A Design Method of Structured Notch Filter

Abstract

The invention relates to a structure notch filter designing method which is used for structure notch filters for large flight envelope range flight or multi-task flight airplanes or changing along with the flight state. Design is conducted under the condition that the requirement for the sufficient pneumatic servo elastic stability margin of an airplane is guaranteed, the method includes the steps that an airplane envelope is divided, pneumatic elasticity analysis without the structure notch filter is conducted on the airplane envelope, frequency points and damping coefficients which are preliminarily obtained are adjusted according to an adjustment principle, and finally a transmission function of the structure notch filter is obtained. By the adoption of the structure notch filter designing method, the adaptability of structure notch filter design is improved, the pneumatic servo elastic stability margin is improved, the requirement for adjusting flight control law technical parameters is lowered, and the flight performance is improved.

Description

technical field [0001] The invention belongs to the field of aeroelasticity, and in particular relates to a design method of a structural notch filter. Background technique [0002] The aeroservoelastic stability problem is a stability problem caused by the coupling of aircraft aeroelasticity and flight control. It is directly related to the flight safety of the aircraft. It must be fully calculated, analyzed and tested in the aircraft design stage to eliminate potential instability. If the problem of aeroservoelastic instability exists, it is a general engineering method to design a structural notch filter additionally to the flight control law. [0003] The previous structural notch filter design is usually to set a certain structural notch filter for each loop, which does not change with the change of flight speed, flight altitude or aircraft loading task, therefore, often requires multiple rounds It takes several design iterations to design this kind of structural notch...

AI Technical Summary

Problems solved by technology

[0003] The previous structural notch filter design is usually to set a certain structural notch filter for each loop, which does not change with the change of flight speed, flight altitude or aircraft loading task, so it often takes multiple rounds It takes several design iterations to design this kind of structural notch filter that meets the requirements of aeroservoelastic stability and flight control requirements, and sometimes even fails to design satisfactory results.

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