A method for the determination of the dynamic nonlinearity of the power of a piezo ceramics and apparatus for carrying out the method

摘要

The invention relates to a method for the determination of the dynamic nonlinearity of the power of a piezo ceramics with the following steps: provision of a pattern to be tested in the form of a piezoceramic ring, with electrodes arranged thereon; applying a first excitation voltage to the electrodes of the ring, wherein the first excitation voltage has an amplitude a low exciter level of the ring corresponds to, and the first excitation voltage, a frequency f_{r (k)} the first radial resonance of the ring in the case of low exciter level; measuring the vibration velocity v_{r (k)} the outer cylindrical surface of the ring; applying a second excitation voltage to the electrodes of the ring, wherein the second excitation voltage is higher than the first excitation voltage and has an amplitude a high exciter level of the ring corresponds to, and the second excitation voltage, a frequency f_{r (p)} the first radial resonance of the ring in the case of a high exciter level; measuring the vibration velocity v_{r (p)} the outer cylindrical surface of the ring; calculating a first difference between the frequency f_{r (p)} and the frequency f_{r (k)} and a second difference between the vibrational speed v_{r (p)} and the oscillating speed v_{r (k)}; Determination of the non-linearity of the piezoceramic element from the calculation of the ratio of the first difference to the second difference according to (f_{r (p)} – f_{r (k)})/(V_{r (p)} – V_{r (k)}). In addition, the invention relates to a device for carrying out such a process.