ABSTRACT

Dismasting is one of the most serious hazards for sailing boats. This event is mainly due to structural defects, poor maintenance or adverse weather conditions. For what the last aspect is concerned, it may be associated to two types of loads: the direct action of the wind on sails and accelerations caused by ship motions. The aim of this paper is to focus on the accelerations induced on the mast by ship motions using seakeeping analysis validated by real scale measurements carried out on two sailing yachts during their transfer trips from South Africa to Italy. After measurements, the recorded data have been analyzed, reordered and related to the weather conditions encountered during the transfer voyage. Then seakeeping calculations have been carried out in order to compare numerical prediction with experimental values. Finally, acceleration values to be considered for preliminary mast scantling, were derived.

摘要

解桅是帆船最严重的危险之一。这一事件主要是由于结构缺陷、维护不善或恶劣的天气条件造成的。对于最后一个方面，它可能与两种类型的载荷有关：风对帆的直接作用和船舶运动引起的加速度。本文的目的是关注由船舶运动引起的桅杆上的加速度，使用耐波性分析，通过在从南非到意大利的转运过程中在两艘帆船上进行的真实比例测量进行验证。测量后，记录的数据已被分析、重新排序并与转运航程中遇到的天气条件相关。然后进行了耐波计算，以便将数值预测与实验值进行比较。最后，