Monitoring tooth profile faults in epicyclic gearboxes using synchronously averaged motor currents: Mathematical modeling and experimental validation
Monitoring tooth profile faults in epicyclic gearboxes using synchronously averaged motor currents: Mathematical modeling and experimental validation
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DOI：
10.1016/j.ymssp.2016.07.007
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发表时间：
2017-02
影响因子：
8.4
通讯作者：
J. Ottewill;A. Ruszczyk;D. Broda
中科院分区：
文献类型：
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作者：
J. Ottewill;A. Ruszczyk;D. Broda
时变的传输路径和不可达性会增加采集和处理振动信号以监测行星变速箱的难度。最近的工作表明，为了诊断平行轴变速箱的齿故障，可以将同步信号平均法应用于测量的电机电流。本文对该方法进行了进一步的改进，使其也可应用于行星变速箱的齿面故障监测。介绍了一种行星变速箱的低自由度模型，该模型包含了模拟牙齿故障的可能性，以及由于这些故障而导致的任何后续牙齿接触损失。通过将该模型与感应电机的简单空间相量模型相结合，可以证明，从理论上讲，行星变速箱中的齿故障可以从电机电流中识别出来。将同步平均方法应用于实验记录的电机电流和从轴上安装的编码器记录的角位移，验证了这一发现。通过实验和理论的比较，着重分析了工作条件、齿隙和联轴器对齿故障电流激励下的暂态响应的影响。结果表明，该方法可能是一种可行的替代或补充更传统的方法来监测变速箱。然而，一般的观察也表明，进一步研究该方法的敏感性和稳健性将是有益的。
Time-varying transmission paths and inaccessibility can increase the difficulty in both acquiring and processing vibration signals for the purpose of monitoring epicyclic gearboxes. Recent work has shown that the synchronous signal averaging approach may be applied to measured motor currents in order to diagnose tooth faults in parallel shaft gearboxes. In this paper we further develop the approach, so that it may also be applied to monitor tooth faults in epicyclic gearboxes. A low-degree-of-freedom model of an epicyclic gearbox which incorporates the possibility of simulating tooth faults, as well as any subsequent tooth contact loss due to these faults, is introduced. By combining this model with a simple space-phasor model of an induction motor it is possible to show that, in theory, tooth faults in epicyclic gearboxes may be identified from motor currents. Applying the synchronous averaging approach to experimentally recorded motor currents and angular displacements recorded from a shaft mounted encoder, validate this finding. Comparison between experiments and theory highlight the influence of operating conditions, backlash and shaft couplings on the transient response excited in the currents by the tooth fault. The results obtained suggest that the method may be a viable alternative or complement to more traditional methods for monitoring gearboxes. However, general observations also indicate that further investigations into the sensitivity and robustness of the method would be beneficial.