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A Differential Flatness Approach for Rotorcraft Fault Detection

第24届中国控制与决策会议

作者： Nayibe Chio Cho Hakim Bouadi Felix Mora-Camino Programa de Ingeniería Mecatrónica UnaB Bucaramanga Colombia lara ENAC Toulouse 31055France

The purpose of this communication is to contribute to the development of a new trajectory management capability for an engine-out transportation aircraft. Engine-out is a dramatic situation for flight safety and this study focuses on the design of a management system for emergency trajectories at this special situation. First the gliding characteristics and flying qualities of a transport aircraft with total engine failure are analyzed while gliding range estimation is considered. Then a new representation of the flight dynamics of an engine-out aircraft is proposed where the space variable is chosen as independent parameter instead of the time variable. This allows to propose a new formulation of the corresponding trajectory optimization problem and to develop a reverse dynamic programming solution technique. Simulation results are displayed and new development perspectives are discussed.

关键词： Flight Safety Trajectory Optimization Quasi Steady Glide Reverse Dynamic Programming

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A Differential Flatness Approach for Rotorcraft Fault Detect...

Single-phase Thirteen-level Dual-boost Inverter Based Shunt Active Power Filter Control Using Resonant and Fuzzy Logic Controllers

第二十七届中国控制会议

作者： Drouin Antoine Doncescu Andrei Mora-Camin Félixo lara Air Transportation DepartmentENAC31055 ToulouseFrance LAAS du CNRS 31077 ToulouseFrance

The purpose of this communication is to investigate the usefulness of the differential flatness theory of a non linear system such as a four rotor aircraft to design an efficient fault detection *** flight dynamics equations of a four rotor aircraft as well as the dynamics of the engines controlling the rotors are *** the differential flatness of the rotorcraft flight dynamics is displayed and finally a fault detection scheme,based on the differential flatness property,is proposed.

关键词： Rotorcraft flight mechanics Differential flatness Fault detection

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 849-863页

作者： Shaik Gouse Basha Venkatesan Mani Subbarao Mopidevi Vignan's Foundation for Science Technology and Research Andhra Pradesh522213India Vignan's lara Institute of Technology and Science Vadlamudi522213India

This paper addresses the power quality improvement of a single-phase utility grid using a thirteen-level dualboost inverter(TLDBI)-shunt active filter(SAF).The TLDBI uses a single DC source of low voltage magnitude and five switched capacitor arrangement to achieve self-balanced thirteen level output ***,the charging and voltage balancing of the capacitor is achieved by proper switching sequence control in a series,through which boosted inverter output voltage levels are *** with the tradional H-bridge multilevel inverters(MLIs),all the elements in the proposed TLDBI are able to withstand a voltage stress which is equal to the input DC *** feature ensures the performance of the proposed TLDBI in high-frequency *** power at the electrical grid is highly affected by a wide range of non-linear *** proposed SAF is used for measuring and controlling the current flow from source to *** difference between the targeted and actual currents from the utility grid is measured by using the modified synchronous reference frame(SRF)*** estimated error current is used by the controllers to predict the optimum suitable switching angle and modulation index(MI)to the *** this paper,the traditional proportional-integral(PI)controller,fuzzy logic controller(FLC)and proportional resonant controller(PRC)are compared and the results are presented to validate the performance of *** stability and robustness of the proposed controller is evaluated using Bode,Root locus,and Nyquist *** modeling and analysis of the proposed system are done using MATLAB/Simulink *** simulation results are presented in the various MI of TLDBI and also subjected to non-linear load *** results are also compared to the claim novelty of the proposed study.

关键词： FLC power quality PRC thirteen-level DBI shunt active filter single-phase utility grid SRF

A Comparative Study of Nonlinear Time-Varying Process Modeling Techniques: Application to Chemical Reactor

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Journal of Intelligent Learning Systems and Applications 2012年第1期4卷 20-28页

作者： Errachdi Ayachi Saad Ihsen Benrejeb Mohamed lara Automatique Tunis Tunisia.

This paper proposes the design and a comparative study of two nonlinear systems modeling techniques. These two approaches are developed to address a class of nonlinear systems with time-varying parameter. The first is a Radial Basis Function (RBF) neural networks and the second is a Multi Layer Perceptron (MLP). The MLP model consists of an input layer, an output layer and usually one or more hidden layers. However, training MLP network based on back propagation learning is computationally expensive. In this paper, an RBF network is called. The parameters of the RBF model are optimized by two methods: the Gradient Descent (GD) method and Genetic Algorithms (GA). However, the MLP model is optimized by the Gradient Descent method. The performance of both models are evaluated first by using a numerical simulation and second by handling a chemical process known as the Continuous Stirred Tank Reactor CSTR. It has been shown that in both validation operations the results were successful. The optimized RBF model by Genetic Algorithms gave the best results.

