雷 达 罩 在 强 风 作 用 下 失 效 过 程 及 易 损 性 分 析

Radomes are widely used in military and civilian facilities, yet they often suffer severe damage under wind loads. Therefore, the analysis of structural failure modes and vulnerability of radomes is of great significance. Firstly, large eddy simulation was used to simulate the wind load distribution characteristics on the surface of the radome structures. The wind load distribution characteristics were obtained for three types of radomes with different base heights, and high-precision fitting was performed using functions. The results showed that the wind load magnitudes were much higher than the shape coefficients of wind load on the top of rotating shells specified in the codes, and increasing the base height mainly affected the shape coefficient on the leeward side of the radome. Additionally, the improved Hashin criterion and Tserpes' stiffness degradation criterion were used to analyze the entire failure process of the radomes. Based on this, an analytical framework for the wind-induced vulnerability of radomes was proposed, in which the number of failed elements was used as the damage indicator and quantitative values for three failure states were provided. A Kriging surrogate model was constructed to predict the failure probability of the radome structures, providing a basis for evaluating their wind-resistance limit performance and estimating damage degrees. The results showed that structural instability of the radomes could be triggered by failure of only a few elements. At low wind speeds, the probability of failure increased with the base height, whereas at high wind speeds, increasing the base height beyond 12 m had no significant effect on the failure probability of the radomes.