The 2nd-order derivative of the vibration velocity was obtained
using Eq. (20). The maximum strain of the 1-mm-thick PPS-based
bar in the range of 125–175 mm is 0.037%. Using Eqs. (23) and
(24), we calculated that the reactive energy and dissipated energy
in the range of 125–175 mm are 4.900 106 J and 0.085 106 J,
respectively. Thus, the Q factor of PPS is 362 at a driving frequency
of 28.30 kHz and strain of 0.037%.