WSEAS Transactions on Systems
Print ISSN: 1109-2777
Volume 14, 2015
Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of WSEAS Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.
Volume 14, 2015
Title of the Paper: Performance Analysis and Control Simulation of Pneumatic Liquid Online Automatic Balancing System for Rotating Machinery
Authors: Pan Xin, Wu Hai-Qi, Gao Jin-Ji, Mu Yu-Zhe
Abstract: Online automatic balancing is considered to be the best solution to reduce unbalance vibrations of rotating machinery. The pneumatic liquid online automatic balancing device presented in this paper is a new type of liquid balancers, including a sealed balancing disc rotating with rotor and an air distributor mated with the balancing disc. Balancing liquid is transferred between opposite chambers by compressed air and a correcting mass is formed to balance the detected device through the change of liquid distribution in balancing disc. For a horizontal experimental installation, several performance parameters of the balancing device were analyzed, such as the volume of balancing liquid, the maximum of balancing ability and the liquid flow velocity in the connecting tube. A simulation model of the balancing device was also built using Labview virtual instrument platform and its parameters were set in accordance with the experimental device. A one by one chamber trial algorithm and a target vector algorithm were used to simulate in the model. The simulation results demonstrated that both of the two algorithms could reduce the unbalance vibrations efficiently by choosing appropriate control parameters although the liquid flow rate of balancing device was a variable value, and the target vector algorithm had a faster balancing speed and avoided the misadjustment phenomenon during the balancing process.
Keywords: Rotating machinery, Unbalance vibration, Automatic balancing, Pneumatic liquid, Control simulation, Performance analysis
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #27, pp. 286-295
Title of the Paper: Fuzzy Logic Inference of Technological Parameters of the Combine-Harvester
Authors: Lyudmila V. Borisova, Inna N. Nurutdinova, Valery P. Dimitrov
Abstract: The problem of determining optimal values of the combine-harvester technological parameters in changing external conditions is considered. A brief overview of the existing approaches to the solution of the given problem and the fields of their application is presented. We note the expediency of applying a new approach that is stipulated by the necessity of an efficient choice of values of the harvester technological parameters in field conditions when external factors constantly change and the assessment of their values is approximate and presented by experts. This type of assessments is referred to fuzzy data. To describe the environmental factors, the machine parameters and qualitative performance characteristics we have introduced linguistic variables, developed their membership functions and formulated production rules. We have considered the process of fuzzy logic inference of values of the most important adjustable parameters of the combine: travelling speeds and rotational speeds of a threshing drum. A knowledge base and an inference engine forming the basis of the expert system have been created. We have implemented the software that uses our fuzzy model for the automation of the harvester technological adjustment in the field.
Keywords: combine-harvester, technological adjustment, fuzzy knowledge, linguistic variable, expert system
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #26, pp. 278-285
Title of the Paper: Linear Electromechanical Actuators Affected by Mechanical Backlash: a Fault Identification Method Based on Simulated Annealing Algorithm
Authors: M. D. L. Dalla Vedova, D. Lauria, P. Maggiore, L. Pace
Abstract: Several approaches can be employed in prognostics, to detect incipient failures of primary flight command electromechanical actuators (EMA), caused by progressive wear. The development of a prognostic algorithm capable of identifying the precursors of an electromechanical actuator failure is beneficial for the anticipation of the incoming faults: a correct interpretation of the fault degradation pattern, in fact, can trig an early alert of the maintenance crew, who can properly schedule the servomechanism replacement. The research presented in this paper proposes a fault detection / identification technique, based on approaches derived from optimization methods, able to identify symptoms of EMA degradation before the actual exhibition of the anomalous behavior; in particular, the authors’ work analyses the effects due to progressive backlashes acting on the mechanical transmission and evaluates the effectiveness of the proposed approach to correctly identify these faults. An experimental test bench was developed: results show that the method exhibit adequate robustness and a high degree of confidence in the ability to early identify an eventual fault, minimizing the risk of false alarms or not annunciated failures.
