空间结构的气动稳定性分析

空间网壳及索膜结构由于外观形状复杂，结构的振动也不是以单一振型为主，因此传统的节段模型气动稳定性判别式不再适用，根据大跨空间结构的特点，考虑弛振临界风速与相应来流攻角的关系，并同时考虑了侧向气动力以及侧向气动力与竖向气动力的相互作用，推导了采用体型系数而不是升力系数和阻力系数表示的临界风速判别式，通过算例结果分析表明，如果忽略来流攻角和侧向气动力，对大跨空间结构的驰振临界风速有较大的影响。

Aerodynamic Stability Analysis of Space Structures

The traditional aerodynamic segment model stability discriminent is not suitable for spatial dome and cable membrane structures owing to their complex shape and various vibration modes. According to the characteristics of large spatial reticulated structures, this paper derived the galloping critical wind speed discriminent expressed with shape coefficient rather than lift and drag coefficient when taking into account the initial attack angle and lateral aerodynamic force and mutual interaction between vertical aerodynamic force and lateral aerodynamic force. The numerical analyses of examples show that the galloping critical wind speed of large spatial reticulated structures will be greatly effected if these factors are omitted.