Dynamic load analysis method of space mesh antenna based on electromechanical coupling model

Abstract

The invention discloses an electromechanical coupling model-based space net-shaped antenna power load analysis method. The method specifically comprises the steps of (1) inputting antenna geometrical parameter, material parameters and electrical parameters; (2) establishing an antenna structure finite element model; (3) performing antenna structure modal analysis; (4) outputting a modal matrix; (5) applying power load; (6) calculating modal coordinates; (7) calculating reflective surface node displacement; (8) calculating surface patch phase error; (9) calculating an antenna far-zone electric field by adopting an electromechanical coupling model; (10) determining whether electrical performance satisfies requirement or not; and (11) outputting an antenna structure design scheme, or (12) updating the antenna parameters and continuing to perform the step (1). By virtue of the electromechanical coupling model-based space net-shaped antenna power load analysis, the space net-shaped antenna electrical performance analysis and electromechanical integration optimization design can be guided under the effect of vibration load.

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 load of a space mesh antenna based on an electromechanical coupling model 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 performance of the antenna. Different from...

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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 characteristics of the space mesh antenna, such as large span, light weight, and weak structural damping , so that the antenna system has unique structural dynamic characteristics such as low vibration frequency, dense modes, and structural nonlinearity. This method is difficult to predict the electrical performance changes of the spatial mesh antenna under dynamic loads.

Zhou Jinzhu, Song Liwei, etc. analyzed the influence of dynamic load on the structural-functional integration The influence of the electromechanical performance of the antenna, the analysis method is also difficult to deal with the unique structural dynamic characteristics of the space mesh antenna

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