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Fuzzy auto-associative neural networks for principal component extraction of noisy data

IEEE TRANSACTIONS ON NEURAL NETWORKS 2000年第3期11卷 808-810页

作者： Yang, TN Wang, SD Natl Taiwan Univ Dept Elect Engn Taipei 10764 Taiwan

In this paper, we propose a fuzzy auto-associative neural network for principal component extraction. The objective function is based on reconstructing the inputs from the corresponding outputs of the auto-associative neural network. Unlike the traditional approaches, the proposed criterion is a fuzzy mean squared error, We prove that the proposed objective function is an appropriate fuzzy formulation of auto-associative neural network for principal component extraction. Simulations are given to show the performances of the proposed neural networks in comparison with the existing method.

关键词： auto-associative neural networks fuzzy theory principal component analysis robust algorithm

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algorithm for the Wigner distribution of noisy signals realisation

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ELECTRONICS LETTERS 1998年第7期34卷 622-624页

作者： Stankovic, LJ Ruhr Univ Bochum Signal Theory Grp D-44780 Bochum Germany

A simple robust algorithm which efficiently represents signals with a very high amount of noise is presented, according to the expressions for the mean, variance and the optimal window width of the Wigner distribution... 详细信息

关键词： Wigner distribution Wigner distribution filtering theory interference (signal) noise noisy signals representation robust algorithm signal representation time-varying filtering time-varying filters

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Online assessment of voltage stability using Newton-Corrector algorithm

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IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第19期14卷 4207-4216页

作者： Ali, Mazhar Gryazina, Elena Khamisov, Oleg Sayfutdinov, Timur Skolkovo Inst Sci & Technol Ctr Energy Syst Moscow 143026 Russia

The real-time robust and secure operation of power systems has become a challenging task, as the operating state evolves rapidly due to uncertainties associated with increasing renewable generation, less predictable loads, and various forms of contingencies. Therefore, an online voltage stability assessment is required to avoid any undesirable system behaviours or a large-scale blackout. Such evaluation is not just difficult but also computationally intensive mainly due to the continuously changing state of a grid. This study presents a numerically robust and fast algorithm for online voltage stability assessment with ease of implementation and programming. The proposed approach updates distance of voltage collapse in real-time by incorporating base-case collapse point solution and incoming data from measurement devices. Implementation of the proposed algorithm is described in detail, and its performance is validated on different IEEE test cases.

关键词： power system stability power system security load flow power system reliability Newton method online assessment power systems online voltage stability assessment robust algorithm voltage collapse Newton-corrector algorithm renewable generation large-scale blackout IEEE test cases

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Detecting synchrophasors computed over fault/switching transients

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IET GENERATION TRANSMISSION & DISTRIBUTION 2014年第9期8卷 1616-1625页

作者： Das, Sarasij Sidhu, Tarlochan Univ Western Ontario London ON Canada Univ Ontario Inst Technol Fac Engn & Appl Sci Oshawa ON Canada

Faults and switching operations often cause step changes in voltage and current waveforms. A fault/switching transient synchrophasor is computed over a window of pre- and post-fault/switching samples. Many synchrophasor applications are not designed to use these transient synchrophasors. So, there is a need to detect fault/switching transient synchrophasors. A robust algorithm is proposed to detect synchrophasors computed over switching/fault transients. The proposed algorithm runs in phasor measurement unit. The proposed algorithm performs satisfactorily in the presence of noises, harmonics, off nominal frequencies, decaying DC and missing/bad samples. The proposed algorithm can detect fault/switching transient synchrophasors caused by smaller or larger disturbances. The proposed algorithm is simple, non-iterative and mainly needs additions. Possible applications of the proposed algorithm are also discussed.

关键词： phasor measurement robust algorithm fault-switching transient synchrophasor current waveform voltage waveform synchrophasors detection

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Source Localization by a Partially Calibrated Array in an Uncertain Transmission Channel

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ACOUSTICAL PHYSICS 2018年第1期64卷 91-98页

作者： Sazontov, A. G. Smirnov, I. P. Russian Acad Sci Inst Appl Phys Nizhnii Novgorod 603600 Russia Lobachevsky State Univ Nizhny Novgorod Nizhnii Novgorod 603022 Russia

A robust Capon-type algorithm is constructed for source localization by a partially calibrated array operating in an uncertain environment. Results of statistical modeling are presented to determine the accuracy of source localization and the probability of correct source detection. Experimental testing of the proposed method is carried out to demonstrate its performance in Ladoga Lake.

关键词： source localization partially calibrated subarray-based array robust algorithm statistical modeling experimental testing

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Optimal Multiple-Impulse Circular Orbit Phasing

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2016年第7期39卷 1675-+页

作者： Trofimov, Sergey P. Ovchinnikov, Mikhail Yu. Keldysh Inst Appl Math Spaceflight Mech & Control Dept 4 Miusskaya Pl Moscow 125047 Russia Keldysh Inst Appl Math Spaceflight Mech & Control Dept Attitude Control Syst & Orientat Div 4 Miusskaya Pl Moscow 125047 Russia

A study considers the fundamental problem of circular orbit phasing by performing a multiple-impulse maneuver. It is shown below that the peculiar properties of the considered problem allow a simpler procedure of finding the globally optimal solution. It appears to be composed of two- and four-impulse maneuvers and switches between them as the phasing maneuver duration grows. Two-impulse maneuvers do not require any optimization, as they are unambiguously calculated as least-delta-v solutions to the multiple-revolution Lambert problem.

