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文章通过轮对的受力分析，并按以下两种情况，导出了轮对临界脱轨的准则：一种情况为假设轮轨间出现摩擦滑动的经典方法，另一种情况为考虑轮轨间蠕滑的近似解析方法。按经典方法导出的轮对脱轨条件为：ＬＶ＋ｔａｎδＬ－μ１＋μｔａｎδＬ＋δＲ＋μ１－μδＲη－ｔａｎδ
Based on the analysis of the wheelset forces and the following two cases, the paper deduces the criteria for the critical derailment of wheelsets. One is the classic method of assuming frictional sliding between wheel and rail, and the other is considering the creep between wheels and rails Approximate method of sliding analysis. The wheelset derailed conditions derived according to the classical method are: LV + tanδL-μ1 + μtanδL + δR + μ1-μδRη-tanδ