scholarly journals Integrated Flight and Propulsion Operating Modes for Advanced Fighter Engines

1983 ◽  
Author(s):  
Harold Brown ◽  
William S. Fisk
Keyword(s):  
Flight Control ◽  
Exhaust System ◽  
Internal Variable ◽  
Propulsion System ◽  
Fighter Aircraft ◽  
Thrust Vectoring ◽  
Potential Control ◽  
Operating Modes ◽  
System Requirements

This paper presents the results of preliminary studies of advanced propulsion system requirements and capabilities for the next generation of fighter aircraft. It represents an examination of current and advanced concepts of internal variable engine geometry and advanced exhaust system concepts for use in expanding the role of the propulsion system in the flight process. Special engine operating modes are defined and their potential capabilities are described. In-flight thrust vectoring and reversing concepts are described and their use in providing propulsive pitch and yaw forces for flight control assist are discussed. Potential control concepts and requirements for implementing the advanced engine operating modes are also described.

Editorial on Future Jet Technologies

2014 ◽  
Vol 31 (4) ◽  
Author(s):  
Benjamin Gal-Or
Keyword(s):  
Flight Control ◽  
Landing Gear ◽  
Engineering Practice ◽  
Mobile Telecommunication ◽  
Fighter Aircraft ◽  
Thrust Vectoring ◽  
Jet Engine ◽  
Stealth Technology ◽  
Forced Landing ◽  
Expected Benefits

AbstractThe jet engine is the prime flight controller in post-stall flight domains where conventional flight control fails, or when the engine prevents catastrophes in training, combat, loss of all airframe hydraulics (the engine retains its own hydraulics), loss of one engine, pilot errors, icing on the wings, landing gear and runway issues in takeoff and landing and in bad-whether recoveries. The scientific term for this revolutionary technology is “jet-steering”, and in engineering practice – “thrust vectoring”, or “TV”.Jet-Steering in advanced fighter aircraft designs is integrated with stealth technology. The resulting classified Thrust-Vectoring-Stealth (“TVS”) technology has generated a second jet-revolution by which all Air-&-Sea-Propulsion Science and R&D are now being reassessed.ClassifiedOne, and perhaps a key conclusion presented here, means that bothMobile telecommunication of safe links between flyers and combat drones (“UCAVs”) at increasingly deep penetrations into remote, congested areas, can gradually be purchased-developed-deployed and then operated by extant cader of tens of thousandsWe also provide 26 references [17–43] to a different, unclassified technology that enhances TV-inducedExpected benefits include anti-terror recoveries from emergencies, like forced landing on unprepared runways or highways, or recoveries from all airframe-hydraulics-outs, asymmetric ice on wings, landing gear catastrophes, and recoveries from pilot errors and bad-whether incidents [Rule 9(7)].

scholarly journals Vectoring Exhaust Systems for STOL Tactical Aircraft

1983 ◽  
Author(s):  
R. F. Tape ◽  
W. R. Hartill ◽  
S. Curry ◽  
T. J. Jones
Keyword(s):  
Analytical Study ◽  
Exhaust System ◽  
Field Performance ◽  
Propulsion System ◽  
Thrust Vectoring ◽  
Short Takeoff And Landing ◽  
Glide Slope ◽  
System Configurations ◽  
Exhaust Systems

An analytical study has been performed to investigate the performance and application of four exhaust nozzle concepts with the potential to enhance the short takeoff and landing capabilities of advanced tactical aircraft for the 1990’s. The exhaust system concepts include side and rear exhaust thrust vectoring systems with axisymmetric and non-axisymmetric nozzles. To investigate the application of the nozzle concepts, advanced tactical aircraft have been configured which will operate from 700 or 1000 feet fields. Four different propulsion system configurations were used, each producing glide slope equilibrium in a different way. The characteristics of these STOL aircraft are compared with those of a CTOL aircraft designed to perform the same mission. The results show that the short field performance can be achieved with little aircraft TOGW or LCC penalty. The study also identifies promising configurations for STOL tactical aircraft.

Vectoring Exhaust Systems for STOL Tactical Aircraft

1983 ◽  
Vol 105 (3) ◽  
pp. 654-662 ◽  
Author(s):  
R. F. Tape ◽  
W. R. Hartill ◽  
Lt. S. Curry ◽  
T. J. Jones
Keyword(s):  
Analytical Study ◽  
Exhaust System ◽  
Field Performance ◽  
Propulsion System ◽  
Thrust Vectoring ◽  
Short Takeoff And Landing ◽  
Glide Slope ◽  
System Configurations ◽  
Exhaust Systems

