This paper summarizes numerical and experimental works carried out to actively control broadband vibrations of a stiffened panel by using a decentralized feedback method. The local control loops are composed of piezo ceramic patches as actuators, accelerometers as sensors and control laws as internal model control feedback. The choice of...
In this paper a new SHM system has been developed at ONERA. This system based on the interaction between an electromagnetic field and a composite structure, allows detecting all types of damages having an influence on the electrical characteristics of the structure such as carbon fiber breaking, organic matrix pyrolysis,...
This paper aims at presenting the activity carried out in the framework of the GEOCAST IST project for implementing reliable multicast transport protocols in a geostationary satellite system operating at Ka-band. More precisely, this paper describes the results obtained in GEOCAST to assess the performance of these multicast protocols through...
Prediction of ducted-fan broadband noise has become a challenge for reducing aircraft turbofan noise because it dominates overall sound levels at subsonic rotation tip speeds. This paper discusses the equations established in a previous work for a uniform flow inside the duct, the free medium being at rest (case of...
Fortinet® -- the pioneer and leadingprovider of unified threat management UTM solutions -- today announcedthat Onera, the French national aerospace and defense research & technologyorganization, has selected Fortinet's FortiGateTM-3810A multi-threatsecurity appliance to provide firewall protection to the 10-Gbps networkset up between its headquarters and a new remote research center. Onera's...
DUBLIN, Ireland -- Research and Markets (http://www.researchandmarkets.com/reports/c69125) has announced the addition of Government Policies and Initiatives in Nanotechnology Worldwide 2007 to their offering. Governments worldwide are now strongly supporting R&D in nanotechnology, with over 30 countries implementing concerted national initiatives and programs. Government spending on...
Articles 2007-09-21
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