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Meylan, France

Colin M.,University Grenoble alpes | Mortier Q.,University Grenoble alpes | Basrour S.,French National Center for Scientific Research | Bencheikh N.,Cedrat Technologies SA
Journal of Physics: Conference Series | Year: 2013

This paper introduces an innovative architecture of a piezoelectric harvester, which enables harvesting vibration energy at low frequency using the {33}-transduction mode of a piezoelectric element. Unlike cantilevers integrating ferroelectric material combined with interdigitated electrodes, the concept that we propose is based on the elongation/compression excitation of a piezoelectric bar. © Published under licence by IOP Publishing Ltd. Source

Meftah M.,University of Versailles | Irbah A.,University of Versailles | Le Letty R.,Cedrat Technologies SA | Barre M.,Thales Alenia | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

All space instruments contain mechanisms or moving mechanical assemblies that must move (sliding, rolling, rotating, or spinning) and their successful operation is usually mission-critical. Generally, mechanisms are not redundant and therefore represent potential single point failure modes. Several space missions have suffered anomalies or failures due to problems in applying space mechanisms technology. Mechanisms require a specific qualification through a dedicated test campaign. This paper covers the design, development, testing, production, and in-flight experience of the PICARD/SODISM mechanisms. PICARD is a space mission dedicated to the study of the Sun. The PICARD Satellite was successfully launched, on June 15, 2010 on a DNEPR launcher from Dombarovskiy Cosmodrome, near Yasny (Russia). SODISM (SOlar Diameter Imager and Surface Mapper) is a 11 cm Ritchey-Chretien imaging telescope, taking solar images at five wavelengths. SODISM uses several mechanisms (a system to unlock the door at the entrance of the instrument, a system to open/closed the door using a stepper motor, two filters wheels using a stepper motor, and a mechanical shutter). For the fine pointing, SODISM uses three piezoelectric devices acting on the primary mirror of the telescope. The success of the mission depends on the robustness of the mechanisms used and their life. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE). Source

Dubois F.,INSA Lyon | Dubois F.,Cedrat Technologies SA | Belly C.,Cedrat Technologies SA | Saulot A.,INSA Lyon | Berthier Y.,INSA Lyon
Tribology International | Year: 2016

Tribology is not only science of contacts and friction. Tribologist must also take into account the mechanism dimension of rubbing contacts: vibrations propagations, damping and friction-vibration coupling. This is especially true for piezoelectric Inertia Drive Motors. IDM use the stick-slip phenomenon to make micrometric steps along a centimetric stroke. Actuation frequency - kHz - generates parasitic vibrations coupled with the overall system. This investigation aims to understand how these vibrations are created, propagate and interact. Through three experiments on a real IDM, two ways are studied: vibration damping and actuation signal modification. Better understanding of the mechanism impact leads to an energetic balance increase of 25.5%. © 2016. Source

Zappino E.,Polytechnic University of Turin | Carrera E.,Polytechnic University of Turin | Rowe S.,Cedrat Technologies SA | Mangeot C.,Noliac A S | Marques H.,Plant Integrity Ltd.
Composite Structures | Year: 2016

The present work, performed in the frameworks of the CleanSKY project AeroPZT, is devoted to the numerical analysis of innovative actuators made of piezoelectric materials. An advanced numerical tool, based on the Carrera Unified Formulation, have been used to perform numerical analyses of the device. A refined one-dimensional structural model has been used in the analyses to provide accurate results with a low computational cost. Thermal loads and the effects of the encapsulation, which is used to protect the piezoelectric element from the external environment, have been evaluated. Amplified Piezoelectric Actuators (APAs) and a Multi-Layered Actuators (MLAs) have been analysed. The obtained results have been used to derive guidelines for the development of the final design of the actuator able to satisfy the project requirements. © 2016 Elsevier Ltd. Source

Sosnicki O.,Cedrat Technologies SA | Pages A.,Cedrat Technologies SA | Pacheco C.,Cedrat Technologies SA | Maillard T.,Cedrat Technologies SA
International Journal of Advanced Manufacturing Technology | Year: 2010

Recent requirements for accuracy and resolution demand higher quality in the machining of precision parts in many industries-such as optics, automotive and aerospace-by free form machining. The required operations are possible by using expensive manufacturing equipment in parallel with several processes such as grinding and polishing. By using a new fast tool servo, the so-called servo piezo tool SPT400MML, driven by a piezoelectric actuator for the precision diamond turning of non-symmetrical surfaces, components can be machined with a fast motion control of the tool (diamond or carbide). The SPT400MML embeds a patented amplified piezoelectric actuator APA400MML and a real-time controller based on a FPGA component able to improve the overall accuracy. Models based on mechanical FEM software and control design software are used to optimise the achieved performances. Experiments have been undertaken to show the capability to displace a diamond tool on a 400-μm stroke with a first resonant frequency of above 600 Hz. © Springer-Verlag London Limited 2009. Source

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