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International journal of automotive technology 5건

  1. [국내논문]   EFFECT OF OVER-EXPANSION CYCLE IN A SPARK-IGNITION ENGINE USING LATE-CLOSING OF INTAKE VALVE AND ITS THERMODYNAMIC CONSIDERATION OF THE MECHANISM  

    Shiga, S. (Department of Mechanical Engineering, Gunma University ) , Hirooka, Y. (Mitsui Ship Building Co. ) , Miyashita, Y. (Department of Mechanical Engineering, Gunma University ) , Yagi, S. (Advisor Emeritus, Hona R&D Co. ) , Machacon, H.T.C. (Kiryu Dai-Ichi High School ) , Karasawa, T. (Department of Mechanical Engineering, Gunma University ) , Nakamura, H. (Department of Mechanical Engineering, Gunma University)
    International journal of automotive technology v.2 no.1 ,pp. 1 - 7 , 2001 , 1229-9138 ,

    초록

    This paper presents further investigation into the effect of over-expansion cycle in a spark-ignition engine. On the basis of the results obtained in previous studies, several combinations of late-closing (LC) of intake valve and expansion ratio were tested using a single-cylinder production engine. A large volume of intake capacity was inserted into the intake manifold to simulate multi-cylinder engines. With the large capacity volume, LC can decrease the pumping loss and then increase the mechanical efficiency. Increasing the expansion ratio from 11 to 23.9 with LC application can produce about 13% improvement of thermal efficiency which was suggested to be caused by the increased cycle efficiency. The decrease of compression ratio from 11 to 5.5 gives little effect on the thermal efficiency if the expansion ratio could be kept constant. Thus, the expansion ratio is revealed to be a determining factor for cycle efficiency, while compression ratio is no more important, which suggests the usefulness of controlling the intake charge with intake valve closure timing. These were successfully explained by simple thermodynamic calculation and thus the mechanism could be verified by the estimation.

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  2. [국내논문]   FATIGUE SIMULATION OF POWER TRAIN COMPONENTS DURING THE DESIGN PROCESS   피인용횟수: 2

    Steiner, W. (Steyr-Daimler-Puch, ECS, Technology Center Steyr ) , Steinwender, G. (Steyr-Daimler-Puch, ECS, Technology Center Steyr ) , Unger, B. (Steyr-Daimler-Puch, ECS, Technology Center Steyr)
    International journal of automotive technology v.2 no.1 ,pp. 9 - 16 , 2001 , 1229-9138 ,

    초록

    The lifetime of power train components can be improved dramatically by finding crack initiation points with suitable software tools and optimization of the critical areas. With increasing capacities of computers the prediction of the lifetime for components by numerical methods gets more and more important. This paper discusses some applications of the outstanding fatigue simulation program FEMFAT supporting the assessment of uniaxially and multiaxially loaded components (as well as welding seams and spot joints). The theory applied in FEMFAT differs in some aspects from classical approaches like the nominal stress concept or the local one and can be characterized by the term "influence parameter method". The specimen S/N-curve is locally modified by different influence parameters as stress-gradient to take into account notch effects, mean-stress influence which is quantified by means of a Haigh-diagram, surface roughness and treatments, temperature, technological size, etc. It is possible to consider plastic deformations resulting in mean-stress rearrangements. The dynamic loading of power train components is very often multiaxial, e.g. the stress state at each time is not proportional to one single stress state. Hence, the directions of the principal axes vary with time. We will present the way how such complex load situations can be handled with FEMFAT by the examples of a crank case and a gear box.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  3. [국내논문]   LINKING EVALUATION OF SUBJECTIVE TIRE TESTS ON THE ROAD WITH OBJECTIVELY MEASURED DATA  

    Stumpf, H.W. (Technikum Joanneum GmbH)
    International journal of automotive technology v.2 no.1 ,pp. 17 - 23 , 2001 , 1229-9138 ,

    초록

    Measurements of the initial values lead to an inverse and mathematically unprecisely formulated problem. A precise definition of an inverse problem is possible. It is to state a mathematical model of a physical process with clearly defined initial and exit values for the system behind the process. One can grasp the idea of an inverse problem by considering the tire as a copy of the objects of nature in a room with observations. Interpretation of nature is generally a result of an inverse problem. On one hand, the tire may be represented through the sensory organs and the nervous system as well as the experiences of the developer's existing apparatus of the projection of reality. On the other hand, it may be represented by a physical law or a model that can be confirmed or is to be refuted with the help of suitable measurements. During reconstruction of a measuring signal and the identification of a black box that can be assumed to be linear and causal, the tire becomes a first type Volterra integral equation of the convolution type. But measurements of the initial values are always fuzzy, the errors grow and the system behavior can no longer be forecasted. Thus, we have to deal with a chaotic system. This chaos produces fractals in a natural way. These are self-similar geometric structures. This self-similarity is clearly visible in the design.

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  4. [국내논문]   INFLUENCE OF INITIAL COMBUSTION IN SI ENGINE ON FOLLOWING COMBUSTION STAGE AND CYCLE-BY-CYCLE VARIATIONS IN COMBUSTION PROCESS  

    Lee, Kyung-Hwan (Department of Automotive Engineering, Sunchon National University ) , Kim, Kisung (Department of Mechanical Engineering, Yosu National University)
    International journal of automotive technology v.2 no.1 ,pp. 25 - 31 , 2001 , 1229-9138 ,

    초록

    It is necessary to understand the combustion process and cycle-by-cycle variation in combustion to improve the engine stability and consequently to improve the fuel economy and exhaust emissions. The pressure related parameters instead of mass fraction burned were compared for the effect of initial combustion pressures on the following combustion and the analysis of cycle-by-cycle variation in combustion for two pen injected SI engines. The correlation between IMEP and pressures at referenced crank angles showed almost the same trends for equivalence ratios, but the different mixture preparations indicated different tendency. The dependency of IMEP on pressure at the referenced crank angles increases as the mixture becomes leaner for both engines. The mixture distribution in the combustion chamber was varied with the coolant temperature and intake valve deactivation due to the evaporation of fuel and air motion. The correlation between pressure related parameters were also compared for the coolant temperatures and air motion.

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  5. [국내논문]   PREDICTION OF SOUND RADIATION FROM TIRE TREADBAND VIBRATION  

    Kim, B.S. (Department of Automotive and Machinery, Suncheon First College)
    International journal of automotive technology v.2 no.1 ,pp. 33 - 38 , 2001 , 1229-9138 ,

    초록

    The noise generated from a treadband mechanism of a tire has been the subject of this research. In particular, the treadband has been treated as an infinite tensioned beam resting on an elastic foundation which includes damping. The main objective is here to predict the sound power generated from a system mentioned above by locating harmonic point forces representing the excitation of treadband at the contact patch. It is possible to predict the sound power radiated from this structure by wavenumber transformation techniques. To find out the minimum radiated sound power, All parameters were varied. Thus this model can be used as a tire design guide for selecting parameters which produce the minimum noise radiation.

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