关键词: 支持向量机, 性能劣化模型, 退化数据, 可靠性评估

Abstract: In order to solve the small samples problem in reliability assessment based on failure data of Numerical Control (NC) equipments, the method of degradation modeling based on Support Vector Machine (SVM) was proposed. After studying on modeling theories of SVM and the parameter optimization of SVM, the Least Squares Support Vector Machines tool (LSSVM.M) was used to process the performance degradation data. An improved parameter selection method was presented, which improved the veracity of simulation and forecasting. After validating by examples, the performance degradation model of NC machining accuracy was established, which laid foundation for reliability assessment.

Key words: support vector machine, performance degradation model, degradation data, reliability assessment, numerical control system