The concept and grading method of the "martensitic grade" in the standard of "Metallographic test for Carburizing AutoGear" were analyzed and discussed according to the experience and test results.
With auto-power spectrum and cepstrum, this paper diagnoses the unusual noise source of the gear box, and finds an impaired gear of the box.
本文采用自功率谱、逆频谱方法对拖拉机变速箱异常噪声源进行了诊断，找出了产生异常噪声的根源。
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Base on the analysis of the usual measure column gear teeth distance error, we rebuilt the usual measure way, and design a king of auto measure way for column gear teeth distance error.