Research on the bow-flared slamming load identification method of a large container ship

Abstract

The impact between the flared bow and the wave will cause a serious bow-flared slamming load. Many investigations have been carried out to predict the slamming load that the hull suffers under severe sea states. With the wide use of the hull structure response monitoring system, it will be of great significance to investigate the ship slamming problem if the slamming load can be identified by using the hull structure response monitoring data in the actual navigation environment. This paper integrates the seakeeping method, computational fluid dynamics method and finite element method to systematically simulate the bow-flared slamming pressure and the local structural response of a large container ship. Through comparative analysis of the dynamic response and static response of the bow-flared structure under extreme slamming load, it is found that the dynamic effect of the bow-flared structure is not obvious. Three different static load identification methods are used to identify the simple static load acting on the flared structure of the bow. By comparing the results of different identification methods, it is found that the TRM + L_curve method can realize the most accurate identification of the simple load. Further, the dynamic response process of the bow-flared structure is regarded as a quasi-static process, and the slamming pressure histories acting on the flared region can be identified. In general, the identification results of the bow-flared slamming pressures are in good agreement with the original slamming pressures, which preliminarily verifies the availability of the present method in the indirect monitoring of the bow-flared slamming load of the large container ship.