Design and dynamic analysis of low-frequency mounting system for marine thrust bearing

Abstract

Longitudinal vibration reduction of marine propulsion shafting has drawn great attention of research. In this paper, a low-frequency mounting system (LFMS) is designed. LFMS consists of three sub-systems: floatable self-alignment thrust bearing, floating raft, and air spring mounting system. Floatable self-alignment thrust bearing is a new type of thrust bearing, which can provide small displacement compensation for shafting. In order to maximize the overall vibration behavior of the control system, thrust bearing and marine propulsion unit are integrated on the floating raft air spring mounting system can adjust the floating raft attitude to meet the shafting alignment requirements. A theoretical model is presented to estimate the isolation effect of LFMS. The first-order longitudinal vibration frequency of shafting is 9.8 Hz. Experiments are carried out to verify the isolation effect of LFMS. Experiments show that LFMS has an obvious vibration isolation effect above 10 Hz.