Underwater Diagnostic Method of Propulsive Machinery
The paper presents results of investigations relating to changes in the underwater noise radiated by surface ships. The results allow to estimate the changes in technical condition of ship's mechanical devices and especially the propulsion system. The main goal is the examination of the transmission of acoustic energy from moving object into the water environment. The methodology of evaluation of the transmission of vibration energy from the mechanisms in a ship engine room into the sea environment is presented. The examination of vibrations generated into the ship's hull was conducted along the hydroacoustic field. The underwater noise measurements were made for sailing conditions as well as during anchorage. The measurement results were used as the basis to determine the maximum values of sound pressure levels (SPL) and noise spectra. That research allowed to determine the transmission coefficient for the mechanical vibration energy passing through the ship's hull and to evaluate its influence on the hydroacoustic field of a ship. It has been noticed that the features of underwater signals are closely connected to the technical condition of machinery and propulsion system.
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Document Type: Short Communication
Publication date: January 1, 2006
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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