Journal of Control Science and Engineering https://www.hindawi.com The latest articles from Hindawi © 2017 , Hindawi Limited . All rights reserved. Rotor Speed Control of a Direct-Driven Permanent Magnet Synchronous Generator-Based Wind Turbine Using Phase-Lag Compensators to Optimize Wind Power Extraction Sun, 28 May 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/6375680/ Due to the intermittent nature of wind, the wind power output tends to be inconsistent, and hence maximum power point tracking (MPPT) is usually employed to optimize the power extracted from the wind resource at a wide range of wind speeds. This paper deals with the rotor speed control of a 2 MW direct-driven permanent magnet synchronous generator (PMSG) to achieve MPPT. The proportional-integral (PI), proportional-derivative (PD), and proportional-integral-derivative (PID) controllers have widely been employed in MPPT studies owing to their simple structure and simple design procedure. However, there are a number of shortcomings associated with these controllers; the trial-and-error design procedure used to determine the P, I, and D gains presents a possibility for poorly tuned controller gains, which reduces the accuracy and the dynamic performance of the entire control system. Moreover, these controllers’ linear nature, constricted operating range, and their sensitivity to changes in machine parameters make them ineffective when applied to nonlinear and uncertain systems. On the other hand, phase-lag compensators are associated with a design procedure that is well defined from fundamental principles as opposed to the aforementioned trial-and-error design procedure. This makes the latter controller type more accurate, although it is not well developed yet, and hence it is the focus of this paper. The simulation results demonstrated the effectiveness of the proposed MPPT controller. Ester Hamatwi, Innocent E. Davidson, and Michael N. Gitau Copyright © 2017 Ester Hamatwi et al. All rights reserved. An Optimization Model of Multi-Intersection Signal Control for Trunk Road under Collaborative Information Thu, 25 May 2017 07:23:11 +0000 http://www.hindawi.com/journals/jcse/2017/2846987/ We proposed a signal control optimization model for urban main trunk line intersections. Four-phase intersection was analyzed and modeled based on the Cell Transmission Model (CTM). CTM and signal control model in our study had both been improved for multi-intersections by three-phase theory and information-exchanging. To achieve a real-time application, an improved genetic algorithm (GA) was proposed finally, the DISCO traffic simulation software was used for numerical simulation experiment, and comparisons with the standard GA and CTM were reported in this paper. Experimental results indicate that our searching time is less than that of SGA by 38%, and our method needs only 1/3 iteration time of SGA. According to our DISCO traffic simulation processing, compared with SGA, if the input traffic flow is changed from free phase to synchronized phase, for example, less than 900 vel/h, the delay time can reduce to 87.99% by our method, and the minimum delay time is 77.76% of existing method. Furthermore, if input traffic volume is increased to 1200 vel/h or more at the synchronized phase, the summary and minimum values of average delay time are reduced to 81.16% and 75.83%, respectively, and the average delay time is reduced to 17.72 seconds. Xun Li, Zhengfan Zhao, Li Liu, Yao Liu, and Pengfei Li Copyright © 2017 Xun Li et al. All rights reserved. Fault Diagnosis and Application to Modern Systems Wed, 24 May 2017 06:35:51 +0000 http://www.hindawi.com/journals/jcse/2017/1026759/ Xiao He, Zidong Wang, Gang Li, Zhijie Zhou, and Youqing Wang Copyright © 2017 Xiao He et al. All rights reserved. DCA-Based Real-Time Residual Useful Life Prediction for Critical Faulty Component Sun, 21 May 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/8492139/ Residual useful life (RUL) prediction is significant for condition-based maintenance. Traditional data-driven RUL prediction method can only predict fault trend of the system rather than RUL of a specific system component. Thus it cannot tell the operator which component should be maintained. The innovation of this paper is as follows: () Wavelet filtering based method is developed for early detection of slowly varying fault. () Designated component analysis is introduced as a feature extraction tool to define the fault precursor of a specific component. () Exponential life prediction model is established by nonlinear fitting of the historical RUL and the fault size characterized by the statistics used. Once online detection statistics is obtained, real-time RUL of the critical component can be predicted online. Simulation shows the effectiveness of this algorithm. Funa Zhou, Jiayu Wang, and Yulin Gao Copyright © 2017 Funa Zhou et al. All rights reserved. Observer-Based Controller Design for a Class of Nonlinear Networked Control Systems with Random Time-Delays Modeled by Markov