![]() When used strictly as a sensor, the electrical component may be overlooked. Self-sensing piezoelectric actuators (SSPA) are an interesting avenue for structural active control by creating a virtual impedance for the supporting structure, since they are both dual and truly co-localised.Īs can be seen from the equations of a piezoelectric material, 1 the electric displacement, generated by a piezoelectric, depends both on the strain (mechanical component) and the electrical field (electrical component) applied to it. Numerical simulations show good agreement with experimental data. Strain-induced current has been successfully extracted from SSPA signal with this A shunt resistor is used to measure the current simultaneously with The numerical method of current separation has been programmed and validated with MATLAB/SimulinkR® and implemented on Speedgoat hardware. Plate is extracted without complicated electronics. Hence, information related to the global, vibrational flexural modes of the A similar processing can also be used to subtract from the sensor information, near-field vibrations Sufficient accuracy, adequate numerical processing can subtract the capacitive current from the total measuredĬurrent. Provided the measured current is digitized with The latter isĪn order of magnitude smaller than the total current measured. When a SSPA is submitted to a voltage, the measured current is the sum of the electric current due to theĬapacitive effect of the transducer plus the mechanical current induced by the strain of the structure. Piezoelectric device is used to simultaneously measure and actuate, it is called a self-sensing piezoelectric actuator Interesting avenue since they can lead to the implementation of distributed virtual impedances. Co-located piezoelectric sensors and actuators, spatially distributed on the structure, are an This requires to accurately measure the vibrations of the aircraft panels while injectingĪnti-vibrations. The advantages of the units are small size and high efficiency for high voltage power generation in the range of Watts.Significant reduction of airplane interior noise may be obtained by active structural acoustic control (ASAC) These units demonstrate both piezo effects, the direct and Mechanical power to electrical power and the voltage taken form the electrode structure with much larger spacing the exciter electrode. The second functional section transforms the The energy isĬonverted twice: The electrical input power is converted in the first piezo section to mechanical power and excites resonance of the whole piezo body. The unit is operated in mechanical resonance at quite high frequency to increase power density. The electrode spacing ofīoth electrode structures is different and defines the transformation ratio. The first section is for the voltage input whereas the second provide the output. A piezoeletric transformer is aĬeramics block with two functional sections. Piezoelectric stack transformers are very useful for the generation of high voltages. Use concurrently a piezo element as actuator and sensor. Last notice it couples electrical and mechanical energy with high efficiency. Highest position resolution of all and it can generated phantastic acceleration. but not least, it is the actuation principle which has ![]() Linear and matrix architectures are feasible. smaller than 1 mm, as well as huge actuators with 1 m dimensions were built.Ī multiple of actuators can be combined in a system. Small when the producible high forces are considered. Generally, the actuator has a very simple architecture, is relative Mechanisms, optical technology, material and component testing, speakers, inkjet printers, and finally energy harvesting. Piezo stack actuator technology enables a multitude of different types: linear positioning, linear and rotary motors,ĭrives for pumps, pneumatic and hydraulic valves, injection nozzles, dispensers, vibration sources (shakers) for sound and dynamic power generation, also for noise and vibration damping, diverse ![]()
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