某型机载雷达支座振动特性研究

发布时间：2019-02-14 23:10

【摘要】：机载雷达支座作为支撑相控阵雷达阵面板的装置,实现其材料的合理布局和结构最优化,满足机载雷达轻量化、高精度、小位移、低频隔振等力学性能要求,已成为愈发重要的研究课题。本研究对某型机载雷达支座振动性能进行研究,主要针对雷达阵面板加强筋和雷达支架两个部分。针对原雷达阵面板加强筋结构,结合样条有限元法对薄板振动问题进行研究探讨,通过拓扑优化重新构建雷达阵面板加强筋形状,进而对拓扑优化的加强筋形状尺寸进行优化,获得设定优化条件下的最优解。经过拓扑优化和尺寸优化,雷达阵面板加强筋体积显著减小,前六阶模态在主要工况和次要工况下均得到有效提高,振动变形和冲击变形均得到改善。鉴于现有雷达支座以刚性的方式连接于飞机腹板,飞机的振动冲击没有得到有效的缓冲,本研究对雷达支座和飞机腹板的连接部位进行隔振设计。综合考虑雷达工作工况和隔振器安装空间等因素,选择采用碟型弹簧柱和柔性杆组成的复合结构实现扁平空间内的被动隔振。通过计算机模拟仿真,结合实际测量数据,明确该隔振器在主要隔振方向上具有低频隔振效果。
[Abstract]:The airborne radar support is used as the device to support the phased array radar array panel, which realizes the reasonable layout and structure optimization of the material, and meets the requirements of airborne radar such as lightweight, high precision, small displacement, low frequency vibration isolation and so on. It has become an increasingly important research topic. In this paper, the vibration performance of a certain airborne radar support is studied, which is mainly focused on the reinforcement of radar array panel and the radar support. In view of the reinforced reinforcement structure of the original radar array panel, the vibration problem of thin plate is studied by using spline finite element method, and the shape of reinforcing reinforcement bar of radar array panel is reconstructed by topology optimization, and the shape and size of reinforcing reinforcement bar are optimized by topology optimization. The optimal solution is obtained under given optimization conditions. Through the optimization of topology and size, the volume of reinforcement bars of radar array panel is significantly reduced, the first six modes are improved effectively under main and secondary conditions, and the vibration deformation and impact deformation are improved. In view of the fact that the existing radar support is connected to the web of the aircraft in a rigid manner and the vibration impact of the aircraft is not effectively cushioned, the vibration isolation design of the connecting part of the radar support and the aircraft web is carried out in this study. Considering the working condition of radar and the installation space of isolator, the passive vibration isolation in flat space is realized by using a composite structure composed of disc spring column and flexible rod. Through computer simulation and actual measurement data, it is clear that this isolator has low frequency vibration isolation effect in main isolation direction.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN957

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