Keywords: Mechanical Backlash, Electromechanical Actuator, Prognostics, Simulated Annealing Algorithm
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #25, pp. 268-277
Title of the Paper: Simulation Application for Evaluating of Efficiency of Mining Systems Automatization
Authors: Vasiliy V. Sinoviev, Aleksey N. Starodubov, Mihail U. Dorofeev, Victor V. Okolnishnikov
Abstract: The fact that application of simulation is expedient for concrete proposal selection is shown in the article after analysis of existing proposals of mine works automation. To solve this task, models of mine technical systems were developed on queuing theory base with software implementation on a specialized simulation language GPSS World. Methods of mine technical systems automatization efficiency estimation, which is based on the minimum labor input criterion of cycle in entered mine-geological conditions is proposed. As example task solution of selection of efficient automatization mine technical system variant with use the proposed method. In the article conclusion we showed prospects of further work which is reduced to creation of specialized software product for engineer.
Keywords: Automatization, mining systems, simulation, queuing system
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #24, pp. 261-267
Title of the Paper: Application of Cascade Nonlinear Control for a CSTR
Authors: Petr Dostál, Vladimír Bobál, Jiří Vojtěšek
Abstract: The article deals with the cascade nonlinear control of a chemical continuous stirred tank reactor. The control is performed in primary and secondary control-loops where the primary controlled output of the reactor is a concentration of the main reaction product and the secondary output is the reactant temperature. A common control input is the coolant flow rate. The controller in the primary control-loop is a P-controller with an adjustable gain. A controller in the secondary control-loop consist of the static nonlinear and the dynamic adaptive linear part. The proposed method is verified by control simulations.
Keywords: chemical reactor, cascade control, nonlinear control, external linear model, adaptive control
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #23, pp. 252-260
Title of the Paper: Disturbance Decoupling Problems for Switched Linear Systems. A Geometric Approach
Authors: M. I. García-Planas
Abstract: In this paper disturbance decoupling problem for switched linear systems is formulated under a geometrical point of view. Necessary and sufficient conditions for the problem with standardizable condition to be solvable are given.
Keywords: Disturbance decoupling, switched linear systems, invariant subspaces
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #22, pp. 244-251
Title of the Paper: Robust Digital LQ Control of Time-Delay Systems
Authors: Vladimír Bobál, Petr Dostál, Marek Kubalčík
Abstract: Time-delays are mainly caused by the time required to transport mass, energy or information, but they can also be caused by processing time or accumulation. Typical examples of such processes are e.g. pumps, liquid storing tanks, distillation columns or some types of chemical reactors. This paper deals with a design of universal and robust digital control algorithms for control of great deal of processes with time-delay. These algorithms are realized using the digital Smith Predictor (SP) based on polynomial approach – by minimization of the Linear Quadratic (LQ) criterion. For minimization of the LQ criterion is used spectral factorization principle with application of the MATLAB Polynomial Toolbox. The designed polynomial digital SPs were verified in simulation conditions (and also using an experimental model of a laboratory heat exchanger). The main contribution of this paper is an experimental simulation examination of the robustness of the designed control algorithms. The program system MATLAB/SIMULINK was used for this purpose.
Keywords: Digital control, LQ control, Polynomial approach, Simulation of control loops, Smith Predictor, Time-delay, Robustness
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #21, pp. 234-243
Title of the Paper: Fault Diagnosis Method Based on a New Supervised Locally Linear Embedding Algorithm for Rolling Bearing
Authors: Hongfang Yuan, Xue Zhang, Yangyang, Huaqing Wang
Abstract: In view of the complexity and nonlinearity of rolling bearings, this paper presents a new supervised locally linear embedding method (R-NSLLE) for feature extraction. In general, traditional LLE can capture the local structure of a rolling bearing. However it may lead to limited effectiveness if data is sparse or non-uniformly distributed. Moreover, like other manifold learning algorithms, the results of LLE and SLLE depend on the choice of the nearest neighbors. In order to weaken the influence of the random selection of the nearest neighbors, R-NSLLE, a supervised learning method, is used to find the best neighborhood parameter by analyzing residual. In addition, a nonlinear measurement based on SLLE is proposed as new criterion. In this paper, the original feature set is obtained through singular value decomposition in the phase space reconstructed by the C-C method. R-NSLLE is used for nonlinear dimensionality reduction, which can further extract fault features. Following this, R-NSLLE is compared with other nonlinear methods of dimensionality reduction, such as SLLE, LLE, LTSA and KPCA. The effectiveness and robustness of R-NSLLE have been verified in the experiment, and the accuracy and silhouette coefficient of the proposed method have been further discussed. These show that this feature extraction method, which is based on R-NSLLE, is more effective and can identify the intrinsic structural of rolling bearing even when there is a little fault.
