Parameterized Modeling And Thermal Deformation Analysis For Paraboloid Antenna Reflector

Antenna is an important tool of information transmission on the spacecraft.When the spacecraft is in orbit during operation,the antenna is influenced by solar radiation and cryogenic background.The temperature range can be achieved-200 °C to 180 °C.The thermal deformation is therefore induced and this can damage the performance of the antenna.As development of high precision antenna,thermal deformation on the performance of antenna is more significant and thermal stability becomes a key issue for design of high precision antenna.In order to develop the high precision antenna,it is necessary to predict the thermal deformation and the change of antenna performance.At present,universal CAE software can analyze the thermal deformation of antenna in different temperature fields,but the problem is unable to obtain the influence of thermal deformation on the performance of antenna.In this article,the direct precision and surface precision due to thermal deformation are studied.MSC.PATRAN/NASTRAN was re-developed using the secondary development tool PCL(Patran Command Language)based on least square method and rigid body kinematics.The parameterized modeling,paraboloid fitting and precision analysis were introduced into the finite element calculation.The thermal deformation analysis system for antenna reflector was developed.Many functions such as parameterized modeling,paraboloid fitting,precision analysis of antenna reflector and specific temperature field were solved in the system.The system can be used for predicting and analysing the thermal deformation of antenna reflector.The thermal deformation of large composite antenna reflector in different temperature fields was simulated to acquire the best layer-laying method and the performance indexs of antenna after deformation.The simulation results show that we searched out the layer design method for reducing heat-distortion and thermal deformation,paraboloid fitting parameters and precision obtained by numerical simulation agree with design requirements,which is suitable for engineering application provides the foundation for design of composite antenna reflector.At the same time,the numerical simulation solved the problem which is unable to obtain the influence of thermal deformation on the performance of antenna by universal CAE software.