• 한국항해항만학회지
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• 제32권10호
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• pp.793-798
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• 2008

이 논문은 차량 사이드 미러용 고감도 RFID 태그 안테나의 설계에 대해 나타내었다 제안된 태그 안테나($154\;mm{\times}66\;mm{\times}1;mm$)는 900 MHz에서 공진하며 690 MHz($490\;MHz{\sim}1180\;MHz$)의 넓은 대역폭을 가진다. 태그 안테나의 측정된 이득과 인식거리는 각각 5.8 dBd와 10 m 이다. 차체를 포함한 사이드미러 내부에 위치한 제안된 태그 안테나의 방사패턴과 인식거리가 전파암실에서 측정되었다. $90^{\circ}$근방에서의 인식거리는 차체가 없는 제안된 안테나의 인식거리와의 비교로부터 약 1.5 m 확장된 것을 확인하였다. 제안된 태그안테나의 우수한 성능이 상용 태그안테나의 측정된 결과들과의 비교에 의해 관측되고 입증되었다.

• 한국자동차공학회논문집
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• 제6권2호
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• pp.129-143
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• 1998

The vibrations of steering wheel are required to be reduced for convenient ride quality and good controllability. This phenomenon, vibration of steering wheel, is occured by interaction with suspension system, steering system, vehicle body, engine/transmission and tire complicately. But reviewing the current research activities, most researches are performed for the vibration analysis of steering wheel with a simple model, and mot easy to be applied to the variation of each component element connected with steering system as well as that of the steering system. In this study, suspension system and steering system are modelled by the T.L.H. coordinate system which is usually used by a passenger car maker. Also, rigid body motions of engine and elastic motions of vehicle body in the previous study are considered. Derive the equation of motion in 29 d.o.f. and the vibration of steering wheel is analyzed numerically and verify the midelling of steering system by comparison with test results for real car. And then, the optimal design values of the engine mount system obtained from the previous study are applied to the verified steering system model and investigate the effects of various engine mount design values on the vibration of steering wheel.

• 전기전자학회논문지
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• 제18권1호
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• pp.114-118
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• 2014

본 연구에서는 디젤 차량용 통합형 연료히터와 성능검사 시스템구현을 통해 생산공정을 개선한다. 센서와 히터가 분리된 연료히터를 히터내에 센서를 안착시켜 통합함으로써 일체형 통합히터를 개발하고, 성능평가 시스템 개발을 통하여 시험한다. 이때 성능평가 시스템은 통합히터를 구성하는 body, upper plate, stopper, lower plate, PTC, screw, 바이메탈 및 외부 터비날의 특성을 분석하고, 통합히터의 생산성을 결정한다. 저온 유동성시험장치에서는 극저온에서 고온사이 동작검사, 시험저항 설정에 따른 저항동작지연 및 전류동작지연, 온도변화에 따른 바이메탈 지연 검사, 블록히터의 전류 및 저항 검사, 히팅 운전검사 등을 수행한다. 따라서 효율적인 생산공정 과정을 통해 연료히터의 성능을 개선하는 생산공정 개선 알고리즘을 제시한다.

• International Journal of Automotive Technology
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• 제4권3호
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• pp.149-156
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• 2003

This paper is concerned with the energy absorption efficiency of auto-body side structures for the conventional steel and 60TRIP high strength steel. In order to evaluate the energy absorption efficiency, the dynamic crash analysis is carried out with the regulation of US-SINCAP. The analysis adopts the Johnson-Cook model for the dynamic material properties, which have been obtained from dynamic material tests. For the sake of the dynamic material properties, the analysis has been accurately peformed for the crashworthiness assesment. The analysis result provides deformed shapes, amounts of penetration and accelerations at several important points during crash. The result confirms that 60TRIP greatly improves the crashworthiness of the side members without sacrificing the weight and thus can be used for the light-weight design of an auto-body.

