Waveform Reconstruction of Ship Radiated Noise

To realize physical simulation of ship radiated noise for physically detecting and assessing weapon and sonar prototype, an algorithm of generating a random time sequence with both specified amplitude probability distribution and desired spectral feature is obtained based on the linear system theory. By means of this algorithm, successive output of simulating ship radiated noise is achieved, and the noise spectral distortion caused by transducer system response can be corrected easily. The equivalent electrical performances of receiving transducer are discussed to construct an acoustic-electrical simulation system over a wideband range (3 Hz～20 kHz). Making use of acoustic coupling cavity，coupled vibration liquid and anechoic tank, physical simulation experiment for target detection system (TDS) can be conducted expediently. The reconstructed ship radiated noise includes continuous power spectrum density (PSD), the lines of the PSD, the envelope spectrum, the total radiated acoustic power and the time signature of noise.