Study On Wind Load Characteristics Of Vehicle-borne Radar Antenna And Platform

Antenna is an importance component of vehicle-borne radar system as the equipment of transmitting and receiving electromagnetic wave. The enough surface precision, intensity and rigidity are needed for the antenna, but the space and weight are limited at the same time, therefore the contradictions exit between space and rigidity, rigidity and weight. The features of quick setting up and disassembling vehicle-borne radar sharpen the contradictions. With the enlargement of the span of these structures, it is inevitable to use light-weighted materials, which make these structures sensitive to wind load. Therefore, the effects of wind load, especially the dynamic wind load become significant during the design stage. But the wind load design for this structure isn't normative in existing Chinese wind-load criterion. So it's urgent for the vehicle-borne radar antenna to propose a kind of proper wind response analysis method.This thesis summarized recent research on the vehicle-borne radar antenna home and abroad, analyzed the wind effect on the radar antenna, such as the wind pressure produced by the average wind-load and dynamic effects on antenna resulted from dynamic wind frequency feature. An effective method was presented to calculate the average wind-load pressure with the help of the wind-load theory in architecture. Furthermore, the radar vehicle wind-load stability was analyzed.The free vibration of radar antenna was analyzed and the resonance frequency to prompting was concluded, which is a great help to antenna resisting wind-load project. Then the antenna mathematic model and finite element analysis model were constructed based on the random vibration theory, and the random respond of the antenna finite element model was analyzed by using the ABAQUS software. The primary works focused on wind-load frequency analysis and wind response simulation analysis for a type of vehicle-borne radar antenna. Comparing the result with the theory calculating, the wind-induced vibration calculation method is proved to be correct.Subsequently, the vibration characteristic of vehicle-borne radar antenna platform was studied. The platform mathematic model and finite element analysis model are constructed based on the random vibration theory. And the vibration response of platform was analyzed, which is useful to radar vehicle optimization design. Finally, the further research is done on the static-wind stability and wind-induced response of vehicle-borne platform. The work done in this thesis will provide foundation for further study of radar mobility.