• Title, Summary, Keyword: 다이나모시험

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Development of Helicopter Chassis Dynamometer System for the Scaled Helicopter Ground Test (축소 헬기 지상시험을 위한 헬리콥터 섀시다이나모미터 개발)

  • Kim, Ick-Tae;Kim, Jae-Soo
    • Aerospace Engineering and Technology
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    • v.11 no.1
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    • pp.185-191
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    • 2012
  • This paper developed Helicopter Chassis Dynamometer System(HCDS) to perform the bench test of the scaled rotor blade and to design a scaled model helicopter flight test bed and accomplished the scaled helicopter ground test. The scaled helicopter should be checked the relation of thrust and power input to maintain regular RPM by collective pitch angle versus throttle input. It showed hovering performance results of IGE with OGE, the max. F.M. was 0.76 without ground effect. The results of the chassis dynamometer test of scaled helicopter will usefully apply to design the scaled helicopter and evaluate the rotor blade performance.

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.

H-Bridge Multi-level Inverter with Eddy Current Dynamometer (와전류 다이나모 메타 부하시험기를 이용한 H-브릿지 멀티레벨 인버터)

  • Lim, Ick-Hun;Kim, Bong-Suck;Ryu, Ho-Seon
    • Proceedings of the KIEE Conference
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    • pp.972-973
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    • 2006
  • 본 논문에서는 고압전동기를 직접 드라이브 할 수 있는 H-브릿지 멀티레벨 인버터를 제안한다. 전동기의 부하장치로는 에디커런트 다이나모메타를 사용하였다. H-브릿지 멀티레벨 인버터는 여러 개의 단상 Power Cell을 직렬로 연결함으로써 저전압 전력용 반도체를 사용하여 고전압을 얻을 수 있고, 정현파에 가까운 출력전압 파형을 얻을 수 있는 멀티레벨 인버터 토폴로지이다. H-브릿지 멀티레벨 인버터의 주요 장점은 Power Cell의 모듈화, 셀 단위의 보호동작 용이, 확장성 향상 그리고 제어 신호 및 Power Cell의 신뢰성 향상에 있다. 본 논문에서 제안하는 H-브릿지 멀티레벨 인버터는 상당 3개의 Power Cell이 직렬로 연결되어 총 9개의 Power Cell로 구성이 되어, 선간전압은 13레벨이며 dv/dt가 적으며 입력 단 THD를 크게 낮출 수 있다. 정격용량 180kVA 이고 출력전압이 480V인 H-브릿지 멀티레벨 인버터를 제작하여 와전류 다이나모메타 부하 시험을 통해 제안된 방법의 타당성과 신뢰성을 입증하였다.

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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.

Analysis of Vibration and Stress for Bed Structure of Engine Dynamo Tester (엔진 다이나모 시험기 베드 구조물의 진동 및 구조응력해석)

  • 이영신;강이석;김동진;김영대;김의석
    • Computational Structural Engineering
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    • v.11 no.3
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    • pp.173-185
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    • 1998
  • 본 연구에서는 자동차엔진 및 트랜스미션 성능시험을 위한 다이나모 베드구조물을 분석하고 설계하였다. 해석상에 고려된 베드구조물은 Ⅰ형강 구조물, 보강된 박스구조물 그리고 블록구조물로 제작되었으며, 시험을 위한 엔진 및 트랜스미션은 베드상판에 장착된다. 엔진구동시 회전에 의한 진동이 발생된다. 공진을 피하기 위해 베드구조는 충분한 구조적 일체성을 가져야 한다. 본 연구에서는 베드 구조물의 응력, 변위 그리고 자유진동해석이 ANSYS Code를 이용한 유한요소해석이 수행되었다. Ⅰ형강 구조형 베드 구조물에서 최대 응력은 23.2MPa에서 90.3MPa까지 나타났으며, 최대 처짐은 0.25㎜에서 0.92㎜까지 나타났다. 박스 구조형 베드 구조물에서 최대 응력은 0.028MPa에서 0.259MPa까지 나타났으며, 최대 처짐은 0.031㎜에서 0.413㎜까지 나타났다. 그리고 박스구조형 베드 구조물에서 최대 처짐은 0.92MPa에서 2.15MPa까지 나타났으며, 최대 처짐은 1.1㎜에서 2.7㎜까지 나타났다. 모든 구조물이 응력과 처짐 값에서 매우 안정적인 범위 내에서 발생됨을 볼 수 있었다. 구조진동해석에서 Ⅰ형강 베드구조물의 고유진동수는 112.03㎐에서 141.66㎐까지의 범위에 발생되었다. 박스 구조형 베드구조물에서의 고유진동수는 396.93㎐에서 755.11㎐까지의 범위에서 발생되었다. 마지막으로 블록구조형 베드구조물에서는 266.51㎐에서 244.67㎐까지의 고유진동수를 찾을 수 있었다. 모든 구조물에서 베드구조물의 무게증가에 따른 기본진동수는 증가된다. 베드시스템의 지지기초시스템은 2자유도계 시스템으로 설계되었으며, 다양한 질량변화 및 스프링상수 변화에 따른 진동해석을 수행하였다. 질량비가 증가될수록 고유진동수는 크게 감소되며, 스프링상수가 증가될수록 고유진동수는 감소된다.

