Spatial mesh antenna electrical property dynamic response analysis method based on second-order approximate calculation formula

Abstract

The invention discloses a spatial mesh antenna electrical property dynamic response analysis method based on a second-order approximate calculation formula. The method includes the steps that antenna geometric parameters, material parameters and electrical parameters are input; an ideal antenna far zone electric field is calculated; an antenna structure finite element model is established; node, unit and shape function information is extracted; unit electrical property first-order and second-order coefficient matrixes are calculated; total electrical property first-order and second-order coefficient matrixes are assembled; antenna structure mode analysis is carried out; a mode matrix is output; an electrical property dynamic response first-order derivative column vector and a second-order Hessian array are calculated; dynamic loads are applied; mode coordinates are calculated; the change amount of the antenna far zone electric field is subjected to approximate calculation; dynamic response of the far zone electric field is calculated; whether electrical properties meet requirements or not is judged; if yes, an antenna structural design scheme is output; or else antenna parameters are updated. The electrical property dynamic response calculation time can be effectively shortened on the premise of guaranteeing calculation precision, and electromechanical integrated optimization design of an antenna structure is achieved.

Description

technical field [0001] The invention belongs to the technical field of radar antennas, and in particular relates to a method for analyzing the dynamic response of electrical properties of spatial mesh antennas based on second-order approximate calculation formulas in the field of radar antennas. Background technique [0002] Mesh antennas are gradually used in space antenna design due to their advantages of light weight and small folded volume. During the operation of the mesh antenna in orbit, it is periodically affected by dynamic loads such as space radiation heat and impact. The deformation of the antenna surface caused by the dynamic load has a great impact on the electrical performance of the antenna. The deformation of the antenna surface caused by the dynamic load will cause the vibration of the antenna structure, the decrease of the electrical performance gain, the increase of the side lobe level, and the tilt of the beam, which will seriously affect the working per...

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Problems solved by technology

This method takes the array antenna as the object, and analyzes the influence of random vibration on the electrical performance of the array antenna. Although this analysis method can provide reference for the space mesh antenna, due to the nonlinear characteristics of the antenna electrical performance calculation, it is not suitable for the dynamic load. Antenna electrical

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