An analytical study has been performed to investigate the performance and application of four exhaust nozzle concepts with the potential to enhance the short takeoff and landing capabilities of advanced tactical aircraft for the 1990s. The exhaust system concepts include side and rear exhaust thrust vectoring systems with axisymmetric and nonaxisymmetric nozzles. To investigate the application of the nozzle concepts, advanced tactical aircraft have been configured which will operate from 700 or 1000 feet fields. Four different propulsion system configurations were used, each producing glide slope equilibrium in a different way. The characteristics of these STOL aircraft are compared with those of a CTOL aircraft designed to perform the same mission. The results show that the short field performance can be achieved with little aircraft TOGW or LCC penalty. The study also identifies promising configurations for STOL tactical aircraft.

scholarly journals Anthonomus rubi on Strawberry Fruit: Its Biology, Ecology, Damage, and Control from an IPM Perspective

Insects ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 701
Author(s):  
Lorenzo Tonina ◽  
Giulia Zanettin ◽  
Paolo Miorelli ◽  
Simone Puppato ◽  
Andrew G. S. Cuthbertson ◽  
...  
Keyword(s):  
Feeding Activity ◽  
Host Feeding ◽  
Mass Trapping ◽  
Natural Habitats ◽  
Potential Control ◽  
North East ◽  
Monitoring Tools ◽  
Anthonomus Rubi ◽  
And Control

The strawberry blossom weevil (SBW), Anthonomus rubi, is a well-documented pest of strawberry. Recently, in strawberry fields of Trento Province (north-east Italy), new noteworthy damage on fruit linked to SBW adults was observed, combined with a prolonged adult activity until the autumn. In this new scenario, we re-investigated SBW biology, ecology, monitoring tools, and potential control methods to develop Integrated Pest Management (IPM) strategies. Several trials were conducted on strawberry in the laboratory, field and semi-natural habitats. The feeding activity of adult SBW results in small deep holes on berries at different stages, causing yield losses of up to 60%. We observed a prolonged survival of newly emerged adults (>240 days) along with their ability to sever flower buds without laying eggs inside them in the same year (one generation per year). SBW adults were present in the strawberry field year-round, with movement between crop and no crop habitats, underlying a potential role of other host/feeding plants to support its populations. Yellow sticky traps combined with synthetic attractants proved promising for both adult monitoring and mass trapping. Regarding control, adhesive tapes and mass trapping using green bucket pheromone traps gave unsatisfactory results, while the high temperatures provided by the black fabric, the periodic removal of severed buds or adults and Chlorpyrifos-methyl application constrained population build-up. The findings are important for the development of an IPM strategy.

Robust fault-tolerant flight control of quadrotor against faults in multiple motors

2021 ◽  
pp. 095441002199954
Author(s):  
Dinesh D Dhadekar ◽  
S E Talole
Keyword(s):  
Flight Control ◽  
Tracking Control ◽  
Fault Tolerant ◽  
External Disturbances ◽  
Detection And Identification ◽  
Attitude Tracking ◽  
Fault Detection And Identification ◽  
Attitude Tracking Control ◽  
Disturbance Estimator

In this article, position and attitude tracking control of the quadrotor subject to complex nonlinearities, input couplings, aerodynamic uncertainties, and external disturbances coupled with faults in multiple motors is investigated. A robustified nonlinear dynamic inversion (NDI)-based fault-tolerant control (FTC) scheme is proposed for the purpose. The proposed scheme is not only robust against aforementioned nonlinearities, disturbances, and uncertainties but also tolerant to unexpected occurrence of faults in multiple motors. The proposed scheme employs uncertainty and disturbance estimator (UDE) technique to robustify the NDI-based controller by providing estimate of the lumped disturbance, thereby enabling rejection of the same. In addition, the UDE also plays the role of fault detection and identification module. The effectiveness and benefits of the proposed design are confirmed through 6-DOF simulations and experimentation on a 3-DOF Hover platform.

The Role of Nonmonotonic Representations in Requirements Engineering

1998 ◽  
Vol 08 (03) ◽  
pp. 385-399 ◽  
Author(s):  
Grigoris Antoniou
Keyword(s):  
Software Engineering ◽  
Knowledge Representation ◽  
Requirements Engineering ◽  
Nonmonotonic Reasoning ◽  
Default Reasoning ◽  
Requirements Prioritization ◽  
Evolving System ◽  
System Requirements

This paper discusses the significance of nonmonotonic reasoning, a method from the knowledge representation area, to mainstream software engineering. In particular, we discuss why the use of defaults in specifications is an adequate way of addressing some of the most important problems in requirements engineering, such as: The problem of identifying and dealing with inconsistencies; evolving system requirements; requirements prioritization; and the quality of specifications with respect to naturalness and compactness. We argue that these problems need to be addressed in a principled, formal way, and that default reasoning provides adequate mechanisms to deal with them.

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