Ellipsoidal model-based expandable antenna unfolding arm tolerance design method

A technology of ellipsoid model and design method, which is applied in the directions of folding antenna, rotating antenna, design optimization/simulation, etc., and can solve problems such as cost increase, processing difficulty, and no solution given

Active Publication Date: 2018-03-30
XIDIAN UNIV
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Problems solved by technology

Because too large tolerance will lead to dissatisfaction of the design index, while too small tolerance will lead to increased cost of manufacturing and assembly and dif

Method used

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  • Ellipsoidal model-based expandable antenna unfolding arm tolerance design method
  • Ellipsoidal model-based expandable antenna unfolding arm tolerance design method
  • Ellipsoidal model-based expandable antenna unfolding arm tolerance design method

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Embodiment Construction

[0074] Such as figure 1 As shown, the tolerance design method of deployable antenna deployment arm based on the ellipsoid model is characterized by at least including the following steps:

[0075] 1. Obtain the tolerance-cost relationship Cost=C(Δ) for the type of deployment arm involved, where Δ=|ΔX max | is the tolerance of various angle errors; Cost is the cost; C is the relationship function.

[0076] 2. Establish a coordinate transformation matrix T from the root of the extended arm to the end that does not contain errors, and obtain the transformation matrix when the expansion angle error of each joint is obtained The vector P of the ideal pointing vector of the reflector in the satellite coordinate system, and the vector of the pointing vector in the satellite coordinate system when considering the error difference between two vectors That is, the roll, pitch and yaw angle deviation of the reflector in the satellite coordinate system after the antenna support arm ...

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Abstract

The invention relates to a related ellipsoidal model-based expandable antenna unfolding arm joint tolerance design method. According to the method, a coordinate conversion matrix from a reflector on the end part of an unfolding arm to a satellite coordinate system is established firstly; and meanwhile, a tolerance-cost relation is obtained through research analysis. Specific to the overall structural form of the unfolding arm, various errors in the multi-stage unfolding arms are classified based on correlation; meanwhile, specific to each type of errors with internal correlation, an ellipsoidal mathematical model which represents the correlation is obtained through tests; next, Monte Carlo random sampling is performed in the ellipsoidal sphere, and a final angle error of the reflector is obtained based on the coordinate conversion matrix; and finally, by taking the total cost minimization as the object, by taking tolerance as a design variable, and by taking pointed error for satisfying design requirement as the constraint, tolerance optimization design is performed. A simulation structure shows that effective unfolding arm joint tolerance design can be realized by the method, andmeanwhile, design difficulty of the conventional method caused by no consideration of the correlation is avoided.

Description

technical field [0001] The invention belongs to the technical field of joint tolerance design of deployable antennas, and in particular relates to a tolerance design method of a deployable antenna deployable arm based on an ellipsoid model, which is used to guide the selection of joints of the deployable antenna deployable arm. Background technique [0002] In recent years, space deployable antennas have been widely used in resource detection, meteorological monitoring, space communication and other fields. The deployable antenna is in a retracted state during launch and is fixed in the rocket fairing. After reaching the predetermined orbit, it will automatically deploy to the working state under the command of ground control. And this unfolding process mainly refers to the unfolding of the unfolding mechanism. Considering that there are deployment angle errors in the deployment mechanisms at all levels, there is a certain deviation between the position of the deployed conn...

Claims

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Application Information

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IPC IPC(8): H01Q1/08G06F17/50
CPCG06F30/20H01Q1/08H01Q1/084
Inventor 胡乃岗张逸群杨癸庚宗亚雳张顺吉
Owner XIDIAN UNIV
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