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An efficient and unconventional modelling approach is established for the investigation of power delivery network (PDN) constituted by a multilayer printed circuit board (PCB) structure. The proposed model is applied to the power integrity (PI) analysis through a PDN structure with power/ground planes, vias and decoupling capacitors. The modelling methodology is based on the tensorial analysis of...
An unconventional circuit modelling for 3D multilayer printed circuit board (PCB) is developed. The modelling methodology uses the tensorial analysis of network (TAN) approach. The multilayer PCB TAN model is based on the modified Kron's formalism. This unfamiliar circuit modelling is first time applied to the multilayer PCB interconnect modelling. After the diakoptics analysis of the proof of concept...
To control power flow for multi-terminal high voltage DC (MTDC) grids, the transformations of synchronous reference frames highly relies on the knowledge of the amplitude, phase-angle, and frequency offset of the grid voltage's positive and negative sequence components especially under grid fault conditions. Therefore rapid and accurate detection of the above information are more significant. The...
Magnetic ring structure has attracted quite a lot of research interest within the recent decades, due to their potential applications in magnetic recording technique [1-3]. However, even in the case of elliptic rings, the chirality of magnetization vortex is difficult to be determined. The introduction of some asymmetries into the geometry is helpful to the precise control of the chirality [2,3]....
We introduce a new technique for coordinating teams of unmanned aerial vehicles (UAVs) when deployed to collect live aerial imagery of the scene of a disaster. We define this problem as one of task assignment where the UAVs dynamically coordinate over tasks representing the imagery collection requests. To measure the quality of the assignment of one or more UAVs to a task, we propose a novel utility...
A new HVDC transmission system based on an inductive filtering method is presented in this paper, and then a unified equivalent circuit model and mathematical model are proposed for the calculation on the harmonic transfer characteristic of the new HVDC systems. Firstly, according to the topology of the new HVDC converter station, the equivalent circuit model, which is expressed by the fundamental...
In this study, freshness changes and shelf life prediction of cultured tilapia (Oreochromis niloticus) stored at 0, 5 and 10°C were investigated. Total viable counts (TVC), the count of Pseudomonas spp. and total volatile basic nitrogen(TVB-N) in newly-caught tilapia were determined as 4.79±0.60 log cfu/g, 4.00±0.75 log cfu/g and 8.08±0.46 mg/100 g, respectively. At the end of shelf life, TVC, the...
A bipolar charge transport model has been developed to simulate the dynamics of space charge under dc fields. The modeling shows space charge build-up and decay comparable to experiments. In this paper, this bipolar charge transport model is taken further to simulate the space charge in polyethylene under ac fields. The results show that there is small quantity of phase-dependent bipolar charge accumulation...
An Electro Mechanical Actuator(EMA) is proposed to replace a conventional hydro mechanical actuator in the rudder of a twin engined commercial aircraft. This paper considers the thermal management of the actuator and investigates passive cooling. The cooling of the EMA motor becomes critical during ETOPS operation, when the aircraft is operated on only one engine. This paper provides design guidelines...
Transient space charge within polyethylene has been simulated based on a bipolar charge transport model with a constant mobility. Initial results are in good agreement with those previously reported. To further develop the model, two types of field-dependent carrier mobility: power-law mobility and Poole-Frenkel mobility are considered in the charge transport process. Various space charge profiles...
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