The FMECA method can effectively guide the reliability allocation of CNC machine tools.But in the analysis process,the influence of the randomness and fuzziness of decision-making experts,and the maintainability of subsystems is ignored.A reliability al-location method based on improved FMECA method and maintainability for CNC machine tools was proposed.In the process of hazard analysis,the cloud model was used to quantitatively represent the evaluation values of decision-making experts,the impact of randomness and fuzziness on the evaluation results was solved effectively.During the analysis process,considering the influence of maintainability,an improved RPN method based on cloud models(C-RPN)was established to achieve reasonable allocation of reliability for the subsystems of CNC machine tool.Finally,the advantages of the proposed method were demonstrated by comparing with traditional methods.
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