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Design method for nonlinear system controller of aero-engine

A technology of aero-engine and nonlinear system, applied in the field of controller design of aero-engine nonlinear system

Inactive Publication Date: 2015-11-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to accurately linearize the nonlinear system of the aero-engine based on the exact linearization theory, and to design the nonlinear control of the aero-engine by using the sliding mode variable structure control strategy in consideration of the strong nonlinearity and uncertainty of the aero-engine Design a reasonable target performance function for the designed controller, and use the artificial bee colony algorithm to optimize the controller parameters to obtain the optimal control effect

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Embodiment Construction

[0103] The design method of the nonlinear system controller of the aero-engine of the present invention comprises the following steps:

[0104] Step 1), establish the nonlinear state variable model of the aeroengine, which can be expressed by the following formula:

[0105]

[0106] Among them, the system equation is linear to the input u, x is an n-dimensional state vector, f(x) is a smooth n-dimensional vector function, f=[f 1 ,..., f n ] T , B(x) is n×m order function matrix, B=[b 1 ,...,b m ], u is the m-dimensional control vector, d(t)=Dg(t) is the n-dimensional interference vector d(t) is the external interference, and satisfies the interference matching condition:

[0107] rank(B,d)=rank(B)(2)

[0108] Step 2), accurately linearize the nonlinear model in step 1) based on the exact linearization theory;

[0109] Step 3), designing a sliding mode variable structure controller for the linearized model in step 2), forcing the new state variable to move according to...

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Abstract

The invention discloses a design method for a nonlinear system controller of an aero-engine. The method is directed at control problems of the affine nonlinear system of the aero-engine within a large deviation range. The method comprises the following steps: linearizing the nonlinear system of the aero-engine based on the theory of exact linearization, adopting the variable structure control in designing a non-linear sliding mode controller, changing a control structure with a purpose by using a linearized state variable to enable the linearized state variable to move based on the designed sliding mode track so as to offset parameter perturbation and exterior interference, finally directed at the key problem of designing non-linear controller parameters, adopting the artificial bee colony algorithm in adjusting the controller parameters, and calculating the optimal parameter to optimize the control effect. According to the invention, the method is directed at the problem of designing complex controller parameters, and obviates the need for tedious manual debugging and repeated verification. By using the bee colony algorithm in designing a reasonable target performance function, the method enables an automatic calculation of the optimal controller parameters and enables the non-linear controlling system of the aero-engine to have a satisfied dynamic performance and robust stability.

Description

Technical field: [0001] The invention relates to a design method for a nonlinear system controller of an aero-engine, adopts a novel intelligent algorithm, and has good adaptability and optimization effect for difficult-to-adjust controller parameters. Background technique: [0002] Aeroengine is a nonlinear controlled object with complex thermodynamic process, and the working environment is harsh. There are nonlinear factors such as unknown disturbance and parameter perturbation in the actual system, and its working process needs to be controlled, and the designed controller needs good dynamic performance and robustness. Due to the complexity of aeroengine thermal engineering and many nonlinear factors, conventional linear control methods cannot meet the performance requirements within a large deviation range, so it is of great significance to study the nonlinear control of aeroengines. [0003] Variable structure control (viriable structure control, VSC) is also called sl...

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Application Information

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IPC IPC(8): G05B13/04
Inventor 卢彬彬肖玲斐范昕宇杜彦斌胡继祥
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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