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Phase model based ship line spectrum noise source position identification method

A line spectrum noise and identification method technology, which is applied in the field of ship line spectrum noise source location identification, can solve the problem of low accuracy of ship line spectrum noise source location identification

Active Publication Date: 2013-06-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of the prior art that adopts the ship passing characteristic method to identify the position of the line spectrum noise source of the ship with low accuracy, the present invention utilizes the phase characteristics of the Doppler signal formed by the relative motion of the ship under test and the measuring hydrophone, in the Under the measurement condition of only a single hydrophone, the position of the line spectrum noise source of the ship can be identified

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  • Phase model based ship line spectrum noise source position identification method
  • Phase model based ship line spectrum noise source position identification method
  • Phase model based ship line spectrum noise source position identification method

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[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] When measuring the radiated noise of ships, the measurement sea area can be determined manually. Generally, the sea area with calmer sea surface and deeper water depth is selected. This can reduce the influence of underwater acoustic channels on the measurement. The speed of sound c in water can be measured and is a known quantity.

[0017] The present invention comprises the following steps:

[0018] 1) Any fixed position L on the ship c A known hydroacoustic synchronous locator is deployed as a beacon source. The ship sails at a constant speed in a straight line at a speed ν, approaches the hydrophone from far to near and leaves the hydrophone from near to far, and measures the hydrophone. R 0 , in this process, the acoustic signal received by the hydrophone is measured and converted into a voltage signal s(t), 0<t≤T, which is recorded by the...

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Abstract

The invention provides a phase model based ship line spectrum noise source position identification method. On an existing single-hydrophone ship-radiated noise measuring platform, instantaneous phase and time-varying amplitude of a Doppler signal are obtained by utilizing a higher-order ambiguous function method according to Doppler effect generated by relative movement between a ship and a measuring hydrophone during measurement, then parameters of the Doppler signal are estimated by using a weighted nonlinear least square method, and a reference sound source is combined, so that positioning of a ship low-frequency line spectrum noise source is achieved. The method is simple to implement, and measuring accuracy of the method is higher than that by a characteristic method.

Description

technical field [0001] The invention relates to a method for identifying the position of a line spectrum noise source of a ship, and relates to the fields of signal processing, underwater acoustic measurement and the like. Background technique [0002] The total sound level of ship radiated noise depends on all radiated noise sources, and the main noise sources come from the ship's main engine propulsion system, propeller, auxiliary mechanical system and hydrodynamic effects generated during navigation. Among them, the line spectrum noise caused by the reciprocating motion of the auxiliary machinery has the characteristics of low frequency, strong stability and relatively high power. It carries important characteristic information of the ship and can be detected at a long distance. The key to the boat. Reducing ship noise can not only effectively reduce the noise impact of ship navigation on marine organisms, but also help improve the performance of various underwater acous...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/76
Inventor 杨益新徐灵基
Owner NORTHWESTERN POLYTECHNICAL UNIV
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