Active underwater acoustic cancellation with pressure sensor and piezocomposite transducer

摘要: Active underwater acoustic cancellation is investigated experimentally in a water‐filled pulse tube using pressure sensor and piezo‐composite actuator. The made of thin 1‐3 disk encapsulated transparent rubber put right front the A 20‐dB echo reduction to harmonic incident waves 5–10 kHz achieved by directly phase‐shifting signal amplifying it drive canceling robust analog controller also developed based on identified reflection coefficient transducer with steel backing transfer function from sensor. Issues such as robustness stability are discussed.