关键词： Circular Orbits Lambert's Problem Attitude Control System Spaceflight Mechanics Orbit Phasing Satellites Spacecraft Trajectories Numerical algorithms robust algorithm Fuel Consumption

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Modified Backstepping algorithm with Disturbances Compensation

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IFAC-PapersOnLine 2015年第11 11期48卷 1056-1061页

作者： Furtat, Igor Furtat, Elena Tupichin, Evgeny A. Institute for Problems of Mechanical Engineering Russian Academy of Sciences 61 Bolshoy ave V.O. Saint Petersburg199178 Russia ITMO University 49 Kronverkskiy ave Saint Petersburg197101 Russia

The paper describes the robust algorithm for compensation of mismatched disturbances. The synthesis of control system based on a backstepping algorithm and an auxiliary loop algorithm. The proposed algorithm guarantees that the plant state vector tends to the zero with the required accuracy. We also compare the proposed algorithm with the backstepping algorithm and the auxiliary loop algorithm. The simulation results illustrate the efficiency and robustness of the suggested control system. © 2015

关键词： Backstepping Control system synthesis Auxiliary loops Backstepping algorithms Mismatched disturbance Plant state vectors robust algorithm

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Propellant-Optimal Powered Descent Guidance

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2018年第4期41卷 813-826页

作者： Lu, Ping San Diego State Univ Dept Aerosp Engn San Diego CA 92182 USA

The problem of guiding a rocket-powered vehicle to land on a planet (or the Moon) with pinpoint precision and minimum propellant usage is the focus of this work. Three related but different versions of optimal powered descent problems are formulated with different intended purposes. Comparison and relationships among the solutions to these problems are analyzed. A theoretical investigation reveals the detailed structure of the optimal thrust magnitude profile in the problems and helps significantly simplify the design of the guidance algorithm. An indirect-method-based fast and robust algorithm is developed to solve these problems. Another unique contribution of this paper is a novel and simple strategy to adaptively determine onboard a desirable powered descent initiation condition so that no major divert is required of the powered descent trajectory. The algorithm is demonstrated in closed-loop simulations for a human Mars mission where a significantly heavier landing mass and more stringent landing precision are required than in any robotic missions thus far.

关键词： Propellant Powered Descent Initiation Planets Lunar Landing Rocket Trajectories Closed Loop robust Guidance algorithm Moon robust algorithm Transversality Condition

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A co-median approach to detect compositional outliers

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JOURNAL OF APPLIED STATISTICS 2016年第13期43卷 2348-2362页

作者： Di Palma, M. A. Gallo, M. Univ Naples L Orientale Dept Human & Social Sci Naples Italy

Compositional data consist of vectors of positive values summing up to a unit or to some fixed constant. They find application in chemometrics, geology, economics, psychometrics and many other field of studies. In statistical analysis many theoretical efforts have been dedicated to identify procedures able to accomodate outliers included in the estimation of the model even in compositional data. The principal purpose of this work is to introduce an alternative robust procedure, defined as COMCoDa, capable to cope with compositional outliers and based on median absolute deviation (MAD) and correlation median. The new method is first evaluated in a simulation study and then on real data sets. The algorithm requires considerably less computational time than other procedures already existing in literature, it works well for huge compositional data sets at any level of contamination.

关键词： COMCoDa isometric log-ratios MAD outlier detection Mahalanobis(ilr) median robust algorithm

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robust computation of intersection graph between two solids

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COMPUTER GRAPHICS FORUM 1997年第3期16卷 C79-C88页

作者： Nakamura, H Higashi, M Hosaka, M Toyota Technological Institute 2-12-1 Hisakata Tempaku-ku Nagoya 468 Japan

We propose a new robust algorithm for Boolean operations on solid models. The algorithm produces a consistent intersection graph between two input solids whose geometrical data are represented in floating point numbers. In order to prevent numerical calculation errors and inaccuracy of input data from causing inconsistency of the output, we put higher priority on symbolical connectivity of the edge-face intersection points than their numerical nearness. Each edge-face intersection point is symbolically represented using face names, which generate connectivity relations between the intersection points and the intersection line segments. The symbols with the same connectivity are made into clusters. The intersection line segments connected together at their end clusters form the intersection graph of two solids. Inconsistency of the connectivity of the clusters is detected and the intersection graph is corrected automatically. We describe the algorithm in detail for polyhedral solids, discuss extension to curved solids, and show its effectiveness by some examples of Boolean operations for two solids whose faces intersect at a very small angle.

关键词： solid model Boolean operation robust algorithm

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