Abstract
Due to the heave motion of ships, the longitudinal vibration of the lifting system is considered as the critical dynamic response. Neglecting the effect of the flexible hose attached to the buffer, then the lifting system is composed of a fluid-filled riser with concentrated masses, i.e., pumps and buffers. Based on the extended water hammer model, new expressions are proposed for stepped connectors and pumps either under normal operating conditions or shut down, and unblocked or blocked buffer. The numerical results show that the heave frequency for the peak von Mises stresses is much lower than the fundamental frequency of the lifting system, because of fluid-structural interaction effects. Adopting a stepped riser can significantly reduces the maximum von Mises stress. However, the dynamic amplifications are higher in the stepped lifting system subjected to heave motion with a high frequency, indicating additional measures should be employed to ensure the safety of the stepped lifting system.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
