【摘要】 本文对YH_2.5油锯噪声及其控制进行了研究。结果表明,油锯最突出的噪声源是排气噪声,其次是进气噪声,而且进气噪声随着转速提高而变化的速率超过排气噪声。因此,寻求消声器的消声性能、空气动力性能和结构性能之间的矛盾统一,设计性能优良的进、排气消声器是油锯噪声控制的关键。通过理论和实验分析的结果表明,油锯消声器采用扩张室和微穿孔板复合结构,合理选择消声器内部结构及最佳设计参数,从整体上考虑进、排气噪声的控制,可以有效地解决消声器性能之间的矛盾。根据上述原则设计的YH_2.5油锯进、排气消声器获得满意的降噪效果。更多还原

【Abstract】 A study on how to eliminate the noise emitted by a TH 2.5 chainsaw was carried out. It was found that the most important source of noise is the exhaust valve and the second one is the admission valve. The level of noise from the admission valve increases faster than that from the exhaust valve as the rotational speed of the engine increases. On the basis of theoretical analyses and experiments, admission a and exhaust mufflers with expansion chambers and microporous plates were installed and posses a good function of noise elimination and good properties of aerodynamics and structure because properly internal structure and optimum design parameters were adopted.更多还原