Empirical analysis of piezoelectric stacks composed of plates with different parameters and excited with different frequencies
Description
The idea for the study included measurements of actuation frequency for piezoelectric plates, paired together in small “two stage” stacks with the use of measuring equipment already available in the laboratories of the faculty of Mechanical Engineering. Sample piezoelectric plates for the study, kindly provided by Ferroperm Piezoceramics, included plates of different dimensions, made from material called Pz26: - 18x18x8mm (1 plate) - 30x30x10mm (2 plates) All the information about the properties of piezoelectric material and the actuation response for each of the abovementioned plates were obtained from the Ferroperm Piezoceramics site. This dataset involves measurements of displacement of two sets of plates in the piezo stack, actuated with different (separate) frequencies. The library contains raw data obtained from the oscilloscope and the agregated data from excel.
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Steps to reproduce
A small vice was used to fix the measured piezoelectric stack in place. Places of direct contact between the surfaces of the vice and the piezoelectric stack were lined with two layers of rubber tape to electrically isolate the surfaces and enable more free propagation of vibrations generated by the piezo stack. The stack was composed of two plates separated by several (3-4) sheets of very thin, microscope glass coverslips, glued together with cyanoacrylate adhesive which formed a makeshift composite material with thickness of around 1-2mm. That way, a proper electrical isolation between plates was assured together with making enough space to fit the electrodes inside the coupling. Plates and glass sheets were slightly compressed and held together with clamps, until the adhesive settles and connects all surfaces evenly. For the piezo electrodes, a very thin and small plates of tin were cut out from tin sheet. The plates were soldered to the silver coating on the sides of piezoelectric surfaces. The plates were soldered on the opposite sides of the connected plates to save space and avoid any sparks jumping between the contacts and the other plate in the stack. To be certain that both plates are fully isolated, a small snippet of rubber tape was also fit in the remaining space between the soldered contact and the other plate in the stack. A laser was pointed at one face of the stack as precisely as possible to ensure that the reflected beam was pointing back at the vibrometer receiver. A special reflective strip was glued on the surface of the plate at the place where the laser was pointing to ensure good reflection. Aperture used: Waveform generator : Tabor Electronics WW5064 2x Voltage Amplifier : Smart Material HVA1500/50 Laser Vibrometer : Polytec OFV-574 coupled with OFV-2570 Oscilloscope : Rigol DS1064B