To analyze the piezoelectric bending accelerometer using the equivalen
t circuit, a modified method must be used, because the differential eq
uation of motion for the accelerometer includes a term for volume forc
e due to acceleration. In this work, the piezoelectric bending acceler
ometer is divided into many short sections, and the volume force in ea
ch section is assumed to be the total force acting at the centroid of
the section. Then, each short section can be represented by the equiva
lent circuit, and the total force acts as a constant voltage source at
a terminal at the center of the section. A piezoelectric bending acce
lerometer has been analyzed using the modified equivalent circuit. The
calculated voltage sensitivity of the accelerometer is in good agreem
ent with the experimental value.