Keywords: Phase Space Reconstruction, Manifold Learning, SLLE, LLE, Rolling Bearing, Fault Diagnosis, Feature Extraction
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #20, pp. 222-233
Title of the Paper: Composite Control for Nonlinear Singularly Perturbed Systems Based on Feedback Linearization Method
Authors: Aleksey A. Kabanov
Abstract: This article is devoted to the synthesis of composite control for nonlinear singularly perturbed system using feedback linearization (FL). The idea of this method consists in converting the original nonlinear system into a linear one by means of state feedback and coordinate transformation. Then, methods of control theory for linear systems are used for system design. If the original nonlinear system cannot be linearized exactly by state feedback, the method of approximate feedback linearization (AFL) is used. The essence of approximate feedback linearization methods lies in the feedback linearization only of the some part of the original nonlinear system (not the entire system). In this paper, we propose a method of approximate feedback linearization control of nonlinear singularly perturbed (SP) systems. Proposed method is based on the decomposition of the original SP system and the construction of control input in the form of asymptotic composition of FL controls for slow and fast subsystems. The resulting AFL control is obtained in the form of composite control. The application of the proposed approach is illustrated through the speed control of a DC series motor.
Keywords: approximate feedback linearization, singularly perturbed system, composite control, decomposition
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #19, pp. 215-221
Title of the Paper: Spectrum Shaping Based Control Strategy for Unstable TDS
Authors: Libor Pekař
Abstract: Two possible controller parameters tuning methodologies based on the computational shaping of zeros/poles spectrum of unstable time delay systems (TDS) are presented. Namely, the spectral abscissa minimization based on Quasi-Continuous Shifting Algorithm (QCSA) followed by an advanced iterative optimization algorithm, and the Pole Placement Shifting based Algorithm (PPSA) moving the dominant poles and/or zeros of infinite spectra to the prescribed positions as close as possible step by step are introduced. These desired loci can be determined by a finite-dimensional model matching problem. In contrast to works we extend and to our previous works, the paper concerns unstable TDS in the sense of exponential stability and, moreover, both retarded and neutral TDS are considered. As presented by numerical examples, both the methodologies are closely related to each other and the latter one can collapse close to the former one. The reader is also provided with potential ideas of the future research within this task.
Keywords: Model matching, Optimization, Root locus, Spectrum shaping, Unstable system, Time-delay systems
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #18, pp. 203-214
Title of the Paper: Attack-Surface Metrics, OSSTMM and Common Criteria Based Approach to “Composable Security” in Complex Systems
Authors: Andrea Fiaschetti, Andrea Lanna, Martina Panfili, Silvano Mignanti, Antonio Pietrabissa, Francesco Delli Priscoli, Roberto Cusani, Gaetano Scarano, Andrea Morgagni
Abstract: In recent studies on Complex Systems and Systems-of-Systems theory, a huge effort has been put to cope with behavioral problems, i.e. the possibility of controlling a desired overall or end-to-end behavior by acting on the individual elements that constitute the system itself. This problem is particularly important in the “SMART” environments, where the huge number of devices, their significant computational capabilities as well as their tight interconnection produce a complex architecture for which it is difficult to predict (and control) a desired behavior; furthermore, if the scenario is allowed to dynamically evolve through the modification of both topology and subsystems composition, then the control problem becomes a real challenge. In this perspective, the purpose of this paper is to cope with a specific class of control problems in complex systems, the “composability of security functionalities”, recently introduced by the European Funded research through the pSHIELD and nSHIELD projects (ARTEMIS-JU programme). In a nutshell, the objective of this research is to define a control framework that, given a target security level for a specific application scenario, is able to i) discover the system elements, ii) quantify the security level of each element as well as its contribution to the security of the overall system, and iii) compute the control action to be applied on such elements to reach the security target. The main innovations proposed by the authors are: i) the definition of a comprehensive methodology to quantify the security of a generic system independently from the technology and the environment and ii) the integration of the derived metrics into a closed-loop scheme that allows real-time control of the system. The solution described in this work moves from the proof-of-concepts performed in the early phase of the pSHIELD research and enriches it through an innovative metric with a sound foundation, able to potentially cope with any kind of application scenarios (railways, automotive, manufacturing, …).