Chains Thu, 30 Mar 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/1523825/ This paper investigates the observer-based controller design problem for a class of nonlinear networked control systems with random time-delays. The nonlinearity is assumed to satisfy a global Lipschitz condition and two dependent Markov chains are employed to describe the time-delay from sensor to controller (S-C delay) and the time-delay from controller to actuator (C-A delay), respectively. The transition probabilities of S-C delay and C-A delay are both assumed to be partly inaccessible. Sufficient conditions on the stochastic stability for the closed-loop systems are obtained by constructing proper Lyapunov functional. The methods of calculating the controller and the observer gain matrix are also given. Two numerical examples are used to illustrate the effectiveness of the proposed method. Yanfeng Wang, Peiliang Wang, Zuxin Li, and Huiying Chen Copyright © 2017 Yanfeng Wang et al. All rights reserved. Distributed Optimization of Multiagent Systems in Directed Networks with Time-Varying Delay Wed, 29 Mar 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/7937916/ This paper addresses a distributed consensus optimization problem of a first-order multiagent system with time-varying delay. A continuous-time distributed optimization algorithm is proposed. Different from most ways of solving distributed optimization problem, the Lyapunov-Razumikhin theorem is applied to the convergence analysis instead of the Lyapunov-Krasovskii functionals with LMI conditions. A sufficient condition for the control parameters is obtained to make all the agents converge to the optimal solution of the system. Finally, an example is given to validate the effectiveness of our theoretical result. Junxiu Yan and Hui Yu Copyright © 2017 Junxiu Yan and Hui Yu. All rights reserved. Planar Smooth Path Guidance Law for a Small Unmanned Aerial Vehicle with Parameter Tuned by Fuzzy Logic Sun, 26 Mar 2017 09:58:39 +0000 http://www.hindawi.com/journals/jcse/2017/6712602/ A guidance law has been designed to guide the small unmanned aerial vehicle towards the predefined horizontal smooth path. The guidance law only needs the mathematical expression for the predefined path, the positions, and the velocities of the vehicle in the horizontal inertial frame. The stability of the guidance law has been demonstrated by the Lyapunov stability arguments. In order to improve the path following performance, one of the parameters of the guidance law is tuned by using the fuzzy logic which will still keep its stability. The simulation experiments in the Matlab/Simulink environment to realize the square-, circular-, and the athletics track-style paths following are given to verify the effectiveness of the proposed method. The simulation results show that the path following performance will be improved with smaller overshoot and oscillation amplitude and shorter arrival time with the parameter tuned. Yang Chen, Jianhong Liang, Chaolei Wang, Yicheng Zhang, Tianmiao Wang, and Chenghao Xue Copyright © 2017 Yang Chen et al. All rights reserved. Finite-Time Synchronization of Complex Dynamical Networks with Time-Varying Delays and Nonidentical Nodes Tue, 21 Mar 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/5072308/ In this paper, we investigated the finite-time synchronization (FTS) problem for a class of time-delayed complex networks with nonidentical nodes onto any uniformly smooth state. By employing the finite-time stability theorem and designing two types of novel controllers, we obtained some simple sufficient conditions for the FTS of addressed complex networks. Furthermore, we also analyzed the effects of control variables on synchronization performance. Finally, we showed the effectiveness and feasibility of our methods by giving two numerical examples. Ahmadjan Muhammadhaji, Abdujelil Abdurahman, and Haijun Jiang Copyright © 2017 Ahmadjan Muhammadhaji et al. All rights reserved. A Novel Multimode Fault Classification Method Based on Deep Learning Mon, 20 Mar 2017 09:42:51 +0000 http://www.hindawi.com/journals/jcse/2017/3583610/ Due to the problem of load varying or environment changing, machinery equipment often operates in multimode. The data feature involved in the observation often varies with mode changing. Mode partition is a fundamental step before fault classification. This paper proposes a multimode classification method based on deep learning by constructing a hierarchical DNN model with the first hierarchy specially devised for the purpose of mode partition. In the second hierarchy , different DNN classification models are constructed for each mode to get more accurate fault classification result. For the purpose of providing helpful information for predictive maintenance, an additional DNN is constructed in the third hierarchy to further classify a certain fault in a given mode into several classes with different fault severity. The application to multimode fault classification of rolling bearing fault