The potential impact of adverse aircraft-pilot couplings on the safety of tilt-rotor operations
The potential impact of adverse aircraft-pilot couplings on the safety of tilt-rotor operations
复制标题
不利的飞机-飞行员耦合对倾转旋翼操作安全的潜在影响
DOI:
10.1017/aer.2022.20
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Padfield G
中科院分区:
文献类型:
--
作者:
Padfield G
This paper addresses the potential impact of adverse aircraft-pilot couplings on tiltrotor safety, when a pilot or autopilot attempts to constrain flight dynamics with strong control. The work builds on previously published research on the theory and application of constrained flight to fixed- and rotary-wing aircraft. Tiltrotor aircraft feature characteristics from both types of aircraft and how these determine behaviour in a unique manner is investigated using a FLIGHTLAB simulation model of the XV-15 aircraft. Two different scenarios are explored in detail, using linearised models that reflect the flight-physics of stability for small deviations from trim. First, the control of vertical flight path with longitudinal cyclic pitch and elevator, and the consequences for the stability of the aircraft surge mode and short-period pitch-heave mode. The classical surge-mode instability for flight at speeds below minimum power is shown to apply to the tiltrotor in helicopter mode but alleviated in conversion and airplane modes. The impact on the short–period mode is seen to be a trade-off between the stabilising pitch attitude and destabilising incidence (angle-of-attack) contributions to the flight-path angle. The second example concerns strong control of roll attitude in the presence of adverse aileron-yaw. Here, the yaw-sway motion can be driven unstable, a problem encountered on fixed-wing aircraft with weak weathercock stability, but rare in the rotorcraft world. For both examples, the loss of stability is expressed as the change in sign of effective damping or stiffness stability derivatives. The explanatory theory for these non-oscillatory or low-frequency aircraft-pilot couplings is presented, along with interpretations in terms of handling qualities criteria. The paper also addresses the question of how to translate the findings into a form of aeronautical knowledge useful for the pilot training community.
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影响因子:
1.4
作者:
L. Lu;G. Padfield;M. Jump
通讯作者:
M. Jump
DOI:
10.1017/aer.2018.12
发表时间:
2018
期刊:
The Aeronautical Journal
影响因子:
--
作者:
R. W. D. Val;Chengjian He
通讯作者:
Chengjian He
DOI:
10.1017/aer.2019.103
发表时间:
2019
期刊:
The Aeronautical Journal
影响因子:
--
作者:
N. Isaacs
通讯作者:
N. Isaacs
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
M. Pavel;P. Masarati;M. Gennaretti;M. Jump;L. Zaichik;Binh Dang;Linghai Lu;D. Yılmaz;G. Quaranta;Achim Ionita;J. Serafini
通讯作者:
J. Serafini
DOI:
--
发表时间:
1965
期刊:
影响因子:
--
作者:
R. D. Milne
通讯作者:
R. D. Milne