J-50A集材拖拉机降噪研究

A Study on Noise Reduction of J-50A Timber-Collecting Tractors

为使J—50A集材拖拉机驾驶员耳旁噪声由100 dB(A)左右降到目前国际最低标准90 dB(A)以下,运用现代声源测试、分析技术,查明影响耳旁噪声的主噪声源是发动机进气与表面辐射噪声。经采取从架驶室内移出发动机空滤器、在发动机左侧软帘上附加阻尼隔声塑料软板、在驾驶室地板上加垫橡胶板等简易且极少增加成本的综合降噪措施,获得了耳旁噪声降至88～91 dB(A)的良好效果。

For the purpose of reducing the noise at the J - 50 timber - collecting tractor operator' s ears from 100 dB(A) to 90 dB(A) and below, at present the lowest international standard, the authors proved through investgation by modern measuring and analyzing technology of noises that the main sources of noises at the operator' s ears are the engine inlet valves noises and the surface radiation noises. By adopting comprehensive,simple and low cost measures such as moving the engine air filter out of the driver' s cab, attaching accoustic sound-insulating plastic plate on the left-side soft curtain of the engine and adding rubber pal on the cab floor, the authors achieved good results in the reduction of noises at the operator' s ears down to a level of 88-91 dB(A).