Surface Precision Analysis Of Inflatable Antenna

Performance of inflatable antenna reflector hinges critically on the precision of the membrane surface. If the error is not in the range of limit, it will heavily decrease antenna gain and increase sidelobe level. As a result, it is significant for suited design between structure and eletricity performance to research the surface accuracy of inflatable deployable antenna.The geometriclly nonlinear analysis of membrane structure is conducted by finite element software. Principle between surface precision and pressure, cutting scheme is achieved by ANSYS and digital photogrammetry system(DPS).When the membrane deforms parabolid, the geometry and equilibrium equation are educed in the condition of large displacement, large rotation and small strain. That is to say, the expression of strain should include quadratic term of displacement and equilibrium equation should be established after the structure had deformed.This aberration is referred to as a"M"by finite element method. RMS of absolute error(RMSa) is obtained according to displacement, moreover, the relationship graph between RMSa and pressure offers gist for controlling surface precission.The expression between RMS of slop error(RMSs) and absolute error is educed according to boundary condition and the presumption that the curved surface is quadratic when the structure deforms and the aberration is symmetric. When RMSa keeps constant, RMSs will decrease along with the increasing radial.According to Ruze expression, we analyze the effect of structure on electricity performance. The antenna gain will reduce when RMSa enhances. For a given wavelength and gain ,the limit of RMSa can be determined. Designing curve is obtained by iteration, and the least time is achieved based on the requirement of error.We have founded DPS, what is more, we acquired principle of the effect of the cutting scheme and pressure on surface precision by using the DPS. The number of gores for higher accuracy is achieved and it means that precision in manufacturing and number of gore are vital to produce highly accurate...