| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 103 === This paper is mainly aimed at reducing exhaust noise wakes designed exhaust pipe of the muffler , conducted muffler improved due to Two-stroke engine is sequentially actuating the intake stroke, compression, ignition and exhaust, Therefore connected to the engine exhaust pipe which has a number of internal airflow( pulse wave )also called (compression wave). When the pulse leaving the nozzle, diffraction and reflection will occur a phenomenon in the tube mouth, thereby generating the noise of exhaust pipe downstream. In the experiments, Use generic mini engine as the object, measuring the spectrum of different exhaust tone wake speeds and with the results of the comparison made between different TYPE. Hope through this research can be more precise The relationship between the engine operating condition and exhaust noise, so that the subsequent development of the noise is more accurate, saving time and cost , research data will be rationalized in the design, the overall engine design and production of commercial considerations thus achieving a comprehensive assessment of quality improvement.
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