Abstract
This publication presents new research techniques for noise abatement on ships obtaining vibroacoustic parameters of passenger and crew accommodations for newly designed ships. The construction of low-noise ships is a new technical challenge for naval architects, shipbuilders and shipowners. It also requires a new way of looking at these problems. The suggested new research methods based on <i>sound intensity</i> (SI) and <i>laser anemometry techniques</i> (PIV, LDA) in combination with graphical presentation as <i>acoustical imaging</i> (AI) of the field distribution of acoustic wave flows, gives a full range of interpretation possibilities of energy effects and the precautions taken. This will ensure vibro-acoustic optimisation of the product and meet design and standardisation objectives for noise and vibration levels on board. SI analyses are supported by <i>acoustic orthogonal decomposition</i> (AOD) of disturbed acoustic vector fields with a turbulent structure. The innovative SI-AOD method, combined with acoustical imaging (AI) of the results, allows a comprehensive interpretation of noise causes and becomes an highly effective tool for noise abatement on board ships. With a new, holistic approach to explain the mechanism of penetration of structure-borne and airborne sounds into ship interiors, it creates a balance of acoustic power of local sources of noise, which is the basis for the choice of methods for noise reduction. The author describes the mechanism of noise generation inside shipboard accommodations and in shipboard HVAC systems.
Highlights
There are certain acoustic phenomena that significantly affect our quality of life
The innovation of the research proposed in the paper remains in two general areas: 1) Scientific development - theoretical work carried out within the framework of the new sound theory (VST), which is currently being developed, and the application of this theory in the research on vector sound field distributions using the sound intensity technique (SIAOD) and laser image anemometry (A-Particle Image Velocimetry (PIV), A-Laser Doppler Anemometry (LDA)), 2) Industrial applications - vibration-acoustic optimisation of new products that generate excessive noise in the environment at levels exceeding standard limits
The visualization of the structural distribution of acoustic fields, shown in a vector form on in plane or spatial images (2D, 3D), is an innovative technique that permits us to explain the mechanism of sound generation in disturbed flows and reveals the structural nature of acoustic flow
Summary
There are certain acoustic phenomena that significantly affect our quality of life. Much of the experimental researches are focused on finding better ways to identify noise sources and noise transport paths. Investigators continue to work on improvement processing techniques that can be used to visualize noise sources to better understand complicated machinery and other noise generators. Models are built to observe the dynamics of the spread of noise-generating acoustic phenomena. Other experimental research is focused on developing methods, using sound and vibration signatures, for diagnosing and predicting potential problems. These methods utilize advanced signal processing and data reduction techniques to identify fault-sensitive parameters
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