典型膜单元结构气动参数模型研究

It is common that the interaction of wind and membrane strutures leads to the wind-induced disasters. As the complexity of wind-structure interaction, it can introduce of aerodynamic parameters, such as added mass, aerodynamic damping and pneumatic stiffness, to approximately describe the coupling effects during membrane structures vibration. Therefore, aerodynamic parameters of membrane structures are very important for estimating the wind response on membrane structures. In this proposal, the study on aerodynamic parameters of membrane element structures will be conducted, mainly include: 1) Through the vibration tests of membrane element structures in still air with varying air pressures, the influence of aerodynamic parameters on the vibration of the structure will be separated, the aerodynamic parameters of membrane element structures in still air will be obtained; meanwhile, through wind tunnel tests data, the aerodynamic parameters under wind flow will be obtained. 2) Dynamic coupling equation to numerically analysis wind and membrane element structures will be established by using the Boundary Element Method. Then, the calculation method of aerodynamic parameters of membrane element structures will be established. 3) This proposal will put forward equivalent model of aerodynamic parameters of membrane element structures, the vibration test of membrane element structures in still air will verify this equivalent model, and wind tunnel tests data will ascertain the applicability and rationality of the equivalent model under the wind. This equivalent model will provide a reasonable simplify analysis for the designer to consider the aerodynamic characteristics of membrane structures. Therefore, this project will be of important theoretical significance and practical application prospects. The potential findings of this project will provide support to research on wind-induced vibration mechanisms of membrane structures when considering fluid-structure interaction.

膜结构因与风的流固耦合效应导致风致灾害较为普遍。鉴于风与膜结构耦合作用的复杂性，可通过引入附加质量、气动阻尼和气承刚度等气动参数近似描述膜结构在振动中的流固耦合效应。因此，准确地确定膜结构的气动参数，对于预估膜结构的响应是非常重要的。本课题拟对膜单元结构气动参数进行研究，主要包括：1）通过多种气压下膜单元结构振动测试，分离气动参数对结构振动特性的影响，获取膜单元结构在静风下的气动参数；通过风洞试验数据获取来流风下的气动参数。2）基于边界元方法建立风与膜单元结构耦合方程，构建膜单元结构气动参数计算方法。3）建立典型膜单元结构气动参数等效模型，通过静风试验验证该模型的正确性，并通过风洞试验数据验证该模型在来流风下的适用性和合理性，从而为膜结构设计中考虑膜结构气动特性提供简化分析的合理等效模型，具有很好的理论意义及工程应用价值。研究成果将为揭示膜结构考虑流固耦合效应下风振响应研究提供科学基础。

膜结构因与风的流固耦合效应导致风致灾害较为普遍。鉴于风与膜结构耦合作用的复杂性，可通过引入附加质量、气动阻尼和气承刚度等气动参数近似描述膜结构在振动中的流固耦合效应。因此，准确地确定膜结构的气动参数，对于预估膜结构的响应是非常重要的。本课题对膜单元结构气动参数进行研究，主要包括：1）通过多种气压下膜单元结构振动测试，分离了气动参数对结构振动特性的影响，获取了膜单元结构在静风下的气动参数；2）对平面圆形、平面三角形薄膜、方形膜、曲面圆膜和曲面方形膜静风耦合振动进行了数值分析，通过与已有的试验数据的比较验证了数值模拟方法的可行性，研究了薄膜的厚度、特征尺寸、预应力等参数对气动参数的影响，同时针对伞形膜在有风情况下的振动特性进行了数值风洞研究，得出空气作用对薄膜风振特性的影响。3）建立了典型膜单元结构气动参数等效模型，包括静风下膜单元结构气动参数简化模型，封闭膜结构气动参数等效模型和开敞式薄膜结构气动参数等效模型，通过静风试验和来流风试验验证等效模型的正确性，从而为膜结构设计中考虑膜结构气动特性提供合理等效模型，具有很好的理论意义及工程应用价值。研究成果可以为揭示膜结构考虑流固耦合效应下风振响应研究提供科学基础