行星齿轮箱由于振动传递路径的时变性导致行星齿轮箱振动信号频谱具有复杂的调制边带,其包含了齿轮的故障信息.结合行星齿轮箱振动分离信号的同步平均和窄带解调法,提出了针对行星齿轮箱的窄带解调方法.对行星齿轮箱振动信号加窗截取,根据行星齿轮箱齿轮啮合齿序特征,将加窗截取信号拼接重构单个齿轮的振动分离信号,克服传递路径时变性的影响;对振动分离信号进行时域同步平均,提高信噪比;最后,对平均后的信号进行窄带解调,提取行星齿轮箱齿轮故障特征和故障位置.通过行星齿轮箱故障实验分析,验证该方法能有效的提取行星齿轮箱故障特征.%Planetary gear-box,due to the time-varying property of the vibration transmission path,leads to the complex modulation sidebands in its vibration signal spectrum,which contains abundant fault informations of the gear-box.A special narrowband demodulation method for the planetary gear-box was put forward,combining the synchronous average and narrowband demodulation or the vibration separation signals of the planetary gear-box.The window interception of the vibration signal was made,and according to the teeth order characteristics of the gear meshing of the planetary gear-box,the vibration signal of a single gear was reconstructed by the splicing of the window interception signals,to overcome the influence of the variation of the transmission path.The time domain synchronous averaging of the vibration separation signals,was utilized to improve the signal-to-noise ratio.The narrowband demodulation for the average vibration separation signals,was carried out,and finally,the fault characteristics and fault location of the planetary gear box were extracted.Through the experimental analysis,it was verified that the method can effectively extract planetary gear-box fault characteristics.
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