Publications
Categories
Long stroke/High resolution tip tilt mechanism
19 June 2023
Multi degree of freedom (dof) mechanisms are widely required into micro or macro manipulation fields as well as in optronics functions. Commonly available mechanisms may be divided into two main categories. The first is industrial robots (serial or parallel). These offer large range of motion, in rotation and translation. Their resolution is usually limited in the sub-millimeter range. The second category achieves very high resolution motion (sub-nanometer) but is limited to a few decades of microns. A way to combine both long stroke and resolution is to use piezo motors into multi dof mechanisms. The aim of this paper is to present a combination of both advantages into a low volume tripod actuator. The Tripod Actuator by Cedrat Technologies (TrAC) is a 3 dof mechanism offering +/-35° rotation around X and Y axis and a 10mm Z translation stroke into a low volume of Ø50x50mm.
High power force oscillator and drive electronics
19 June 2023
This paper presents the development of one amount the largest piezo actuator ever designed based on low voltage PZT. This actuator is able to provide more than 20kN of force in dynamic operation (60kN in static operation). The purpose of low frequency vibration generation is to improve the quality of parts production in the field of manufacturing and machining process.
High power synthetic jet actuator
19 June 2023
High Power Synthetic Jet Actuator (SJA) based on compact piezoelectric actuators, have been developed and tested by
CEDRAT TECHNOLOGIES (CTEC) and ONERA, under French National funding RAPID from DGA. This publication
presents the modelling approach with early breadboarding results, the final design chosen for integration onto an aircraft
airfoil mock-up, the performance test results on the SJA device prior integration, and the final aerodynamic performance
test demonstration achieved at ONERA wind tunnel test facility.
Highly dynamic & high precision self balanced optical mechanism
19 June 2023
Ongoing developments of instruments reveal the need for fast and precise mechanisms [1]. These requirements are all the more significant when large payloads of hundreds grams, such as mirrors, optical plates, corner cubes or antennas are involved in the motion. Indeed, highly dynamic kinematics coupled with large inertia lead to parasitic reaction forces that interfere on the accurate measurement.
Hysteresis characterization in piezoceramic stack actuators and its influence on vibration and noise reduction in helicopters using actively controlled flaps
19 June 2023
In this study, a characterization of hysteresis in a piezoceramic stack actuator similar to those employed in an actively controlled flap (ACF) system is performed to assess the effects of hysteresis on system performance. The effect of unmodeled actuation hysteresis may significantly reduce vibration and noise reduction capabilities. A hysteresis model based on the classical Preisach model has been developed from experimental data.
Improvement of Linear and Rotative Stepping Piezo Actuators using design and control
19 June 2023
Stepping Piezo Actuators (SPA) are inertial piezo motors able to reach long stroke with important resolution. Previous work showed that large benefits in terms of speed and input current are taken from use of Amplified Piezo Actuators (APA®). The aim of this paper is to present new rotative configuration, advancements in maximal actuation force into thermal vacuum conditions and improvements using smart control.
