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首页> 外文期刊>Journal of Failure Analysis and Prevention >Differential Diagnosis of Spall versus Cracks in the Gear Tooth Fillet Region
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Differential Diagnosis of Spall versus Cracks in the Gear Tooth Fillet Region

机译：齿轮齿角区域裂痕与裂纹的鉴别诊断

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This paper presents a technique to differentially diagnose two localized gear tooth faults: a spall and a crack in the gear tooth fillet region. These faults could have very different prognoses, but existing diagnostic techniques only indicate the presence of local tooth faults without being able to differentiate between a spall and a crack. The effects of spalls and cracks on the behavior/response of gear assemblies were studied using static and dynamic simulation models. Changes in the kinematics of a pair of meshing gears due to a gear tooth root crack and a tooth flank spall were compared using a static analysis model. The difference in the variation of the transmission error caused by the two faults reveals their characteristics. The effect of a tooth crack depends on the change in stiffness of the tooth, while the effect of a spall is predominantly determined by the geometry of the fault. The effect of the faults on the gear dynamics was studied by simulating the transmission error in a lumped parameter dynamic model. A technique had previously been proposed to detect spalls, using the cepstrum to detect a negative echo in the signal (from entry into and exit from the spall). In the authors' simulations, echoes were detected with both types of fault, but their different characteristics should allow differential diagnosis. These concepts are presented prior to experimental validation in hopes that the diagnostic techniques will be useful in the failure analysis community prior to the validation by ongoing experimental testing of the concepts and the evaluation of how metallurgical defects may influence fault development and detection.
机译：本文提出了一种可区别诊断两个局部轮齿故障的技术：轮齿圆角区域的剥落和裂纹。这些断层的预后可能非常不同，但是现有的诊断技术仅表明存在局部牙齿断层，而无法区分剥落和裂缝。使用静态和动态仿真模型研究了剥落和裂纹对齿轮组件行为/响应的影响。使用静态分析模型比较了由于齿轮齿根裂纹和齿面剥落而导致的一对啮合齿轮的运动学变化。由两个故障引起的传输误差变化的差异揭示了它们的特性。牙齿裂纹的影响取决于牙齿刚度的变化，而剥落的影响主要取决于断层的几何形状。通过在集总参数动力学模型中模拟传输误差，研究了故障对齿轮动力学的影响。先前已经提出了一种技术，该方法使用倒谱来检测信号中的负回波（从进入和退出剥落中来），以检测剥落。在作者的模拟中，两种类型的故障都检测到了回波，但是它们的不同特征应该可以进行鉴别诊断。这些概念是在进行实验验证之前提出的，希望这些诊断技术将在验证之前通过概念的正在进行的实验测试以及对冶金缺陷如何影响故障发展和检测的评估对故障分析界有用。

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