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Parameter Estimation of Thrust Models of Uninhabited Airborne systems

IFAC Proceedings Volumes 2010年第16期43卷 354-359页

作者： Tristan Perez Pierre de Lamberterie Alejandro Donaire Elias Revestido Herrero School of Engineering Discipline of Mechanics and Mechatronics The University of Newcastle Callaghan NSW 2308 AUSTRALIA Centre for Complex Dynamic Systems and Control (CDSC) The University of Newcastle Callaghan NSW 2308 AUSTRALIA Dept. of Electronic Technology Systems Engineering and Automatic Control The University of Cantabria Spain

This paper presents a method for the estimation of thrust model parameters of uninhabited airborne systems using specific flight tests. Particular tests are proposed to simplify the estimation. The proposed estimation method is based on three steps. The first step uses a regression model in which the thrust is assumed constant. This allows us to obtain biased initial estimates of the aerodynamic coefficients of the surge model. In the second step, a robust nonlinear state estimator is implemented using the initial parameter estimates, and the model is augmented by considering the thrust as random walk. In the third step, the estimate of the thrust obtained by the observer is used to fit a polynomial model in terms of the propeller advanced ratio. We consider a numerical example based on Monte-Carlo simulations to quantify the sampling properties of the proposed estimator given realistic flight conditions.

关键词： Aerospace aircraft nonlinear filtering least squares parameter estimation regression unscented Kalman filters

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Damping Structure Selection in Nonlinear Ship Manoeuvring Models

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IFAC Proceedings Volumes 2010年第20期43卷 73-78页

作者： Tristan Perez Elías Revestido-Herrero School of Engineering Discipline of Mechanics and Mechatronics The University of Newcastle Callaghan NSW 2308 AUSTRALIA Centre for Ships and Ocean Structures (CeSOS) Norwegian University of Science and Technology (NTNU) Trondheim NORWAY Dept. of Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

This paper presents the application of a statistical method for model structure selection of lift-drag and viscous damping components in ship manoeuvring models. The damping model is posed as a family of linear stochastic models, which is postulated based on previous work in the literature. Then a nested test of hypothesis problem is considered. The testing reduces to a recursive comparison of two competing models, for which optimal tests in the Neyman sense exist. The method yields a preferred model structure and its initial parameter estimates. Alternatively, the method can give a reduced set of likely models. Using simulated data we study how the selection method performs when there is both uncorrelated and correlated noise in the measurements. The first case is related to instrumentation noise, whereas the second case is related to spurious wave-induced motion often present during sea trials. We then consider the model structure selection of a modern high-speed trimaran ferry from full scale trial data.

关键词： System Identification Regression Analysis Ship Dynamics Hypothesis Testing

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control communications with DDS using IEC61499 Service Interface Function Blocks

Control communications with DDS using IEC61499 Service Inter...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Isidro Calvo Federico Pérez Ismael Etxeberria Guadalupe Morán Dept. of Automatic Control and Systems Engineering University of the Basque Country (UPV/EHU) Spain Dept. of Computer Languages and Systems University of the Basque Country (UPV/EHU) Spain Electronics Division Faculty of Engineering Universidad Autónoma del Estado de Mexico Toluca Mexico Electronics Division Faculty of Engineering UAEM Toluca MEXICO

The IEC61499 is an open standard for distributed control and automation. The interface between control software and hardware or communications is achieved by means of the so-called Service Interface Function Blocks (SIFB). This paper presents the guidelines to build communication SIFBs based on the emerging OMG DDS (Data Distribution Service) middleware. This specification implements in a very efficient way the Publisher/Subscriber paradigm providing significant QoS configuration possibilities. These characteristics make DDS suitable for implementing the communications among time-critical devices. By using these DDS-SIFBs within IEC61499 code generation tools, the designers of the distributed applications will be allowed to use this powerful technology in the new distributed applications.

关键词： IEC standards Middleware Hardware Quality of service Distributed control Software Process control

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An integrated multifunction DC/DC converter for PV generation systems

An integrated multifunction DC/DC converter for PV generatio...

