Research On Thermal Analysis Technology For The Large Deployable Antenna

In this paper, for designing a large deployable antenna, the thermal analysis technology is deeply studied based on CAD/CAE, thermal-structure integrative analysis and latest researching results in the word. Research methods of thermal optimal design are used to settle the problem of thermal analysis for the deployable antenna. The paper includes the following contents:1. Thermal control technology for space-borne antenna (including thermal design, thermal analysis and thermal test) to home and abroad studying current situation and the developing trend have carried out a summary. It has summed up the designing principle and the step, given the framed structure of thermal analysis technological process with space-borne antenna. The methods of thermal-structure integrative analysis on studying space-borne antenna are brought forward.2. Specifically for complicated antenna structure, in order to improve accuracy and speed for calculating outer thermal flux of the earth albedo and emitted radiation, it has suggested that the approach adopt the Monte-Carlo method to calculating outer thermal flux of the space-borne antenna.3. To complicated antenna's truss structure for shading problem of the different heat sources, the method adopt the light projection algorithm to calculate outer thermal flux with direct sun radiation is brought forward. It deduce the formula to calculate shading factors between truss rods or antenna faces.4. Towards structure characters of the large deployable antenna, it establish the finite element of thermal analysis scheme and propose the calculating on-orbit working condition. The transient temperature on-orbit is calculated for the peripheral truss deployable antenna on satellite. For the first time, the antenna's temperature distribution witch is in different work area in the full orbit has carried out completely under working condition. The thermal analysis result has practical significance to the antenna's thermal control.5. Using the Thermal-Structure integrative analysis method, it can figure out thermal loads of equivalent node resulted from the temperature of truss pole element which is the primary structure of the deployable antenna, and it also construct the relevant finite element equation of thermal elasticity. The thermal distortion and thermal stress of the peripheral truss deployable antenna on satellite have been solved, and completely analysis, for the first time, the effect to RMS of the reflector surface that antenna with different location on orbit, thermal physics parameter, constraint position. and then given out the thermal control scheme that satisfy the projects design required.6. It completely analysis many factors which effected the temperature level, temperature grads of antenna on satellites, Using the TMG and orthogonal test as test scheme, we do many simulation analysis. Based on these, It establish the thermal-structure coupling mathematics module of antenna on satellite for optimize design; adopting the mixed genetic algorithms which is composed of the improved base genetic algorithms and simulated annealing, it has manipulate the optimized design of the antenna thermal parameters.7. It has studied the influence of thermal environment on-orbit to the net surface adjustment results on the ground. It proposed the method of adjustment and optimization of the peripheral truss net surface integrating distance weighted factor and the genetic algorithm based on-orbit thermal environment for the first time, Optimization adjustment simulation of the net surface has been carried based on-orbit thermal environment for the large deployable antenna.The research of thermal analysis technology in this article would provide more scientific foundation for thermal design of antenna on satellite, it would greatly improved thermal design level for satellite antenna of our country, the thermal optimize design which were based on those would effective reduce the costs of test. we hope the thermal analysis technology for antenna on satellite of our country will be more systematically, perfectly through the research of this article, consequently improve the electronic performance of antenna.