| 摘要 |
FIELD: acoustics and applied hydroacoustics. ^ SUBSTANCE: proposed method designed for protecting water intake structures of nuclear power stations against intrusion of wreckers and for use in fish industry to protect water intake structures against biological sea beings includes formation and amplification of high-frequency pumping waves at frequencies omega1 and omega2, pumping signals at frequencies omega3 and omega4, high-frequency waves at frequencyomega5, and their radiation onto metal shielding screen of water intake structure, generation of low-frequency wave of differential frequency Omega = omega1 - omega2, generation of high-frequency waves of combination frequencies omega3 ± Omega' and omega3 ± Omega", omega4 ± Omega' and omega4 ± Omega", separation of low-frequency signals at frequencies Omega' and Omega" by detection method, spectral analysis of high-frequency signals, and their comparison with reference signals, whereupon decision is taken on detection of sea being, classification, and determination of heading, speed, and spatial coordinates of sea being, on continuous attack of metal shielding screen of water intake structure where biological sea beings occur with high-frequency waves at frequency omega1 for hydroacoustic cleaning of water intake structure. ^ EFFECT: facilitated identification of intruder and determination of its coordinates at high sea noise and intensive reverberation. ^ 1 cl, 9 dwg |