shows the effectiveness of the proposed method. Funa Zhou, Yulin Gao, and Chenglin Wen Copyright © 2017 Funa Zhou et al. All rights reserved. Cloud-Based Fault Tolerant Control for a DC Motor System Thu, 16 Mar 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/5670849/ The fault tolerant control problem for a DC motor system is investigated in a cloud environment. Packet dropout phenomenon introduced by the limited-capacity communication channel is considered. Actuator faults are taken into consideration and fault diagnosis and fault tolerant control methods towards actuator faults are proposed to enhance the reliability of the whole cloud-based DC motor system. The fault diagnosis unit is then established with purpose of obtaining fault information. When the actuator fault is detected by comparing the residual signal with a predefined threshold, a residual matching approach is utilized to locate the fault. The fault can be further estimated by a least-squares filter. Based on the fault estimation, a fault tolerant controller is designed to guarantee the stability as well as the control performance of the DC motor system. Simulation result on a DC motor system shows the efficiency of the fault tolerant control method proposed in this paper. Xiao He, Yamei Ju, Yang Liu, and Bangcheng Zhang Copyright © 2017 Xiao He et al. All rights reserved. Investigation and Control of VIVs with Multi-Lock-in Regions on Wide Flat Box Girders Tue, 14 Mar 2017 09:32:35 +0000 http://www.hindawi.com/journals/jcse/2017/7208241/ On the preliminary designing of a wide flat box girder with the slenderness ratio 12, vertical and torsional vortex-induced vibrations (VIV) are observed in wind tunnel tests. More than one lock-in region, which are defined as “multi-lock-in regions,” are recorded. Therefore, suspicions should be aroused regarding the viewpoint that wide box girders are aerodynamic friendly. As the three nascent vortexes originating at the pedestrian guardrails and inspection rails shed to near-wake through different pathways with different frequencies, the mechanisms of VIVs and multi-lock-in regions are analyzed to be determined by the inappropriate subsidiary structures. A hybrid method combining Large Eddy Simulation (LES) with experimental results is introduced to study the flow-structure interactions (FSI) when undergoing VIVs; the vortex mode of torsional VIV on wide flat box girders is defined as “4/2S,” which is different from any other known ones. Based on the mechanism of VIV, a new approach by increasing ventilation rate of the pedestrian guardrails is proved to be effective in suppressing vertical and torsional VIVs, and it is more feasible than other control schemes. Then, the control mechanisms are deeper investigated by analyzing the evolution of vortex mode and FSI using Hybrid-LES method. Bo Wu, Liangliang Zhang, Yang Yang, Lianjie Liu, and Haohong Li Copyright © 2017 Bo Wu et al. All rights reserved. An Efficient Quality-Related Fault Diagnosis Method for Real-Time Multimode Industrial Process Sun, 12 Mar 2017 07:53:09 +0000 http://www.hindawi.com/journals/jcse/2017/9560206/ Focusing on quality-related complex industrial process performance monitoring, a novel multimode process monitoring method is proposed in this paper. Firstly, principal component space clustering is implemented under the guidance of quality variables. Through extraction of model tags, clustering information of original training data can be acquired. Secondly, according to multimode characteristics of process data, the monitoring model integrated Gaussian mixture model with total projection to latent structures is effective after building the covariance description form. The multimode total projection to latent structures (MTPLS) model is the foundation of problem solving about quality-related monitoring for multimode processes. Then, a comprehensive statistics index is defined which is based on the posterior probability of the monitored samples belonging to each Gaussian component in the Bayesian theory. After that, a combined index is constructed for process monitoring. Finally, motivated by the application of traditional contribution plot in fault diagnosis, a gradient contribution rate is applied for analyzing the variation of variable contribution rate along samples. Our method can ensure the implementation of online fault monitoring and diagnosis for multimode processes. Performances of the whole proposed scheme are verified in a real industrial, hot strip mill process (HSMP) compared with some existing methods. Kaixiang Peng, Bingzheng Wang, and Jie Dong Copyright © 2017 Kaixiang Peng et al. All rights reserved. Fault-Tolerant Control of a Nonlinear System Actuator Fault Based on Sliding Mode Control Thu, 09 Mar 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/8595960/ This paper presents a fault-tolerant control scheme for a class of nonlinear systems with actuator faults and unknown input disturbances. First, the sliding mode control law is designed based on the reaching law