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A bistable piezoelectric harvester for wideband mechanical frequency excitation
19 June 2023
The developments of autonomous systems such as for self health monitoring, embedded systems are increasingly used in industrial applications. The energy supply is a key point for the development of such systems. Solutions based on battery have limited life time and the power supplies through wires aren’t always appropriate and easy to install. Furthermore, the battery recycling is complex and an expensive process. The researches on power supply through harvesting systems are increasing in the same way the autonomous systems.
A new amplified piezoelectric actuator for precise positioning and active damping
19 June 2023
Two typical characteristics of direct piezoelectric actuators are displacements of ten micrometers and high stiffnesses. recently, multilayers actuators have been improved, and they now display strains of approximately 1200ppm at low excitation levels (less than two hundred volts). Thus, they are well suited to perform precise positioning of optical devices. But for industrial needs, this performances is still insufficient for positioning devices with larger displacements (in the range of several hundred micrometers).
A wideband piezo vibration energy harvester
8 September 2022
This paper focuses on the design of the bistable energy harvester based on a patented solution invented by the SYMME / USMB laboratory and using Amplified Piezoelectric Actuator (APA®) technology. A preliminary prototype is developed considering the lifetime and mechanical limitations. Experimental results are also given for swept sine and random vibration.
Cost efficient space micro-switch based on Contactless Eddy Current Sensor
8 September 2022
Micro-switches are frequently used in Space mechanisms to provide telemetry or to provide positive indication of the achievement of a desired position or function such as open, close, ready-to-latch, latched, end of travel, reference position, and for different mechanism applications. Current switches that rely on electro-mechanical technology are not very reliable and are sensitive to mounting orientation, to thermal gradients, and have a limited number of operational cycles, which is a problem for long life application, launch vibrations and shocks loads.
High power density Piezo motors for critical environments
8 September 2022
Piezoelectric motors offer many advantages for applications in numerous industrial sectors. The requirements for which these solutions are developed are focused on their main advantages such as non-magnetic and radiation compatibility, high force/volume ratio, good unpowered stall force and low power consumption. Such applications are typically concerned by exotic working conditions on which the piezoelectric motors still need to improve regarding the technological readiness level.
Mechatronic piezo mechanisms for active vibration control
8 September 2022
The current trend in the market to solve long boring bar related chatter problems are passive dampers integrated in the boring bar, which has derived in patents and commercial products; This solution, however, is not feasible in very slender bars or trepanning operations, due to small space available in the tool. Active damping has been tested and indus-trialised in different applications, including machine tool structures, but never in internal turning tools. The application of active damping on boring bars has been proposed in several researches…
