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SSRN 2022年

作者： Nikolaidis, Theoklis Jafari, Soheil Sibilli, Thierry Kipouros, Timoleon Ayat, Sabrina Isikveren, Askin Centre for Propulsion and Thermal Power Engineering Cranfield University BedfordMK43 0AL United Kingdom Airbus Operations GmbH Kreetslag 10 HamburgD-21129 Germany Formerly Company Expert on Thermal Systems SAFRAN Tech Safran Paris Saclay France SAFRAN Paris Saclay Châteaufort CS 80112 Magny-les-Hameaux78772 France SAFRAN S.A. c/o Aerospace Embedded Solutions GmbH Munich80639 Germany Reader in Gas Turbine Performance and Numerical Simulation Centre for Propulsion Engineering and Power United Kingdom Lecturer in Gas Turbine Thermal Management and Control Centre for Propulsion Engineering and Power United Kingdom Hydrogen Fuel System Development Engineer Airbus Operations GmbH Kreetslag 10 HamburgD-21129 Germany Formerly Company Expert on Thermal Systems SAFRAN Tech Safran Paris France Senior Lecturer in Computational Engineering Design Optimisation Centre for Propulsion Engineering and Power United Kingdom Research Engineer Electrical & Electronic Systems Group Safran Tech SAFRAN Paris Saclay France Advanced Aircraft Concepts and Energy Systems Senior Group Expert Integrated Aircraft Systems and Operations SAFRAN Tech France

New generation of propulsion systems are increasingly complex with higher requirements on engines for efficiency, thrust and power generation. As a side effect, the produced thermal loads are higher, imposing limitations on the air vehicle performance. The current paper offers a novel methodology for thermal management system architecture design for high power hybrid electric propulsion systems. Four cases are investigated including state-of-the-art conventional thermal management system, pre-heated two-phase thermal management system, utilizing thermally neutral heat transfer fluids in a two-phase cooling mechanism, and a combination of single- and two-phase thermal management system architectures. For this purpose, a Vertical Take-Off and Landing multi-mission aircraft is selected as the case study in which the existing mechanically driven lift fan is replaced by an electric fan to replicate a high-power hybrid electric propulsion system of the future generation. The results confirm that the performance of the pre-heated two-phase thermal management system surpasses the other cases without exceeding the temperature limit. On the contrary, the state-of-the-art conventional system can operate only for 70 seconds. So, the results confirm the effectiveness of the proposed thermal management system architecture in dealing with MW scale thermal loads generated by next generation high power hybrid electric propulsion systems. © 2022, The Authors. All rights reserved.

关键词： Temperature control

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RETRACTED ARTICLE: Singular vs. non-singular memorised relaxation for basic relaxation current of the capacitor

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Pramana 2019年第1期93卷 1-11页

作者： Shantanu Das Reactor Control Systems Design Section Electronics and Instrumentation Group Bhabha Atomic Research Centre Mumbai India Condensed Matter Physics Research Centre Department of Physics Jadavpur University Kolkata India

We express the basic relaxation current of capacitor dynamics by using convolution operation of memory kernal function (that we choose as singular and non-singular) with rate of change of...

We express the basic relaxation current of capacitor dynamics by using convolution operation of memory kernal function (that we choose as singular and non-singular) with rate of change of applied voltage. We have studied singular and non-singular types of memory kernels in this convolution expression. With these, we form constitutive equations for capacitor dynamics. We conclude that, mathematically, we can use the non-singular kernel now although this does not give much useful practically or physically realisable results and interpretations. It may be that we are unable to interpret these constitutive expressions of capacitor relaxation with non-singular memory kernel. Therefore, we have a question: Do natural relaxation dynamics for dielectrics have a singular memory kernel and is the relaxation current function singular in nature? Is the singular relaxation function for capacitor dynamics with singular memory kernel remains the universal law for dielectric relaxation? However, we are not questioning the researchers modelling the relaxation of dielectric via non-singular functions, but we are hinting about the complexity of basic constituent equation of the capacitor dynamics thus obtained by considering non-singular relaxations.

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Pole placement enhancement of a constrained greenhouse SISO system

Pole placement enhancement of a constrained greenhouse SISO ...

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Innovative research in Applied Science, Engineering and Technology (IRASET),Conference on

作者： H. Hamidane S. Elfaiz M. Guerbaoui A. Ed-dahhak A. Lachhab B. Bouchikhi Department of Electrical Engineering Modelling Systems Control and Telecommunications Team Moulay Ismaïl University Meknes Morocco Research team on Energy and Sustainable Development Ibn Zohr University Guelmim Morocco Department of Physics Sensor Electronic and Instrumentation Group Moulay Ismaïl University Meknes Morocco

ISBN: (数字)9781728149790

ISBN: (纸本)9781728149806

In this paper, we present an application of a pole placement technique related to the stability analysis for a linear constrained system. In this regard some of the main approaches that have been used in the last decades dealing with the pole placement will be engaged. Concepts and methods involved in this work include positive invariance as an efficient notion for the pole placement amelioration of a modern SISO system. The state feedback will enhance the stability of the closed loop system under the notion of constrained control. For this aim, a greenhouse system, is engaged and a linear discrete time state space model, which fits properly the acquired data of the greenhouse, was identified by the mean of the subspace system identification (N4sid) algorithm. The obtained model will be used in order to develop and calculate the state feedback gain based on the so-called Sylvester algebric equation and one of the pole placement techniques algorithm to ameliorate the closedloop pole placement of the system with constraints on the control.

