Searched for: author:"Wang, X."
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Wang, X. (author)
The swift growth of air traffic volume stresses the importance of flight safety enhancement. Statistical data shows that fly-by-wire technology with automatic flight control systems can effectively reduce the fatal accident rate of loss of control in-flight. Although the dynamics of an aircraft are nonlinear and time-varying, it is common...
doctoral thesis 2019
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Wang, Q. (author), Wang, X. J. (author), Li, G. Q. (author), Liu, Y. (author)
Band segregation has been found in the H13 die steel produced by the electroslag remelting (ESR) technology. Chemical and metallographic studies have been carried out on a one ton ESR ingot of H13 die steel, so as to understand the formation mechanism of the band segregation. The results indicate that the T.O content and S content decreased...
journal article 2019
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Wang, X. (author), van Kampen, E. (author), Chu, Q. P. (author), Lu, Peng (author)
As a sensor-based control method, incremental nonlinear dynamic inversion (INDI) has been applied to various aerospace systems and has shown desirable robust performance against aerodynamic model uncertainties. However, its previous derivation based on the time scale separation principle has some limitations. There is also a need for stability...
journal article 2019
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Wang, X. (author), van Kampen, E. (author), Chu, Q. P. (author)
This paper proposes a novel control framework that combines the recently reformulated incremental nonlinear dynamic inversion with (higher-order) sliding-mode controllers/observers, for generic multi-input/multi-output nonlinear systems, named incremental sliding-mode control. As compared to the widely used approach that designs (higher-order...
journal article 2019
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Wang, X. (author), Sun, S. (author), van Kampen, E. (author), Chu, Q. P. (author)
This paper proposes an Incremental Sliding Mode Control driven by Sliding Mode Disturbance Observers (INDI-SMC/SMDO), with application to a quadrotor fault tolerant control problem. By designing the SMC/SMDO based on the control structure of the sensor-based Incremental Nonlinear Dynamic Inversion (INDI), instead of the model-based Nonlinear...
journal article 2019
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Wang, X. (author), Kooij, R.E. (author), Moreno, Yamir (author), Van Mieghem, P.F.A. (author)
Networks are often made up of several layers that exhibit diverse degrees of interdependencies. An interdependent network consists of a set of graphs G that are interconnected through a weighted interconnection matrix B, where the weight of each intergraph link is a non-negative real number p. Various dynamical processes, such as...
journal article 2019
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Wang, X. (author), Shan, M. (author), Liu, X. (author), Wang, M. (author), Doherty, Cara M. (author), Osadchii, D. (author), Kapteijn, F. (author)
Increasing helium use in research and production processes necessitates separation techniques to secure sufficient supply of this noble gas. Energy-efficient helium production from natural gas is still a big challenge. Membrane gas separation technology could play an important role. Herein, a novel poly(p-phenylene benzobisimidazole) (PBDI)...
journal article 2019
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Shan, M. (author), Liu, X. (author), Wang, X. (author), Liu, Z. (author), Ganapathy, S. (author), Gascon Sabate, J. (author), Kapteijn, F. (author)
Membranes with high selectivity and permeance are needed to reduce energy consumption in hydrogen purification and pre-combustion CO <sub>2</sub> capture. Polybenzimidazole (PBI) is one of the leading membrane materials for this separation. In this study, we present superior novel supported PBI (poly(p-phenylene benzobisimidazole), PBDI)...
journal article 2019
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Liu, X. (author), Wang, X. (author), Bavykina, A.V. (author), Chu, L. (author), Shan, M. (author), Sabetghadam, Anahid (author), Miro, H. (author), Kapteijn, F. (author), Gascon, Jorge (author)
The preparation and the performance of mixed matrix membranes based on metal-organic polyhedra (MOPs) are reported. MOP fillers can be dispersed as discrete molecular units (average 9 nm in diameter) when low filler cargos are used. In spite of the low doping amount (1.6 wt %), a large performance enhancement in permeability, aging resistance...
journal article 2018
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Zhao, Jie (author), Guo, Leicheng (author), He, Qing (author), Wang, Z.B. (author), van Maren, D.S. (author), Wang, X. (author)
Examination of large scale, alluvial estuarine morphology and associated time evolution is of particular importance regarding management of channel navigability, ecosystem, etc. In this work, we analyze morphological evolution and changes of the channel-shoal system in the Changjiang Estuary, a river- and tide-controlled coastal plain estuary,...
