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Chu, Tianyue (author), Garcia-Recuero, Alvaro (author), Iordanou, Costas (author), Smaragdakis, G. (author), Laoutaris, Nikolaos (author)We present a Federated Learning (FL) based solution for building a distributed classifier capable of detecting URLs containing sensitive content, i.e., content related to categories such as health, political beliefs, sexual orientation, etc. Although such a classifier addresses the limitations of previous offline/centralised classifiers, it is...conference paper 2023
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Paul, Acquatella B. (author), van Kampen, E. (author), Chu, Q. P. (author)This paper presents a sampled-data form of the recently reformulated incremental nonlinear dynamic inversion (INDI) applied for robust spacecraft attitude control. INDI is a combined model- and sensor-based approach mostly applied for attitude control that only requires an accurate control effectiveness model and measurements of the state and...conference paper 2022
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Zhang, Y. (author), Huang, Y. (author), Chu, Q. P. (author), de Visser, C.C. (author)In this paper, an online flight envelope protection system is developed and implemented on impaired aircraft with structural damage. The whole protection system is designed to be a closed-loop of several sub-systems, including system identification, damage classification, flight-envelope prediction and fault-tolerant control. Based on the...conference paper 2020
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Keijzer, Twan (author), Looye, Gertjan (author), Chu, Q. P. (author), van Kampen, E. (author)This paper discusses the design, implementation and flight testing of an incremental Backstepping (IBS) based manual flight control law with angular accelerometer (AA) feedback. The main advantages of incremental control laws are that they only require a partial model of the system and are of low complexity. Incremental control laws for...conference paper 2019
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Wang, Xuerui (author), van Kampen, E. (author), Chu, Q. P. (author)For mitigating the chattering effect in the sliding mode control (SMC), many adaption mechanisms have been proposed to reduce the switching gains. However, less attention is paid to the control structure, which influences the resulting uncertainty term and determines the minimum possible gains. This paper compares three control structures for...conference paper 2019
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Goedhart, Menno (author), van Kampen, E. (author), Armanini, S.F. (author), de Visser, C.C. (author), Chu, Q. P. (author)Flight control of Flapping Wing Micro Air Vehicles is challenging, because of their complex dynamics and variability due to manufacturing inconsistencies. Machine Learning algorithms can be used to tackle these challenges. A Policy Gradient algorithm is used to tune the gains of a Proportional-Integral controller using Reinforcement Learning. A...conference paper 2018
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Ferrier, Yvonne L. (author), Nguyen, Nhan T. (author), Ting, Eric (author), Chaparro, Daniel (author), Wang, Xuerui (author), de Visser, C.C. (author), Chu, Q. P. (author)This paper presents a novel active gust load alleviation approach within a multi-objective flight control framework developed by NASA for a flexible wing aircraft. The aircraft model is based on the NASA Generic Transport Model (GTM). The wing structures incorporate an aerodynamic control surface known as the Variable Camber Continuous...conference paper 2018
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Zhang, Y. (author), de Visser, C.C. (author), Chu, Q. P. (author)This paper reports the latest progress in the development of a database-driven safe flight envelope prediction system. By building up a database containing safe flight envelopes of different damage and fault scenarios, the challenges associated with online flight envelope prediction can be circumvented. The database is designed for different...conference paper 2018
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Wang, Xuerui (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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Wang, Xuerui (author), van Kampen, E. (author), Chu, Q. P. (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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van 't Veld, Ronald (author), van Kampen, E. (author), Chu, Q. P. (author)Incremental nonlinear dynamic inversion (INDI) is a variation on nonlinear dynamic inversion (NDI), retaining the high-performance characteristics, while reducing model dependency and increasing robustness. After a successful flight test with a multirotor micro aerial vehicle, the question arises whether this technique can be used to...conference paper 2018
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Çakiroğlu, Can (author), van Kampen, E. (author), Chu, Q. P. (author)Incremental Nonlinear Dynamic Inversion (INDI) is a robust nonlinear control technique that is an adaptation of nonlinear dynamic inversion (NDI). By assuming time scale separation between fast and slow dynamics, and by using angular acceleration feedback, the inner loop of INDI directly controls angular accelerations with incremental control...conference paper 2018
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Grondman, Fabian (author), Looye, Gertjan H.N. (author), Kuchar, Richard O. (author), Chu, Q. P. (author), van Kampen, E. (author)This paper describes the design, implementation and flight testing of flight control laws based on Incremental Nonlinear Dynamic Inversion (INDI). The method compares com- manded and measured accelerations to compute increments on the current control de ec- tions. This results in highly robust control solutions with respect to model...conference paper 2018
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van der Sman, E.S. (author), Smeur, E.J.J. (author), Remes, B.D.W. (author), de Wagter, C. (author), Chu, Q. P. (author)Maintaining stable flight during high turbulence intensities is challenging for fixed-wing micro air vehicles (MAV). Two methods are proposed <br/>to improve the disturbance rejection performance of the MAV: incremental nonlinear dynamic inversion (INDI) control and phaseadvanced pitch probes. INDI uses the angular acceleration measurements to...conference paper 2017
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Huang, Y. (author), Pool, D.M. (author), Stroosma, O. (author), Chu, Q. P. (author)Hydraulic driven manipulators face serious control problems due to the nonlinear system dynamics and model and parametric uncertainties of hydraulic actuators. In this paper, a novel sensor-based Incremental Nonlinear Dynamic Inversion controller is applied to force tracking control of hydraulic actuators of a hexapod flight simulator motion...conference paper 2017
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Zhou, Y. (author), van Kampen, E. (author), Chu, Q. P. (author)This paper presents an adaptive control technique to deal with spacecraft attitude tracking and disturbance rejection problems in the presence of model uncertainties. Approximate dynamic programming has been proposed to solve adaptive, optimal control problems without using accurate systems models. Within this category, linear approximate...conference paper 2017
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- Wang, X. (author), van Kampen, E. (author), Chu, Q. P. (author) conference paper 2017
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Shuang, Weifang (author), Zhang, S. (author), Wu, Xue (author), van Kampen, E. (author), Chu, Q. P. (author)<br/>conference paper 2017
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Lu, P. (author), van Kampen, E. (author), Chu, Q. P. (author)<br/>conference paper 2017
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- Tang, D (author), Pool, D.M. (author), Stroosma, O. (author), Chu, Q. P. (author), de Visser, C.C. (author) conference paper 2016