Acoustic durability of rigid vibration damping structures
The article deals with the assessment of acoustic durability of rigid vibration damping structures, which are widely used on ships. This assessment is certainly important in order to predict the decrease in the effectiveness of the anti noise complex over time in normalized premises. The authors carried out measurements of the coefficient of mechanical losses of plate samples, performed with a difference of 5, 7 and 17 years. In the analysis of the measurements, the statistical null hypothesis of the equality of mathematical expectations was tested in order to confirm or deny the statistical coincidence of the values of the mechanical loss coefficients changed at different times. On the example of the developed ship model with the use of the energy statistical method of noise and vibration calculation, estimates of the effect of vibration damping coatings of rigid type on noise in ship premises are obtained.