关键词： Nonlinear Systems Time-Varying Systems Multi Layer Perceptron Radial Basis Function Gradient Descent Genetic Algorithms Optimization

Improved sliding-mode control for tracking global maximum power of triple-series-parallel ladder photovoltaic arrays under uneven shadowing

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Clean Energy 2024年第5期8卷 54-72页

作者： Rama Koteswara Rao Alla Kandipati Rajani Ravindranath Tagore Yadlapalli EEE Department RVR&JC College of EngineeringGunturAndhra Pradesh-522019India EEE Department Vignan’s Lara Institute of Technology&ScienceGunturAndhra Pradesh-522213India

This paper presents an innovative way to enhance the performance of photovoltaic(PV)arrays under uneven shadowing *** study focuses on a triple-series–parallel ladder configuration to exploit the benefits of increased power generation while ad-dressing the challenges associated with uneven *** proposed methodology focuses on the implementation of improved sliding-mode control technique for efficient global maximum power point ***-mode control is known for its robustness in the presence of uncertainties and disturbances,making it suitable for dynamic and complex systems such as PV *** work employs a comprehensive simulation framework to comment on the performance of the suggested improved sliding-mode control strategy in uneven shadowing *** analysis has been done to show the better effectiveness of the suggested method than the traditional control *** results demonstrate a remarkable enhancement in the tracking accuracy of the global maximum power point,leading to enhanced energy-harvesting capabilities under challenging environmental ***,the proposed approach exhibits robustness and adaptability in mitigating the effect of shading on the PV array,thereby increasing overall system *** research contributes valuable insights into the development of advanced control strategies for PV arrays,particularly in the context of triple-series–parallel ladder configurations operating under uneven shadowing *** short narrow shading conditions,the improved sliding-mode control method tracks the maximum power better compared with perturb&observe at 20.68%,incremental-conductance at 68.78%,fuzzy incremental-conductance at 19.8%,and constant-velocity sliding-mode control at 1.25%.The improved sliding-mode control method has 60%less chattering than constant-velocity sliding-mode control under shading conditions.

关键词： improved sliding-mode control PV array global maximum power point series-parallel boost converter

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西雅图的亚洲风

建筑实践 2008年第6期 14-19页

作者：邵筱 lara Swimmer

在西雅图旅游时,很多人会想去唐人街看看,如果你问当地人哪里是唐人街,多半会碰钉子,因为唐人街的官方名字不称为唐人街(Chinatown),而是称为国际区(International district)。为了这个名字,唐人街的商户跟政府当局抗议了很久,结果还是... 详细信息

在西雅图旅游时,很多人会想去唐人街看看,如果你问当地人哪里是唐人街,多半会碰钉子,因为唐人街的官方名字不称为唐人街(Chinatown),而是称为国际区(International district)。为了这个名字,唐人街的商户跟政府当局抗议了很久,结果还是不了了之。政

关键词：建筑师唐人街商户名字表皮美术家皮肤美国西雅图博物馆设计亚洲风

Lyapunov-Based Dynamic Neural Network for Adaptive Control of Complex Systems

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Journal of Software Engineering and Applications 2012年第4期5卷 225-248页

作者： Farouk Zouari Kamel Ben Saad Mohamed Benrejeb Unité de Recherche lara Automatique Ecole Nationale d’Ingénieurs de Tunis (ENIT) Tunis Tunisia Unité de Recherche lara Automatique Ecole Nationale d’Ingénieurs de Tunis (ENIT) Tunis Tunisia.

In this paper, an adaptive neuro-control structure for complex dynamic system is proposed. A recurrent Neural Network is trained-off-line to learn the inverse dynamics of the system from the observation of the input-output data. The direct adaptive approach is performed after the training process is achieved. A lyapunov-Base training algorithm is proposed and used to adjust on-line the network weights so that the neural model output follows the desired one. The simulation results obtained verify the effectiveness of the proposed control method.

关键词： Complex Dynamical Systems Lyapunov Approach Recurrent Neural Networks Adaptive Control

Adaptive Internal Model Control of a DC Motor Drive System Using Dynamic Neural Network

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Journal of Software Engineering and Applications 2012年第3期5卷 168-189页

作者： Farouk Zouari Kamel Ben Saad Mohamed Benrejeb Unité de Recherche lara Automatique Ecole Nationale d'Ingénieurs de Tunis (ENIT) Tunis Tunisia.

This work concerns the study of problems relating to the adaptive internal model control of DC motor in both cases conventional and neural. The most important aspects of design building blocks of adaptive internal model control are the choice of architectures, learning algorithms, and examples of learning. The choice of parametric adaptation algorithm for updating elements of the conventional adaptive internal model control shows limitations. To overcome these limitations, we chose the architectures of neural networks deduced from the conventional models and the Levenberg-marquardt during the adjustment of system parameters of the adaptive neural internal model control. The results of this latest control showed compensation for disturbance, good trajectory tracking performance and system stability.

关键词： Adaptive Internal Model Control Recurrent Neural Network DC Motor Parametric Adaptation Algorithm Levenberg-Marquardt

Morphometric Comparison of White Tambaqui （Piaractus brachypomus） in Lentic and Lotic Environments

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Journal of Environmental Science and Engineering(A) 2013年第8期2卷 520-522页

作者： Danny Villegas Rivas Tonny Garcia Rujano Agriculrural Science Program and Sea UNELLEZ Guanare Portuguesa 3350 Venezuela Decanate of Agronomy UCLA Barquisimeto Lara 3023 Venezuela

The purpose of this paper is looking for associations between environmental factors and morphological parameters in tambaqui （Piaractus brachypomus） individuals to differentiate this species in lentic environments （lake） and lotic （river）. In this, regard studied 30 specimens, 15 from lentic environment （lake） and 15 from lotic （river）. Also, on right profile of these 25 morphometric variables were measured. On data matrix a PCA （principal components analysis） based on morphometric correlations matrix, which was defined in the new morphologic space of these specimens （3 principal components） which explain 73.23% of variability. Fish projection in first two principal components showed a morphological differentiation between two environments （lentic and lotic）, with variables as, horizontal eye diameter, length maxilla, suggesting greater response of these fish in lotic environment by their adaptation to light conditions, predators threat and food distribution. Finally, in lotic environment these fish have thinner caudal peduncle, indicating greater plasticity, namely stylized fish.

关键词： Morphometric comparison tambaqui environments and principal components.