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Showing 1 to 15 of 15 for “"Flying Qualities"”.
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Flying Qualities Built-in-Test for Unmanned Aerial Systems
<p>This paper presents a flying qualities built-in-test for UAS application with the scope limited to the longitudinal axis. A doublet input waveform excites the AV and both α and q are used by EUDKF to estimate the A and B matrices which are short period approximations of the system. ζ, ω, GM, PM, …
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Application of hypersonic vehicle flying qualities criteria and computational considerations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Evolution of Flying Qualities Analysis: Problems for a New Generation of Aircraft
… challenges in the development and application of flying qualities criteria for modern aircraft are addressed in this dissertation. The history of flying qualities is traced from its origins to modern day techniques as applied to piloted aircraft. Included in this historical review is the case that …
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A comparison of the use of classical and modern control design techniques for improving the lateral-directional powered approach flying qualities of the F-14 aircraft
… the F-14 aircraft exhibited several major flying qualities deficiencies. To correct these deficiencies, the Department of the Navy instigated a program to replace the analog system with digital flight control computers incorporating enhanced control laws. A new control law was designed for …
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Flight Dynamic Constraints in Conceptual Aircraft Multidisciplinary Analysis and Design Optimization
… novel approach, called the Variance Constrained Flying Qualities (VCFQ) approach, is developed to include closed-loop dynamic performance metrics in the design optimization process. The VCFQ approach overcomes the limitations of previous methods in the literature, which only functioned for fully …
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Dynamic Modeling of a Supersonic Tailless Aircraft with All-moving Wingtip Control Effectors
… dynamics were improved to Level 1 flying qualities through use of a modified roll/yaw damper. The modified controller fed yaw rate back to both the all-moving tips and roll effector. The six degree-of-freedom model was augmented with actuator dynamics for the elevator, roll …
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Drag considerations for flight in atmospheric turbulence
… is used to retain the dynamic characteristic (flying qualities) of the airplane. The response of the aircraft to an external disturbance such as a gust (modeled with a stochastic process) is studied in terms of drag versus CG position. Finally, it is shown that the position of the CG for …
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Safe online learning for nonlinear dynamical systems using control contraction metrics
… contraction metrics to aircraft designed to meet flying qualities requirements based on linear time invariant theory is bridged. A novel cascaded two loop algorithm is developed to explicitly place the eigenvalues of the inner and outer loop of a differential feedback controller. Further a …
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Development of a Remotely-Piloted Vehicle Platform to Support Implementation, Verification, and Validation of Pilot Control Systems
… use of a set of metrics for evaluating handling qualities with pilot in the loop configuration. The main objective of this study is to provide software and hardware tools to support performance evaluation of control systems designed to compensate for Pilot Induced Oscillations (PIOs). A …
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Dynamic Stability and Handling Qualities of Small Unmanned-Aerial-Vehicles UNMANNED-AERIAL-VEHICLES
… predicting the dynamic stability and handling qualities of small UAVs was created for use in the design stage of new small UAV concept development. This program was verified by inputting data for a Cessna-182, and by then comparing the program output with that of a similar program developed by …
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A unified method to predict pilot-induced oscillations
… of the M2-F2 is most likely caused by poor flying qualities, a unified PIO analysis shows exactly which dynamic elements couple with the pilot dynamics to cause oscillations. The analysis results show the PIO amplitude and frequency that occurred during flight testing and piloted simulation …
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Aircraft departure resistance prediction using structured singular values
… is indicated by the current military aircraft flying qualities specification, MIL-STD-1797. As it becomes more important to understand the dynamics of aircraft at such flight conditions, the need for a meaningful and useful assessment of aircraft departure resistance in varying attitudes will …
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A Comparison of Control Allocation Methods for the F-15 ACTIVE Research Aircraft Utilizing Real-Time Piloted Simulations
… the aircraft will still demonstrate acceptable flying qualities. A direct comparison of the performance of each of the two control allocators in a reduced global position limits configuration is investigated. Due to the highly redundant control effector suite of the F-15 ACTIVE, the aircraft, …
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Aircraft loss-of-control prevention via backup flight control law design and flight envelope protection
… loop that is designed to restore prescribed flying qualities for a family of uncertain aircraft models with similar vertical-tail damage. Simulation results with NASA's Transport Class Model demonstrate that the developed backup flight control law is able to recover directional control …
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Aeroelasticidad de una aeronave en presencia de nolinealidades estructurales concentradas
… engineering that studies the vibration of flying flexible structures as affected by the surrounding air. The aeroelastic behaviour of an aircraft depends basically of four major inputs: structure, inertia, aerodynamics, and flight control systems (aeroservoelasticity). The classical …