Keywords: Complex Systems, Closed-loop, Dynamic Composability, E2E Security, Common Criteria, Attack surface metrics, Optimization
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #17, pp. 187-202
Title of the Paper: Influence of the Properties of a Real Semi Anechoic Chamber on an Internal Electromagnetic Field Distribution
Authors: Martin Pospisilik, Josef Soldan, Milan Adamek
Abstract: This paper describes an experiment dealing with monitoring of an electrical field displacement within a real semi anechoic chamber of an irregular shape. The experiment is based on the assumption that the semi anechoic chamber acts as a cavity resonator, and the possibilities of the internal frequency modes of damping are technically limited. In semi anechoic chambers for electromagnetic compatibility testing, this phenomenon leads to a variation of the field strength in the space of the chamber, which may affect the accuracy of the measurement. Therefore, accurate mapping of the chamber’s influence to the measurement can help the engineers to improve the methods of equipment testing on electromagnetic compatibility, making it faster, more accurate and more controlled. An example of a response of the semi anechoic chamber operated at Tomas Bata University in Zlin is provided within the framework of this paper, as well as a discussion on the results obtained.
Keywords: Semi Anechoic Chamber, Electromagnetic Compatibility, Electrical Field Distribution, Dominant Modes
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #16, pp. 174-186
Title of the Paper: Heteroclinic Chaos in Attitude Dynamics of a Dual-Spin Spacecraft at Small Oscillations of its Magnetic Moment
Authors: Anton V. Doroshin
Abstract: The paper contains an investigation results in the heteroclinic dynamics of a magnetic (magnetized) dual-spin spacecraft (DSSC) in the geomagnetic field at the realization of the orbital motion of its mass centre along an equatorial circular orbit. Exact heteroclinic analytical solutions are obtained. These analytical exact solutions are used for the research of the DSSC perturbed motion and its chaotization properties at the presence of small polyharmonic perturbations of the magnetic moment.
Keywords: Magnetic/Magnetized Dual-Spin Spacecraft, Heteroclinic Explicit Solutions, Melnikov Function, Lagrange Top, Euler Top, Chaos
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #15, pp. 158-173
Title of the Paper: A Global-Voting Map Matching Algorithm on the Base of Taxi GPS Data
Authors: Xu-Hua Yang, Xiang-Fei Wang
Abstract: Since the existing floating car map-matching algorithms lead to high error rate when GPS data sampling rate is low, we propose a global-voting map matching algorithm. Based on floating car GPS track data, the algorithm do not only consider the influence to matching process caused by the topological information of road network but also the different spatial distance of GPS track data. In this matching algorithm, we device a new indicator to model the influence of geometric and topological information of road network and define a static matching matrix (SMM) as intermediate results. Based on the SMM, we define a distance weighted function to revise the SMM and build a dynamic matching matrix (DMM), and the function reflects the strength of the influence weighted by the distance between GPS points. After that, referring the DMM, we design an efficient voting algorithm to identify the optimal trajectory as map matching results. In this paper, we apply the algorithm to real Hangzhou taxi data. Results show that this map matching algorithm can make full use of existing information and perform well when GPS data sampling rate is low.
