Flying quality analysis and flight evaluation of a highly augmented combat rotorcraft

Tischler, Mark B.; Fletcher, Jay W.; Morris, Patrick M.; Tucker, George E.

doi:10.2514/3.20736

Cited by 29 publications

(18 citation statements)

References 4 publications

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“…This has been a common theme in the development of advanced control systems for rotorcraft. 18,19 Direct control system optimization in CONDUIT using a validated mathematical model and relevant design requirements assured that flight evaluation could proceed with a minimum of costly flight-test tuning as compared to historical experience, for example, Ref. 4.…”

Section: Optimized Baselinementioning

confidence: 99%

Modernized Control Laws for UH-60 BLACK HAWK Optimization and Flight-Test Results

Tischler¹,

Blanken²,

Cheung³

et al. 2005

Journal of Guidance, Control, and Dynamics

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Modernized control laws were developed to provide an attitude-command/attitude-hold response type for the UH-60 BLACK HAWK helicopter and thereby afford improved handling qualities for near-Earth operation in night and poor weather. The inner-loop system modernized control laws were implemented using the 10% authority stability augmentation system actuators and was evaluated in an EH-60L helicopter. Central to addressing the significant resource and technical challenges of this project was the extensive use of a modern integrated tool set. System identification methods provided an accurate flight-identified aircraft response model and allowed the efficient isolation of discrepancies in the block diagram-based simulation model. Additional key tools were real-time rapid prototyping and a well-designed picture-to-code process. Control laws were tuned to achieve the maximum design margin relative to handling qualities and control system performance requirements. The optimized design was seen to be robust to uncertainties in the identified physical parameters. A flight-test evaluation by three test pilots showed significant benefits of the optimized design compared to the BLACK HAWK standard flight control configuration.

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Section: Optimized Baselinementioning

confidence: 99%

Modernized Control Laws for UH-60 BLACK HAWK Optimization and Flight-Test Results

Tischler¹,

Blanken²,

Cheung³

et al. 2005

Journal of Guidance, Control, and Dynamics

Self Cite

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“…Generally, for modern aircraft, it has become increasingly clear that the pilot is not necessarily at fault and that it is the rapid advance in the field of flight-control-systems (FCS) that has increased the pilot-vehicle system's sensitivity to the appearance of unfavourable A/RPC events, by creating, along with the intended beneficial effects, unforeseen opportunities for unfavourable interaction (e.g. delays, saturations, "disconnection" between the inceptor motion and the actual motion of the control surfaces in higher control modes) [111]. The fact that different pilots may show different degrees of proneness to adverse A/RPC does not absolve the design of the vehicle system from its prominent role played in such phenomena.…”

Section: Aircraft/rotorcraft Pilot Couplingsmentioning

confidence: 99%

Practices to identify and preclude adverse Aircraft-and-Rotorcraft-Pilot Couplings – A design perspective

Pavel

Masarati

Gennaretti

et al. 2015

Progress in Aerospace Sciences

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Abstract:The aviation community relies heavily on flight simulators as a fundamental tool for research, pilot training and development of any new aircraft design. The goal of the present 1 Corresponding author Tel. +31 15-2785374, E-mail Address m.d.pavel@tudelft.nl 2 paper is to provide a review on how effective ground simulation is as an assessment tool for unmasking adverse Aircraft-and-Rotorcraft Pilot Couplings (APC/RPC). Although it is generally believed that simulators are not reliable in revealing the existence of A/RPC tendencies, the paper demonstrates that a proper selection of high-gain tasks combined with appropriate motion and visual cueing can reveal negative features of a particular aircraft that may lead to A/RPC. The paper discusses new methods for real-time A/RPC detection that can be used as a tool for unmasking adverse A/RPC. Although flight simulators will not achieve the level of reality of in-flight testing, exposing A/RPC tendencies in the simulator may be the only convenient safe place to evaluate the wide range of conditions that could produce hazardous A/RPC events.

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“…In the case of helicopters, the delay introduced by these elements (in particular, the main rotor) is a key limiting factor for the achievable bandwidth of the flight control system. 12 The contributing elements in the RASCAL RFCS are listed in Table 1. The initial values of the control system gains were designed using total system models of the aircraft at the hover, 80 knot and 130 knot flight conditions.…”

Section: Baseline Control Law Developmentmentioning

confidence: 99%

“…14,15,16 The control law software was generated using Boeing-proprietary pictures-tocode algorithms. That code has, to date, been utilized in the RASCAL flight control computer, but the control laws have also been ported to Simulink ® for parallel use in the project's desktop-to-flight tools.…”

Section: Advanced Control Law Developmentmentioning

confidence: 99%

Design and Testing of Flight Control Laws on the RASCAL Research Helicopter

Frost

Hindson

Moralez

et al. 2002

AIAA Modeling and Simulation Technologies Conference and Exhibit

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Two unique sets of flight control laws were designed, tested and flown on the Army/NASA Rotorcraft Aircrew Systems Concepts Airborne Laboratory (RASCAL) JUH-60A Black Hawk helicopter. The first set of control laws used a simple rate feedback scheme, intended to facilitate the first flight and subsequent flight qualification of the RASCAL research flight control system. The second set of control laws comprised a more sophisticated model-following architecture. Both sets of flight control laws were developed and tested extensively using "desktop-to-flight" modeling, analysis, and simulation tools. Flight test data matched the modelpredicted responses well, providing both evidence and confidence that future flight control development for RASCAL will be efficient and accurate.

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Flying quality analysis and flight evaluation of a highly augmented combat rotorcraft

Cited by 29 publications

References 4 publications

Modernized Control Laws for UH-60 BLACK HAWK Optimization and Flight-Test Results

Modernized Control Laws for UH-60 BLACK HAWK Optimization and Flight-Test Results

Practices to identify and preclude adverse Aircraft-and-Rotorcraft-Pilot Couplings – A design perspective

Design and Testing of Flight Control Laws on the RASCAL Research Helicopter

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