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IEEE International Symposium on Industrial electronics (ISIE)

作者： Lin Ma Kai Sun Remus Teodorescu Josep M. Guerrero Xinmin Jin Department of Energy Technology Aalborg University Aalborg Denmark School of Electrical Engineering Beijing Jiao Tong University Beijing China State Key Lab of Power Systems Tsinghua University Beijing China Dept. of Automatic Control Systems and Computer Engineering Universitat Politecnica de Catalunya Barcelona Spain

Due to the stochastic characteristic of photovoltaic (PV) generation, energy storage devices are indispensable to smooth the power flow and provide the electric energy with high quality. In this paper, an integrated DC/DC converter is proposed to realize high performance interfaces for PV array, battery and load. This converter consists of a boost converter for the PV array and a buck/boost converter for the battery, which can realize multifunction including power generation, charge and discharge. The grid-connected and stand-alone operation modes of this converter are analyzed. From this analysis, the control strategies are developed for both modes. A coordination scheme is proposed for the power balance at the stand-alone mode. Simulation and experiments verify the practical feasibility and effectiveness of this multi-function converter.

关键词： Batteries Arrays DC-DC power converters Voltage control Inverters Load flow

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Robust model predictive control of continuous-time sampled-data nonlinear systems with integral sliding mode 10

Robust model predictive control of continuous-time sampled-d...

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2009 10th European control Conference, ECC 2009

作者： Rubagotti, M. Raimondo, D.M. Ferrara, A. Magni, L. Dept. of Computer Engineering and Systems Science University of Pavia Via Ferrata 1 Pavia27100 Italy Automatic Control Laboratory Swiss Federal Institute of Technology Physikstrasse 3 Zürich8092 Switzerland

ISBN: (纸本)9783952417393

A hierarchical Nonlinear Model Predictive control (NMPC) scheme with guaranteed Input-to-State-practical-Stability (ISpS) is proposed. The controller is formed by an Integral Sliding Mode (ISM) controller and a NMPC one. The ISM, relying on the knowledge of the nominal continuous-time model of the system and of the piecewise constant control signal generated by the NMPC produces a control action aimed at reducing the difference between the dynamics of the nominal closed-loop system and the actual evolution of the state. The NMPC in this way can be designed based on a system with reduced uncertainty. In order to prove the stability of the overall control scheme, some general Regional ISpS results for continuous-time systems are proven. © 2009 EUCA.

关键词： Continuous time systems

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A Simulation Study of Consensus Speed over Scale-Free Networks

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IFAC Proceedings Volumes 2009年第22期42卷 74-79页

作者： Wei Sun YangQuan Chen Dept. of Automatic Control Beijing Institute of Technology Beijing 100081 China Center for Self-Organizing and Intelligent Systems (CSOIS) Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322 USA

Scale-free network and consensus among multiple agents have both drawn quite much attention. To investigate the consensus speed over scale-free networks is the main topic in this paper. Given a set of different values for the power-law distribution parameter γ, and a set of different values for the minimum degree ( d min ) for the nodes, the algebraic connectivity (λ 2 ) of the network topology is studied, as well as the time ( t c ) (or iteration ( k c ), for discrete algorithm) taken to reach consensus. The results exhibit that λ 2 decreases while γ increases. The λ 2 increases monotonically as d min grows, and they fit very well in a linear relationship. t c (or k c ) decreases as γ reduces and d min increases. Via observing the behavior of the largest eigenvalue (λ n ) of the Laplacian of the network topology, we draw the conclusion that the robustness over time delays declines while the robustness over node-failures and edge-failures increases.

关键词： Scale-free network consensus algebraic connectivity network robustness

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Robust Model Predictive control of continuous-time sampled-data nonlinear systems with Integral Sliding Mode

Robust Model Predictive Control of continuous-time sampled-d...

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European control Conference (ECC)

作者： M. Rubagotti D.M. Raimondo A. Ferrara L. Magni Dept. of Computer Engineering and Systems Science University of Pavia Pavia Italy Automatic Control Laboratory Swiss Federal Institute of Technology Zürich Switzerland

关键词： Robustness Closed loop systems Uncertainty Stability analysis Economic indicators Manifolds Predictive control

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Extraction of fet al ECG signal via adaptive noise cancellation approach

Extraction of fet al ECG signal via adaptive noise cancellat...

