Shell Parabolic Ends Loaded Molding Method And Precision Analysis

Spaceborne parabolic antenna is a satellite antenna of various types, owing to its strong directional high gain, easy beam automatic scanning and other features, onboard parabolic antenna has become a new direction of development of spaceborne antenna. In recent years at home and abroad for spaceborne cylindrical antenna made some preliminary studies, we have made a number of molding methods onboard parabolic antenna reflector surface. But the presence of a preformed complex structure and the regulatory agencies, will bring some folding deployment mechanism, structural reliability issues.To solve the above problem, this paper established a new parabolic shell molding process by forcing both ends of bent sheet isotropic parabolic shell. Firstly, we established a big deflection shell parabolic small deformation of the beam deflection line equations, Runge- Kutta method for solving the optimal precision obtained shell parabolic boundary bending force value to obtain its borders in this optimal precision force is under 0.33 mm, parabolic feasibility shell molding method to obtain a preliminary verification. While using Abaqus finite element software parabolic cylinder shell finite element modeling, the establishment of a parabolic shell simulation method to analyze parabolic shell by deformation, to obtain surface accuracy of parabolic shell It is 0.63 mm. Then, based on Abaqus FEA software, to carry out shell parabolic properties of vibration characteristics obtained shell forming a parabolic base bending state frequency of 0.70 Hz, and the cloud can be seen by the displacement in the direction of vibration deflection larger deformation.In this paper, then adjust the cylindrical shell-shaped face stiffness increased antenna surface accuracy of the method was found in shell parabolic continuity with variable thickness, and the thickness ratio of 1.40 in the case of a parabolic cylindrical shell surface accuracy to have about 60% of the increase amount. Then analyzes the influence of thermal deformation on the surface accuracy of parabolic cylinder shell at a temperature field.Finally, according to the principle shell parabolic shaped design principles to validate the model, describes the various components of the principle shell parabolic validate the model, a detailed description of the structure and main functions. And the use of digital laser measuring systems for three-dimensional coordinate system verification cylinder random points on the model and export value by matlab curve fitting toolbox software to validate the model fitting cylindrical shell, has been the principle shell parabolic model validation surface accuracy.