Dynamic Performance
Dynamic Performance
Dynamic Performance
Dynamic performance relates to the behaviour of a material when subjected to alternating fields or stresses at frequencies close to the mechanical resonance of a component. Piezoelectric transducers may be approximately represented by the equivalent circuit shown in Figure 7. The mechanical resonance of the device is represented by L1, C1, and R1 . Since it is a dielectric with electrodes it also has an electrical capacitance C2.
It is this parallel combination of C2 with L1, C1, and R1 that dictates the reactance of the transducer, which varies with frequency as shown in Figure 8.
The graph shows the curve decreasing to a minimum impedance, at a frequency fm followed by a sharp increase to a maximum at fn These two frequencies are the resonance and anti-resonance respectively. The performance of a transducer will have a maximum response at a point which lies between these points.
