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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 aims to present a methodology that helps improving systems modelling by using Process Integration and Design Optimization technologies. Then, the methodology has been applied on an automotive case study: the improvement of the hybrid vehicle TOYOTA PRIUS III modelling. This work has been carried out in the context of the international research program PLACIS (PLAteforme Collaborative d'Ingénierie...
In order to increase the indoor positioning accuracy and reduce the positioning error in wireless sensor network, the Bacterial Foraging Optimization algorithm is introduced to improve the DV-HOP algorithm. The conventional DV-HOP algorithm is not very accurate in calculating the average distance per-hop, and it greatly affects the positioning accuracy. Hence, a new BFO-DV-HOP (Bacterial Foraging...
The electromechanical conversion is a very important aspect in the conversion process of the energy; it is carried out by means of the electrical machines used in all areas of the human activity. By using the electronic computer in the electrical machines design, there can be obtained some better operation characteristics, there can be decreased the losses of electrical energy and increased the power...
The term "SQL-on-Hadoop" has recently gained significant traction [19]. Impala represents a new emerging class of SQL-on-Hadoop systems that exploit a shared-nothing parallel database architecture over Hadoop. Impala was designed to close the gap of near real time data analytics on Hadoop stack and it has shown itself to be significantly more efficient than other SQL-on-Hadoop solutions...
Aiming at the problem of heterogeneous multi-UAVs' cooperative task assignment when accomplishing attack and damage evaluation tasks. We put forward a hybrid algorithm GSA-GA (Gravitation Search Algorithm — Genetic Algorithm), which is a combination of the gravitation search algorithm and genetic algorithm. In this hybrid algorithm, a new code and decode scheme for the GSA particles are given. We...
Due to the investment of new energy such as wind power, the units' regulation system control ability face severe test. In some special load range, the load will be instable, which even results load oscillation fault phenomenon under sequential valve mode. The current studies usually consider that unreasonable overlap settings cause the load oscillation fault. However, the research of the practical...
The grounding performance of EMU (Electric Multiple Unit) is related to the safe operation of high-speed train, and unreasonable protective grounding scheme can bring problems such as abnormal wear of grounding brush, high electrical potential of train body, etc. At present, grounding brushes of CRH380B wear seriously and often need to be replaced. Therefore, it is necessary to optimize the grounding...
Solar and wind power have intermittent nature. In order to guarantee continuous power supply, they need to be accompanied with energy storage systems or bridges between different energy sectors. Hydrogen is a potential candidate for both applications (an energy storage system and bridging technology). Hence, it is interesting to study the practical dynamic properties and limitations of electrolysers...
Overmodulation area of five-phase converters is covered by space vector PWM methods above all. The paper proposes a carrier-based PWM modulator employing the minimum infinity-norm method which is able to synthesize an arbitrary voltage vector in both, αβ and xy planes, respectively, which is advantageous besides the linear modulation area in the overmodulation zone as well. Thanks to the proposed...
In many practical industrial and military applications, systems are always requested to execute a sequence of missions. Some maintenance activities will be conducted during the mission break between two sequential missions. However, a general case is that only part of maintenance activities can be performed because of the limited resources. In this paper, a simulation approach based on Monte Carlo...
Fingerprint positioning is considered to be one of the most promising indoor positioning technique. The most significant technological bottleneck of fingerprint positioning technology is the high labor cost of the radio map establishing process. Many radio map fast establishing algorithms were proposed to solve this problem. There is no evaluation norm for these algorithms but positioning accuracy,...
The explosion of Internet traffic mainly due to multimedia services is bringing real challenges to Internet Service Providers (ISPs). Content Delivery Networks (CDN) aim to face this traffic growth by replicating content as close as possible to end-users. Nevertheless, several issues related to the localization of CDN nodes are involved in the CDN design. The goal of the CDN optimization is to increase...
PMSM machines with concentrated windings have become more and more popular over the last years. The biggest drawbacks of these machines are high cogging torque and the form of the back EMF. Standard approaches try to shape the back EMF sinusoidal to use standard field orientated control. In the following paper an approach is shown to shape the EMF by using derivative free minimization. Using this...
Nature -- inspired metaheuristics have been applied in many different areas and have shown good results in comparisonwith traditional domain -- specific optimization methods. In thiswork, we investigate the ability of a simple variant of differentialevolution to solve 2D scan matching problem. It consists in findingan optimum affine transformation (rotation and translation) between two laser scans...
This paper deals with energy and economic analysis of grid-connected photovoltaic (PV) systems with storage. According to the current Italian market rules, the first goal is to calculate the capacities of PV systems and batteries corresponding to the cost-optimal solution. Then, cost-effective solutions are investigated to maximize self-consumption, minimizing grid injections. Simulations are performed...
A new method for distributed generation (DG) placement based on biogeography-based optimization (BBO) is investigated in this paper. A significant novelty of this study lies in considering fuzzy load uncertainty. For this purpose a fuzzy backward-forward sweep load flow is proposed. The main objectives of this study is minimizing power losses and improving voltage profile. A comparative study between...
This paper investigates the problem of power allocation, in the presence of a malicious adversary. For this scenario, we consider a source, a destination and full-duplex (FD) relay, that receives private messages and transmits jamming signals on the same time and frequency band. In this system model, we assume the adversary can jam legitimate link or eavesdrop the private message, and benefit from...
In this paper, we apply access class barring (ACB) scheme and sparse code multiple access (SCMA) technique to massive machine type communication devices (MTCDs) communications, and propose a resource allocation scheme to increase the number of successful accesses. The proposed scheme employs ACB to control the number of massive random access (RA) attempts during preamble transmission in physical random...
One of the fundamental problems in wireless sensor networks is providing area coverage to fulfill a certain task. This problem in directional sensor networks is more challenging because of limited sensing angle of directional sensors. This paper addresses the problem of deployment and orientation of a specific number of directional sensor nodes in order to maximize the area coverage. First, we present...
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