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De Negueruela C.,GMV Inc | De Negueruela C.,European Space Agency | Broschart M.,Germanischer Lloyd Industrial Services GmbH | Broschart M.,European Space Agency | And 3 more authors.
Personal and Ubiquitous Computing

Recent experiments have shown the possibility to use the brain electrical activity to directly control the movement of robots. Such a kind of brain-computer interface is a natural way to augment human capabilities by providing a new interaction link with the outside world and is particularly relevant as an aid for paralysed humans, although it also opens up new possibilities in human-robot interaction for able-bodied people. One of these new fields of application is the use of brain-computer interfaces in the space environment, where astronauts are subject to extreme conditions and could greatly benefit from direct mental teleoperation of external semi-automatic manipulators-for instance, mental commands could be sent without any output/latency delays, as it is the case for manual control in microgravity conditions. Previous studies show that there is a considerable potential for this technology onboard spacecraft. © 2010 Springer-Verlag London Limited. Source

Woebbeking M.,Germanischer Lloyd Industrial Services GmbH
European Wind Energy Conference and Exhibition 2010, EWEC 2010

Certification of wind farms, turbines or components is state-of-the-art and a must in most places around the world. Furthermore assessment to harmonised regulations is an active support of export and eases market entries. Therefore it is important to know the different certification processes and guidelines as well as the keystones of their development for all parties involved in a project lifecycle. This paper puts focus on the latest guideline developments for GL 2010: Guideline for the Certification of Wind Turbines, Edition 2010 and describes the outcome and latest innovations of Germanischer Lloyd and its technical committee for certification of wind turbines and projects onshore. Based on [12] it informs about some changes in detail. © Germanischer Lloyd Industrial Services GmbH. Source

Berndt H.,Germanischer Lloyd Industrial Services GmbH
European Wind Energy Conference and Exhibition 2010, EWEC 2010

As a result of the progressive wind energy market in Europe and the serial production of wind turbines the subject of CE marking is getting more important for all parties involved in wind power industry. Authorities do not longer tolerate non-compliance of wind turbines with the essential health and safety requirements given in the European directives. This article gives an overview of the CE marking procedure and describes the basic principles of the risk assessment as key element. Source

Hempel A.B.,ETH Zurich | Kominek A.B.,Germanischer Lloyd Industrial Services GmbH | Werner H.,TU Hamburg - Harburg
Proceedings of the IEEE Conference on Decision and Control

The notion of output-feedback controlled-invariant sets is extended from LTI systems to systems with linear parameter-varying state transition matrix. A theorem is presented that can be used to verify whether a given polytope can be made invariant under output-feedback. The theorem also provides the constraints a control input has to fulfill to make the candidate set invariant. Predictive output-feedback controllers based on such a set can satisfy hard constraints on both the plant state and the control inputs in the presence of process disturbances and measurement noise. Simulation results demonstrate the strength of such a controller that can guarantee constraints for a subset of the state space without requiring state information or estimation. © 2011 IEEE. Source

Holierhoek J.G.,Energy Research Center of the Netherlands | Lekou D.J.,Center for Renewable Energy Sources, Greece | Hecquet T.,University of Stuttgart | Soker H.,DEWI GmbH | And 8 more authors.
Wind Energy

PROcedures for TESTing (PROTEST) and measuring wind energy systems) was a pre-normative project that ran from 2008 to 2010 in order to improve the reliability of mechanical components of wind turbines. Initiating the project, it was concluded that the procedures concerning these components should be further improved. Within the PROTEST project, complementary procedures have been developed to improve the specification of the design loads at the interfaces where the mechanical components (pitch and yaw system, as well as the drive train) are attached to the wind turbine. This is required, since in optimizing wind turbine operation and improving reliability, focus should be given to the design, not only to safety related components but also to the rest of the components affecting the overall behaviour of the wind turbine as a system. The project has resulted in a proposal for new design load cases, specifically for the drive train, a description of the loads to be defined at the interfaces of each mechanical system, as well as a method to set up and use the prototype measurements to validate or improve the load calculations concerning the mechanical components. Following this method would improve the reliability of wind turbines, although more experience is needed to efficiently use the method. Examples are given for the analysis of the drive train, pitch system and yaw system. Copyright © 2012 John Wiley & Sons, Ltd. Source

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