CAJ | 학술논문

为在变速器故障诊断中提取微弱的故障特征，提出了一种基于转速信号确定分数阶傅里叶变换( FR-FT)最佳阶次，并通过滤波提取变速器变速过程啮合阶比分量的方法。首先，根据输入轴转速信号和传动比，计算各挡位啮合频率分量，接着进行最小二乘拟合，以确定各分量FRFT的最佳阶次，最后在该最佳分数阶域进行滤波，获得对应的阶比分量。试验结果表明，根据转速信号确定FRFT最佳阶次，准确、快速、鲁棒性好，并具有自适应性；最佳阶次FRFT滤波能有效剥离其他分量和噪声，提取出目标阶比分量；对目标阶比分量进行单分量分析，能得到该分量更全面、细致、准确的信息。
위재변속기고장진단중제취미약적고장특정，제출료일충기우전속신호학정분수계부리협변환( FR-FT)최가계차，병통과려파제취변속기변속과정교합계비분량적방법。수선，근거수입축전속신호화전동비，계산각당위교합빈솔분량，접착진행최소이승의합，이학정각분량FRFT적최가계차，최후재해최가분수계역진행려파，획득대응적계비분량。시험결과표명，근거전속신호학정FRFT최가계차，준학、쾌속、로봉성호，병구유자괄응성；최가계차FRFT려파능유효박리기타분량화조성，제취출목표계비분량；대목표계비분량진행단분량분석，능득도해분량경전면、세치、준학적신식。
For extracting weak fault features in transmission fault diagnosis, a method is proposed to deter-mine the best order of fractional Fourier transform ( FRFT) based on rotational speed signal and extract meshing or-der component of transmission during shifting process by filtering. Firstly the meshing frequency components of each gear are calculated according to the rotational speed signal of input shaft and gear ratio. Then the best order of each FRFT component is determined by least square fitting. Finally the corresponding order component is obtained by fil-tering in that best fractional order domain. The test results show that the determination of best order of FRFT by ro-tational speed signal is accurate, fast, robust and adaptive; the filtering on the best order of FRFT can effectively peel off other components and noises and extract the target order component;By single component analysis on target order component, the more comprehensive, detailed and accurate information of that component can be obtained.