The longitudinal vibration characteristics and parametric analysis of a ship thrust bearing integrated with internal disc springs

Zhiwei Huang,Weicai Peng,Qingsheng Li,Xiang Zhu

doi:10.21595/vp.2021.22332

Abstract

To reduce the transmission of shafting longitudinal vibration in surface ships, a design of thrust bearing integrated with internal disc springs is proposed and the longitudinal vibration characteristics of the shafting are studied. According to the structural characteristics of thrust bearing and the deformation characteristics of disc springs, the specific size and combination forms of disc springs in the thrust bearing are designed, and the effective disc springs schemes are achieved according to the static and dynamic design requirements. With the integration of the disc springs into the thrust bearing, the peak of longitudinal displacement response at the base of thrust bearing can be reduced by 10 dB by two schemes of disc springs. The proposed design can effectively suppress the transmission of shaft longitudinal vibration to the hull, which has engineering significance for the longitudinal vibration control of the shafting of the surface ship.

Highlights

The longitudinal vibration of a shafting is transmitted to the hull through the thrust bearing, which causes the hull’s vibration and induces radiation noise
If vibration control measures are taken at the thrust bearing, better results can be obtained for stern vibration control
It can be seen from the figures that after the disc spring isolation thrust bearing is adopted, the response peaks of each order on the thrust bearing base move to the low frequency region, and the peaks of the response are significantly attenuated, about 10 dB, compared with those without disc springs installed

Summary

Introduction

The longitudinal vibration of a shafting is transmitted to the hull through the thrust bearing, which causes the hull’s vibration and induces radiation noise. If vibration control measures are taken at the thrust bearing, better results can be obtained for stern vibration control To solve this problem, Dylejko et al [1] carried out the vibration isolation analysis and optimization design of resonance changer in shafting shell coupling system on the basis of Goodwin [2]. An isolation element with small stiffness could be connected in series at the thrust bearing to reduce the longitudinal vibration of the shafting. THE LONGITUDINAL VIBRATION CHARACTERISTICS AND PARAMETRIC ANALYSIS OF A SHIP THRUST BEARING INTEGRATED WITH INTERNAL DISC SPRINGS. Different stiffness values can be obtained through different combination forms, which is convenient to meet the design requirements in engineering It is a more suitable isolation element. By the numerical study, the effect of the thrust bearing integrated with internal disc springs are discussed

Longitudinal vibration model of shafting

Design of disc springs’ combination form

Design requirements

Parameter optimization design of disc spring

Scheme comparison

Conclusions