Recent Developments on the Stability and Control of Stochastic Systems

Airframe/propulsion system interactions can strongly affect the stability and control of supersonic cruise aircraft. These interactions generate forces and moments similar in magnitude to those produced by the aerodynamic controls, and can cause significant changes in vehicle damping and static stability. This in turn can lead to large aircraft excursions or high pilot workload, or both. For optimum integration of an airframe and its jet propulsion system, these phenomena may have to be taken into account.

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Advanced Modelling of KF Implemented Flying Wing

International Journal of Engineering Sciences ◽

10.36224/ijes.110404 ◽

2019 ◽

Vol 11 (4) ◽

Author(s):

Widanalage Dakshina ◽

Thiwanka Fernando

Keyword(s):

Extreme Condition ◽

Flow Conditions ◽

Ongoing Research ◽

Stability And Control ◽

Advanced Phase ◽

Landing Gears ◽

Two Phases ◽

The Stability ◽

And Control ◽

Base Design

This research carries out the advanced phase in correlation with the previous published design of KF Implemented Flying Wing. At the primary stage the basic design was considered under omission of non-static components and turbulent conditions. At this stage the simulations have taken a step ahead with improved flow conditions and advanced modeling of the design. As per the design aspects the engines, pylons, landing gears and shape improvements were done with solid modeling. Due to the computational limitations this was divided in to two phases as cruising conditions with non-static components and further studies to be carried out in Takeoff and Landing conditions with extended landing gears. Under the stability and control conditions a separate research is being carried out in achieving the optimum capability. Propfan engine selected for extreme condition evaluations. The implementations were made without disrupting the base design which was presented in phase one basic simulation carried out prior to this. The simulation results deemed to be promising for the first stage as well as the effect of new components. The secondary target areas are to be carried out in further ongoing research as well

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A system to vary the stability and control of a deflected-jet, fixed-wing vtol aircraft

10.2514/6.1964-194 ◽

1964 ◽

Author(s):

F. PAULI

Keyword(s):

Stability And Control ◽

The Stability ◽

And Control ◽

Vtol Aircraft

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Analysis of Robust Stability for a Class of Stochastic Systems via Output Feedback: The LMI Approach

Journal of Function Spaces and Applications ◽

10.1155/2013/873578 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8

Author(s):

Xin-rong Cong ◽

Long-suo Li

Keyword(s):

Linear Matrix Inequality ◽

Robust Stability ◽

Output Feedback ◽

Stochastic Systems ◽

Linear Matrix ◽

Matrix Inequality ◽

Convex Optimization Problem ◽

Control Laws ◽

The Stability ◽

And Control

This paper investigates the robust stability for a class of stochastic systems with both state and control inputs. The problem of the robust stability is solved via static output feedback, and we convert the problem to a constrained convex optimization problem involving linear matrix inequality (LMI). We show how the proposed linear matrix inequality framework can be used to select a quadratic Lyapunov function. The control laws can be produced by assuming the stability of the systems. We verify that all controllers can robustly stabilize the corresponding system. Further, the numerical simulation results verify the theoretical analysis results.

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