检索结果-南通市图书馆

Aircraft Fault Tolerant Control Based on Active Set Method

在线全文

学校读者我要写书评

暂无评论

Aircraft Fault Tolerant Control Based on Active Set Method

第25届中国控制与决策会议

作者： Lunlong Zhong Félix Mora-Camino enac MAIAA Univ de Toulouse

ISBN: (纸本)9781467355339

This communication considers the case in which an aerodynamic actuator failure occurs to an aircraft while it has to perform a guidance manoeuver. The problem considered deals with the reassignment of the remaining actuators to continue to perform the manoeuver while maintaining the structural integrity of the aircraft. A nonlinear inverse control technique is used to generate online nominal moments along the three main axes of the aircraft. Then, taking into account all material and structural constraints as well as the redundant effects from other actuators, a Mathematical Programming problem to be solved online is introduced. The proposed on line solution method is based on an active set method which appears to provide acceptable response times according to the simulation results. Then new development perspectives are discussed.

关键词： Fault tolerant control Flight mechanics Quadratic programming Active set method Actuators assignment

A Methodology to Predict Fatigue Life of Cast Iron:Uniform Material Law for Cast Iron

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第8期18卷 42-45页

作者： Sinan Korkmaz Applied Computing and Mechanics Laboratory Swiss Federal Institute of Technology(EPFL)ENAC/IIC/IMAC

Mechanical, physical and manufacturing properties of east iron make it attractive for many fields of application, such as cranks and cylinder holds. As in design of all metals, fatigue life prediction is an intrinsic part of the design process of structural sections that are made of cast iron. A methodology to predict high-cycle fatigue life of cast iron is proposed. Stress amplitude-strain amplitude, strain amplitude-number of loading cycles relationships of cast iron are investigated. Also, fatigue life prediction in terms of Smith, Watson and Topper parameter is carried out using the proposed method. Results indicate that the analytical outcomes of the proposed methodology are in good accordance with the experimental data for the two studied types of cast iron： EN-GJS-400 and EN-GJS-600.

关键词： high-cycle fatigue fatigue behavior fatigue life prediction cast iron

A two-stage approach for managing actuators redundancy and its application to fault tolerant flight control

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2015年第2期28卷 469-477页

作者： Zhong Lunlong Félix Mora-Camino Tianjin Key Laboratory for Advanced Signal and Image Processing Civil Aviation University of China Automation Research Group of MAIAA ENAC Toulouse University

In safety-critical systems such as transportation aircraft, redundancy of actuators is introduced to improve fault tolerance. How to make the best use of remaining actuators to allow the system to continue achieving a desired operation in the presence of some actuators failures is the main subject of this paper. Considering that many dynamical systems, including flight dynamics of a transportation aircraft, can be expressed as an input affine nonlinear system, a new state repre- sentation is adopted here where the output dynamics are related with virtual inputs associated with the intended operation. This representation, as well as the distribution matrix associated with the effectiveness of the remaining operational actuators, allows us to define different levels of fault tol- erant governability with respect to actuators＇ failures. Then, a two-stage control approach is devel- oped, leading frst to the inversion of the output dynamics to get nominal values for the virtual inputs and then to the solution of a linear quadratic （LQ） problem to compute the solicitation of each operational actuator. The proposed approach is applied to the control of a transportation air- craft which performs a stabilized roll maneuver while a partial failure appears. Two fault scenarios are considered and the resulting performance of the proposed approach is displayed and discussed.

关键词： Actuator allocation Fault tolerant control Flight control Linear quadratic (LQ)problem Nonlinear control

Hamilton-Jacobi-Bellman equations for Fuzzy-Dual Optimization 36

在线全文

学校读者我要写书评

暂无评论

Hamilton-Jacobi-Bellman equations for Fuzzy-Dual Optimizatio...

第36届中国控制会议

作者： Lunlong Zhong Felix Mora-Camino Hakim Bouadi Roger Marcelin Faye Key Lab. for Adv.Signal Proc. Civil Aviation University of China Automation Research Group ENACToulouse University

ISBN: (纸本)9781538629185

In this article, after introducing fuzzy-dual numbers, functions and functionals, the optimization of a fuzy-dual functional is considered through an extension of Euler’s condition. Then, once uncertainty is imbedded in a fuzzy-dual dynamical system, the optimization of such systems is considered, leading to an extended Hamilton-Jacobi-Bellman equation to characterize optimal fuzzy-dual solutions.

关键词： fuzzy-dual numbers uncertain systems Euler’s equation optimal control Hamilton-Jacobi-Bellman equation

Piezoelectric resonant ice protection systems-Part 2/2:Evaluation of benefits at aircraft level

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第6期37卷 50-63页

作者： Valerian PALANQUE Thomas PLANES Pommier-Budinger VALERIE Budinger MARC Delbecq SCOTT Institut Clement Ader(ICA) INSAISAE-SUPAEROMINES ALBIUPSCNRSUniversity of Toulouse31400 ToulouseFrance Federation enac ISAE-SUPAERO ONERA University of Toulouse31400 ToulouseFrance