• 자동차안전학회지
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• 제3권2호
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• pp.34-41
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• 2011

Side collisions (or side crash) account for 51.6% of all car to car accidents occurred in 2010. It is necessary to analyze those vehicles' structure deformation and passengers' injuries in the side collisions. A moving barrier (950kg) is currently used in the KNCAP side impact test. However, in order to enhance a passengers' safety in the side collisions, we introduce an AE-MDB (1500kg) which provides more severe conditions for this test. In this study, the test results using both barriers are compared and analyzed.

• Transactions on Electrical and Electronic Materials
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• 제15권4호
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• pp.201-206
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• 2014

LED lighting,considered to be a new growth industry, has attracted a great deal of attention due to its higher illumination and longer life time than existing light sources. In this study, high-efficiency and long-life LED fog lamps for automobiles were developed, which can substitute the existing 27 W halogen fog lamps for a used car market. For this purpose, the number of LED modules, the body, heat sink, and the output of the fog lamp were first optimized through a numerical analysis. Then, a 10 W-class LED fog lamp was prototyped based on the optimized numerical model, and the performance of the fog lamp was successfully verified through the experiments.

• 한국자동차공학회논문집
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• 제2권2호
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• pp.73-82
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• 1994

Low-band type active suspension system is implemented on a passenger car. Level. roll, pitch and bouncing motion of body are controlled by a digital controller. Sky-hook damper is applied to control bouncing motion. This paper describes overall construction of the system, design of hydraulic system, sensor system, controller, and control scheme. Performance of prototype car has been evaluated on a test track and reported in the second paper.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계 학술대회논문집(수송기계편)
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• pp.161-165
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• 2005

Until now LPG car has drived used to mixer and vaporizer. So LPG car always has problems back fire and when in the winter. LPG Car's Fuel consumption is rather than gasoline. But LPLi Fuel pump located in the fuel tank is directly injection in the engine. So Fuel consumption is better than LPG mixer system and result to reduced exhaust gas. In this paper to reduction of beating noise of LPLi(liquid phase LPG Injection) fuel pump. General speaking we know, beating noise is occur to near frequency each of pump. So we Modification of RPM through chang of amature turn number and area of dimension of the pump's body.

• 한국철도학회논문집
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• 제14권6호
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• pp.545-554
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• 2011

철도교량을 주행하는 열차의 진동사용성 확보를 위해 Eurocode, 신간선기준, 호남고속철도 설계지침 등에서는 교량의 처짐과 차체연직가속도로 진동사용성 기준을 제시하고 있다. 호남고속철도 설계지침 경우 Eurocode를 인용하였기 때문에 향후 열차의 주행속도와 경간길이의 향상 및 확장에 맞추어 철도교량의 진동사용성 기준을 보완함에 있어 철도선진국들에 비해 상대적으로 뒤처질 것으로 예상된다. 따라서 고속철도교량 기술의 국외의존도를 줄이고 기술경쟁력을 확보하기 위하여 주행속도의 증가와 열차-교량 진동전달특성 등을 고려할 수 있는 철도교량의 진동사용성 허용처짐을 제시하기 위한 연구를 수행하였다. 본 논문에서는 매개변수 연구와 열차-교량 상호작용해석을 수행하여 주행속도의 증가에 따른 차체연직가속도와 교량변위의 상관관계를 파악하였으며 주행속도의 증가와 더불어 차체연직가속도가 증가하는 경향을 확인하고 가속도증폭계수를 제안하였다. 그리고 교량의 처짐형상과 진동을 정현파와 조화운동으로 가정하고 진동전달함수와 가속도증폭계수를 이용하여 고속철도교량의 진동사용성 허용처짐을 수식으로 전개하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 춘계학술대회 논문집
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• pp.351-356
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• 2011

Some materials show the character of rigid body in low frequency spectrum. The rigid body motions are consisted of translational and rotational motions. Especially, we can get the acceleration or displacement of a random point in the rigid body by analyzing rigid body transfer matrix at the car's engine and power train. Actually it is difficult to measure the acceleration by attaching the sensor inside of the engine and power train. So the hard to predict acceleration data can be achieved attaching the sensor on the outside of the engine and power train by analyzing the data of rigid body motion which the engine is operated using dynamo. Also this paper will show the change of predicted data and accuracy variation by not using all the measured data but a few exceptions of the point number.