Fighter agility metrics, research and test

Liefer, Randall K.; Valasek, John; Eggold, David P.; Downing, David R.

doi:10.2514/3.46182

Cited by 22 publications

(13 citation statements)

References 6 publications

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“…2 Post-stall maneuvering in the low-speed, high angle-ofattack portion of the flight envelope, popularly referred to as agility, is motivated by this weapon technology [2]. Lan indicates in [3] that the agility of fighter type aircraft at high angles-of-attack can be seriously degraded because of the following factors :…”

Section: Aiaa-99-4216mentioning

confidence: 99%

Model predictive variable structure control with model following for forebody vortex flow control

Ito

Valasek

1999

Guidance, Navigation, and Control Conference and Exhibit

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Aircraft which are required to fly effectively at high angles-of-attack must overcome two fundamental difficulties: generally poor dynamic characteristics, especially with respect to damping, and low control authority of conventional aerodynamic effectors. One solution to improve closed-loop tracking of pilot commands is to employ a model-following controller approach, whereby an aircraft with poor dynamics at high angle-ofattack is made to track the outputs of a model of the same aircraft at low angle-of-attack, thereby emulating its good dynamics. An improved solution is the extension to combine the model-following controller with a controller that can augment the yaw control power by effectively modulating forebody pneumatic vortex flow nozzles. This paper presents the synthesis and design of both high angleof-attack lateral/directional controllers for a generic X-29A equipped with forebody vortex flow control nozzles. Results demonstrate that both controllers are effective in improving closed-loop tracking of input commands and high angle-of-attack maneuverability, compared to a conventional flight control scheme using only aerodynamic control effectors, and without model-following.

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Section: Aiaa-99-4216mentioning

confidence: 99%

Model predictive variable structure control with model following for forebody vortex flow control

Ito

Valasek

1999

Guidance, Navigation, and Control Conference and Exhibit

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“…All are retained here ("Selected maneuverability and agility metrics" section). Liefer et al 12 and Paranjape and Ananthkrishnan 13 investigated suitable agility metrics for fixed-wing fighters and found among others: time to catch a certain angle (stabilized); peak pitch/roll rates (=CP); and time to reach a certain angle (unstabilized), T xx . The latter two are retained here ("Selected maneuverability and agility metrics" section).…”

Section: Related Workmentioning

confidence: 99%

“…Usually a change in attitude angle of 90 is performed, but this can be less (45 ), whatever is feasible. 12,13 This metric is not in ADS-33E, so no reference value is available.…”

Section: à ámentioning

confidence: 99%

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Experimental maneuverability and agility quantification for rotary unmanned aerial vehicle

Verbeke

Schutter

2017

International Journal of Micro Air Vehicles

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Multicopters are the most popular rotary type of unmanned aerial vehicles. They are a type of helicopter with three or more, usually fixed-pitch, propellers that lift and control the platform by individually changing their rotational velocities. The main advantages of a multicopter are its compactness, robustness, and low cost to build and repair. However, currently no published research determines objectively, quantitatively, and experimentally, the maneuverability and agility of multicopters. Numerous maneuverability and agility metrics, together with detailed test procedures and minimum requirements, exist for manned aircraft. Nevertheless, some of these are not directly applicable to small-size unmanned aircraft. A new test procedure, derived from manned aircraft industry practices and research, based on a simple openloop step input maneuver, was developed. It experimentally determines nine maneuverability and agility metrics using only onboard flight controller logs. The test procedure is validated using two different multicopters.

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“…Agility metrics differ from traditional steady-state measures such as maximum speed, maximum load factor, and maximum sustained turn rate, in that they are intended to describe the transient capability of the aircraft, or how the aircraft transitions from one steady-state ight condition to another. 2 This consideration is an important one because technology improvements in propulsion, thrust vectoring, and all-aspect missiles have decreased the time of engagements and increased the transient aspect of maneuvering.…”

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confidence: 99%