大型车载雷达抗风稳定性研究

摘要

Wind load is the main load that the radar antenna structure of large vehicle-borne radar withstands . The wind-resistant stability is directly related to the safety of the whole structure and is a key factor which de-termines the success of the overall design .No effective analysis method has been formed for such problems in radar structure design .Methods usually adopted such as torque law method , multi-body dynamics method and iterative method based on linear problems all have some limitations .In this paper , the stability of a large do-mestic vehicle-borne radar is investigated , and a set of nonlinear finite element analysis methods based on multi-contact algorithm are established to overcome the limitations of existing analysis methods .By reasonable simplification of the vehicle-borne structure and detailed simulation of the boundary conditions of multi-sup-porting legs , the wind-resistant mechanical response of the large vehicle-borne radar is obtained .The correla-tion of the contact forces , rising displacements of supporting legs and the gravity center of radar antenna with the direction and magnitude of wind force is studied for the first time .The results provide certain theoretical basis and design guidance for the wind-resistant stability design of large vehicle-borne radars .%风载荷是大型车载雷达天线结构所承受的主要载荷，其抗风稳定性设计直接关系到整机结构的安全性，是决定结构总体设计方案成败的关键因素。这类问题目前在雷达结构设计中尚未形成有效的分析方法，通常采用的力矩法、多体动力学法和基于线性问题的反复迭代法均存在一定的局限。文中针对国内某大型车载雷达的抗风稳定性问题进行研究，为克服现有分析方法的局限，建立了一套基于多接触算法的非线性有限元分析方法。通过对车载雷达结构的合理简化以及多支撑腿边界条件的细致考评和准确模拟，获取了大型车载雷达的抗风力学响应。首次考察了支撑腿接触力、抬腿量和上装重心随风向和风力的变化规律，分析结果可为此类大型车载雷达的抗风稳定性设计提供一定的理论基础和设计指导。