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Stable adaptive fuzzy active vibration control method for closely spaced structure

An active vibration control and self-adaptive fuzzy technology, applied in adaptive control, general control system, control/regulation system, etc., can solve the problems of large actuators, expensive, difficult to achieve vibration suppression, etc.

Active Publication Date: 2017-05-10
BEIJING INST OF CONTROL ENG
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Problems solved by technology

Due to the lack of effective low-order active vibration control methods for dense-frequency structures, a large number of actuators are required, making the control system complex and expensive, and it is even difficult to achieve stable vibration suppression for such structures

Method used

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  • Stable adaptive fuzzy active vibration control method for closely spaced structure
  • Stable adaptive fuzzy active vibration control method for closely spaced structure
  • Stable adaptive fuzzy active vibration control method for closely spaced structure

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Embodiment Construction

[0062] The concrete implementation process of the inventive method is as figure 1 shown.

[0063] Here, it is assumed that the overall degree of freedom of the finite element model of the space flexible structure is n, and its natural frequency is densely distributed in the low frequency band, which is a space dense frequency structure. The present invention applies stable self-adaptive fuzzy active vibration control to the dense frequency structure, and the main steps are as follows:

[0064] (1) Transform the n-order physical space model of the structure into the independent mode space through coordinate transformation as follows:

[0065] The n-order physical space model of the structure can be expressed as

[0066]

[0067]

[0068] where M∈R n×n is the mass matrix, C∈R n×n is the Rayleigh damping matrix, K∈R n×n is the stiffness matrix, q(t)∈R n×1 is the physical space displacement vector, referred to as physical displacement; For the control input matrix, ...

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Abstract

The invention discloses a stable adaptive fuzzy active vibration control method for a closely spaced structure, and the method comprises the steps: designing an adaptive fuzzy controller for a master mode of each stage based on an independent mode space; finally converting a solved mode control quantity into an actual control quantity. A fuzzy rule is based on analysis expression, thereby achieving the nonlinear mapping from the input of vibration information and the output of the control quantity. The method is simple and visual in calculation, introduces a projection algorithm for designing a parameter vector adaptive rule for the analysis of the fuzzy rule, and improves the uncertainty of a closely spaced structure model and the robustness of an overflow problem. Compared with a conventional control method, the method can effectively improve the vibration inhibition effect. Meanwhile, the method carries out the constraint of the boundary of a parameter vector, and prevents the excessive modification of the fuzzy rule from causing the instability. In addition, the adaptive rule of the parameter vector optimizes the nonlinear organization capability of the control quantity, reduces the demands for the control energy, well processes the conflict between the low controllability of the closely spaced structure and the limited actuation capability in active vibration control, and has an engineering practical value.

Description

technical field [0001] The invention relates to a stable self-adaptive fuzzy active vibration control method for space-intensive frequency structures, which is suitable for complex satellites such as electronic reconnaissance and microwave remote sensing with ultra-large mechanical aperture antennas, and can improve platform attitude performance indicators and large antenna pointing accuracy. And it plays an important role in space tasks such as multi-antenna pointing and flexible large load movement. Background technique [0002] In order to achieve higher resolution and antenna gain, complex spacecraft often have oversized antennas. This is a huge load on the launch platform, which can only be achieved by reducing the mass density of the antenna and adopting the means of launch retraction and on-orbit deployment. This kind of material is ultra-light and ultra-thin, and the structure is a flexible structure formed by the periodic extension and splicing of the basic frame. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 刘潇翔何英姿魏春岭汤亮张军林波范炜陈守磊石恒苏晏
Owner BEIJING INST OF CONTROL ENG
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