to satisfy stringent emission regulations and customers' demand of enjoying the fun to drive by increasing engine performance. However, the turbocharger has the disadvantage of making BPF(Blade Passing Frequency), hissing, surge, whistle, and blow noises. Among them, reducing the blow noise, a narrow-band noise(a general range : 1800~2000Hz), is possible by using a resonator that controls the narrow frequency band governing the resonance in the intake system. In this study, the optimum location of the resonator is found by employing Boost as a CAE(Computer Aided Engineering) tool and is confirmed by experiments of an engine dynamo test and a real vehicle test.

Experimental Research on Braking Characteristics of Aircraft ABS Brake System with Ground Conditions (항공기용 ABS 제동시스템의 노면 조건별 제동특성에 관한 시험적 연구)

  • Yi, Mi-Seon
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.25 no.2
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    • pp.18-24
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    • 2017
  • Results of the experimental research are described in this thesis, which are about braking characteristics of aircraft ABS brake system with different ground conditions. Dynamo-tests were conducted with the state of the application aircraft condition and with two different ground conditions. The Braking characteristics on each ground condition were drawn from the results of occurrence of skid, braking distance and deceleration. The braking performance of the application aircraft could be anticipated and the efficient range of braking operation could be set with those results.

The Practical Method and Experimental Verification of Temperature Estimation in the Permanent Magnet of Electric Machine

  • Kang, Kyongho;Yu, Sukjin;Lee, Geunho;Lee, Byeong-Hwa
    • Journal of Magnetics
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    • v.20 no.4
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    • pp.421-426
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    • 2015
  • This paper presents a practical method for estimation of average temperature in the permanent magnet (PM) of electric machine by using finite element analysis (FEA) and dynamo load experiment. First of all, the temperature effect of PM to the torque has been employed by FEA in order to evaluate the Temperature-Torque characteristic curve. The 1st order polynomial equation which is torque attenuation coefficient is derived by the FEA result of the Temperature-Torque curve. Next, torque saturation test with constant current condition is performed by dynamo load experiment. Then, the temperature trend can be estimated by adding the initial starting temperature using the torque attenuation coefficient and torque saturation curve. Lastly, estimated temperature is validated by infrared thermometer which measures temperature of PM surface. The comparison between the estimated result and experimental result gives a good agreement within a deviation of maximum $8^{\circ}C$.