放宽静稳定度飞机时间延迟稳定边界

doi:10.7527/S1000-6893.2019.23487

Abstract

Abstract: The problem of quantitative determination between Relaxed Static Stability (RSS) and time delay boundary of the fly-by-wire control system during the preliminary design stage of aircraft is studied. Based on the longitudinal short-period equation of the combat aircraft, the time delay factor in the flight control system and the relationship between parameters in short period equation and RSS is analyzed. A characteristic equation of closed-loop system with time delay of flight control system is constructed in the form of equivalent input delay. The quantitative numerical relationship between the RSS and the time delay boundary of the flight control system is determined by the root tendency theory and the numerical calculation method. Moreover, the influence of the parameter uncertainty of control surface efficiency and dynamic derivative on the time delay boundary is also discussed. The method of this paper has certain engineering practical significance for determining the time delay boundary of the flight control system and the RSS of the aircraft in the preliminary stage of aircraft design.

Key words: time delay stability, short period mode, relaxed static stability, controllability evaluation, preliminary design

CLC Number:

V212.1

CHEN Xiaoming, SUN Shaoshan, TAO Chenggang, TANG Yong. Time delay stability boundary on relaxed static stability aircraft[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(6): 523487-523487.

References 21

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Time delay stability boundary on relaxed static stability aircraft

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