Differential extraction, construction and synchronization method of flight control stability augmentation controlled variable

Abstract

The invention relates to a construction method of a longitudinal comprehensive controlled variable C*. The longitudinal comprehensive controlled variable is constructed through a normal overload NZ, an attack angle AOA, a pitch rate QSNSN and corresponding filtering and gain links. In the construction process, the same parameters are selected for the normal overload high-frequency component filtering link and the pitch rate filtering link to achieve synchronization of the normal overload high-frequency component filtering link and the pitch rate filtering link. C* differential signals are extracted and obtained through an attack angle differential signal AOADOT_CF, a normal overload high-frequency component differential signal NZPHFDOT, a pitch rate differential signal QFDOT and corresponding gain links. The filtering of the comprehensive controlled variable C*, the normal overload and the pitch rate, which is constructed by the method, realizes synchronization, conforms to the principle of bandwidth control, and has a better control response effect; and the differential signal of the comprehensive controlled variable C* with synchronism of the normal overload differential signal and the pitch rate differential signal extracted by the patent can correctly reflect the differential condition of the constructed C* signal, and the response performance of a control loop can be improved when the differential signal is applied to a control scheme.

Description

technical field [0001] This patent belongs to the technical field of flight control stability enhancement control design, and relates to the selection and construction of controlled variables for stability enhancement control loops. Background technique [0002] In the design of the flight control system, the selection scheme of the controlled variable of the stability augmentation control loop plays a key role in the response characteristics and stability of the stability augmentation control loop. For the selection of stability augmentation control variables for manned aircraft, the scheme also needs to take into account the pilot's driving habits and the corresponding standards of the national military standard. Therefore, the comprehensive controlled variable is usually constructed as the controlled variable scheme of the manned aircraft. The differential signal of the controlled variable can be used in the control loop to improve the response characteristics of the con...

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