| Small diesel engine driven generator sets are essential equipment for emergency use.Especially under certain situations like natural disasters and accidents,diesel engine generators can assure rescue work be carried out as soon as possible.However,generator sets can cause serious noise problem,not only affecting the normal work and life of nearby personnel,but also damage the human health.Low-noise generator sets development is an essential work.This dissertation aims at a small diesel engine generator set as research object,and by optimizing the sound insulation hood of the generator set;noise control is carried out from the perspective of propagation path.Noise source identification and character analysis of a small diesel engine generator set is carried out by experimental ways..The main noise sources and noise characteristics were obtained.From the experimental results,noise energy of the whole unit was estimated.Noise source of the generator set is complex in this research.Thus,a proper design and optimization of acoustic enclosures are the focus of this dissertation to reduce the radiated noise of the generator set.Based on the results,the design scheme and optimization measures of sound insulation cover are put forward.For low frequency range,structure quality of plated is confirmed to be the key influencing factor of transmission loss,and topological optimization is carried out.Transmission loss below 1000 Hz is 13.16 dB(A).For middle-high frequency range spread through air vent of the enclosure,considering high-order sound wave propagated in air duct,baffle position and window width is the key factor influencing transmission loss,and optimized by genetic algorithm to suppress high-order sound wave.Transmission loss of air duct silencer is 30.3dB(A).This method is verified by a test and sound pressure level of the generator set at a distance of 7 m is reduced to 60.8 dB(A).The results provided a reference for the improvement of sound radiation performance of generator set. |
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