Keywords: floating car, taxi GPS data, low-sampling-rate, global-voting, map matching, topological information, road network
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #14, pp. 148-157
Title of the Paper: The Evolution of a μController Autonomous Compact System for Biomeasurements Logging via WSN
Authors: E. Shanko, M. G. Papoutsidakis, Filippo Neri
Abstract: This thorough investigation has been made on how to deliver cost-effective emergency services and yet, they still remain a challenge of pivotal importance for the healthcare industry. This project displays the practicability of flexible exploitation, of equipment to notify others when patient-user needs an emergency interference. In regard to factors that mediate inefficiency, premature discernment of emergent heart problems can allow medical interventions to reduce the impact and severity of heart-related incidents to users. This equipment combines technologies of digital cellular communication with data transmission via a Wireless Sensor Network. It unifies software and hardware engineering for heart monitoring with respect to human body and environmental temperature at a low cost and ease to use at home. Herein, we describe an ascendable emergency medical response system that unites the efficient data collection of a pulse and two temperature sensors (environmental and body) with internet data transmission plus distance monitoring data with the flexibility and interoperability of GSM / GPS / Wireless Sensor Network service architecture with no need of suppliers. Worth mentioning is that users significantly ameliorate their insecurity and such device has a tremendous impact on their everyday activities.
Keywords: Emergency Medical Response, Heart Rate and Temperature Signs, GSM, GPS, Wireless Sensor Network (WSN)
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #13, pp. 137-147
Title of the Paper: An Inspection System for Pharmaceutical Glass Tubes
Authors: Pierfrancesco Foglia, Cosimo Antonio Prete, Michele Zanda
Abstract: Syringes, vials and carpules for pharmaceutical products are usually made of borosilicate glass. Such containers are made by glass converting companies starting from single glass tubes. These glass containers can suffer from inclusions, air bubbles, stones, scratches and others issues, that can cause subsequent problems like product contamination with glass particulate or cracks in the glass. In recent years, more than 100 million units of drugs packaged in vials or syringes have been withdrawn from the market. As a consequence pharmaceutical companies are demanding an increased delivery of high quality products to manufacturers of glass containers and therefore of glass tubes. An automatic, vision based, quality inspection system can be devoted to perform such task, but specific process features requires the introduction of ad-hoc solutions: in the production lines tubes significantly vibrate and rotate, and the cylindrical surface of the tube needs to be inspected at 360 degrees. This paper presents the design, the development and the experimental evaluation of a vision system to control the quality of glass tubes, highlighting the specific solutions developed to manage vibrations and rotations, obtaining a 360 degree inspection. The system has been designed and tested in a real facility, and proved effective in identifying defects and impurities in the order of tens of microns.
Keywords: Inspection systems, glass tube manufacturing, quality check, machine vision systems, image processing algorithms, 360 degree Inspection
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #12, pp. 123-136
Title of the Paper: Ordinal Multicriteria Methods Applied to the Ranking of Naval and Aerial Defense Systems: Two Hierarchical Approaches Based on the Borda Method
Authors: Ana Paula Dos Santos Rubem, Eduardo Siqueira Brick, João Carlos Correia Baptista Soares De Mello
Abstract: The aim of this paper is to enable a wide range of comparisons regarding the relative naval and aerial warfare capabilities of different nations. With this purpose, two ordinal multicriteria methods have been used to rank order the countries comprised in the analysis. The methods applied were the original Borda and its modified version that uses the median to aggregate the criteria. Due to the inherent hierarchy of the criteria structure, it was necessary to develop hierarchical approaches for applying both methods. The results indicate that, although less influenced by irrelevant alternatives, the power of discrimination among alternatives may decrease, when the hierarchical approach builds on the modified Borda method. In the rankings derived from the analysis, the Turkish defense system obtained the first position when the methodology bases on the original Borda method, while Japan is ranked first if the hierarchical approach grounds on the modified version of that method.
