Research Article
Structural Design and Test of a Piezoelectric Flextensional Transducer for Passive Detection of Frogmen
Table 2
Electromechanical parameters before and after deformation.
| | Item | Symbol | Before deformation | After deformation | Differential modulus | Rate of variance |
| | Resonance frequency (Hz) | fr | 3350 | 3290 | 60 | 1.8% | | Antiresonance frequency (Hz) | fa | 3396 | 3330 | 66 | 1.9% | | Mechanical quality factor | Qm | 11.6 | 12.8 | 1.2 | 10.3% | | −3 dB bandwidth (Hz) | Δf | 414 | 402 | 12 | 2.9% | | Mechanical quality factor at −3 dB band pass | Qmd | 8.1 | 8.2 | 0.1 | 1.2% | | Electrical quality factor | Qe | 3.1 | 3.2 | 0.1 | 3.2% | | Dynamic branch equivalent resistance (Ω) | Req | 12690.4 | 13550.1 | 859.7 | 6.8% | | Dynamic branch equivalent capacitance (F) | Ceq | 4.6e−10 | 4.4e−10 | 0.2e−10 | 4.3% | | Dynamic branch equivalent inductance (H) | Leq | 4.9 | 5.4 | 0.5 | 10.2% | | Effective electromechanical coupling coefficient | Keff | 0.16 | 0.15 | 0.01 | 6.3% |
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