Optimal control with exponential decay rate for offshore platform subjected to irregular wave force

Liang, Yan-Jun; Tang, Gong‐You; Ma, Hui

doi:10.1109/icca.2010.5524331

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…In our particular control problem it is convenient to introduce in the cost function definition (15) an exponential decay of rate. 15 We introduce two new vectorsx = xe αt andū = ue αt -which differ from the actual x and u by the exponential term e αt -that enable to redefine the scalar function J as follows:…”

Section: Linear Quadratic Optimal Controlmentioning

confidence: 99%

Development, Modeling and Simulation of Multiple Design Concepts for a Small Unmanned Airship

Acanfora¹,

Marco²,

Lecce³

2011

AIAA Modeling and Simulation Technologies Conference

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A great interest in the utilization of unmanned airships has grown in the past few years, due to their potential applications in surveillance, exploration and monitoring tasks. A study of two possible empennage configurations of an unmanned airship is introduced in this paper. We have developed Matlab/Simulink models to simulate their dynamic behavior and to address the closed-loop flight control problem. In this work our focus is the attenuation of airship lateral oscillations in turbulent air. For this purpose a suitable atmospheric turbulence model has been introduced into the simulations. We have found that an effective control of the airship rolling motions is achieved by using all of the empennage movable aerosurfaces. Initially we have found a set of gains according to the pole-placement method. Subsequently we have carried out the airship feedback optimal control in turbulence according to the technique known as optimal control with exponential rate of decay. * Eng., PhD candidate,

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Section: Linear Quadratic Optimal Controlmentioning

confidence: 99%

Development, Modeling and Simulation of Multiple Design Concepts for a Small Unmanned Airship

Acanfora¹,

Marco²,

Lecce³

2011

AIAA Modeling and Simulation Technologies Conference

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“…Due to the long term influences of sea-floor relief and current flushing, pipeline span appears unavoidably, which will result in static failure or resonance by the actions of gravity, internal fluid and current. The mechanical behavior and deformation character of sea-floor soil, as well as hydrodynamic property are main influential factors for vortex-induced vibration [1,2] which will cause pipeline's fatigue failure [3,4]. So, it's very necessary to study the pipeline's dynamic response under the effects of sea current and soil on the seabed.…”

Section: Instructionmentioning

confidence: 99%

Nonlinear Dynamic Response and Safety Analysis of Suspended Submarine Pipeline

Shao

Xiang

Yang

2011

AMM

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With the application of ANSYS finite element analysis software and environmental data in ChengDao oil field, a nonlinear finite element model of suspended submarine pipeline coupled with sea-floor soil is developed. Discarding the traditional and imprecise pipeline model with double clamped or simply supported ends, the model is founded on the theory of elastic foundation beam, in which the nonlinear effect between pipeline and sea-floor soil is considered. Base on the model we developed, the influences of span length and shear strength of soil at the ends of span on the span’s natural frequency are discussed. And the effects of span length, shear strength of soil and current velocity on the dynamic response of span are also analyzed in this paper. The model we developed in this paper fits the actual structure better, and the analysis is instructive for preventing and controlling the suspending of submarine pipeline.

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Optimal control with exponential decay rate for offshore platform subjected to irregular wave force

Cited by 2 publications

References 9 publications

Development, Modeling and Simulation of Multiple Design Concepts for a Small Unmanned Airship

Development, Modeling and Simulation of Multiple Design Concepts for a Small Unmanned Airship

Nonlinear Dynamic Response and Safety Analysis of Suspended Submarine Pipeline

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