复合材料损伤构件颤振速度计算新模型及其软件开发

Flutter speed calculation of composite material damage components is a key problem for high speed craft analysis. Based on the existing software platform, the project introduces some new types of air spring elements, analytical-isogeometric finite elements and shell elements containing defects. This project will develop the related professional software, and will focus on the following key problems:. Based on the existing achievements, a new type of air spring element model for flutter analysis will be studied. The additional aerodynamic force on the shell element in different air dynamics assumptions will be calculated in the new equivalent spring element, in which nonlinear model for additional aerodynamic force is still a great challenge. According to the analytical trial function method, composite material analytical-isogeometric element will be derived to match the precision of component geometry model. On the other hand, to simulate composite damage component, new shell element containing delamination or hole will be studied. Combining with the existing interface software module for the geometric model used in commonly engineering software, the professional analysis software with independent intellectual property rights will be developed to calculate the flutter speed of the composite material damage component. It can service related industries of our country. . The project makes the best use of the existing software platforms and research achievements. By solving some key challenges of the flutter analysis, the achievements of the project will be integrated into one professional software platform of the flutter speed calculation in the composite structures.

复合材料损伤构件的颤振速度计算是高速飞行器分析的难点。本项目在已有软件平台的基础上，引入新型空气弹簧单元、等几何解析单元和含缺陷板壳单元，开发相关专业软件。拟解决以下关键问题：. 在申请人已有成果的基础上，研究颤振分析的新型空气弹簧单元模型，开发适用于不同空气动力学假设下的附加气动力等效弹簧单元，重点突破板壳单元自由度与单元附加气动力之间非线性模型的快速计算难题；在原有解析试函数单元的基础上，开发与构件几何模型精度相匹配的复合材料等几何解析单元；另外，在含损伤复合材料构件模型中，构造含分层和含孔洞板壳有限元新模式。结合已有工程常用软件几何模型接口软件模块，开发一套具有自主知识产权的复合材料损伤构件颤振计算的专业分析软件，服务国家相关行业。. 该项目充分利用已有软件平台和科研积累，通过颤振分析中关键技术的开发，实现较系统复合材料构件颤振分析专业软件的集成。

复合材料损失构件的颤振速度快速计算对于飞行器安全评估是一个重要内容。针对悬臂型复合材料板壳构件，本项目提出了新型的快速颤振频率计算方法和相应的颤振速度计算方案，开发了相应的有限元计算软件，提出了相关的新型单元模型。项目的主要成果有：. 1、提出了悬臂型构件颤振模型的弯扭耦合理论。. 2、给出了悬臂型构件颤振频率的快速计算方法。. 3、推导了基于空气弹簧负刚度理论的颤振计算模型。. 4、提出了复合材料板壳单元的超协调理论，突破了单元理论局限于协调元和非协调元的传统思路。. 5、提出了复合材料构件分层损伤的刚度折减理论。. 6、开发了复合材料损伤构件颤振分析计算软件模块，实现了原有软件ADGS的版本升级。