Results 131 to 140 of about 8,321 (168)

Simulation model of ship-radiated broadband noise

2011 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC), 2011
In this thesis, the statistical characteristics of ship-radiated noise are discussed. Then, a mathematical model of the noise reconstruction is established for given sea depth and straight distance. The model includes the main characteristics of ship-radiated broadband noise: the continuous power spectrum, the line spectrum, the envelope spectrum, the ...
Jian Luo, Yi Yang
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Merchant ship-radiated noise source levels.

The Journal of the Acoustical Society of America, 2011
Ship-radiated noise is the principal source of noise in the 20–300 Hz frequency regime. This presentation provides a review of the issues relating to measuring ship-radiated noise source levels and predicting the source levels from ship parameters.
Stephen C. Wales, Richard M. Heitmeyer
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Periodic Signal Detection in Ship Radiated Noise

Advanced Materials Research, 2014
Periodic signal is abundant in ship radiated noise. Its detection is an important step towards active control of ship’s acoustic signature. Based on power spectrum analysis and DEMON analysis, an approach to detect line spectrum and modulation spectrum of ship radiated noise is proposed. Periodogram method is used for power spectrum estimation.
Cheng Jun Hu, Yuan Zheng, Han Bo Zhao
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Characteristics Modeling and Simulation of Ship-Radiated Noise

Advanced Materials Research, 2012
Since the importance of ship-radiated noise simulation in onshore simulation training and digital sonar development, we establish a mathematical model of ship-radiated noise on the basis of analyzing the causes and characteristics for each of its components, and then apply the model on simulating each signal component in turn.
Hui Xu, Hai Qiao Xu, Bi Yin Zhang
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A new detection model of ship-radiated noise signal

Ocean Engineering
Guohui Li
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An ensemble source spectra model for merchant ship-radiated noise

The Journal of the Acoustical Society of America, 2002
This paper presents an evaluation of the classical model for determining an ensemble of the broadband source spectra of the sound generated by individual ships and proposes an alternate model to overcome the deficiencies in the classical model. The classical model, proposed by Ross [Mechanics of Underwater Noise (Pergamon, New York, 1976)] postulates ...
Stephen C, Wales, Richard M, Heitmeyer
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On the active control of spectral lines of ship radiated noise

2014 12th International Conference on Signal Processing (ICSP), 2014
By properly setting up a secondary sound source on ship's shell, it is theoretically feasible to suppress ship radiated noise in a local region. Since low frequency line spectrum of ship radiated noise contains significant signature information, its active control has always been an important research task.
Yuan Zheng, Chengjun Hu, Hanbo Zhao
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Ship-radiated noise-field characterization

The Journal of the Acoustical Society of America, 1997
Sonobuoy measurements of merchant ships were processed for mean levels and fluctuation dynamics of the broadband and line components from a large database of ships. Direct path results are reported. The mean levels are compared with various ship source level models.
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Research on Ship-Radiated Noise Beat Tune Future

2014 Seventh International Symposium on Computational Intelligence and Design, 2014
Starting from human subject feeling, ship-radiated noise beat tune future is researched based on psychoacoustics. The relationships between beat tune and the shaft frequency harmonic structure of DEMON are found. Harmonic structures between targets of different types are different, and beat tunes are also different.
Jiaxing Qiu, Jingcheng Zhang
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Similarity Evaluation of Ship Radiated Noise’s Continuous Spectrum

2018 14th IEEE International Conference on Signal Processing (ICSP), 2018
Similarity evaluation of ship radiated noise’s continuous spectrum is indispensable for applications such as underwater target identification, ship status monitoring, etc. The evaluation mainly consists of two signal processing steps: feature extraction of continuous spectrum, calculation of feature similarity.
Yuan ZHENG, Zhizhong LI, Bin JIANG
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