Abstract
One of the most important aspects of superyacht design is the comfort on-board in terms of vibration and noise
performance. While NVH (Noise Vibration Harshness) analysis has been well established in the automotive industry, it is
a recent concern to the marine industry. Reflected in the new rules and regulations issued by the Classification Societies
for the evaluation of maximum noise and vibration. In order to improve the comfort level onboard their superyachts, an
Italian superyacht shipyard, in cooperation with the European Boat Design Innovation Group (EBDIG) partners, Genoa
University and Coventry University, developed an NVH methodology for superyacht superstructures. This began with a
comprehensive investigation into the dynamic behaviour of superyacht structures and a review of existing comfort rules.
The investigation involved FEA of a 60m superyacht. The results of modal and transient analyses were compared with
experimental data gathered during the vessels construction to validate the FEA model. A reliable predictive analysis is
critical to avoid problems with the completed hull, due to the significant challenges of modifying the dynamic behaviour
of the hull structure after construction. Any action towards vibration and noise reduction generally implies a significant
increase in structure weight, the reduction of which continues to be a key objective of superyacht design. Even when the
general structural vibration issues are solved, some vibration problems can persist at a local level. To address this a post
construction solution was developed, which involved the application of a "Tuned Mass Damper" system. A 60m super
yacht after refitting, exhibited unpleasant vibrations on the highest decks, which could be mitigated by the application of
a TMD device. In this paper the NVH methodology is presented starting from the initial natural frequencies analysis and
ending with the FEA simulation and optimisation of a passive control device, designed to be easily adapted to the deck
geometry
| Original language | English |
|---|---|
| Title of host publication | Unknown Host Publication |
| Publication status | Published - 2015 |
| Event | Design and Construction of Super and Mega Yachts - Genoa, Italy Duration: 13 May 2015 → 14 May 2015 |
Conference
| Conference | Design and Construction of Super and Mega Yachts |
|---|---|
| Country | Italy |
| City | Genoa |
| Period | 13/05/15 → 14/05/15 |