Control-orientated large antenna modeling method

A modeling method and antenna technology, applied in adaptive control, general control system, control/adjustment system, etc., can solve the problems of not considering the antenna structure pointing deviation, large workload, and reducing the accuracy of error compensation.

Active Publication Date: 2014-06-04
XIDIAN UNIV
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Problems solved by technology

[0008] However, the existing methods for improving pointing accuracy either take the rigid angle at the rotating shaft as the pointing point and analyze the influence of external loads on it, without considering the pointing deviation caused by the flexible vibration of the antenna structure itself, which reduces the accuracy of error compensation; or use Optical instruments create tables for the pointing error data under different working conditions. Although this method is equivalent to considering the flexible vibration of the antenna, it has a large workload and low efficiency, and the compensation given is only the average value, which reduces to a certain extent Pointing error, but limited effect

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Embodiment Construction

[0067] The used model of the present invention has: 1) the antenna finite element model that establishs in the finite element analysis software (ANSYS).

[0068] Modeling principle:

[0069] (1) Principle of preliminary parameter extraction:

[0070] First, according to the existing finite element modeling method, the finite element model is established based on the position of the reflecting surface under the structural working condition, and a certain frequency F is used as the constraint condition. In general, attention is paid to the low frequency characteristics of the structure, so F is taken as 100Hz, and the application The finite element software analyzes the mode shapes of each order within F, assuming that there are n orders in total, and each order is coded as S1, S2...Sn, and n is selected d degrees of freedom, n d The value is generally greater than 2 times the order. According to the vibration theory, extract the mode shapes of each order to form the mode matr...

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Abstract

The invention relates to a control-orientated large antenna modeling method which comprises the steps of ansvs modal analysis, relevant vibration mode selection, modal parameter calculation, input and output matrix conversion, decomposition of each order of modality, calculation of the norm of each order of modality, modal polycondensation and modal superposition. The method has the advantages that due to the fact that antenna flexibility information is established in a control model, the model is closer to the reality and pointing error calculation is more accurate; due to the fact that a rigid model and a flexible model are both in a decoupled state, rigid corners and flexible deviation can be output by the rigid model and the flexible model respectively, and output processing can be conducted respectively.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a control-oriented large-scale antenna modeling method, which is used to introduce the flexible mode of the antenna into the model of the servo tracking system and improve the analysis accuracy. Background technique [0002] Large-scale reflector antennas are widely used in satellite communications, deep space exploration and other fields due to their advantages of high irradiation efficiency and low edge leakage. However, the design indicators of large-scale reflector antenna pointing controllers are relatively high. For a 65-meter aperture antenna, the pointing accuracy requires an error of less than 0.01°. Only when the accuracy meets the requirements can the efficiency of the antenna aperture be exerted. As the aperture continues to increase, the antenna structure will be affected by various loads such as self-weight, wind load, rain and snow. , causing flexible deformation ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 张洁黄进宋瑞雪邱丽丽
Owner XIDIAN UNIV
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