| With the increasing use of radar, more and more countries invest substantial human and financial resource for the research of radar system. At present, most of the GPR tests use the way of airborne. It has several drawbacks which separately are the waste of manpower and materials, the large error of measurement algorithm and test results and the long test cycle. Therefore, it has important significance to design a set of multi-functional, stable and reliable multi DOF test platform in the presence of external field for the simulation of prototype test.In this paper, the main work is to design a set of lifting platform which is suitable for millimeter-wave radar antenna. As the carrier of radar antenna, the main function of the lifting platform is to adjust the height of radar antenna and position accurately. The concrete research contents and innovation points mainly include following aspects.(1) General design of lifting platform. By comparing different lifting mechanism, the designing plan was chosen which meet the requirement of topic.(2) Design of transmission system. Transmission system was designed in order to go up and down radar antenna safely and stably. In addition, stability of screw jack mechanism was checked and the static analysis of mounting frame was carried out with the ANSYS software.(3) Design of driving system. According to topic requirements, reasonable driving mode was chosen and measures were taken to measure and limit height of radar antenna.(4) Research on meshing force simulation of worm transmission mechanism for lifting platform. Simulations of worm transmission mechanism in the dynamic meshing were carried out with the ADAMS software. Research pointed out that periodic fluctuation of meshing force was the main reason causing fatigue failure of worm transmission mechanism. Then measures were put forward to prolong working life and improve accuracy of worm transmission mechanism. Besides the problems of large vibration and impact were solved and guarantee for assessing performance characteristics of radar antenna more accurately was provided.(5) Self-excited vibration analysis of screw-nut auxiliary for lifting platform. In order to reduce the vibration and impact, the squeak noise and vibration were researched when screw jack mechanism goes down using Gallina two degrees of freedom model. Research showed that asymmetry of inertia matrix was the main reason causing self-excited vibration. Moreover, using MathCAD, the curves of friction coefficient, screw diameter and axial load impacting on system stability were got. The measurements of avoiding self-excited vibration were put forward. |
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