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In many wireless sensor network (WSN) applications, the information transmitted by an individual entity or node is of limited use without the knowledge of its location. Research in node localization is mostly geared towards multi-hop range-free localization algorithms to achieve accuracy by minimizing localization errors between the node's actual and estimated position. The existing localization algorithms...
In the past year mini car has been increase in production, this type vehicle need low cost drive train and low maintenance. Motor Switched reluctance has many advantages this motor have lower manufacturing cost with low maintenance. In this paper Switched Reluctance Motor 6/4 is proposed based on sizing-motor procedure. Optimize process using design of experience (DoE) with manual iteration, the final...
This paper introduces a model based on the Petri net method for the performance evaluation of fuel cell systems during operation. The model simulates the operation of the fuel cell stack and its supporting systems by taking into account the causal relationships between the operation of the balance of plant and the fuel cell stack performance. Failures of the supporting system affect the operating...
Array systems, such as those found in phased array radars, present unique challenges to the reliability, maintainability and availability (RM&A) modeler. Due to their large size and gracefully degrading nature, modelers struggle to construct these models using traditional techniques. These techniques often require compromising assumptions in order to simplify the model, while also limiting the...
Analyses of 108 combinations of hard disk drive failure, restoration, latent defect and scrubbing distributions were analyzed. A subset of 8 combinations for 2 different RAID group sizes are presented to illustrate the impact that RAID group size, recovery times, and disk scrubbing of latent defect has on the occurrence of system (RAID group) failures for 10 years. Increasing the group size or extending...
Dispatch reliability (DP) is an index which describes the probability that a flight can take-off on time. This article intends to redefine the dispatch reliability, and thus can reflect a more realistic operational performance, and also have reference value to both aircraft designing and operating management. The new definition will contain relatively overall influencing factors, both mechanical and...
Secure data collection is an important problem in wireless sensor networks. Different approaches have been proposed. One of them is overhearing. We investigate the problem of constructing a shortest path overhearing tree with the maximum lifetime. We propose three approaches. The first one is a polynomial-time heuristic. The second one uses ILP (Integer Linear Programming) to iteratively find a monitoring...
Bayesian networks (BNs) is widely used for system reliability modeling because of its versatility. It is crucial to build BNs from reliability data without experts' intervene. However, the BNs structure learning is still an open problem. Traditional approaches always integrate a structure scoring metric with a particular heuristically searching method. This usually overfits or underfits the data....
In recent days, the quality of power has become more important to the most of the customer load. The unified power quality conditioner (UPQC) is the ultimate solution to provide the quality of power irrespective of the type of power quality problems. The UPQC can improve the quality of power for all end users, but it will not provide the power quality at different demand levels. Another topology Open...
The two-parameter Weibull distribution is the most widely used distribution in reliability engineering. Parameter estimation is a key issue to apply the Weibull to practical engineering. This paper aims to compare the performance of the maximum parameter estimation method (MLE) and the moment parameter method. It firstly investigates some mathematical properties such as solution uniqueness, estimator's...
Simulation and experimental studies of two output series resonant inverter with Asymmetrical Duty Cycle (ADC) control are presented in this work. The prototype has been implemented using 06 MOSFET transistors with 06 antiparallel diodes as switches. The inverter is designed to supply two resonant loads. Simulation and experimental results of the output waveforms of the proposed inverter for RLC load...
Predicting the capacity of wireless mesh networks is difficult, due to the complex interaction of various layers such as the radio environment, media access protocols, network protocols and, traffic load and types. When modelling and simulation takes into account the interaction of all these factors, it can facilitate insights into anticipated network behaviour. These insights can be used to more...
Memory error protection is increasingly important as memory density and capacity continue to scale. This paper presents a memory SEP (Selective Memory Protection) design that enables SEP for commodity memory modules, with no change to the modules or devices. Memory error protection is provided through embedded ECC, a recently proposed, energy-efficient ECC memory organization. The memory SEP design...
Simulation is a main method in research of network reliability. Discrete event model can be used to simulate network information transmission activities and to evaluate the network transmission time reliability. Process Interaction (PI) model, one of main discrete event simulation strategies, can be regarded as a network system with a series of stochastic processes which describe the network activities...
The dual-stator brushless doubly-fed induction generator-based wind energy conversion system (DSBDFIG-WECS) is promising in future wind energy development due to the merits of compact structure, low cost and high reliability. This paper makes the first attempt to compare the performance of vector control (VC) and direct torque control (DTC) based on the DSBDFIG-WECS. The comprehensive comparison results...
We present the design and simulation of a fault detection circuit applied to a Silicon Carbide Mosfet (SiC-Mosfet), fault detection is done by examining the behavior of gate signal. The most important aspects that have been made and are reported specifically: early detection, since the evaluation is done during the transient of turn-on, allowing early detection in the case of short-circuit, failure...
This paper presents our development of an interior permanent magnet synchronous motor (IPMSM) that reduces the amount of rare earth magnets required for its operation by changing the rotor structure. For comparison, as a standard, we employ a conventional IPMSM that uses only rare earth magnets. We introduce 2 types of rotor structures and analyze the average torque and torque ripple using the three-dimensional...
The point of highest mechanical load in an interconnect layer, where crack propagation will start, depends strongly on geometry and material of the attached die as it was already indicated by the CIPS08 lifetime model for insulated models [1]. Therefore, simulations with the following varied geometry parameters were conducted: thickness, area and material of the die as well as thickness of the interconnect...
The constant evolution of electricity grids towards smart grids is changing the paradigm. The intelligent layer which is added over the physical one is bringing a change in the mode in which the electricity is provided. Hence, the electricity providers are shifting their business from product-centered to service-centered ones, change that ensure a better use of their resources and a much wider acceptance...
Fault trees (FT) are widespread models in the field of reliability, but they lack of modelling power. So, in the literature, several extensions have been proposed and introduced specific new modelling primitives. Attack trees (AT) have gained acceptance in the field of security. They follow the same notation of standard FT, but they represent the combinations of actions necessary for the success of...
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