**Table 1.**

*Vehicle data.*


#### **Table 2.**

*Properties of piezoelectric material.*

**Figure 4.** *Electric energy density response for PZT-5H.*

**Figure 5.** *Electric power density response for PZT-5H.*

The road excitation is as depicted in [6]. The excitation is the bounce input mode vertical position of the road *wr*ð Þ*t* with class D road (poor) and a driving speed for a vehicle of 20 m/s.

In **Figure 4**, the instantaneous electric energy density for piezoelectric material PZT-5H calculated by Eq. (13), with a simulation time of 30 s and a fixed step time of 0.00001 s.

**Figure 5** exhibits the overall instantaneous electric power density response for piezoelectric material PZT-5H calculated by Eq. (15).
