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In this paper there are presented a series of dynamic regimes obtained for the case when some disturbances occur during the operation of a reluctance synchronous motor operation: the decrease of the sinusoidal supply voltage value and the supply by a non-sinusoidal source of voltage (indirect voltage and frequency converter voltage source with PWM command and voltage inverter with pre-computed moments...
In this paper, the authors present the analysis by Finite Element Method software packages of optimization of a permanent magnet synchronous motor with low speed, used to drive a bicycle. Advanced licensed software CAD/CAM/CAE were used for modelling and simulation of electromagnetic field, ANSYS Electromagnetics Low Frequency (Maxwell 2D/3D, RMxprt) - products of ANSYS Inc. There are presented some...
The rapidly growing of the world's population makes efficient Healthcare System (HS) management more and more important to all stakeholders, from patients and healthcare providers, to insurance companies and governments. The use of advanced information and networking technologies to advance health care management has long been recognized as the most effective way. Hence, healthcare organizations are...
A contemporary governance challenge for governments concerns the biogas domain: what incentives and policies can lead to a viable biogas economy? To support addressing this challenge, a prototype of a simulator is constructed in which horizontal governance is applied in a multi-stakeholder context. This paper reports on the modelling and knowledge acquisition that led to the development of that prototype...
In this paper, the switching flow-graph models are developed to study the nonlinear behavior of DC-DC switching converters. Based on the concept of virtual switches and virtual switching functions, switching flow-graph (SFG) model are created easily without complex mathematics. The SFG modeling technique is helpful for undergraduate students or beginners to understand how the switching converters...
Three-phase converter systems can be prone to negative impedance instability of the DC-bus. This paper studies the dynamic interactions between the DC- and AC-sides of a current-controlled three-phase system in order to reveal possible risks of instability. The system is modelled by using a small-signal method from a viewpoint of the DC-side. Time delays due to pre-calculation and discretization are...
Critical infrastructure's (CI) (electricity, heat, water, information and communication technology networks) security, stability and reliability are closely related to the interaction phenomenon. Due to the increasing amount of data transferred, increases dependence on telecommunications and internet services, the data integrity and security is becoming a very important aspect for the utility services...
Dispatch reliability is not only a top-level parameter characterizing the civil aircraft reliability, but also one of the most important parameters for evaluating the operational efficiency of aircraft and fleet, which is employed by the International Air Transport Association (IATA). As an integrated measure influenced by aircraft inherent reliability, operating environment and ground support capability...
The present paper proposes a Fluid Stochastic Petri Nets based model, with a flexible and modular structure, to represent the behavioural characteristics and possible interactions among the controlled Micro Hydro Power units in a run of the river chain. Environmental influences were embedded, the final goal of the proposed modelling method being to simulate the dynamicity of the hydrographic assembly...
This paper summarizes electro-thermal coupled analysis modeling methods. Two models of influence of temperature-dependent materials on mathematical modelling are presented together with two modelling methods of heat transmission through the air gap. Mathematical models are compared with measurement accomplished on an induction machine available on the market.
Paper describes the creation of mathematical model for active damped mechanical structure. The model is consisting of differential equations for structure's motion and an equation of the control loop. This model is used to design and examination the control loop algorithm and for testing the behaviour of the whole system before applying it on the real structure.
This paper presents a survey on model-driven design and validation approaches for distributed automation and control systems with essentially decentralized logic. Driven by the goals of flexibility and performance improvement, researchers have explored several approaches to distributed systems design, including multiagent systems, middleware, and distributed component architectures. This also results...
Switched reluctance motor (SRM) drives have gained many attentions from researcher which will be used for automotive applications that needs high speed, wider range of constant power capability, ruggedness, and fault tolerance. This paper focuses on modelling and simulation of switched reluctance motor (SRM) based on COMSOL software, two dimensional finite element models of SRM were developed and...
The purpose of the study is to analyze the configurations of Plug-in Hybrid Electric Vehicles (PHEV) with respect to fuel economy. Existing studies mostly focus on hybrid systems or few PHEV systems by only considering power split ratio and component efficiency. This paper adds original contribution to these literatures. First of all, this study compares and analyzes “series + α” PHEV — Input split,...
Worldwide fuel consumption regulations are becoming more and more stringent. As a result, car companies are looking at a wide portfolio of component technologies, including engines, transmissions, and electrification. This study examined fuel consumption reductions offered by a collection of advanced spark-ignition (SI) engine technologies using full-vehicle simulations. High-fidelity engine models...
Modelling and simulation have become inseparable activities in any applied science or engineering research and development endeavour. The nature of inseparability is even more evident in the case of the automotive industry. Adding to the modelling complexity are the electric vehicles with a rich interplay of previously well demarcated disciplines of electrical-electronics engineering and mechanical-automotive...
A parallel type HEV (Hybrid Electric Vehicle) has a power transfer device that is constructed by wet clutches and the device is called ‘Engine Clutch’. The Engine Clutch is located between engine and electric traction motor so it transfers power of engine when the engine is started and clutches are engaged or cut the power when regenerative braking is occurred. When a traction motor of a parallel...
This paper proposes a Session Initiation Protocol (SIP) message classification and prioritization scheme. This three-priority classification of SIP messages is implemented in Internet protocol Multimedia Subsystem (IMS). Its effectiveness is verified through the analytical and simulation modelling of IMS using a queuing theory. The proposed IMS model is analysed in the normal load and overload conditions...
This paper presents a proposed design of a leg rehabilitation system. The system will be implemented on a reconfigurable wheelchair prototype in order to provide additional two rotational degrees of freedom (DOF) for serving more rehabilitation purposes. Lagrangian dynamic formulation is used to derive the system dynamics. Joints frictions based on Coulomb friction model are considered in the leg...
In this paper, modelling and simulation of RKX200 rocket flight dynamics are presented. The dynamics model is constructed by first-principle method based on forces and moments acting the rocket rigid body. In the development of the model, the aerodynamics coefficients are determined by using missile DATCOM software. A six Degree of Freedom (DoF) nonlinear model, as well as linear decoupled longitudinal...
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