Design Research For The Bow Structure Of Bulk Under Slamming

When sailing in waves,a part of ship bow will depart from water surface because of the significant heave and pitch(mostly happened at bow in head seas,and may happened at stern in follow sea). When ship enter into water once again,violent impact with waves will happen,which is called slamming.How to compute the slamming press of ship bow in waves is a complex problem which is not settled completely till now. It involves the dynamic features among air,fluid and structure. The main problem in slamming research is to seek the relations among press,ship type and speed. Since Kamen and Vagena,many researchers have discussed it in theory and experiment method.The main content in this paper is to set forth the slamming press calculations in DNV rules,GL rules and LR rules and the requirements for slamming strengthened bow structure and some comparisons;slamming strengthened bow structure design for a bulk is carried out using DNV rules,and comparisons among several design schemes is carried through when heavy loading draft status replaces light loading draft status in practice. The results from above have been applied in ship production;it is significant for ship structure improvement latter to calculate slamming press with direct calculation method,and then to design bow structure with DNV rules.