Recently, the regulation related to noise and vibration in general life shows a tendency of becoming strict, and it is not an exception about vessels as well.
It is an important problem to make noise and vibration reduce in the case of vessels. Because vessels have crew's workplace and living accommodation in the same hull, it has the possibility that noise and vibration have a bad influce to precise machines and crew's residence environment.
When the training vessel GINGA MARU was constructed in 1973, main diesel generators in her did not have soundproof and anti-vibration measures. So crew have been badly affected by noise and vibration.
We considered an anti-vibration measure to main diesel genrators, and constructed the consideration on March in 1998
We analyzed the change concerning noise and vibration befor and after this construction, and could verify the effct of this construction. As a result, it could reduce noise and vibration under 1000Hz in the vessel's living accommodation. And noise in the vessel had a cuse in not only noise which was caused by main diesel generators but also their vibration, moreover it could show a correlation in both frequency.
View full abstract