To address the problems that the reliability data samples of remanufactured products were scarce, leading to difficulties in accurately predicting their reliability status during service, a dynamic reliability prediction method for remanufactured products was proposed, integrating substance-field degradation data from similar products with model transfer fine-tuning. Firstly, the “physical form” and “field properties” degradation indicators affecting product reliability were analyzed using the substance-field model. Then, a comprehensive degradation index reflecting the multi-dimensional substance-field degradation characteristics of products was constructed using a linear regression model, and a three-stage similarity calculation method was designed to screen and transfer historical degradation data from similar products for sample expansion. Secondly, to address the spatial coupling and temporal dependency characteristics of the historical substance-field degradation data of similar products, a reliability prediction model was established based on a convolutional long short-term memory neural network. Furthermore, the parameters of the prediction model were dynamically adjusted through deep transfer learning techniques to improve the prediction accuracy for the reliability of remanufactured products under personalized service scenarios. Finally, the proposed prediction method was validated using a remanufactured spindle system as a case study, and the coefficient of determination (R²) of the prediction results reache 0.92, which indicates the effectiveness of the method.
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