Vibration Reduction Performance of Damping-Enhanced Water-Lubricated Bearing Using Fluid-Saturated Perforated Slabs

Yong Jin,Wu Ouyang,Zhenglin Liu,Jianjun Lu,Kunsheng Lao

doi:10.1186/s10033-020-00516-5

Yong Jin, Wu Ouyang + Show 3 more

Open Access

https://doi.org/10.1186/s10033-020-00516-5

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Abstract

As the first link element for the transmission of shaft vibration to the pedestal and even to the hull, water-lubricated bearing plays a key role in suppressing vibration. Although the porous structure is considered as one of the main methods for improving the wideband vibration and noise reduction performance of materials in many industrial fields, the studies in the field of water-lubricated bearing remain insufficient. To enhance vibration reduction performance, a fluid-saturated perforated slab is designed in this study, and via the establishment of a fluid-solid coupled vibration model, the influence law and impact levels were analyzed and verified by simulation and experiments. The results obtained verified that the total vibration amplitude of damping-enhanced stern bearing in the vertical direction was smaller than that of the normal stern bearing, and the reduction amplitude of the characteristic frequency agreed with the optimal value at approximately 0.1 of the volume fraction of the liquid phase when the solid-fluid phase was rubber–water. Additionally, the increase in fluid fraction did not enhance the damping effect, instead, it unexpectedly reduced the natural frequency of the raw material significantly. This research indicates that the design of the fluid-saturated perforated slab is effective in reducing the transmission of the vibration amplitude from the shaft, and presents the best volume fraction of the liquid phase.

Highlights

Underwater vehicles are commonly subjected to several kinds of vibrations and noise during navigation owing to the installation of propulsion shafting and the friction between parts in contact
On the frequency domain graph, it is evident that the amplitude at the natural frequency varies with the volume fraction of the liquid phase and has the best damping effect, which is decreased by 30% at approximately 0.1
By comparing and analyzing the horizontal vibration acceleration of normal stern bearing (Figure 10(a)) and that of the damping- enhanced stern bearing (Figure 11(a)), it can be determined that the amplitude of vibration acceleration of two kinds of stern bearing mainly occurred in a frequency range of 100‒400 Hz, and these amplitudes both increased and the range was widened with the increase in the test shaft speed

Summary

Introduction

Underwater vehicles are commonly subjected to several kinds of vibrations and noise during navigation owing to the installation of propulsion shafting and the friction between parts in contact. The type of stern bearing applied to vibration and noise reduction by most researches is the conventional bearing structure, as illustrated in Figure 1; and an important way of reducing vibration and noise is by enhancing the damping performance of the bearing, improving Another method for improving the lubrication performance of the bearing is by changing the distribution of the slabs and padding the surface texturing to reduce the friction coefficient and indirectly reduce the vibration generated in the operation shafting process. Bhardwaj et al [11], Dong et al [12], Sudeep [13], Yamada [14], Adamczak et al [15], and Yang et al [16] carried out studies on the effect of texture on the vibration in various bearings, and obtained positive results All these improvements have been applied to engineering practices, to improve the water-lubricated bearing performance of vibration and noise reduction, it is necessary to carry out innovative thinking and explore new technologies and methods. By developing the fluid-solid coupled vibration model, the influence law and impact level of the fluid-saturated perforated structure design on the

Analysis

Results and Discussion

Conclusions