method. Then, in view of unpredictable state variables and unknown information in the control law, the original system is transformed into two subsystems through a coordinate transformation. One subsystem only has actuator faults, and the other subsystem has both actuator faults and disturbances. A sliding mode observer is designed for the two subsystems, respectively, and the equivalence principle of the sliding mode variable structure is used to realize the accurate reconstruction of the actuator faults and disturbances. Finally, the observation value and the reconstruction value are used to carry out an online adjustment to the designed sliding mode control law, and fault-tolerant control of the system is realized. The simulation results are presented to demonstrate the approach. Jing He, Lin Mi, Songan Mao, Changfan Zhang, and Houguang Chu Copyright © 2017 Jing He et al. All rights reserved. Input-Output Finite-Time Control of Positive Switched Systems with Time-Varying and Distributed Delays Mon, 06 Mar 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/4896764/ The problem of input-output finite-time control of positive switched systems with time-varying and distributed delays is considered in this paper. Firstly, the definition of input-output finite-time stability is extended to positive switched systems with time-varying and distributed delays, and the proof of the positivity of such systems is also given. Then, by constructing multiple linear copositive Lyapunov functions and using the mode-dependent average dwell time (MDADT) approach, a state feedback controller is designed, and sufficient conditions are derived to guarantee that the corresponding closed-loop system is input-output finite-time stable (IO-FTS). Such conditions can be easily solved by linear programming. Finally, a numerical example is given to demonstrate the effectiveness of the proposed method. Leipo Liu, Xiangyang Cao, Zhumu Fu, and Shuzhong Song Copyright © 2017 Leipo Liu et al. All rights reserved. An Accelerating Iterative Learning Control Based on an Adjustable Learning Interval Thu, 02 Mar 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/1731676/ An iterative learning control algorithm with an adjustable interval is proposed for nonlinear systems to accelerate the convergence rate of iterative learning control. For -norm, the monotonic convergence of ILC was analyzed, and the corresponding convergence conditions were obtained. The results showed that the convergence rate was mainly determined by the controlled object, the control law gain, the correction factor, and the iteration interval size and that the control law gain was corrected in real time in the modified interval and the modified interval shortened as the number of iterations increased, further accelerating the convergence. The numerical simulation shows the effectiveness of the proposed method. Dongqi Ma and Hui Lin Copyright © 2017 Dongqi Ma and Hui Lin. All rights reserved. Energy Optimal Control Strategy of PHEV Based on PMP Algorithm Tue, 28 Feb 2017 07:40:34 +0000 http://www.hindawi.com/journals/jcse/2017/6183729/ Under the global voice of “energy saving” and the current boom in the development of energy storage technology at home and abroad, energy optimal control of the whole hybrid electric vehicle power system, as one of the core technologies of electric vehicles, is bound to become a hot target of “clean energy” vehicle development and research. This paper considers the constraints to the performance of energy storage system in Parallel Hybrid Electric Vehicle (PHEV), from which lithium-ion battery frequently charges/discharges, PHEV largely consumes energy of fuel, and their are difficulty in energy recovery and other issues in a single cycle; the research uses lithium-ion battery combined with super-capacitor (SC), which is hybrid energy storage system (Li-SC HESS), working together with internal combustion engine (ICE) to drive PHEV. Combined with PSO-PI controller and Li-SC HESS internal power limited management approach, the research proposes the PHEV energy optimal control strategy. It is based on revised Pontryagin’s minimum principle (PMP) algorithm, which establishes the PHEV vehicle simulation model through ADVISOR software and verifies the effectiveness and feasibility. Finally, the results show that the energy optimization control strategy can improve the instantaneity of tracking PHEV minimum fuel consumption track, implement energy saving, and prolong the life of lithium-ion batteries and thereby can improve hybrid energy storage system performance. Tiezhou Wu, Yi Ding, and Yushan Xu Copyright © 2017 Tiezhou Wu et al. All rights reserved. Iterative Learning Control with Forgetting Factor for Urban Road Network Tue, 28 Feb 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/9269187/ In order to improve the traffic condition, a novel iterative learning control (ILC) algorithm with forgetting factor for urban road network is proposed by using the repeat characteristics of traffic flow in this