Research Article
Modal Analysis of 27 mm Piezo Electric Plate for Small-Scale Underwater Sonar-Based Navigation
Table 2
Summary of the peak response with and without obstacles in the air and water.
| Material used | Relative amplitude (dB) in air at | Relative amplitude (dB) in water at | Relative absorption at | Relative absorption at | 30 cm | 60 cm | 30 cm | 60 cm | 30 cm | 60 cm |
| No object | −71.29 | −81.47 | −11.13 | −23.56 | −60.16 | −57.91 | Plywood | −88.95 | −90.68 | −34.11 | −32.63 | −54.84 | −58.05 | Asbestos | −83.12 | −88.22 | −27.40 | −30.94 | −55.72 | −57.28 | PVC plastics | −78.95 | −81.36 | −24.76 | −30.21 | −54.19 | −51.15 | Iron sheet | −86.17 | −89.12 | −20.63 | −23.33 | −65.54 | −65.79 |
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