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ISA Transactions

Xingyang Lu, Xiangyin Zhang, Guoliang Zhang, Jinhui Fan, Songmin Jia
This paper presents a novel neural network adaptive sliding mode control (NNASMC) method to design the dynamic control system for an omnidirectional vehicle. The omnidirectional vehicle is equipped with four Mecanum wheels that are actuated by separate motors, and thus has the omnidirectional mobility and excellent athletic ability in a narrow space. Considering various uncertainties and unknown external disturbances, kinematic and dynamic models of the omnidirectional vehicle are established. The inner-loop controller is designed based the sliding mode control (SMC) method, while the out-loop controller uses the proportion integral derivative (PID) method...
November 3, 2018: ISA Transactions
Guolian Hou, Linjuan Gong, Congzhi Huang, Jianhua Zhang
In order to satisfy the growing demands of control performance and energy conservation in power generation process, a novel T-S fuzzy modeling method combined with the quantum artificial bee colony (QABC) algorithm is proposed and applied to the coordinated control system (CCS) of ultra-supercritical unit in 1000MW power plant. The T-S fuzzy modeling consists of the identifications of premise part and consequence part. In the premise part identification, the cluster number and initial cluster centers are obtained at first by using entropy-based clustering method...
November 3, 2018: ISA Transactions
Kaushik Halder, Debayan Bose, Amitava Gupta
The lifted sample-time approach has been extensively applied to analyze the behavior of a Networked Control System (NCS) under instances of packet-drop and/or variable communication latency (jitter) of varying durations. This paper combines the simplicity of the lifted sample-time approach in modeling an NCS under arbitrary but bounded instances of packet-drop and/or jitter with the proven L2 induced norm based approach of controller design to realize an NCS which is capable of preserving the designed value of the norm under assumed conditions of packet-drop and/or jitter and hence a satisfactory time response under these conditions...
November 3, 2018: ISA Transactions
Dong Xu, Zhiyu Lv, Haining Zeng, Hadjar Bessaih, Bing Sun
Artificial lateral line is a multi-sensor system, mimicking the lateral line of fish to perceive the parameters of flow field. However, it can easily lead to information loss or redundancy with limited number of sensors due to unsuitable sensor placement. An optimal weight analysis algorithm is proposed to solve the problem on sensor placement of robotic fish. Firstly, signal features are extracted from the pressure data, which are collected from candidate sensor locations in different conditions. Then the improved distance evaluation is used to assess each feature, and the feature distance factor is regarded as the weight for distinguishing...
November 3, 2018: ISA Transactions
Shyam Kamal, Ankit Sachan, D Kranthi Kumar, Devender Singh
This paper studies the formation of multiple mobile agents with double integrator dynamics and their target tracking. An algorithm consisting of an observer and a feedback control law of the nonsmooth type is proposed for the purpose of achieving finite-time formation and target tracking. The development is based on the Multi-input Multi-output (MIMO) super-twisting like approach aiming at finite time convergence without chattering. In addition to the formation; tracking, chattering prevention and robustness is also provided by the sliding mode mechanism which is demonstrated by simulations...
November 2, 2018: ISA Transactions
Mohsen Bahreini, Jafar Zarei
This paper focuses on the problem of fault-tolerant controller (FTC) design for uncertain networked control systems (NCSs) with random delays and actuator faults. A new fault model is proposed to represent more class of actuator faults. More precisely, the NCSs with random delays and the possible actuator faults are modeled as a Markovian jump system (MJS) with incomplete transition probabilities (TPs) and then LMI-based sufficient conditions are derived to ensure the stochastic stability of the closed-loop system...
October 30, 2018: ISA Transactions
Bilal Şenol, Uğur Demiroğlu
This study proposes an analytical design method of fractional order proportional integral (FOPI) controllers for first order plus time delay (FOPTD) systems. Suggested technique obtains the general computation equations of controllers for such systems. These equations are used to tune controller parameters to meet specified frequency and phase properties to satisfy the stability of whole system. It is found that the designed controllers not only make the system stable, but also have positive effect on the performance and robustness of the system...
October 30, 2018: ISA Transactions
Zhen Tian, Jingqi Yuan
The sliding mode control (SMC) approach has been extensively studied and applied owing to its excellent performance and inherent robustness. However, it could hardly address the mismatched uncertainties because of its structural limitation. In this paper, a chattering-free sliding mode control approach based on an uncertainty and disturbance estimator (UDE) is proposed for a class of nonlinear systems with mismatched uncertainties. The UDE is designed for the estimation of both matched and mismatched uncertainties, which only requires the spectrum of the lumped uncertainties...
October 30, 2018: ISA Transactions
Guoqing Zhang, Baijun Tian, Weidong Zhang, Xianku Zhang
In this work, a novel optimized robust control algorithm, based on the mirror-mapping method, is proposed for a class of industrial unstable process with time delay. The optimizing criterion is to minimize the sensitivity function to enhance its robustness. The controllers are designed based on the Padé approximated mirror-mapping process with a stable form, other than the original unstable system. The developed algorithm could release the internal stability constraints to the unstable plant. By using the graphical stability criterion, a systematic methodology is derived to obtain the exact stabilizing region, where the sole design parameter is related to the stability degree of the closed-loop system...
October 30, 2018: ISA Transactions
Jingang Lai, Xiaoqing Lu, Ruo-Li Tang, Xin Li, Zhengcheng Dong
With increasing penetration of variable loads and intermittent distributed energy resources (DERs) with uncertainty and variability in distribution systems, the power system gradually inherits some features (e.g., lack of rotating inertia), which leads to the voltage instability in microgrids. As a means to provide stability support for smart grid against high penetration of intermittent DERs, inverter-based smart loads across the distribution grid has been suggested recently. Accordingly, this paper presents a delay-tolerant distributed voltage control scheme based on consensus protocol for multiple-cooperative smart loads through effective demand-side management in ac microgrids, in which the time-delay effect on transmission communication occurred in information exchanges is considered...