paper. Rigorous analysis shows that the proposed ILC algorithm can guarantee the asymptotic convergence. Through iterative learning control of the traffic signals, the number of vehicles on each road in the network can gradually approach the desired level, thereby preventing oversaturation and traffic congestion. The introduced forgetting factor can effectively adjust the control input according to the states of the system and filter along the direction of the iteration. The results show that the forgetting factor has an important effect on the robustness of the system. The theoretical analysis and experimental simulations are given to verify the validity of the proposed method. Tianyi Lan, Fei Yan, and Hui Lin Copyright © 2017 Tianyi Lan et al. All rights reserved. Parameters Design for Logarithmic Quantizer Based on Zoom Strategy Mon, 27 Feb 2017 08:16:43 +0000 http://www.hindawi.com/journals/jcse/2017/4028258/ This paper is concerned with the problem of designing suitable parameters for logarithmic quantizer such that the closed-loop system is asymptotic convergent. Based on zoom strategy, we propose two methods for quantizer parameters design, under which it ensures that the state of the closed-loop system can load in the invariant sets after some certain moments. Then we obtain that the quantizer is unsaturated, and thus the quantization errors are bounded under the time-varying logarithm quantization strategy. On that basis, we obtain that the closed-loop system is asymptotic convergent. A benchmark example is given to show the usefulness of the proposed methods, and the comparison results are illustrated. Jingjing Yan Copyright © 2017 Jingjing Yan. All rights reserved. Stabilizing a Rotary Inverted Pendulum Based on Logarithmic Lyapunov Function Mon, 27 Feb 2017 07:41:24 +0000 http://www.hindawi.com/journals/jcse/2017/4091302/ The stabilization of a Rotary Inverted Pendulum based on Lyapunov stability theorem is investigated in this paper. The key of designing control laws by Lyapunov control method is the construction of Lyapunov function. A logarithmic function is constructed as the Lyapunov function and is compared with the usual quadratic function theoretically. The comparative results show that the constructed logarithmic function has higher numerical accuracy and faster convergence speed than the usual quadratic function. On this basis, the control law of stabilizing Rotary Inverted Pendulum is designed based on the constructed logarithmic function by Lyapunov control method. The effectiveness of the designed control law is verified by experiments and is compared with LQR controller and the control law designed based on the quadratic function. Moreover, the system robustness is analyzed when the system parameters contain uncertainties under the designed control law. Jie Wen, Yuanhao Shi, and Xiaonong Lu Copyright © 2017 Jie Wen et al. All rights reserved. Nonlinear Control of Back-to-Back VSC-HVDC System via Command-Filter Backstepping Sun, 26 Feb 2017 11:42:03 +0000 http://www.hindawi.com/journals/jcse/2017/7410392/ This paper proposed a command-filtered backstepping controller to improve the dynamic performance of back-to-back voltage-source-converter high voltage direct current (BTB VSC-HVDC). First, the principle and model of BTB VSC-HVDC in and frame are described. Then, backstepping method is applied to design a controller to maintain the voltage balance and realize coordinated control of active and reactive power. Meanwhile, command filter is introduced to deal with the problem of input saturation and explosion of complexity in conventional backstepping, and a filter compensation signal is designed to diminish the adverse effects caused by the command filter. Next, the stability and convergence of the whole system are proved via the Lyapunov theorem of asymptotic stability. Finally, simulation results are given to demonstrate that proposed controller has a better dynamic performance and stronger robustness compared to the traditional PID algorithm, which also proves the effectiveness and possibility of the designed controller. Jie Huang, Dezhi Xu, Wenxu Yan, Le Ge, and Xiaodong Yuan Copyright © 2017 Jie Huang et al. All rights reserved. Fault Diagnosis Method Based on Information Entropy and Relative Principal Component Analysis Mon, 20 Feb 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/2697297/ In traditional principle component analysis (PCA), because of the neglect of the dimensions influence between different variables in the system, the selected principal components (PCs) often fail to be representative. While the relative transformation PCA is able to solve the above problem, it is not easy to calculate the weight for each characteristic variable. In order to solve it, this paper proposes a kind of fault diagnosis method based on information entropy and Relative Principle Component Analysis. Firstly, the algorithm calculates the information entropy for each characteristic variable in the original dataset based on the information gain