关键词： Mathematical model Stability analysis control systems Temperature measurement Eigenvalues and eigenfunctions Green products Aerospace electronics

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Sliding Mode control of Time-Delay systems with Delayed Nonlinear Uncertainties

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IFAC-PapersOnLine 2017年第1期50卷 2696-2701页

作者： Onyeka A.E. Yan X.-G. Mu J. Instrumentation Control and Embedded systems Research Group School of Engineering and Digital Arts University of Kent Canterbury CT2 7NT United Kingdom

This paper considers a class of time delay systems with delayed states and nonlinear uncertainties using sliding mode techniques. In order to improve robustness, matched and mismatched disturbances are considered and assumed to be nonlinear functions of system states and delayed states. A sliding function is designed and a set of sufficient conditions is derived to guarantee the stability of the corresponding sliding motion by using Lyapunov-Razumikhin approach which allows large time varying delay with fast changing rate. A delay dependent sliding mode control is synthesized to drive the system to the sliding surface in finite time and maintain a sliding motion thereafter. Effectiveness of the proposed method is tested via a case study on a continuous stirred tank reactor system. © 2017

关键词： Lyapunov-Razumikhin approach Sliding mode control Time delay Uncertain systems

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A novel frequency domain maximum likelihood approach for estimating transport coefficients in cylindrical geometry for nuclear fusion devices

A novel frequency domain maximum likelihood approach for est...

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IEEE Annual Conference on Decision and control

作者： Matthijs van Berkel Gerardus W. Oosterwegel Martijn Anthonissen Hans J. Zwart Gerd Vandersteen DIFFER-Dutch Institute for Fundamental Energy Research Energy Systems and Control group Eindhoven The Netherlands Dept. of Mathematics and Computer Science Eindhoven University of Technology Eindhoven The Netherlands Dept. of Mechanical Engineering Eindhoven University of Technology Eindhoven The Netherlands Dept. of Fundamental Electricity and Instrumentation Vrije Universiteit Brussel (VUB) Brussels Belgium

ISBN: (数字)9781728113982

ISBN: (纸本)9781728113999

This paper introduces a novel maximum likelihood approach to determine the local thermal transport coefficients belonging to diffusion and convection from excitation (perturbative) transport experiments. It extends previous work developed for linear (slab) geometry to cylindrical (toroidal) geometry for fusion reactors. The previous linear geometry approach is based on analytic solutions of the partial differential equation. However, for cylindrical geometries with convection the analytic solutions are confluent hypergeometric functions (CHFs) with complex valued arguments. Most numerical libraries do not support CHFs evaluation with complex valued arguments. Hence, this paper proposes the use of an ultra-fast transfer function evaluation based on sparse numerical solutions for the discretized partial differential equation. This solution is implemented in MATLAB and incorporated in the frequency domain Maximum Likelihood Estimation framework. Consequently, transport coefficients can be estimated consistently when measurements are perturbed by coloured and spatially correlated noise.

关键词： Fusion reactors Geometry Maximum likelihood estimation Temperature sensors Partial differential equations Frequency-domain analysis

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Adaptive Observer Design for a Class of Nonlinear Interconnected systems with Uncertain Time Varying Parameters

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IFAC-PapersOnLine 2017年第1期50卷 1421-1426页

作者： Mohamed M. Yan X.-G. Mao Z. Jiang B. Instrumentation Control and Embedded Systems Research Group School of Engineering & Digital Arts University of Kent Canterbury CT2 7NT United Kingdom College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 China

In this paper, a class of nonlinear interconnected systems with uncertain time varying parameters is considered, in which both the interconnections and the isolated subsystems are nonlinear. The difference between the unknown time varying parameter and its corresponding nominal value is assumed to be bounded where the nominal value is not required to be known. A dynamical system is proposed and then, the error systems between the original interconnected system and the designed dynamical systems are analysed based on the Lyapunov direct method. A set of conditions is developed such that the augmented systems formed by the error dynamical systems and the designed adaptive laws, are globally uniformly bounded. Specifically, the estimation errors are asymptotically convergent to zero using LaSalle-Yoshizawa Theorem. Case study on a coupled inverted pendulum system is presented to demonstrate the developed methodology, and simulation shows that the proposed approach is effective and practicable. © 2017

