| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 102 === As human quality of life improved, relative to demand more and more environmentally conscious, and vehicle emissions are particularly affected, and to reduce noise requirements should not be overlooked, but in the past there has been a number of researchers in this area inking, but mostly to reduce the diameter of the muffler pipe and join other passive damping resonate way to reduce noise (which is a straight pipe silencer), but nevertheless reduces noise but also reduces the relative power of the engine . This study is a steam locomotive exhaust noise devices and other small vehicles emissions arising make improvements in order to be able to reduce the noise has improved.
The institute provides the pulse wave interference silencer, is an optimal feedback control audio, design and implementation of a similar active eliminate engine noise muffler. Sound waves pass through the metal much faster than the speed of the phenomenon of air. The audio signals through the mesh tube end ports, set into a ring audible components, the shock of this component in the gas phase by generating an original and different, but the same waveform Sasser, after adjustment to generate a signal to reverse generating area within the walls of a silencer positions
The results show that although the idle slow, pulse wave interference silencer although the total sound pressure and very close to the original exhaust pipe; but in general the high speed pulse interferometric overall sound pressure muffler exhaust pipe is smaller than the original and effectively improve the straight pipe muffler low-speed torque performance; and release performance at high engine horsepower.
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