algorithm. Secondly, it standardizes every variable’s dimension in the dataset. And, then, according to the information entropy, it allocates the weight for each standardized characteristic variable. Finally, it utilizes the relative-principal-components model established for fault diagnosis. Furthermore, the simulation experiments based on Tennessee Eastman process and Wine datasets demonstrate the feasibility and effectiveness of the new method. Xiaoming Xu and Chenglin Wen Copyright © 2017 Xiaoming Xu and Chenglin Wen. All rights reserved. Guaranteed Cost Finite-Time Control for Positive Switched Linear Systems with Time-Varying Delays Sun, 19 Feb 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/7051658/ This paper considers the guaranteed cost finite-time control for positive switched linear systems with time-varying delays. The definition of guaranteed cost finite-time boundedness is firstly given. Then, by using the mode-dependent average dwell time approach, a static output feedback law and a state feedback control law are constructed, respectively, and sufficient conditions are obtained to guarantee that the closed-loop system is guaranteed cost finite-time boundedness. Such conditions can be easily solved by linear programming. Finally, an example is given to illustrate the effectiveness of the proposed method. Xiangyang Cao, Leipo Liu, Zhumu Fu, Xiaona Song, and Shuzhong Song Copyright © 2017 Xiangyang Cao et al. All rights reserved. On Modeling and Constrained Model Predictive Control of Open Irrigation Canals Tue, 14 Feb 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/6257074/ This paper proposes a model predictive control of open irrigation canals with constraints. The Saint-Venant equations are widely used in hydraulics to model an open canal. As a set of hyperbolic partial differential equations, they are not solved explicitly and difficult to design optimal control algorithms. In this work, a prediction model of an open canal is developed by discretizing the Saint-Venant equations in both space and time. Based on the prediction model, a constrained model predictive control was firstly investigated for the case of one single-pool canal and then generalized to the case of a cascaded canal with multipools. The hydraulic software SICC was used to simulate the canal and test the algorithms with application to a real-world irrigation canal of Yehe irrigation area located in Hebei province. Lihui Cen, Ziqiang Wu, Xiaofang Chen, Yanggui Zou, and Shaohui Zhang Copyright © 2017 Lihui Cen et al. All rights reserved. Exponential Synchronization for Second-Order Nodes in Complex Dynamical Network with Communication Time Delays and Switching Topologies Mon, 13 Feb 2017 11:04:45 +0000 http://www.hindawi.com/journals/jcse/2017/7836316/ This paper is devoted to the study of exponential synchronization problem for second-order nodes in dynamical network with time-varying communication delays and switching communication topologies. Firstly, a decomposition approach is employed to incorporate the nodes’ inertial effects into the distributed control design. Secondly, the sufficient conditions are provided to guarantee the exponential synchronization of second-order nodes in the case that the information transmission is delayed and the communication topology is balanced and arbitrarily switched. Finally, to demonstrate the effectiveness of the proposed theoretical results, it is applied to the typical second-order nodes in dynamical network, as a case study. Simulation results indicate that the proposed method has a high performance in synchronization of such network. Miao Yu, Weipeng Shang, and Zhigang Chen Copyright © 2017 Miao Yu et al. All rights reserved. Stowage Plan Based Slot Optimal Allocation in Rail-Water Container Terminal Mon, 13 Feb 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/5489597/ To obtain an efficient and reasonable solution for slot allocation in rail-water container terminals, this paper develops storage optimal allocation model 1 to improve the yard space utilization, which is solved by a heuristic algorithm based on Tabu search. Model 2 is then built to reduce the relocation movements. A concept of fall-down problem in shunting operation plan is thus proposed to solve model 2. Models 1 and 2 are tested with numerical experiments. The results show that the yard space utilization increases by 50% approximately compared to the strategy of one train piling onto a fixed area called a subblock. Meanwhile the number of container relocation movements is less than five when using the fall-down problem strategy. Accordingly, the models and algorithms developed in this paper are effective to improve the yard space utilization and reduce the number of container relocation movements. Yanjing Li, Xiaoning Zhu, Li Wang, and Xi Chen Copyright © 2017 Yanjing Li et al. All rights reserved. Detection of Intermittent Fault for Discrete-Time Systems with Output Dead-Zone: A Variant Tobit Kalman Filtering Approach Tue, 07 Feb 