7,474 research outputs found
A Bluetooth Solution for Public Information Systems
No full textThis paper gives insights into the opportunities offered by the Bluetooth technology. Bluetooth advertising proves to be a cheap and strong tool for enriching and improving the experience offered by a public transport system, by delivering dense and essential information about topics of interest. Alongside the Java platform, new applications can be designed and implemented to make use of the already available Bluetooth technology incorporated in devices in the target public’s custody. The paper sets focus on the segment of ready to be made available content regarding general information about the routes and timetables of the vehicles integrated in a public transport system.Public Transport, Bluetooth, Java, Mobile Device
3D mesh geometry filtering algorithms for progressive transmission schemes
No full textBalan, Radu; Taubin, Gabriel. (1999). 3D mesh geometry filtering algorithms for progressive transmission schemes. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3436
Project and Sports Events Management
No full textThis paper tries to capture the importance it holds the project management in socio-cultural sector which stands out when we refer to the sport. So when we talk about project management in sport, to consider a much larger vision, a new project management perspective, they involve a responsibility for the implementation of an event with global impact on very long term. Sports projects, as history shows us, played a significant role in developing societies. Also, all major sports industry projects had at a somewhat modest cheer, developing exponentially along the history, often in spite of all chances. The scope of the industry is now so large that establishing new market data is a major task.project management, sports event, project, sports, spot, sports industry, sports education, sports management, sports activity management.
Dynamic performance of a speed sensorless induction motor drive with flux weakening operation
No full textThe paper 1 is concerned with the operation in dynamic regime of an induction motor drive operated into deep flux weakening operation. Based on the induction motor's mathematic model, an algorithm for sensorless direct flux vector control (SDFVC) was implemented. The control schematic for SDFVC is described. The stator flux amplitude is controlled by the d s axis voltage component, while the load angle (and thus the torque) is regulated by the q s -axis voltage component. The proposed algorithm is suitable for low cost induction motor drives where accuracy in the speed estimation is not mandatory and is based on a closed-loop stator flux observer. The vector control block is realised with two PI regulators, the output of this regulators being the reference voltages in the stator coordinates oriented along the stator flux. The authors studied the behavior of a drive system in the field weakening zone, in order to get a maximum torque considering the limitations imposed to currents and voltages. The system was also tested in transient regimes of acceleration and deceleration, the stationary regime being studied too. The experimental data gathered during the accomplishing of the drive system tests when the control algorithm was employed are presented and discussed in the end. The tested three phase induction motor has a power of 4 kW
On the optimization of the rotor flux vector control used in induction motors drive systems
No full textThe paper presents an optimization of an indirect vector control strategy for induction motor drives. Based on the mathematic model of the induction motor which considers the iron loss resistance, a control algorithm has been conceived to reduce the difference between the measured and estimated torques. Two cases are presented in the paper. In the first case the iron loss resistance is neglected in the control algorithm, but it is considered in the second case. The indirect vector control algorithm was implemented on a dSPACE DS 1104 platform controlling an inverter fed 2.2 kW induction motor
Indirect vector control of induction motors drive systems considering the iron loss resistance
No full textThe paper deals with a modality to perform indirect vector control while considering the iron loss resistance. The control algorithm was conceived starting from the induction motor's mathematic model. Its implementation improves the drive system efficiency. Two cases are presented. In both of them the iron loss resistance is considered, but the first one considers the same value for the rotor time constant, whilst for the second one the rotor time constant is modified. A comparative analysis is made for the mechanic torque, when the speed is lower than the rated value. Through this control algorithm a reduction of the difference between estimated and measured torques while considering the iron loss resistance and a variation of the rotor time constant were realized. dSPACE DS 1104 was used to perform the experimental tests. In the end, tests were performed considering the variation of the magnetizing inductance in the range of speeds higher than the rated one
An efficient method for flux weakening control of an induction motor drive system
No full textThe paper presents a speed-sensorless induction motor drive system operated into deep flux weakening region. An efficient direct control method based on the stator flux control is detailed. The speed-sensorless proposed algorithm is based on the induction motor's mathematic model and is suitable for low cost industrial applications. Simulations and experimental results based on this algorithm are also presented. The experimental tests were performed based on a dSPACE DS 1103 platform controlling an inverter fed 4 kW induction motor
Analysis and Survey of Multi-Phase Power Electronic Converter topologies for More Electric Aircraft Applications
No full textConsiderations on signals conditioning circuits
No full textThe paper deals with specific matters related to the designing, simulation, realization and testing of conditioning boards used for signals of current used to test the control part of power converters using DSP (Digital Signal Processors) and dSPACE. The electric schema is described along with the algorithms used for the designing of the blocks used during circuits' realization. In the final part one presents the experimental waveforms. A comparison is made with the simulated waveforms obtained with dedicated software packages
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