高性能基础件的设计、分析及制造技术是国家核心竞争力的支撑之一。由多股钢丝卷制而成的多股螺旋弹簧（简称多股簧）作为重型装备、自动武器的复位基础件被广泛应用。多股簧的失效过程比一般弹簧的失效复杂，失效可以是加工过程中的参数控制不当造成，也可以是交变载荷下的疲劳破坏所致。本项目针对目前多股簧的服役特性和失效机理不明晰，没有专门针对多股簧的疲劳实验数据，研究多股簧非线性响应模型及其参数的智能识别方法，提出多股簧动态响应分析方法，研究多股多层螺旋弹簧冷缠绕过程中组织性能变化规律，揭示多股簧冷缠绕及热处理工艺与其失效形式、疲劳寿命的映射规律，探明承受交变冲击力和微动磨损作用的多股簧疲劳破坏机理，提出多股簧动态响应分析方法并与前期研究成果一起为多股簧的设计、制造、分析提供一套完整的解决方案，为相关装备复位装置的动态响应性能和可靠性的提升提供理论支撑和技术保障。

The designing, analyzing and manufacturing technology of high performance basic parts is one of the critical technologies that are supporting the core competitiveness of the country. The stranded wire helical spring, which is composed of multiple steel wires, is widely used in heavy machinery and automatic weapons as basic reposition component. The failure of the spring is a problem much more complex than that of a conventional spring. It can be caused by inappropriate processing parameters and/or alternating load. The dynamic response characteristics and the failure mechanism of the spring are not clearly revealed. Focusing on this problem, the current work intends to 1) study the nonlinear response model of the spring as well as the parameter identification method for the model; 2) come up with an analysis method for the aforementioned response model; 3) study the principle of the transformation of the metallographic structure of the wire during manufacturing and reveal the relationship between the failure of the spring and the technological parameter of the manufacturing and heat treatment process. The failure mechanism of a stranded wire helical spring under altering load and fretting wear will be clearly revealed. The response analysis method proposed by this work, together with our previous work, will be able to provide a comprehensive solution to the design, manufacturing and analysis of the spring and theoretical and technical support for improving the dynamic response and reliability of relevant machinery.