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在特征提取部分的基础上，引入多传感器信息融合的思想，在特征层对多源信息进行信息融合。首先引入征据理论，给出了特征层信息融合的通用实现框架，并结合非线性耦合特征，提出非线性耦合特征基本概率指派函数的构造方法和证据组合方法，实现了非线性耦合特征的综合优化，并结合实际诊断对象，以齿轮实验台为例实现了非线性耦合特征的综合优化，证明所提出方法的正确性和有效性。
Based on the feature extraction, the idea of multisensor information fusion is introduced, and the information fusion of multi-source information is carried out in the feature layer. First of all, the theory of evidence is introduced and a general framework of information fusion at the feature level is given. Combined with the nonlinear coupling features, the construction method and the evidence combination method of the basic probability assignment function of nonlinear coupling feature are proposed to realize the synthesis of nonlinear coupling features Optimization, combined with the actual diagnosis of the object to gear test bench as an example to achieve a comprehensive optimization of nonlinear coupling characteristics to prove the correctness and effectiveness of the proposed method.