关键词： Adaptive Observers Lyapunov Direct Method Nonlinear Interconnected systems Time Varying Parameters

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Decentralised Sliding Mode control for Nonlinear Interconnected systems in the Generalised Regular Form

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IFAC-PapersOnLine 2017年第1期50卷 8850-8855页

作者： Mu J. Yan X.-G. Zhang Q. Mao Z. Instrumentation Control and Embedded Systems Research Group School of Engineering & Digital Arts University of Kent Canterbury CT2 7NT United Kingdom Institute of Systems Science Northeastern University Shenyang Liaoning 110819 China Colledge of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 China

In this paper, a decentralised control strategy based on sliding mode techniques is proposed for a class of nonlinear interconnected systems in generalised regular form. All the isolated subsystems and interconnections are fully nonlinear. It is not required that the nominal isolated subsystems are either linearizable or partially linearizable. The uncertainties are nonlinear and bounded by known functions. Under mild conditions, sliding mode controllers for each subsystem are designed by only employing local information. Sufficient conditions are developed under which information on the interconnections is employed for decentralised controller design to reduce the effects of the interconnections on the entire systems. The bounds on the uncertainties have more general forms compared with previous work. A simulation example is used to demonstrate the effectiveness of the proposed method. © 2017

关键词： decentralised control generalised regular form Interconnected system sliding mode control

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Determining the electron transport mechanisms from direct heat flux reconstructions 45

Determining the electron transport mechanisms from direct he...

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45th EPS Conference on Plasma Physics, EPS 2018

作者： Van Berkel, M. Kobayashi, T. Vandersteen, G. Zwart, H.J. Igami, H. Kubo, S. Tamura, N. Tsuchiya, H. De Baar, M.R. 1DIFFER-Dutch Institute for Fundamental Energy Research PO Box 6336 Eindhoven5600HH Netherlands Dept. of Fundamental Electricity and Instrumentation Pleinlaan 2 Brussels1050 Belgium National Institute for Fusion Science 322-6 Oroshi-cho Toki-city Gifu509-5292 Japan Eindhoven University of Technology Dept. of Mechanical Engineering Control Systems Technology Groupn Dynamics and Control Group PO Box 513 Eindhoven5600MB Netherlands University of Twente Dept. of Applied Mathematics PO Box 217 Enschede7500AE Netherlands

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Variable structure observer for a class of nonlinear large-scale interconnected systems with uncertainties

Variable structure observer for a class of nonlinear large-s...

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International Workshop on Variable Structure systems, VSS

作者： Mokhtar Mohamed Xing-Gang Yan Sarah K. Spurgeon Zehui Mao Instrumentation Control and Embedded Systems Research Group University of Kent Canterbury United Kingdom College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China

In this paper, a variable structure observer design approach is proposed for a class of nonlinear, large-scale interconnected systems in the presence of unstructured uncertainty. The modern geometric approach is exploited to explore the system structure and a transformation is developed to facilitate observer design. Using the Lyapunov direct method, a robust asymptotic observer is presented which exploits the internal dynamic structure of the system as well as the structure of the uncertainties. The bounds on the uncertainties are nonlinear and are employed in the observer design to reject the effect of the uncertainties. A numerical example is presented to illustrate the approach and the simulation results show that the proposed approach is effective.

关键词： Observers Interconnected systems Uncertainty Robustness Nonlinear dynamical systems Fault detection Large-scale systems

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Development of Tele-Alarm and Fire Protection system using Remote Terminal Unit for Nuclear Power Plant

Development of Tele-Alarm and Fire Protection system using R...

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2015 International Conference on Robotics, Automation, control and embedded systems, RACE 2015

作者： Behera, Rajendra Prasad Murali, N. Satya Murty, S.A.V. Real Time Systems Division Instrumentation and Control Group Indira Gandhi Centre for Atomic Research Kalpakkam India

ISBN: (纸本)9788192597430

Tele-Alarm and Fire Protection systems are two important echelons of the defense-in-depth approach to achieve a degree of safety necessary in Nuclear Power Plant. Tele-Alarm systems are used to ensure that the operator in every shift performs area surveillance of all the equipment to check their healthiness and identify maintenance requirements. Similarly, Fire Protection systems play a major role in alerting plant operator for implementation of emergency action and are used to actuate fire-extinguishing systems in the incipient stage so as to minimize the fire damage to structures, systems and components. In this paper we present design & development of Tele-Alarm and Fire Protection System using 8051 Micro-controller based Remote Terminal Unit (RTU) for real time monitoring of area surveillance keys, call buttons, detectors used for detection of water logging, oxygen deficiency & fire hazards and generating control outputs for fire extinguisher via commands received from remotely located control room operator in nuclear power plant like Prototype Fast Breeder Reactor (PFBR) being constructed at Kalpakkam. © 2015 Hindustan University.

关键词： Nuclear power plants

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