October 30, 2018: ISA Transactions
Shuang Cai, Ahmet Palazoglu, Laibin Zhang, Jinqiu Hu
Industrial alarm systems play an essential role for the safe management of process operations. With the increase in automation and instrumentation of modern process plants, the number of alarms that the operators manage has also increased significantly. The operators are expected to make critical decisions in the presence of flooding alarms, poorly configured and maintained alarms and many nuisance alarms. In this environment, if the incoming alarms can be correctly predicted before they actually occur, the operators may have a chance to address and possibly avoid abnormal behaviors by taking corrective actions in time...
October 30, 2018: ISA Transactions
Ramzi Ben Messaoud
A new observer design for nonlinear systems is considered. The main idea consist of the determination of the estimation error and mean value theorem parameters (β) to introduce them into proposed observer structure. This process is designed on basis of mean value theorem (MVT) and Particle Swarm Optimization algorithm (PSO). This observer does not use Linear Matrix Inequality technique (LMI) for stability study. The stability study relies on the use of a classical quadratic Lyapunov function. The observer's gains are determined systematically...
October 30, 2018: ISA Transactions
Anuli Dass, Smriti Srivastava
Fuzzy logic based systems are very widely used for modeling and control of complex non-linear, plants. Fuzzy systems require the knowledge about the structure of the dynamic plant in order to achieve fruitful results. Recurrent Fuzzy systems (RFS) are a variation of fuzzy systems and have the ability to model and control dynamic plants without using the information about the structure of the plant. This paper presents identification and control of non-linear dynamical systems using two different architectures of recurrent fuzzy system (RFS)...
October 30, 2018: ISA Transactions
Ahlad Kumar, M Omair Ahmad, M N S Swamy
Recently, sparse representation has attracted a great deal of interest in many of the image processing applications. However, the idea of self-similarity, which is inherently present in an image, has not been considered in standard sparse representation. Moreover, if the dictionary atoms are not constrained to be correlated, the redundancy present in the dictionary may not improve the performance of sparse coding. This paper addresses these issues by using orthogonal moments to extract the correlations among the atoms and group them together by extracting the characteristics of the noisy image patches...
October 29, 2018: ISA Transactions
Wenjia Wang, Chuanjiang Li, Yanchao Sun, Guangfu Ma
This paper investigates the distributed coordinated attitude tracking control problem for spacecraft formation with time-varying communication delays under the condition that the dynamic leader spacecraft is a neighbor of only a subset of follower spacecrafts. We consider two cases for the leader spacecraft: i) the attitude derivative is constant, and ii) the attitude derivative is time-varying. In the first case, a distributed estimator is proposed for each follower spacecraft by using its neighbors' information with communication delays...
October 27, 2018: ISA Transactions
Bing Huang, Ai-Jun Li, Yong Guo, Chang-Qing Wang
This paper investigates the anti-unwinding finite-time attitude synchronization control problem for Spacecraft formation flying with external disturbances. Two finite-time controllers are designed based on rotation matrix and terminal sliding mode method. By designing a novel sliding mode surface, the first controller is developed when the upper bound of the external disturbances can be exactly known. However, this value is not always available in reality. In addition, the direct use of the upper bound of the external disturbances can result in the chattering problem...
October 27, 2018: ISA Transactions
Zhigang Ren, Zhongcheng Zhou, Chao Xu, Zongze Wu, Tehuan Chen
In this paper, we consider a bilinear optimal control problem arising in a one-dimensional (1-D) MHD flow modeled by an array of coupled partial differential equations (PDEs). The external control input (external induction of magnetic field) in the model takes the multiplicative effect on both state variables (i.e., momentum and magnetic components). Our aim is to drive the flow velocity to within close proximity of a desired target flow velocity at the pre-indicated terminal time. We first use the Galerkin method combined with a set of basis quadratic B-spline functions to obtain a semi-discrete approximation problem...
October 26, 2018: ISA Transactions
Yaowei Sun, Jun Zhao
A framework of regional passivity theory for switched systems is set up using multiple barrier storage functions. The "energy" stored in each subsystem is described by the corresponding individual barrier storage function which is only well defined on an open region associated with regional passivity. The key feature is that the "energy" grows to infinity when the trajectory tends to the region boundary. Firstly, a sufficient condition guaranteeing regional passivity for a switched system is derived under the designed switching law, where all subsystems are not assumed to be regionally passive...
October 25, 2018: ISA Transactions
Haiyue Zhu, Chee Khiang Pang, Tat Joo Teo
High-frequency resonant modes appearing in the flexure-based motion systems are the key factors that limit the motion/positioning performance. This paper presents an approach to design the fixed-order (low-order) controller for the flexure-based motion system, which is used for industrial optical fibre transceiver alignment and assembly. The uniqueness of the proposed algorithm is that one single controller can simultaneously stabilize the uncertain high-frequency resonant modes for both x and y-axis motion...
October 24, 2018: ISA Transactions
Liangming Chen, Chuanjiang Li, Bing Xiao, Yanning Guo
To improve the concurrency of leaders' formation and followers' containment, a difficult problem of designing the formation controller and the containment controller simultaneously should be addressed for networked systems. Motivated by this, this paper presents an even-triggered control framework for networked Euler-Lagrange systems to achieve formation-containment control even in the presence of uncertain parameters. An event-triggered formation controller is firstly designed for leaders to achieve the desired configuration...
October 24, 2018: ISA Transactions
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