A | surface area of ceramic element (m2 ) |
B | bandwidth (frequency) |
d | piezoelectric charge constant (C / N) |
D | diameter of ceramic disc or rod (m) |
0 | permittivity of free space (8.85 x 10-12 farad / m) |
T | permittivity of ceramic material (farad / m) (at constant stress |
F | force |
fm | minimum impedance frequency (resonance frequency) (Hz) |
fn | maximum impedance frequency (anti-resonance frequency) (Hz) |
fp | parallel resonance frequency (Hz) |
fs | series resonance frequency (Hz) |
g | piezoelectric voltage constant (Vm / N) |
h | height (thickness) of ceramic element (m) |
k | electromechanical coupling factor |
keff | effective coupling factor |
KT | relative dielectric constant (at constant stress) |
l | initial length of ceramic element (m) |
N | frequency constant (Hz*m) |
Par1 | value for parameter Par at t1 (days) |
Par2 | value for parameter Par at t2 (days) |
Qm | mechanical quality factor |
| density of ceramic (kg / m3 ) |
s | elastic compliance (m2 / N) |
S | strain |
t1 | time 1 after polarization (days) |
t2 | time 2 after polarization (days) |
tan
| dielectric dissipation factor |
T | stress |
To | temperature |
TC | Curie point (°C) |
| velocity of sound in the ceramic material (m / s) |
w | width of ceramic element (m) |
Y | Young's modulus (N / m2 ) |
Zm | minimum impedance at fm (ohm) |
