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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/35288

    Title: 機車引擎進排氣系統的實驗計畫分析及設計
    Other Titles: Experimental analysis and design for intake and exhaust air system in small engine
    Authors: 張庭豪;Chang, Ting-hao
    Contributors: 淡江大學機械與機電工程學系碩士班
    史建中;Shih, Chien-jong
    Keywords: 引擎進排氣系統;實驗計畫與分析;最佳化設計;Small engine;Intake and Exhaust pipeline;Design of experiment and analysis;Design optimization
    Date: 2009
    Issue Date: 2010-01-11 06:19:14 (UTC+8)
    Abstract: 本研究應用實驗計畫,實驗分析與多目標最佳化方法,以提高四行程機車引擎的輸出扭力。近年來因地球暖化現象與替代能源開發不易的情況下,使得更注重節能減碳的研究。由文獻探討得知可經由進排氣管路系統的設計,提高引擎輸出扭力。所以本研究改善機車引擎進排氣管路系統設計,提高引擎輸出扭力,並降低油耗與污染物的排放量。經研究得知,機車在4000rpm至5500rpm的輸出扭力不足,影響加速性能,所以特別注重在此轉速區域的性能改善與提升。
    This thesis contains the design of experiments, experimental execution, analyses of experiments, and multi-objective design optimization that promotes the overall engine torque characteristics in a small type of 4-stroke engine. Particularly to promote the accelerating engine torque between 4000 to 5500 rpm, the primary target requires to redesign the intake air pipeline system and exhaust pipe line system. Moreover, in the current age, a common knowledge of saving energy and to maintain a clean and high level environmental quality is extremely urgent in developing the engine pipeline system used injection fuel system so that the high engine torque performance can be achieved.
    A 125cc original motor bicycle is used for the study by applying the formal technique of experimental design and analysis to obtain the optimum output torque, fuel consumption, CO and HC compound of a small engine. The response surface functions of those four performances corresponding to the mechanical factors of pipeline are investigated. Such mathematical information is utilized for constructing four objectives design optimization so that the optimum sizes of intake pipeline can be obtained. Several cases studies under this investigation include the weighting method for four design objectives. Three primary stages with strategies are performed for the redesign to the pipeline. First of all, the redesign of the intake and exhaust air pipeline for an existing motor bicycle. The second important phase is to simulate the variable volume pipeline by a two-pipe model with a switch valve. The design variables are diameters of two pipe, two pipe lengths and the optimum speed of switch valve opening. This two-pipe model has a torque-drop phenomenon during the opening of switch valve. Therefore, a three-pipe model is proposed for the further study. In that case, eight design variables including three diameters, three lengths and two speeds of opening switch valves to maximize the engine torque, minimize the fuel consumption, and minimize pollutions, simultaneously.
    This study proposed a workable design of experiment, analysis and optimization in a sequent process for improving the engine characteristics. A three-pipe model of simulating the variable volume of intake air system is the most recommended to enhancing the output torque, save energy and reduce the outcome pollution. The two-pipe model is usable due to its economic and simple structure.
    Appears in Collections:[機械與機電工程學系暨研究所] 學位論文

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