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2nd International Conference on Bioinformatics and Biomedical engineering, iCBBE 2008

作者： Zeng, Yanjun Liu, Shijin Zhang, Jianhua Beijing University of Technology Beijing 100022 China Dept. of Mechanics and Electronics Engineering Hubei Professional College of Land Resource Hubei 434002 China Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD United Kingdom

ISBN: (纸本)9781424417483

The non-invasive fet al Electrocardiogram (FECG) can provide reliable information about the fetus'state. The original FECG signal is nevertheless very complex and severely contaminated by external disturbances or noises. It is very hard, even not impossible, to reliably extract the FECG from the abdominal signal using traditional techniques. In this work the recursive least squares (RLS) based adaptive noise canceling (ANC) approach is applied to eliminate the maternal ECG (MECG) and hence to extract the FECG. The experimental results have demonstrated that the developed ANC approach can speed up convergence of the normalized least mean squares (NLMS) algorithm and is able to track non-stationary FECG signal in an adaptive manner.

关键词： Electrocardiograms

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New adaptive quasi-sliding mode control for nonlinear discrete-time systems

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Journal of systems engineering and electronics 2008年第1期19卷 154-160页

作者： Wang Weihong1,2 & Hou Zhongsheng3 1. School of Tra?c and Transportation, Beijing Jiaotong Univ., Beijing 100044, P. R. China 2. dept. of Automation, Taiyuan Univ. of Science & technology, Taiyuan 030024, P. R. China 3. Advanced control systems Lab, School of electronics and Information engineering, Beijing Jiaotong Univ., Beijing 100044, P. R. China School of Traffic and Transportation Beijing Jiaotong Univ. Beijing 100044 P. R. China Dept. of Automation Taiyuan Univ. of Science & Technology Taiyuan 030024 P. R. China Advanced Control Systems Lab School of Electronics and Information Engineering Beijing Jiaotong Univ. Beijing 100044 P. R. China

A new adaptive quasi-sliding mode control algorithm is developed for a class of nonlinear discrete-time systems, which is especially useful for nonlinear systems with vaguely known dynamics. This design is model-free, and is based directly on pseudo-partial-derivatives derived on-line from the input and output information of the system using an improved recursive projection type of identification algorithm. The theoretical analysis and simulation results show that the adaptive quasi-sliding mode control system is stable and convergent.

关键词： quasi-sliding mode control adaptive control model-free control pseudo-partial-derivative

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Minimisation of harmonics amplification due to resonance by relocation of capacitors using ADALINE on a DSP

Minimisation of harmonics amplification due to resonance by ...

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International Conference on Computing, Communication and Networking, ICCCN

作者： K.R. Valluvan A. Vetrivel A.M. Natarajan Jovitha Jerome Department of Information Technology Kongu Engineering College Erode India Department of Electrical and Electronics Engineering Institute of Road and Transport Technology Erode India Dept. of Electronics & Communication Engineering Bannari Amman Institute of Technology Sathyamangalam India Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore India

Nonlinear loads produce current harmonics. The harmonic current flowing through the nonzero impedance of the electrical network, produce harmonics in supply voltage. Harmonics in power systems cause many ill effects and economic losses. To minimise the losses, IEEE: 519- 1992 has specified limits on voltage and current harmonics. Inductive loads like induction motors produce lagging power factor of less than unity. Capacitors are often used to improve the power factor by adding them in shunt with inductive loads. When high frequency harmonic currents flow through the network, due to the combination of inductive and capacitive loads (which are linear), resonance occurs. This causes an amplification of harmonics. Consequently, the increased harmonics affect the linear loads and produce more losses. This paper explains the results of harmonics measurements by a class of neural network, ADALINE implemented on a digital signal processor. Measurements were carried out when capacitors were grouped in one place and after their relocation nearer to the linear loads. The results show that, relocation of capacitors have minimised both voltage and current harmonics significantly. This methodology is very economical since it does not require any additional equipment for filtering of harmonics.

关键词： Resonance Capacitors Digital signal processing Power system harmonics Power harmonic filters Voltage Power generation economics Reactive power Impedance Power system economics

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