CERTAIN INTENSITY SOUND FIELD AT VARIOUS DISTANCES FROM MAST OF A BOAT
Abstract
An analysis of the literature shows that for many years the domestic and foreign scientists, research institutes, design bureaus have been engaged in the theory of vibration of different designs on the ship, in particular mast vibration. Published fundamental scientific works, designed and conducted vibronoiseprotection design effective organizational measures to combat noise and vibration on ships. However, research works on theoretical studies of functional parameters measured vibration of the mast from one or more independent variables: time, frequency, spatial coordinate in a group of independent measurements of vibration of the mast, especially for masts, made of different materials, there is little, it is not It allows to calculate, for each section, the maximum value of the modulus mast deflection from the equilibrium position, and calculate the intensity of the sound at different distances from the mast. Determination of sound intensity at different distances from the mast contributes to the knowledge of hazardous areas affecting the health of the crew. Thus, human safety at sea has been and remains the most important problem of navigation and, therefore, further study of vibration, noise and reduced acoustic load vessel in the work area on ships is an actual scientific and technical task that causes a scientific basis to expand its use on board ships. The aim of the study is to determine the intensity of the sound, which extends from the vibrating poles of different materials. To achieve this goal it was necessary to solve the following problem – to carry out theoretical research of vibration – forced oscillations masts made of steel, fiberglass, wood and intensity of sound at different frequencies forced vibrations at certain distances from them. The results showed that the value of the intensity of the sound field at all frequencies of forced oscillations decreases with increasing distance from all masts (steel, fiberglass, pine). The amplitudes of the harmonic oscillations at a fixed frequency and time increases with the cross section of the mast. Significantly larger amplitude vibrations has a mast pine – fiberglass – steel and, therefore, the value of the intensity of the mast of steel noticeably smaller than pine, fiberglass.
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