Root Locus Equivalent Determination Method for Stability Margin of Multiple-Input-Multiple-Output Vehicle

Abstract

The invention relates to a multi-input-multi-output aircraft stability margin root locus equivalent determination method, which is used to solve the technical problem that the existing aircraft stability margin root locus determination method cannot determine different combinations. This method establishes the open-loop transfer function matrix of the multi-loop system, and connects a diagonal matrix with gain and lag phase angle to the open-loop transfer function matrix of the system, and obtains the stability margin analysis using the closed-loop transfer function matrix, thus obtaining The root locus scalar equation of the equivalent multi-loop stability margin analysis; the selection of different values ​​of the diagonal matrix artificially connected in series can analyze the phase margin and amplitude of the overall loop, a certain loop, and various combinations margin.

Description

Root Locus Equivalent Determination Method for Stability Margin of Multiple-Input-Multiple-Output Vehicle technical field The present invention relates to a kind of aircraft stability margin root locus determining method, particularly relate to multi-input-multi-output flight Equivalent determination method of root locus of device stability margin. Background technique [0002] The stability margin is an important performance index to evaluate a flight control system, indicating the reliability of the system stability. The stability margin of the system includes two aspects: gain stability margin and phase stability margin. Study on Stability Margin of SISO System It is more mature and can be easily obtained from the classic Bode or Nyquist diagrams. For the stability margin of the aircraft, a series of Sweep frequency flight test of the column, and then determine whether the stability margin index is satisfied or not. Many airplanes now have canards, vertical and h...

AI Technical Summary

Problems solved by technology

In order to overcome that existing aircraft stability margin root locus deter