多模式失效的叶盘耦合寿命可靠性分析方法研究

Accurate prediction on lifetime and reliability for blade-disk coupling structure in multi-mode failure is one of the key technologies in high-performance aeroengine development. This project focuses on the failure lifetime reliability design of aeroengine blade-disk coupling structure with multi-mode failure, multi-site damage and multi-component coupling. Based on distributed collaborative mechanism, this project proposes multi-mode, multi-site and multi-component collaborative response surface methods based on dynamic substructure to achieve lifetime prediction and reliability analysis for blade-disk coupling structure. The main contributions are as follows: The multi-mode collaborative response surface method based on dynamic substructure is proposed to deal with the failure lifetime probability analysis of each failure point considering multi-mode collaboration; And then, The multi-site collaborative response surface method based on dynamic substructure is proposed to analyze the lifetime reliability of blade and disk in multi-mode failure considering the multi-site damage correlation; Finally, The multi-component collaborative response surface method based on dynamic substructure is proposed to develop lifetime reliability analysis of blade-disk coupling structure in multi-mode failure considering the multi-component correlation. This project provides an effective method to solve the reliability design problems of complex assembly structure system, and has important academic value for the enrichment and development of the reliability theory and method of mechanical structure design.

准确预测多模式失效的叶盘耦合寿命及可靠性，是新型高性能航空发动机研制的关键技术之一。本项目围绕涉及多模式失效、多部位相关、多构件耦合的航空发动机叶盘结构失效寿命可靠性设计这一工程背景，以先分解后耦合的分布式协同机理，采取逐层递进的方式，研究提出基于动态子结构的多模式、多部位、多构件协同响应面方法，实现多模式失效的叶盘耦合寿命预测及可靠性分析，主要研究内容包括：提出基于动态子结构的多模式协同响应面方法，实现多模式协同的叶盘构件各部位失效寿命概率分析；提出基于动态子结构的多部位协同响应面方法，实现多部位协同的叶盘构件多模式失效寿命可靠性分析；提出基于动态子结构的多构件协同响应面方法，实现多构件协同的叶盘耦合结构多模式失效寿命可靠性分析。本项目为解决复杂结构系统可靠性设计这一类问题提供了有效方法，对丰富和发展机械结构可靠性设计理论和方法具有重要的学术价值。

准确预测高低周复合载荷下的叶盘耦合寿命和可靠性，是新型高性能航空发动机研制的关键技术之一。本项目围绕多场时变载荷下的航空发动机叶盘耦合结构失效寿命概率设计这一工程背景，考虑静/动态响应相关性、高/低周疲劳相关性和耦合性、同应力多危险部位相关性，探索复杂装配结构系统可靠性一体化仿真分析方法，研究高低周复合载荷作用下的叶盘寿命概率分析，主要包括：研究基于子结构的分布式协同响应面方法，实现考虑静、动态响应相关性的叶盘构件高、低周疲劳寿命概率分析；研究基于子结构的多目标分布式协同响应面方法，实现考虑多危险部位相关性的叶盘构件高低周复合疲劳寿命概率分析；研究基于子结构的多级多目标分布式协同响应面方法，实现考虑构件相关性和耦合性的叶盘耦合结构高低周复合疲劳寿命概率分析。本项目为解决复杂装配结构系统可靠性设计这一类问题提供了有效方法，对机械结构可靠性设计理论和方法的丰富和发展具有重要的学术价值。