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Changes in the energy harvesting characteristic parameters of PEHs after fatigue measurement.
| Parameter | PEH Type | |
|---|---|---|
| HS-PEH | SS-PEH | |
| ΔPrms (mW) (at initial fr) | −6.9% | −23.6% |
| ΔPmax (mW) (at final fr) | +0.20 | −0.74 |
| Δfr (Hz) | −0.5 | −0.8 |
| NVPD (mW/cm3·Hz·g2) | +7.9% | −27.5% |
| Δdv (mm) (at initial fr) | −0.04 | −1.20 |
| ΔC (nF) (at 100 Hz) | +0.7% | −2.1% |
| PS (μC/cm2) | +4.7% | −3.4% |
| Dielectric loss | −16.2% | +11.2% |
| Hysteresis loss | +4.6% | +20.6% |
| Mechanical loss (damping ratio) | −0.3% | +27.5% |
