Results 41 to 50 of about 184 (135)

Tuning Colloidal Stability and Photothermal Conversion Efficiency of Graphite Nanofluids via Anionic‐Nonionic Surfactant Engineering

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Graphite nanofluids were stabilized using a mixed SDS/Tween 80 surfactant system. The optimized formulation exhibited enhanced colloidal stability, red‐shifted UV–Vis absorption, and improved photothermal conversion under solar irradiation. Achieving stable dispersion of graphite flakes (GFs) in aqueous media remains a critical challenge in developing ...
Ahmad Chehade, Shoaib Anwer, Md Islam, Eiyad Abu‐Nada   +3 more
wiley   +1 more source

A highly accurate numerical method for solving boundary value problem of generalized Bagley‐Torvik equation

Mathematical Methods in the Applied Sciences, EarlyView.
A highly accurate numerical method is given for the solution of boundary value problem of generalized Bagley‐Torvik (BgT) equation with Caputo derivative of order 0<β<2$$ 0<\beta <2 $$ by using the collocation‐shooting method (C‐SM). The collocation solution is constructed in the space Sm+1(1)$$ {S}_{m+1}^{(1)} $$ as piecewise polynomials of degree at ...
Suzan Cival Buranay, Mtema James Chin, Nazim I. Mahmudov   +2 more
wiley   +1 more source

Control Of Pendulum On A Cart With State Dependent Riccati Equations

, 2008
{"references": ["Michael Athans, \"The Role and Use of the Stochastic Linear-Quadratic-Gaussian Problem in Control System Design,\" in Plastics, IEEE Transactions on Automatic Control, Vol. AC-16, No. 6, December 1971, pp.\n529-552.", "Brian D. O. Anderson and John B. Moore, Optimal Control: Linear\nQuadratic Methods. New Delhi: Prentice Hall of India,
N. M. Singh, Jayant Dubey, Ghanshyam Laddha   +2 more
openaire   +1 more source

Unveiling New Perspectives on the Hirota–Maccari System With Multiplicative White Noise

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT In this study, we delve into the stochastic Hirota–Maccari system, which is subjected to multiplicative noise according to the Itô sense. The stochastic Hirota–Maccari system is significant for its ability to accurately model how stochastic affects nonlinear wave propagation, providing valuable insights into complex systems like fluid dynamics
Mohamed E. M. Alngar, Khaled A. Gepreel, Reham M. A. Shohib, Yakup Yildirim   +3 more
wiley   +1 more source

Hybrid Quasi-Optimal PID-SDRE Quadrotor Control

Energies, 2022
In the paper, a new cascade control system for an autonomous flight of an unmanned aerial vehicle (UAV) based on Proportional–Integral–Derivative (PID) and finite-time State-Dependent Riccati Equation (SDRE) control is proposed.
Wojciech Giernacki, Sławomir Stępień, Marcin Chodnicki, Agnieszka Wróblewska   +3 more
doaj   +1 more source

A PD-Type State-Dependent Riccati Equation With Iterative Learning Augmentation for Mechanical Systems

IEEE/CAA Journal of Automatica Sinica, 2022
This work proposes a novel proportional-derivative (PD)-type state-dependent Riccati equation (SDRE) approach with iterative learning control (ILC) augmentation. On the one hand, the PD-type control gains could adopt many useful available criteria and tools of conventional PD controllers.
Saeed Rafee Nekoo, José Ángel Acosta, Guillermo Heredia, Anibal Ollero   +3 more
openaire   +4 more sources

A Gauss–Newton Method for ODE Optimal Tracking Control

Optimal Control Applications and Methods, EarlyView.
This paper presents a Gauss–Newton method for optimal tracking control of ordinary differential equations (ODEs). The approach formulates the problem as an infinite‐dimensional optimization problem, allowing both control functions and uncertain model parameters to be optimized.
Vicky Holfeld, Michael Burger, Claudia Schillings   +2 more
wiley   +1 more source

A Nonlinear Optimal Guidance Law with Terminal Impact Angle Constraint [PDF]

International Journal of Computational Intelligence Systems, 2011
State-dependent Riccati equation (SDRE) techniques are rapidly emerging as general design methods for nonlinear controllers. A nonlinear optimal guidance law with impact angle constraint is derived for planar engagements to attack stationary targets. The
Haoping She, Shuxing Yang, Hui Ni, Horst Baier   +3 more
doaj   +1 more source

SDRE-based primary control of DC Microgrids equipped by a fault detection/isolation mechanism

Energy Reports, 2022
Due to the nonlinear dynamics of direct current (DC) microgrids, the existence of input constraints, and their multi-input multi-output (MIMO) nature, classical linear controllers cannot provide an appropriate performance in a wide range of operations ...
Yazdan Batmani, Yousef Khayat, Assad Salimi, Hassan Bevrani, Sohrab Mirsaeidi, Charalambos Konstantinou   +5 more
doaj   +1 more source

Optimal Homogeneous ℒp$$ {\boldsymbol{\mathcal{L}}}_{\boldsymbol{p}} $$‐Gain Controller

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Nonlinear ℋ∞$$ {\mathscr{H}}_{\infty } $$‐controllers are designed for arbitrarily weighted, continuous homogeneous systems with a focus on systems affine in the control input. Based on the homogeneous ℒp$$ {\mathcal{L}}_p $$‐norm, the input–output behavior is quantified in terms of the homogeneous ℒp$$ {\mathcal{L}}_p $$‐gain as a ...
Daipeng Zhang, Benjamin Calmbach, Jaime A. Moreno, Johann Reger   +3 more
wiley   +1 more source