Abstract
The theory of orthogonal test provides a new design idea for the design of muffler with complicated structure. The second baffle plate position, outlet pipe perforation rate, connecting pipe diameter and perforation rate of a heavy vehicle exhaust muffler are chosen as the level factors. The sum of the transmission loss in the frequency range from 510Hz to 640Hz is chosen as the evaluation index. Based on the orthogonal test theory, GT-POWER software is used to analyze the evaluation index under different level factors. According to the orthogonal analysis table, optimization of the internal structure for the muffler is carried out. The optimized results show that attenuation performance of the optimized muffler in the optimized band is superior to the original muffler and the frequency bands allowing noise to pass through is significantly reduced.
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