Outfield acoustically-driven ship vibration noise transmission path analysis method

Abstract

The invention relates to a detection method in the ship test technology field and particularly relates to an outfield acoustically-driven ship vibration and noise transmission path analysis method. The method comprises steps that, information of inner and outer acceleration sensors of a ship and an outer hydrophone measurement channel of the ship are set; according practical measurement positions of various vibration sensors, grading classification of vibration measuring points is carried out according to an equipment machine foot, a vibration isolation device, a piping system, an inner ship side and an outer ship side; a high power sound source is employed, according to main characteristic frequency spectrums of radiation noise, a sound signal is emitted to excite warship casing key positions, and data acquisition is carried out; transmission path contribution amount analysis is carried out according to calculation results, for the transmission path contribution amount analysis, a response component generated at an assessment point of each path is contrasted with the overall response, and the contribution amount of the response component of each path in the overall response is calculated. Through the method, a problem of excitation difficulty in the ship can be solved, and the method has certain reference values for subsequent ship transmission path analysis.

Description

technical field [0001] The invention relates to a detection method in the technical field of ship testing, in particular to a method for analyzing the transmission path of vibration and noise of a ship excited by external field sound. Background technique [0002] The acoustic stealth performance of a ship is an important index to measure the safety and combat performance of a ship. Maintaining the acoustic stealth of a ship to the maximum is of great significance for improving the ship's survivability, exerting combat effectiveness and maintaining effective strategic deterrence. Radiation noise is the main target information of various passive sonar and acoustic weapons to detect ships, and it is the main factor that destroys its acoustic stealth performance. Therefore, it is of great significance to reduce the underwater radiated noise of ships. The ship itself is a very complex noise source, and the main noise sources can be summarized as: mechanical noise, hydrodynamic ...

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Problems solved by technology

The literature "Analysis and Experimental Verification of Ship Vibration and Noise Source Transfer Path, Vibration and Shock, 2013, 32(22)" aims at the transfer path analysis method for working conditions, although it is attractive in engineering applications, the accuracy is still difficult to meet the actual application of ships Considering multi-source signals as convolution and aliasing, a method of coupling vibration and noise source separation is proposed

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