New Criteria for the Detection of Slamming Events and Comparison with Theoretical Models

摘要

The estimation of the probability that a slamming event may occur, allows to forecast the number of cycles to which the ship structure is subjected, and their levels. Several approaches to the problem are feasible: (ⅰ) extensive test campaign, (ⅱ) numerical simulation embedded in a Monte Carlo technique and (ⅲ) statistical models.rnIn general, slamming events may be detected by analyzing the rigid body motion with respect to the sea-surface. However, the identification of the slamming impacts can be obtained also by analyzing the recorded time-history of the load on hull portions with a numerical tool capable to separate different force contributions. On the other hand, when only slamming events responsible of a whipping response need to be identified, the vertical bending moment response can be analyzed.rnIn this paper, each of the criteria listed above is used to count the slamming events starting from experimental data on a segmented elastic model of fast ferry. The experimental curves of the statistical frequency of the slamming impact are then compared with the results of available analytical theories showing the applicability of the procedure proposed in this paper for the detection of the slamming events.