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Model based systems engineering (MBSE) has gained popularity in disciplines such as computer science and aerospace engineering as a tool to better manage the increasing complexity of human made systems. In contrast to the traditional document-centric paradigm, MBSE applies modelling techniques to support all stages of system development such as design, verification and validation. One of the key advantages...
Uninterruptible Power Supplies (UPS's) are designed to provide emergency power when the main power source fails. To avoid this impact and to protect effectively the loads, one solution is to provide a redundant loading system using a dual power energy source other than the UPS to achieve an automatic static transfer when necessary. In this work, an additional module has been designed and connected...
It is well known that the ionosphere affects radio waves propagation on Earth-space paths. One of the ionosphere characteristics influencing such propagation is the total electron content (TEC) that the wave encounters in his course. The knowledge of TEC behaviour under different time, geographical and solar activity conditions and its variability is important for satellite communication system planning...
This paper summarizes the main results of a study aimed at problem of the operation of the overhead line with inserted underground cable. Firstly the analysis of the risk of the cable insulation fault is presented and the study of protection applications follows. This study considers the situation of two cable sections inserted in an overhead line that is protected by surge arresters at both ends...
The use of EHF and SHF systems operating above 20 GHz is becoming increasingly popular for high-capacity communication systems. This popularity is driven by a number of factors, the most common being the congestion at lower-frequency bands and the potentially high capacities available. One of the main disadvantages of using these higher frequencies is that the attenuation caused by meteorological...
To fully characterise the behaviour of complex antenna arrays it is necessary to take into account the whole array environment. This includes all of the surrounding elements along with any radome or other structure nearby. Historically such simulations have proven too complex for 3D field solvers to handle. However new developments in field solver technology, coupled with improvements in computing...
The use of EHF and SHF systems operating above 20 GHz is becoming increasingly popular for high-capacity communication systems. This popularity is driven by a number of factors, the most common being the congestion at lower-frequency bands and the potentially high capacities available. One of the main disadvantages of using these higher frequencies is that the attenuation caused by atmospheric effects...
A new analytical method is proposed which finds reliability, average failure rate and the operation and maintenance cost of wind turbine generator (WTG) using site wind data considering the WTG as a non-repairable system. The failure rate function is developed using WTG failure frequency published by renewable energy information system on internet (REISI), Germany. The presented method works computationally...
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