Statistics – Applications
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.524..397b&link_type=abstract
In: Proceedings of the 10th European Space Mechanisms and Tribology Symposium, 24-26 September 2003, San Sebastián, Spain. Compi
Statistics
Applications
Actuators, Deployment Mechanisms
Scientific paper
New piezoelectric mechanisms developments are on-going for space applications requiring optical functions or fine positioning on scientific payloads. The application of one of them will be described in detail in a paper from EADSSODERN dedicated to the PHARAO instrument. Two normally centred multi degrees of freedom piezoelectric mechanisms have been recently designed by CEDRAT TECHNOLOGIES on R&D funding: a XY stage, generating two orthogonal motions, and a Double Tilt Tip device, generating two rotations and one translation. The objective of the design was: a design without any latch mechanism, to reduce the number of parts and ease the assembly and integration process, to increase the ratio between the payload's mass and the mass of the piezoelectric mechanism, The interests of a normally centred design, here used, are: a very good thermo-mechanical behaviour, the non energised centre corresponds to the energised centre, which may be of interest in degraded mode for several applications. Several solutions (damping, use of hard-stops) to reduce the criticality of random vibrations have been investigated. Two position sensors (strain gauges, capacitive sensors) have been implemented and compared. Then, the sequence of tests is described and includes: functional tests in open and closed loop and measured accuracy together with an elegant breadboard of the control electronic, the measurement of the parasitic degrees of freedom, thermal vacuum test combined with lifetime test (10e6 full cycles), sine and random vibrations tests. The paper will conclude with the estimated capabilities of the mechanism payload mass versus the level of random vibrations, a comparison of this piezo design with other technologies (voice coil,...) and the application perspectives.
Barillot F.
Fabbro Herve
Guay Ph.
Le Letty Ronan
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