Real-time evaluation method for small number of measuring points of underwater radiation noise of ship

Abstract

The invention discloses a real-time evaluation method for a small number of measuring points of underwater radiation noise of a ship, which belongs to the field of real-time evaluation of radiation noise and comprises the following steps of: arranging a self-noise sensor and a vibration sensor for the ship to be evaluated, and arranging a radiation noise hydrophone outside the ship; operating common working conditions such as a highest speed, a lowest speed, starting all common equipment, starting as few equipment as possible and the like, and recording sound pressure measurement values and vibration responses obtained by the self-noise sensor, the vibration sensor and a radiation noise sensor of the ship under various working conditions; selecting a plurality of combination working conditions, calculating and storing transfer matrixes under different combinations; and measuring self-noise and vibration signals in an actual navigation process of the ship, selecting a corresponding transmission matrix according to a navigation working condition, and evaluating far-field radiation noise of the ship in a current navigation state according to the transmission matrix. The real-time evaluation method for the small number of the measuring points of the underwater radiation noise of the ship can more accurately evaluate the far-field radiation noise, and has the advantages of convenient operation and control, small numerical calculation amount and few measuring points.

Description

technical field [0001] The invention belongs to the technical field of real-time evaluation of radiation noise, and more specifically relates to a method for real-time evaluation of a small number of measurement points of ship underwater radiation noise. Background technique [0002] Acoustic stealth performance is a key technical index to evaluate the overall performance of a ship. Since sound waves are the most effective carrier for long-distance transmission of information in water, the acoustic signature of enemy sonar detection is the most important characteristic signal that exposes the ship's navigation. It is of great significance to improve the concealment of ships and the safety of operations. [0003] The evaluation methods of traditional ship underwater radiated noise can be divided into three categories: theoretical analysis, numerical simulation and experimental measurement. The only test measurement method that can meet the requirements of engineering applic...

AI Technical Summary

Problems solved by technology

However, due to the thousands of ship machinery and equipment, the sensor measurement points are often smaller than the number of equipment, which leads to the fact that the ship's self-noise and vibration sensors often cannot reflect all the noise information, and do not distinguish between working conditions, and only use the obtained transfer matrix to evaluate the far field of the ship The radiation noise is quite different from the actual

Therefore, the existing technology is subject to the constraints of the measurement conditions, and it is often difficult to accurately reflect the underwater radiation noise of the ship in the actual combat environment

[0004] Aiming at this technical problem, many scholars at home and abroad have conducted a lot of research, and proposed several transfer matrix measurement methods for a small number of measurement points, such as truncated singular value method, regularization method, etc., to reduce the loss caused by a small number of measurement points. The influence of the ill-conditioned matrix on the transfer matrix, however, the above method ignores the influence of the working sample on the transfer matrix

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