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Effect of Pad Structure and Friction Material Composition on Brake Squeal Noise (제동패드의 구조와 마찰재 조성이 제동 스킬소음에 미치는 영향)

  • Goo, Byeong Choon;Kim, Jae Chul;Lee, Beom Joo;Park, Hyoung Chul;Na, Sun Joo
    • Journal of the Korean Society for Railway
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    • v.20 no.1
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    • pp.1-10
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    • 2017
  • Brake squeal noise has been a challenging problems for a long time. It is very annoying to passengers and residents near tracks. Two methods have been applied to reduce or eliminate brake squeal noise. One is to improve frictional materials; the other is to optimize the topology and structures of brake pads. In this study, we developed two kinds of brake pads; one is a pad whose frictional material is different from the KTX brake pad friction material; the other is a flexible pad that has the same frictional material as that of the KTX brake pad, but a different structure. Squeal noise and friction coefficients were measured and analyzed using a full-scale brake dynamometer. It was found that the dynamometer test can simulate the squeal noise of KTX trains at stations. The squeal frequency of the KTX at 4500Hz was exactly reproduced; this value of 4500Hz was one of the natural frequencies of the KTX brake disc. It was also found that the squeal noise depended on the caliper pressure, initial disc temperature and braking speed. The average friction coefficient was 0.35~0.45. The new pad lowered the squeal noise by 17.3~21.6dB(A).

The Studies on the Fabrication and Properties of Friction Materials toy Aluminium Alloy Disk (알루미늄 합금 디스크용 마찰재의 제조 및 그 특성에 관한 연구)

  • 손태관;장상희;제갈영순
    • Composites Research
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    • v.16 no.4
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    • pp.22-28
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    • 2003
  • This article deals with the manufacture and test results of asbestos-free friction material for Aluminium at toy disk. In order to obtain optimum formulation, various formulations of fibres, matrix, modifiers, fillers, etc were designed and evaluated. The constant friction and brake dynamometer tests were performed to know weak and strong point for each friction material. The C21 formulation of various tested formulations exhibited superior friction constant(0.38∼38), fade rate (18%) by JASO C406 test mode and maximum wear 1.6 mm. disc wear 0.08 mm by JASO C427 test mode. The surface morphology of AL alloy disk(before and after test) was observed by Scanning Electron Microscope(SEM) and Image Analyzer.

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.

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.

An Experimental Study on the Smoke Reduction System of the Exhaust Gas Suction Type (배기 흡입형 매연저감장치에 관한 실험적 연구)

  • Ki, Si-Woo;Choi, Sang-Su
    • Journal of the Korean Society of Marine Engineering
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    • v.34 no.6
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    • pp.833-839
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    • 2010
  • Over the past years, many research works have been carried out to investigate the factors which govern the performance of diesel engine. The air pollutant emission from the diesel engine is still a significant environmental concern in many countries. In the present study, new system of smoke reduction of diesel engine is proposed. This new system is using vacuum equipment for capture smoke. To confirm new system experiments were performed at engine dynamometer. As a result of this experiment, the smoke reduction of this system was identified.