Piezoelectric resonant de-icing systems are attracting great *** paper aims to assess the implementation of these systems at the aircraft *** article begins with the model to compute the power requirement of a piezoelectric resonant de-icing system sized from the prototype detailed in Part 1/2 of this *** the mass,drag,and fuel consumption of this system and the subcomponents needed for its implementation are *** features of a piezoelectric resonant de-icing system are finally computed for aircraft similar to Airbus A320 aircraft and aircraft of different categories(Boeing 787,ATR 72 and TBM 900)and compared with the existing thermal and mechanical ice protection systems.A sensitivity analysis of the main key sizing parameters of the piezoelectric de-icing system is also performed to identify the main axes of improvement for this *** study shows the potential of such ice protection *** particular,for the realistic input parameters chosen in this work,the electro-mechanical solution can provide a 54% reduction in terms of mass and a 92% reduction in terms of power consumption for an A320 aircraft architecture,leading to a 74% decrease in the associated fuel consumption compared to the actual air bleed system.

关键词： Ice protection system De-icing Piezoelectric Electro-mechanical system Power Fuel consumption

A Two Level Non Linear Inverse Control Structure for Rotorcraft Trajectory Tracking

在线全文

学校读者我要写书评

暂无评论

A Two Level Non Linear Inverse Control Structure for Rotorcr...

第二十六届中国控制会议

作者： Mora-Camino Félix LARA enac 31055 ToulouseFrance

The purpose of this communication is to investigate the usefulness of the non linear inverse control approach to solve the trajectory tracking problem for a four rotor *** introducing simplifying assumptions,the flight dynamics equations for the four rotor aircraft are considered.A trajectory tracking control structure based on a two layer non linear inverse approach is then proposed.A supervision level is introduced to take into account the actuator limitations.

关键词： Rotorcraft flight mechanics nonlinear inverse control trajectory tracking.

VETA:Visual eye-tracking analytics for the exploration of gaze patterns and behaviours

在线全文

cnki会议

学校读者我要写书评

暂无评论

Visual Informatics 2022年第2期6卷 1-13页

作者： Sarah Goodwin Arnaud Prouzeau Ryan Whitelock-Jones Christophe Hurter Lee Lawrence Umair Afzal Tim Dwyer Monash University ClaytonAustralia Inria&LaBRI(University of Bordeaux CNRSBordeaux-INP)BordeauxFrance enac UniversitédeToulouseToulouseFrance Swinburne University of Technology MelbourneAustralia

Eye tracking is growing in popularity for multiple application areas,yet analysing and exploring the large volume of complex data remains difficult for most *** present a comprehensive eye tracking visual analytics system to enable the exploration and presentation of eye-tracking data across time and space in an efficient *** application allows the user to gain an overview of general patterns and perform deep visual analysis of local gaze *** ability to link directly to the video of the underlying scene allows the visualisation insights to be verified on the *** system was motivated by the need to analyse eye-tracking data collected from an‘in the wild’study with energy network operators and has been further evaluated via interviews with 14 eye-tracking experts in multiple *** suggest that,thanks to state-of-the-art visualisation techniques and by providing context with videos,our system could enable an improved analysis of eye-tracking data through interactive exploration,facilitating comparison between different participants or conditions,thus enhancing the presentation of complex data analysis to *** research paper provides four contributions:(1)analysis of a motivational use case demonstrating the need for rich visual-analytics workflow tools for eye-tracking data;(2)a highly dynamic system to visually explore and present complex eye-tracking data;(3)insights from our applied use case evaluation and interviews with experienced users demonstrating the potential for the system and visual analytics for the wider eye-tracking community.

关键词： Eye tracking Visual analytics Spatial-temporal visualisation

Hydrothermal interactions in energy walls

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2021年第2期6卷 173-184页

作者： Jacopo Zannin Alessio Ferrari Maxime Pousse Lyesse Laloui Swiss Federal Institute of Technology in Lausanne EPFLLaboratory of Soil MechanicsEPFL-ENAC-IIC-LMSStation 181015 LausanneSwitzerland Nobatek/INEF4 67 rue de MirambeauF-64600 AngletFrance

Energy geostructures(EGs)employ heat exchangers embedded in concrete geostructures,such as piles,walls,tunnels,and *** this study,energy walls(EWs)are studied with an emphasis on the following objectives:(1)to understand the fundamentals of hydrothermal interactions acting in the vicinity of EWs caused by groundwater seepage in saturated soil;(2)to highlight hydraulically induced thermal effects and their consequences on the thermal performance of *** three-dimensional hydrothermal finite element analyses are performed considering two groundwater flow conditions:perpendicular and parallel to the *** thermal activation of the geostructure locally modifies the flownet with respect to the non-isothermal case because of the temperature dependency of the water *** interactions between seepage directions and thermal activation are *** thermal interactions are detected within the heat *** thermal behavior of EGs is highly affected by an incorrect evaluation of the hydraulically induced thermal effects,which may result in an overestimation of the thermal ***,an efficient thermal design,which considers such interactions,may increase the thermal potential of EGs.

关键词： Geothermal energy Shallow geothermal structures Energy geostructures Energy infrastructures Hydrothermal modelling Non-isothermal seepage Hydrothermal interactions

Dynamic Programming for Trajectory Optimization of Engine-out Transportation Aircraft

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Dynamic Programming for Trajectory Optimization of Engine-ou...

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