华中科技大学学报（自然科学版）Issue(6)：1-6,6.DOI:10.13245/j.hust.150601
发动机正时系统噪声诊断与降噪研究
Research of engine timing system noise diagnosis and reduction
摘要
Abstract
T he engine timing system noise as a research object had been processed by the coherent de‐tection and Hanning window function first .Then by the zoom fast Fourier transformation method combined with the order tracking method marked by the characteristic frequency function ,the noise source of engine belt driven timing system was diagnosed accurately and different effects between di‐rect and indirect noise reduction ways were tested and verified completely .The results indicate that the noise is aroused by the crankshaft gear′s meshing and belt span′s resonance .In an indirect way , high‐frequency noise above 1 .4 kHz was suppressed by a cover ,but noise below 1 .4 kHz became worse .In a direct way ,decreasing the belt initial tension value to 200 N can be effective in reducing noise .关键词
发动机/正时系统/噪声诊断/降噪/频谱细化/阶次跟踪Key words
engine/timing system/noise diagnosis/noise reduction/zoom fast Fourier transformation/order tracking分类
通用工业技术引用本文复制引用
李涛,陈特放,史铁林,周平..发动机正时系统噪声诊断与降噪研究[J].华中科技大学学报（自然科学版）,2015,(6):1-6,6.基金项目
国家自然科学基金资助项目（61273158）． （）