Keywords: Multicriteria, Defense System, Borda method, Modified Borda method
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #11, pp. 112-122
Title of the Paper: Fault Diagnosis of Rolling Bearings Based on SURF Algorithm
Authors: Hongfang Yuan, Wen Feng, HongWei Qu, Huaqing Wang
Abstract: This paper proposed a new method for fault diagnosis of rolling bearings based on SURF (Speeded-Up Robust Features) algorithm, where two-dimension signal is used. Different from other classical 1-d signal processed methods, the proposed method transforms the 1-dimensional vibration signals into images, then image processed methods are utilized to analyze the image signal so as to reach the goal of faulty classification. Images transformed from vibration signals often have special texture features and each faulty category’s texture varies. SURF is a computer vision algorithm improved from SIFT (Scale Invariant Feature Transform) algorithm, and it can more efficiently extract local features through the texture of the image. Firstly, normalized time domain vibration signals were converted into gray-scale images. Then the mean filter was employed to complete the image pre-processing. Secondly, local features were extracted from the images by using SURF algorithm. Through the mean-shift clustering algorithm, extracted features were clustered to form a texture dictionary. Finally, features extracted from testing signals were compared with the texture dictionary to determine the corresponding faulty category. To validate the proposed method, several comparative experiments between SURF and SIFT-based algorithm have been carried out. The experimental results indicate that the proposed method outperforms the existing SIFT descriptor in terms of classification accuracy and computation cost for bearing fault diagnosis.
Keywords: fault diagnosis, rolling bearing, SURF, feature vector, mean-shift clustering, computation cost
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #10, pp. 102-111
Title of the Paper: Power-Quality Enhancer Using an Artificial Bee Colony-Based Optimal-Controlled Shunt Active-Power Filter
Authors: Essamudin Ali Ebrahim
Abstract: Variable speed drives (VSDs) use power electronic components - as controlled switches - which distort the sinusoidal current and voltage waveforms of AC grid due to harmonic injection at the point of common coupling (PCC). These harmonics and distortions are propagated through the power network and affect all other connected loads. So, the shunt active power filter (SAPF) is one of the proposed tools to mitigate these harmonics. In this paper, an artificial bee colony (ABC)- based optimal-controlled SAPF is proposed to provide instantaneous reactive power compensation required for harmonic mitigation of a separately excited DC motor – as a dynamic load - fed from uncontrolled- bridge rectifier via a GTO-thyristorized-DC chopper. The proposed technique uses three-phase hysteresis-current controller inverter connected with reactors as an active power filter. The dc- link voltage of that inverter is controlled using PID-controller. Tuning of the PID-parameters depends on artificial bee colony optimization. The proposed ABC- controller is employed to search for optimal controller parameters by minimizing the error signal - as an objective function - of a dc-link for the inverter. The performance of the proposed filter that called ABC-SAPF is carried out by simulation under steady-state and dynamic operations using MATLAB/ SIMULINK software. Also, these results are compared with other control approaches as ANN and fuzzy logic. The results show that it is an effective in enhancement dynamic of power quality and also the overall total harmonic distortion (THD) is minimized to safe-limit according to the harmonic restriction standards such as IEEE-519 and IEC 61000.
Keywords: Artificial bee colony, power quality, hysteresis current controller, shunt active power filter, Objective function, Scout and Onlookers, point of common coupling, total harmonic distortion
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #9, pp. 90-101
Title of the Paper: Indeterminacy Reduction in Agent Communication Using a Semantic Language
Authors: Horacio Paggi, Michael Cochez
Abstract: In recent years, the importance of vagueness and uncertainty in the messages exchanged between agents has been highlighted mainly due to the ubiquitous nature of the (artificial or human) agents’ communication. The imprecision in the communication becomes more significant when the autonomy of the agents increases or the number of exchanged messages for a communicative goal is limited. In this paper we conjugate ideas drawn from situation semantics theory, human communication, and the multi-agent systems (MAS) field to reduce the impact of vagueness and uncertainty present in the communicative acts. The main advances are achieved with the help of context information, collaboration and reinforcement learning using an agent communication language: the Semantic Agent Programming Language (S-APL).