journal article 2018
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Wang, X. (author), van Kampen, E. (author), Chu, Q. (author), Lu, P (author)
As a sensor-based control approach, the Incremental Nonlinear Dynamic Inversion (INDI) method has been successfully applied on various aerospace systems and shown desirable robust performance to aerodynamic model uncertainties. However, its previous derivations based on the so-called time scale separation principle is not mathematically rigorous...
conference paper 2018
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Swaminathan, Siva (author), Wang, X. (author), Zhou, Bingyu (author), Baldi, S. (author)
Heating, ventilation and air-conditioning (HVAC) units in buildings form a system-of-subsystems entity that must be accurately integrated and controlled by the building automation system to ensure the occupants' comfort with reduced energy consumption. As control of HVACs involves a standardized hierarchy of high-level set-point control and...
journal article 2018
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Shan, M. (author), Seoane, Beatriz (author), Pustovarenko, A. (author), Wang, X. (author), Liu, X. (author), Yarulina, I. (author), Abou-Hamad, Edy (author), Kapteijn, F. (author), Gascon, Jorge (author)
The performance of mixed-matrix membranes (MMMs) based on Matrimid<sup>®</sup> and benzimidazole-linked polymers (BILPs) have been investigated for the separation CO<sub>2</sub>/N<sub>2</sub> and the dependency on the filler porosity. BILPs with two different porosities (BILP-101 and RT-BILP-101) were synthesized through controlling the...
journal article 2018
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Shan, M. (author), Liu, X. (author), Wang, X. (author), Yarulina, I. (author), Seoane, Beatriz (author), Kapteijn, F. (author), Gascon, Jorge (author)
The development of new membranes with high H<sub>2</sub> separation performance under industrially relevant conditions (high temperatures and pressures) is of primary importance. For instance, these membranes may facilitate the implementation of energy-efficient precombustion CO<sub>2</sub> capture or reduce energy intensity in other...
journal article 2018
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Rueda, Diego F. (author), Calle, Eusebi (author), Wang, X. (author), Kooij, R.E. (author)
Interconnection between telecommunication networks and other critical infrastructures is usually established through nodes that are spatially close, generating a geographical interdependency. Previous work has shown that in general, geographically interdependent networks are more robust with respect to cascading failures when the...
journal article 2018
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Wang, X. (author), van Kampen, E. (author), Chu, Q. P. (author), De Breuker, R. (author)
In this paper, an Incremental Nonlinear Dynamic Inversion (INDI) controller is<br/>developed for the flexible aircraft gust load alleviation (GLA) problem. First, a flexible aircraft model captures both inertia and aerodynamic coupling effects between flight dynamics and structural vibration dynamics is presented. Then an INDI GLA controller is...
conference paper 2018
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Natella, M. (author), Wang, X. (author), De Breuker, R. (author)
This paper presents a unified framework for aeroelastic tailoring of free-flying aircraft with composite wings. A continuous-time state-space model is used to describe the flow. The 3D composite wing structures is condensed into a Timoshenko beam model by means of a cross-sectional modeler. The aerodynamic and structural models are closely...
conference paper 2018
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Wang, X. (author)
The rapid increase of wind power in the power grid results in high grid connection requirements for wind turbines. Moreover, the reliability of wind turbines becomes more and more important, especially in offshore applications. One potential solution for these demands is the wind turbine drive-train based on the brushless doubly-fed induction...
doctoral thesis 2017
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Qin, Lilong (author), Wu, Manqing (author), Wang, X. (author), Dong, Zhen (author)
Motivated by the sparsity of filter coefficients in full-dimension space-Time adaptive processing (STAP) algorithms, this paper proposes a fast ℓ1-regularized STAP algorithm based on the alternating direction method of multipliers to accelerate the convergence and reduce the calculations. The proposed algorithm uses a splitting variable to...
journal article 2017
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Wang, X. (author), Liu, D. (author), Lahaye, D.J.P. (author), Polinder, H. (author), Ferreira, J.A. (author)
The brushless doubly-fed induction machine (DFIM) has great potential as a variable-speed generator for wind turbine applications. This special machine has a richer space-harmonic spectrum due to its special nested-loop rotor construction compared with conventional induction machines. It may result in higher iron losses, higher torque ripple and...
conference paper 2017
Searched for: author:"Wang, X."
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