Gearbox Vibration Signal Amplitude and Frequency Modulation
Gearbox Vibration Signal Amplitude and Frequency Modulation
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DOI：
10.3233/sav-2011-0656
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发表时间：
2012
影响因子：
1.6
通讯作者：
F. Chaari;W. Bartelmus;R. Zimroz;T. Fakhfakh;M. Haddar
中科院分区：
文献类型：
--
作者：
F. Chaari;W. Bartelmus;R. Zimroz;T. Fakhfakh;M. Haddar
在使用过程中，齿轮箱通常是在波动载荷条件下运行的，但现有的文献大多描述了固定载荷条件下的齿轮箱模型。已发表论文的主要任务是为故障检测建立故障模型。考虑到工业的实际情况，负荷条件的平稳假设不能再维持下去。在维护操作中监测发出的振动信号与上述模型不同（由于负载的非平稳性），并且可能难以分析，从而导致系统的错误诊断。本文的目的是研究时变载荷条件对齿轮箱动态特性的影响。为了研究这一点，对一个简单的无缺陷直齿齿轮系统进行了建模。它受到时变载荷的作用。考虑了驱动电机的转速-转矩特性。载荷的变化引起速度的变化，从而引起啮合刚度周期的变化。计算机模拟显示，深度振幅调制与边带没有不同，当有缺陷的牙齿。为了体现时变负荷的影响，首先采用短时傅里叶变换，然后采用平滑维格纳-维尔分布。结果表明，最后一种方法非常适合所研究的实例。
Gearboxes usually run under fluctuating load conditions during service, however most of papers available in the literature describe models of gearboxes under stationary load conditions. Main task of published papers is fault modeling for their detection. Considering real situation from industry, the assumption of stationarity of load conditions cannot be longer kept. Vibration signals issued from monitoring in maintenance operations differ from mentioned models (due to load non-stationarity) and may be difficult to analyze which lead to erroneous diagnosis of the system. The objective of this paper is to study the influence of time varying load conditions on a gearbox dynamic behavior. To investigate this, a simple spur gear system without defects is modeled. It is subjected to a time varying load. The speed-torque characteristic of the driving motor is considered. The load variation induces speed variation, which causes a variation in the gearmesh stiffness period. Computer simulation shows deep amplitude modulations with sidebands that don't differ from those obtained when there is a defective tooth. In order to put in evidence the time varying load effects, Short Time Fourier Transform and then Smoothed Wigner-Ville distribution are used. Results show that the last one is well suited for the studied case.