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Interest paid lately to brushless direct current motors made the researches regarding the optimum design and construction of these motors to be very present. The study carried out, by the simulations we presented, shows that these motors have high torque oscillations in a complete rotation. There are identified the slots which create high torques, respectively low torques, in a complete rotation,...
This paper deals with an analog circuit which identifies the largest element in a list of data encoded in the input currents. The circuit is of Winner-Take-All type, a well-known function in artificial neural networks. Thus the “Winner” cell “competes” with the other candidates, after a processing time being the only active cell. This circuit is made of MOS transistors operating in subthreshold, an...
This paper presents a procedure to optimize the structure of the two magnetic coupled coils used in the wireless power transfer systems (WPTS's). The optimization of the two magnetic coupled coils is performed in function of the alignment coils. There are two forms of deviation in the alignment of coils — the lateral displacement and the angular displacement. In the lateral displacement, the two coils...
This paper presents a study of the frequency splitting and bifurcation phenomena in the wireless power transfer systems. Using electric circuit model methods and mathematical calculus, the two phenomena are analyzed for all the possible configurations of the coupled circuits, i.e. seriesseries, series-parallel, parallel-series and parallel-parallel. For a specific case including two identical printed...
In the context of the implementation of Directive 2013/35/EU, this paper addresses some specific aspects of occupational and non-occupational exposure in distinct situations. There is covered the shipboard personnel exposure to magnetic fields produced by the onboard power plant and ship propulsion system and to radiofrequency fields produced by communications and radar stations. In addition, it is...
In the last decades, the interest of researchers and public regarding the effects of electromagnetic field on living beings and in particular on humans has increased more and more. Scientific studies have sought to establish exposure limits for the general public and workers exposed to intense fields due to occupational environments in which they operate. This paper addresses the problem of power...
Environment concerns have gained more and more prevalence in the past decades, as better data and alarming prognosis regarding energy efficiency emerge from research. The private business sector already started to join the efforts with participation from both large companies and SMEs. Nowadays, in order to reduce energy costs and avoid penalties, companies concern themselves with an efficient use...
The approach and landing are the riskiest phases of flight and the probability of catastrophic accidents are rising due to reduced visibility in airport area. For increasing the safety and reliability of the aircraft at the approach and landing phase the Instrument Landing System, Precision Approach Radar, Microwave Landing System and Satellite Landing System can be used at instrument meteorological...
This paper analyzes the possibility of an improved landing stabilization by using Dynamic Matrix Control. In this purpose a new control structure is proposed based on the DMC algorithm. The model used to illustrate the structure is that of a stabilized aircraft during its last phase of landing. Simulations are performed for a variety of design parameters (prediction horizons, control horizons and...
The paper applies the diagnosis method based on the analytic model by investigating the output waveforms of the currents and voltages specific to a rectifier in a driving system. The direction is interesting due to the multitude of the measuring points and large number of possible faults to be analyzed. The method based on analytic models can be applied and the system behavior can be compared with...
The trend of generating power at distribution voltage level, known as distributed generation, is thought to be the future of energy generation, as it is environmental friendly and brings many advantages especially for electricity consumers. The paper presents the study of a real Romanian weak distribution network; the microgrid, comprising a transformer and the associated feeders, supplies single-...
Two types of Power Quality Monitoring Systems (PQMSs) — one for TSO and other for DSOs, in accordance with Performance standards and Technical Codes of the Romanian Energy Regulation Authority — ANRE were published. The connection to the grid of the renewable sources could determine the increasing of the emissivity of perturbations and the necessity of the propagation study in order to determine the...
This paper proposes a novel optimal reactive power dispatch model based on genetic algorithms, utilizing a comparative study on selection methods: roulette-wheel selection and rank selection. Performance of individuals is evaluated based on load flow solutions. A mixed current-power mismatch method is utilized for load flow calculation. The effectiveness of the proposed algorithm for solving the ORPD...
Retrofit solution for public lighting systems is given by replacing old lighting luminaires and / or old lighting lamps with improved solutions in terms of the lighting and electrical energy consumption lower than existing systems. Choosing a retrofit solution with changing lighting columns and retaining existing sites does not always lead to compliance with performance criteria standard for street...
Wave energy is an important renewable source of electricity that can be exploited. The reliability is an important issue for these energy converters due to the fact that they must be installed in harsh environments. The paper presents a reliability analysis of the linear generator type wave energy converters and shows the impact of the environment on the components of these devices.
Bayesian networks, known as belief or causal networks also, exploded in last decade as a convenient method used in different domains: medical diagnosis, availability and reliability studies, risk analysis, decision procedures, map learning, etc. This paper is mainly dedicated to the first step in using belief networks consisting in real technical systems formalization as Bayesian networks. This step...
The paper refers to the equipment for the espresso production process and some possibilities to increase the quality of the final product by implementing an adjustable tamping process. At present, the parameters of the extraction process are adjusted manually and the variation of the external factors change the quality of coffee beans. The implementation for the adjustable electromechanical system...
The paper presents the design and some results for an experimental platform aimed to control the air pressure inside a small tank. The basic idea is to allow to the control algorithm to select an appropriate characteristic of the controller driving the air compressor, from an available set. In this first approach, the goal is to make functional the hardware circuits and to design the software support...
The paper deals with a hardware solution for the study of low power active filter with Bode plotting. By using a DAQ card and an experimental platform it shows how LabVIEW graphical programming environment can be used for manual or automated testing and analysis of the first order active filter with operational amplifier (op-amp). The hardware platform can provide a template to build real op-amp circuits...
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