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This paper deals with the design, modeling and control of a Tidal Stream Generator (TSG) system including a tidal turbine, a rotor shaft and a Doubly Fed Induction Generator (DFIG). Below high tidal speed the system is regulated so that for every tidal velocity reaches the maximum power. A rotational speed control based-Maximum Power Point Tracking (MPPT) for a TSG is investigated to provide the suitable...
In this paper, the direct approach which was introduced for the first time by [Rotella and Zambettakis, 2011] in designing minimal functional state observers is extended to deal with discrete-time systems. One of the benefits of this approach is that it does not require solving the Sylvester matrix equation that appears in other observer design procedures. Both stable observers and arbitrary fixed...
Access control is an important issue in multi-domain information systems. A variety of access control models have been developed to address different aspects of security problems in such systems. Currently, the two most popular models are role-based access control (RBAC) and Attribute-based access control (ABAC). Providing a hybrid model which considers both the “role” concept and the “attributes”...
This paper presents a study of speed sensorless vector control of an induction machine (IM), fed by a pulse width inverter using observers. The control strategy used is an indirect control by rotor flux oriented with proportional-integral PI controllers. The parameters of these controllers are calculated directly from the machine settings using conventional analytical methods, which require careful...
Based on vector norms approach, this paper addresses the problem of stability under arbitrary switching of nonlinear discrete-time switched systems with constant time-delay using TS fuzzy models. The idea consists in constructing an overvaluing system, common to all fuzzy subsystems and whose stability permits to conclude to that of the original system.
The paper discusses about the possibilities of Cyber-Physical Systems (CPS) and cloud technology in maintenance. Fairly new sensor solutions that could be used in maintenance and in interaction with CPS are also presented. Data models are important part of condition based maintenance (CBM) because the huge amount of data that is produced and thus also Machinery Information Management Open System Alliance...
The article presents development and analysis of hybrid path planning systems for vehicles. Two types of planner structures were defined. In the first type of systems several basic path planning methods operate together. In the systems of the second type parameters and initial data of one basic method are modified by additional algorithms. We developed a controller that solves positioning and path-following...
Train integrity monitoring is one of the key aspects to enable cheaper, safer and more reliable modern railway signaling system. The proposed Train Integrity Monitoring System is based on a WSN, which consist of the WSN Nodes (deployed on each wagon), the Coordinator and the Serial Gateway (both deployed on a locomotive). Each WSN Node measures accelerometer and GPS data, which are further send to...
We address the flow-shop scheduling problem with two machines and time delays in order to minimize the makespan, i.e, the maximum completion time. We propose an exact algorithm based on a branch-and-bound enumeration scheme, for which we introduce a heuristic method based on a local search technique and three dominance rules. Finally, we present a computer simulation of the branch-and-bound algorithm,...
Ventilation systems operate at buildings level for enhancing air quality by injecting fresher air from outside into inside buildings. In many situations, occupants have to open doors or windows in order to get fresh air. However, in cold or hot periods, or when there are no windows, ventilation systems automatically act on behalf of occupants by insuring good indoor air quality. More precisely, the...
The article addresses the problem of controlling a vehicle in an undetermined 3D environment with mobile and stationary obstacles. We propose a two-level system performing planning and path-following. The path planning problem is split into the problem of planning and following global paths-missions and the problem of local planning in an obstructed area. The global path is built based on a priory...
The control of critical electronic components reliability is one of the main issues in railway traction applications. Insulated Gate Bipolar Transistors (IGBT) modules are part of these components. They are subjected to high stresses due to severe conditions of use of the train. The increase of requirements in terms of reliability and safety imposes to be able to assess these dependability measures...
SCADA (Supervisory Control and Data Acquisition) system is the core component of industrial and critical infrastructure, and cyber security of SCADA system has become the key consideration of system managers and engineers. Therefore, a great many of standards, guidelines and best practices have been developed to give reference of SCADA system cyber security, hoping to provide some instructions for...
Actuators based on piezoelectric material have attracted much attention owing to their compact construction, large force generation, high precision, wide operating frequency range, fast response, and low power consumption. Their domain of applications is wide and keeps expanding. One of the mostly widely used types of these actuators is the amplified piezoelectric actuator (APA). APAs have been used...
The Internet of Things (IoT) has gained a significant attention in the last years. It covers multiple domains and applications such as smart home, smart healthcare, IT transportation…etc. The highly dynamic nature of the IoT environment brings to the service discovery new challenges and requirements. As a result, discovering the desirable services has become very challenging. In this paper, we aim...
This paper introduces a Load Frequency Control (LFC) of the uncertain isolated non-reheat power system using L1 adaptive control technique. This L1 adaptive control technique, online, is successfully used for fast estimation of parametric uncertainty of the system plant that generates LFC. This estimated parametric uncertainty designed in adaptive controller scheme in order to achieve robust balance...
In order to prolong the lifetime of wireless sensor networks, we have to optimize the energy consumption at the sensor nodes. Thereby, most research works have focused on how to increase the duration of sleeping states of sensor nodes using various wakeup strategies. In this paper, we propose to model the sleep/wakeup pattern of networked nodes with different vacation policies using the Generalized...
We propose a virtualization architecture for multi-campus information and communication technology (ICT) equipment with integrated cloud and NFV capabilities. The aim of this proposal is to migrate most ICT equipment on campus premises into cloud and NFV platforms. Adopting this architecture would make most ICT services secure and reliable and their disaster recovery (DR) economically manageable....
Increasing number of cancer survivors besides efficient medications render demand for cancer service care dramatically increasing. Hence, stakeholders have to investigate new ways in order to enhance cancer treatment operational performance. Outpatient chemotherapy management is a complex problem due to large variability in treatment times as a result of the different cancer types and thus different...
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