Keywords: Communication semantics, multi-agent systems programming language, message vagueness
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #8, pp. 77-89
Title of the Paper: Gene Regulatory Network to Control and Simulate Virtual Creature's Locomotion
Authors: Ahmed Tibermacine, Noureddine Djedi
Abstract: This paper explores the application of evolutionary computation techniques for evolving behaviours of virtual creatures inhabiting a realistic virtual environment. Our approach uses a computational model of gene regulatory network, which is inspired of cell control mechanism of real cells. Usually used to control virtual cells in developmental models, recent works showed that gene regulatory networks are also capable to control various kinds of agents. This paper details how a gene regulatory network is evolved to control range of articulated virtual creatures. To do so, the inputs and outputs of the network are directly mapped to the creatures’ sensors and actuators. To evaluate this approach, we have compared its performance to one of the most recent successful evolutionary methods, the NEAT algorithm. The results show the gene regulatory network model may possibly be a viable solution for evolving control solutions for physical machines.
Keywords: Gene regulatory network, virtual creature, behaviour control, physical simulation, Evolutionary computation
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #7, pp. 64-76
Title of the Paper: Numerical Study of Occupants’ Evacuation from a Room for Requirements in Codes
Authors: Hl Mu, Jh Sun, Filippo Neri, Sm Lo
Abstract: During fires or other emergencies, occupants of buildings or specific areas need to escape from the hazardous location as quickly as possible. Efficient and safe evacuation of these occupants is a core research topic in the public security field. With reference to the provisions in various codes, some specific requirements are not the same, such as the required number of occupants in a room with a single exit, the minimum width of the exit and the angle between two exits in a room. Combined with the detailed evacuation requirements, research of constructing an optimized building environment to facilitate the evacuation of occupants is of important realistic significance. The evacuation simulation model employed is based on a social force model in order to investigate the effect of each influence factors on clearance (evacuation) time. The research results have the potential to provide a theoretical foundation and the technical support for improving evacuation processes as well as the relevant evacuation standards implemented in various countries.
Keywords: Occupants’ Evacuation, Simulation, Clearance Time, Requirements in Codes, Social Force Model
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #6, pp. 54-63
Title of the Paper: New Prognostic Method Based on Spectral Analysis Techniques Dealing with Motor Static Eccentricity for Aerospace Electromechanical Actuators
Authors: D. Belmonte, M. D. L. Dalla Vedova, P. Maggiore
Abstract: The prognostic algorithms are important to identify the precursors of incipient failures of electromechanical actuators (EMA) applied to aircraft primary flight controls. Keeping in mind the risk related to the performed functions of these actuators the anticipation of an incoming failure is really useful: a correct interpretation of the failure degradation pattern, in fact, can trig an early alert of the maintenance crew, who can properly schedule the servomechanism replacement, increasing the aircraft safety and reliability. In this paper the authors propose an innovative prognostic model-based approach, able to recognize the symptoms of an EMA degradation before the explicit exhibition of the anomalous behavior. The identification/evaluation of the considered incipient failures is performed analyzing proper critical system operational parameters, able to put in evidence the corresponding degradation path, by means of a numerical algorithm based on spectral analysis techniques. Subsequently, these operational parameters are correlated with the actual health condition of the considered system by means of failure maps created by a reference monitoring model-based algorithm. In the present work, the proposed method has been applied to an EMA with a brushless DC motor affected by a progressive increase of the static eccentricity of the rotor. In order to evaluate the performances of the aforesaid prognostic method a test simulation environment, able to manage different failure modes, has been defined. This numerical test case simulates the dynamic behaviors of the EMA taking into account nonlinear effects related to different kinds of progressive mechanical failures (such as transmission backlash, friction, and rotor static eccentricity). Results show that the method exhibit adequate robustness and a high degree of confidence in the ability to early identify a malfunctioning, minimizing the risk of fake alarms or unannounced failures.
