Method for predicting influence of vibration deformation on electric performance of array antenna

Abstract

The invention discloses a method for predicting influence of vibration deformation on electric performance of an array antenna. The method comprises the following steps of: 1) determining a geometric model file of the array antenna; 2) establishing a finite element model of the array antenna in ANSYS; 3) presetting an acceleration power spectrum, calculating random vibration deformation, and extracting position offset of each radiation unit; 4) calculating a pattern function of the array antenna; and 5) judging whether the pattern function satisfies design requirements. According to the conventional method, whether the structure strength of the antenna satisfies the requirement is analyzed according to the acceleration power spectrum, and the electrical performance cannot be determined according to array plane deformation errors. The method provided by the invention can realize the prediction on the electrical performance of the antenna according to the offset caused by random vibration; the method provided by the invention is more succinct, can introduce the offset into an electromechanical coupling model to calculate the electrical performance, and does not need to repeat electromagnetic modeling according to the change of the offset; and the method provided by the invention is used for analyzing the influence of vibration on the antenna and finding main structural factors, thereby ensuring that the antenna is protected from being damaged, and the electrical performance of the antenna in a working state is improved.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a method for predicting the influence of vibration deformation on the electrical performance of an array antenna. Background technique [0002] Array antenna technology is the latest technology being developed in recent years. The array antenna is an antenna that changes the shape of the pattern by controlling the feeding phase of the radiating elements in the array antenna. Controlling the phase can change the direction of the maximum value of the antenna pattern to achieve the purpose of beam scanning. In special cases, it is also possible to control the sidelobe level, the minimum position and the shape of the overall pattern. When the antenna is rotated mechanically, the inertia is large and the speed is slow. The array antenna overcomes this shortcoming, and the scanning speed of the beam is high. As the most advanced active phased array antenna in the array antenna, it ...

AI Technical Summary

Problems solved by technology

In the existing research, the mechanical aspects mainly focus on the research on the influence of random vibration on the mechanical properties of the antenna structure. When calculating the influence of random errors on the electrical performance of the antenna, most scholars believe that the random errors of the antenna obey a certain probability distribution, which cannot The real response antenna structure is affected by random vibration errors

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