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Strain gages sensors for high stability piezo actuators
19 June 2023
Space, military, and industrial applications require precision position sensors in order to perform closed-loop control or to monitor the state of a system. Those applications usually come with constraints such as wide thermal range, long lifetime, high stability, and compactness.
Structural damage identification
19 June 2023
This paper presents two approaches for structural damage identification, each based on a different philosophy. The Virtual Distortion Method is a model-updating method of damage assessment, utilizing gradient-based optimization techniques to solve the resulting inverse dynamic problem in the time domain. Case-Based Reasoning is a soft-computing method utilizing wavelet transformation for signal processing and neural networks for training a base of damage cases to use for retrieving a similar relevant case.
Super amplified piezo actuator
19 June 2023
MICROMEGA DYNAMICS is a spin-off company of the “Université Libre de Bruxelles” (ULB), Department of Mechanical Engineering and robotics of Pr PREUMONT. This department created in 1989, is specialized in the modeling and control of mechatronic systems and in the active control of vibrations.
Rotating piezoelectric motors for high precision positioning & space applications
19 June 2023
Piezo-electric motors have been successfully developed for various applications like autofocus drives in camera lenses and handling equipment for semiconductor production. Their high speed and accurate positioning capability, combined with a favourable holding torque in unpowered condition, make piezomotors also very attractive for actuation purposes in spacecraft mechanisms. The paper introduces a new concept of a versatile ultrasonic piezomotor. The testing campaign carried out on the designed rotating piezomotor has validated the vacuum compatibility and the lifetime of the motor in air.
Rotating step by step piezomotor for nanopositioning and space applications
19 June 2023
Piezomotors are well known in various applications where high precision actuation is required like AFM or handling equipment for semiconductor production. Their specific low speed in direct drive and high torque characteristics combined with high holding torque in off power conditions make them very attractive for any positioning application and especially space mechanisms where low electrical consumption is always sought. A new concept of rotating stepping piezomotor has been developed in the frame of the LISA space project where the mechanism of the telescope orientation was addressed.
Rotation free linear actuator
19 June 2023
This paper presents the development of a rotation free linear actuator: The use of highly dynamic actuator in the rotating frame, such as piezo actuator, required dedicated devices to transmit the electrical power from the static frame to the rotating one. Slip rings and rotating transformers are able to provide this function. However the integration of such components required invasive operations
