A Fast Calculation Method for the Deformed Position and Attitude of the Secondary Surface Based on the Strain of Antenna Legs

Abstract

The invention discloses a quick calculation method for an auxiliary surface deformation position posture based on the strain of an antenna supporting leg. The method comprises the steps that structural parameters, working frequencies and material attributes of a main surface, an auxiliary surface, the supporting leg and a back rack of a double-reflection-surface antenna and the distribution positions and number of strain sensors are determined; measurement values of the strain sensors on the antenna supporting leg are extracted, and a finite element model is established; nodes of a junction ofthe antenna supporting leg and the auxiliary surface and corresponding modal vibration mode matrixes are determined; nodes at the strain sensors on the antenna supporting leg and corresponding strainmodal vibration mode matrixes are determined; generalized modal coordinates of the antenna auxiliary surface are calculated; displacement of a connection point of the antenna supporting leg and the auxiliary surface is calculated; the position of the deformed connection point of the antenna supporting leg and the auxiliary surface is calculated; the translation amount of a vertex of the auxiliarysurface before and after deformation and a coordinate conversion matrix before and after deformation of the connection point are calculated, and the position posture after deformation of the auxiliary surface is obtained. According to the quick calculation method, displacement of the connection point of the antenna supporting leg and the auxiliary surface can be quickly and effectively calculated, and the method helps to meet the index requirement of electric performance of the double-reflection-surface antenna.

Description

technical field [0001] The invention belongs to the technical field of antennas, and in particular relates to a method for quickly calculating the deformation position and attitude of a secondary surface based on the strain of antenna support legs. Background technique [0002] As large antennas are widely used in astronomical observation, satellite tracking and communication, etc., the diameter and frequency band of dual-reflector antennas are also increasing, which brings many challenges to the structural design of the antenna and affects the electrical performance of the antenna. The requirements are also getting higher and higher. [0003] Due to the long-term exposure of the double-reflector antenna to the natural environment, its legs are easily affected by its own weight and environmental factors such as wind, rain, snow, and sunlight. These will cause strain on the antenna legs, resulting in changes in the position and attitude of the secondary reflector. Changes, t...

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Problems solved by technology

[0006] In order to solve the above-mentioned defects existing in the prior art, the object of the present invention is to provide a method for quickly calculating the deformation position and posture of the secondary surface based on the strain of the antenna support leg. In this way, the displacement of the connection point between the antenna support leg and the secondary surface can be quickly and effectively calculated, and then the position and attitude of the secondary surface after deformation can be obtained, which is conducive to the dual-reflector antenna meeting the electrical performance index requirements and making the antenna work performance optimal.

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