SeBoCom Pre-Study - A preliminary study on Secure Border Communications

This document contains the outcome of the SeBoCom pre-study. The main objective of the SeBoCom project was to define the way to proceed to a further and complete study. This task was to be achieved through this pre-study and through a Workshop involving end-users to stimulate the discussion and gain input regarding their needs. This pre-study collects some initial data on the present Communications infrastructures outlining the co-existence of many different systems, some already based on digital technology, others outdated or quite obsolete. One of the key finding of the present study is the need to define joint procedures to manage communications among different bodies belonging to different Member States: the most reliable and secure telecommunication infrastructure will be useless if there is no agreement on the type and structure of communications that are transmitted over the infrastructure. The pre-study initially considers the pivotal role played by communications in Border Protection field operations, analyzing the different operational aspects. It subsequently presents the state if the art of the communication infrastructures of Border Security Forces in Europe as well as the expected future scenarios obtained through questionnaires sent to the contact points in the Member States. An initial broad view of the requirements for Secure Border Communications is outlined; this is followed by an analysis of the lessons learned in previous events; then a survey of the previous/ongoing studies on similar topics is also presented. The last chapters provide a Technology Survey and the conclusions based on the outcome of the pre-study and of the Workshop held in Ispra on May 27th and 28th 2008.JRC.G.6-Sensors, radar technologies and cybersecurit

Endurance study of complex die of spur gears

213 σ.Σκοπός της διπλωματικής εργασίας αυτής ήταν η μελέτη αντοχής σε σύνθετη μήτρα ψυχρής σφυρηλάτησης ακριβείας οδοντωτών τροχών ευθείας οδόντωσης με τη μέθοδο των πεπερασμένων στοιχείων. Επιλέχθηκαν να εξεταστούν τρεις περιπτώσεις κατασκευής οδοντωτών τροχών των οποίων η κατεργασία προσομοιώθηκε με τη βοήθεια του λογισμικού MSC MARC για την εύρεση των φορτίων που ασκούνται στα εξαρτήματα της μήτρας. Κατόπιν, με γνώση της φόρτισης βρέθηκαν οι εμφανιζόμενες τάσεις στη μήτρα με τη βοήθεια του λογισμικού Ansys Workbench. Έπειτα επιλέχθηκαν κατάλληλα υλικά ικανά να αντέξουν στις τάσεις και δόθηκαν οι ελάχιστοι συντελεστές ασφαλείας για κάθε εξάρτημα. Τέλος η μήτρα ελέγχθηκε μέχρι ποιάς τιμής σφικτής συναρμογής μεταξύ εσωτερικής μήτρας και δακτυλίου είναι δυνατόν να εκτελεσθεί ασφαλώς η κατεργασία για τα επιλεγμένα υλικά.The aim of this thesis was to study the endurance of complex cold precision forging die of spur gears with the use of the finite element method. Three cases of manufacturing gears were examined whose processing was simulated using the software MSC MARC for finding the loads on the components of the die. Consequently, knowing the loads, the occurring stresses were found in the die with the help of the software Ansys Workbench. Afterwards, suitable materials capable of withstanding the stresses were selected and the minimum safety factors for each component were given. Finally, the maximum value of shrink fit interference between the die and the ring was found at which point processing can be safely executed using the selected materials.Μάριος Δ. Τζιρίτη