Keywords: BLDC Rotor Static Eccentricity, Electromechanical Actuator (EMA), Prognostics and Health Management (PHM), Prognostic Precursors, Progressive Failures, Spectral Analysis
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #5, pp. 45-53
Title of the Paper: Estimating the Impact of Observational Data on Forecasts Made by Coupled Nonlinear Dynamical System
Authors: Sergei Soldatenko, Denis Chichkine
Abstract: In this paper, the adjoint-base technique is applied to estimate the observational impact on the forecast quality using the coupled nonlinear chaotic dynamical system obtained by combining two (fast and slow) versions of the Lorenz system. The exploration of forecast sensitivity with respect to observations and the estimation of the observational impact on the forecast quality require considerable computational resources. For simple-enough low-order models, the computational cost is minor and therefore models of this class can be used as simple test instruments to emulate more complex systems. The method is incorporated into the existing four-dimensional variational data assimilation system. The objective function represents the difference between total energy norms of the background and calculated forecast error. Since data assimilation procedure shadows the “true” state of a system given by the observational data, the shadowing property of coupled nonlinear chaotic dynamical system is considered for weak and strong coupling between fast and slow subsystems. The discussed approach can be used in designing the optimal observing network and estimating the value of various observations.
Keywords: Dynamical system, chaotic dynamics, data assimilation, adjoint model, observation impact, sensitivity analysis
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #4, pp. 33-44
Title of the Paper: Accuracy Improve Methods for Magnetoelectric Converter Based Scanning System
Authors: Subbotin Dmitrii, Sergey Lovlin, Madina Tsvetkova
Abstract: The performance of reversible magneto electric converter based scanning system primarily depends on the control system, which performance is provided in turn by reliability of the real object and the mathematical model used for the calculations, and the reference signal. The article describes a mathematical model of the two-mass reversible scanning mechanism, its comparison with the real system and provides a procedure for constructing an algorithm for defining the inertial reverse scanning device input signal.
Keywords: Two-mass mechanism, magnetoelectric converter, reversible scanning device, mathematical model, input assignment, reference signal, setting device
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #3, pp. 26-32
Title of the Paper: Recent Advances on Locomotion Mechanisms of Hybrid Mobile Robots
Authors: Shun Hoe Lim, Jason Teo
Abstract: Many types of hybrid mobile robots that combine the characteristics of wheeled robot and legged robot have been developed in the past two decades. This paper is aimed at presenting a survey on various hybrid mobile robots based on their respective implemented locomotion mechanism. The survey is done on several recently developed hybrid mobile robots by inspecting the design concept of their locomotion mechanism. Besides that, this paper also discusses the factors that influence the design of a robust robotics platform which are important to consider when designing a robot. This work will be useful as a preliminary reference point for those who want to design a hybrid mobile robot.
Keywords: Hybrid Mobile Robots, Robot Locomotion, Wheeled Robots, Autonomous Robots
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #2, pp. 11-25
Title of the Paper: Modelling and Analyzing Trust Conformity in E-Commerce Based on Fuzzy Logic
Authors: Guiping Wang, Shuyu Chen, Zhen Zhou, Jun Liu
Abstract: Along with the breakthrough of networking, communications, and information technology, E-Commerce gains rapid development in recent years. Trust is the premise and foundation of transaction activities in E-Commerce. While conformity is an important factor which influences customers’ trust to vendors, as well as customers’ choices in online purchasing. Conformity behaviour in E-Commerce is two-edged. It should be correctly treated and actively guided. In order to understand in depth conformity behaviour and its influence, this paper proposes a fuzzy logic approach to model conformity behaviour in E-Commerce. The proposed fuzzy logic system is simulated with MATLAB. Simulation results are congruent with observed conformity phenomena in E-Commerce. This paper then further discusses conformity behaviour in E-Commerce. This paper not only guides customers to properly trust vendors and prevent being cheated in electronic transactions, but helps designers develop more appropriate evaluation methods for trust in E-Commerce.
Keywords: Fuzzy modelling, Fuzzy logic, E-Commerce, Trust, Conformity behaviour, Credit speculation
WSEAS Transactions on Systems, ISSN / E-ISSN: 1109-2777 / 2224-2678, Volume 14, 2015, Art. #1, pp. 1-10