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/7849841/ This paper is concerned with the intermittent fault detection problem for a class of discrete-time linear systems with output dead-zone. Dead-zone phenomenon exists in many real practical systems due to the employment of low-cost commercial off-the-shelf sensors. Two Bernoulli random variables are utilized to model the dead-zone effect and a variant formation of Tobit Kalman filter is brought forward to generate a residual that can indicate the occurrence of an intermittent fault. A numerical example is presented to demonstrate the effectiveness and applicability of the proposed technique. The statistical performance of the technique is illustrated as well. Jie Huang and Xiao He Copyright © 2017 Jie Huang and Xiao He. All rights reserved. Two-Layer Linear MPC Approach Aimed at Walking Beam Billets Reheating Furnace Optimization Tue, 31 Jan 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/5401616/ In this paper, the problem of the control and optimization of a walking beam billets reheating furnace located in an Italian steel plant is analyzed. An ad hoc Advanced Process Control framework has been developed, based on a two-layer linear Model Predictive Control architecture. This control block optimizes the steady and transient states of the considered process. Two main problems have been addressed. First, in order to manage all process conditions, a tailored module defines the process variables set to be included in the control problem. In particular, a unified approach for the selection on the control inputs to be used for control objectives related to the process outputs is guaranteed. The impact of the proposed method on the controller formulation is also detailed. Second, an innovative mathematical approach for stoichiometric ratios constraints handling has been proposed, together with their introduction in the controller optimization problems. The designed control system has been installed on a real plant, replacing operators’ mental model in the conduction of local PID controllers. After two years from the first startup, a strong energy efficiency improvement has been observed. Silvia Maria Zanoli and Crescenzo Pepe Copyright © 2017 Silvia Maria Zanoli and Crescenzo Pepe. All rights reserved. Optimal Sensor Communications in Presence of Transmission Delays and Bandwidth Limitations Tue, 31 Jan 2017 00:00:00 +0000 http://www.hindawi.com/journals/jcse/2017/4015143/ In a distributed sensor (and actuator) network, several sensors may be lumped to a single transmitter or communicate via a remote terminal unit. Due to bandwidth limitations in the network, the transmitter/remote terminal should decide on the communication sequence according to which it sends sensor data. This decision must be based on an appropriate performance criterion. In this paper, we formulize this problem and propose a convex optimization scheme to optimize the estimation variance via choosing the most appropriate communication sequence. The derived communication sequence is then used for designing a Kalman filter to estimate states of the underlying system. Both cases of Zero-Order Hold and Reset To Zero output policies are investigated and compared in the simulation. M. M. Share Pasand and M. Montazeri Copyright © 2017 M. M. Share Pasand and M. Montazeri. All rights reserved. Intelligent Vehicle Embedded Sensors Fault Detection and Isolation Using Analytical Redundancy and Nonlinear Transformations Mon, 16 Jan 2017 08:34:40 +0000 http://www.hindawi.com/journals/jcse/2017/1763934/ This work proposes a fault detection architecture for vehicle embedded sensors, allowing to deal with both system nonlinearity and environmental disturbances and degradations. The proposed method uses analytical redundancy and a nonlinear transformation to generate the residual value allowing the fault detection. A strategy dedicated to the optimization of the detection parameters choice is also developed. Nicolas Pous, Denis Gingras, and Dominique Gruyer Copyright © 2017 Nicolas Pous et al. All rights reserved. Research on Fault Diagnosis Method Based on Rule Base Neural Network Thu, 12 Jan 2017 11:08:02 +0000 http://www.hindawi.com/journals/jcse/2017/8132528/ The relationship between fault phenomenon and fault cause is always nonlinear, which influences the accuracy of fault location. And neural network is effective in dealing with nonlinear problem. In order to improve the efficiency of uncertain fault diagnosis based on neural network, a neural network fault diagnosis method based on rule base is put forward. At first, the structure of BP neural network is built and the learning rule is given. Then, the rule base is built by fuzzy theory. An improved fuzzy neural construction model is designed, in which the calculated methods of node function and membership function are also given. Simulation results confirm the effectiveness of this method. Zheng Ni, Zhang Lin, Wang Wenfeng, Zhang Bo, Liu Yongjin, and Zhang Dajiang Copyright © 2017 Zheng Ni et al. All rights reserved.