The Friction-Induced Vibration of Water-Lubricated Rubber Bearings during the Shutdown Process

Abstract

The vibration noise generated by water-lubricated rubber bearings (WLRBs) seriously reduces the concealment of a ship’s navigation. The purpose of this study was to obtain the relationships between friction-induced vibration and the friction coefficient, specific pressure, temperature, and stiffness of the bearing support during the shutdown process of WLRBs. Using transient dynamic analysis (Abaqus/Standard), the shutdown process of the bearing system was simulated by setting a friction coefficient curve, and with the fast Fourier transform (FFT), the data in the time domain were then converted to the frequency domain. In addition, an orthogonal table was applied to select the best level for each factor. The results show that proportionally increasing the friction coefficient and specific pressure caused higher vibrations, and the effect of the specific pressure on vibration is more prominent than that of the friction coefficient. Higher temperatures led to an increase in the peak frequency of noise (squeal) and the virtual value of acceleration. Increasing the stiffness of the bearing support decreased the higher-frequency squeal but dramatically increased the lower-frequency chatter. The results of the study are of guiding significance for the improvement of research methods and the optimization of the materials and structures of WLRBs.

Holding Force and Vertical Vibration of Emergency Gate in the Closing Process: Physical and Numerical Modelling

“…The variation of friction coefficient between the gate and track was weakened in this study, and the friction coefficient was viewed as a constant in the numerical model. In fact, the relationship between the friction coefficient and the relative velocity in the closing process should be taken into account, which involves the study of the friction mechanism [30,31]. Thus, the relationship and distinction of the friction-induced vibration and flow-induced vibration in the closing process need to be given more attention in subsequent research.…”

Experimental Investigation of the Performance of SBR and RSS Materials as a Sliding Bearing Element

“…Zhou et al investigated the relationships between the friction coefficient, specific pressure, temperature, and hardness of vibration noise produced by water-lubricated NBR rubber bearings (WLRB) by using temporal dynamic analysis (Abaqus/Standard). The results showed that proportionally increasing the coefficient of friction and specific pressure caused higher vibrations and the effect of specific pressure on vibration was more pronounced than the coefficient of friction [21]. Zhao and Zhang carried out theoretical analysis and experiments with the finite difference method to determine the hydrodynamic properties of water-lubricated plain bearings in their study and determined that when the speed is increased, the hydrodynamic effect is obvious, and the water film is discontinuous at speeds lower than 1800 rpm [22].…”

Tribological Behavior of Cotton Fabric/Phenolic Resin Laminated Composites Reinforced with Two-Dimensional Materials

“…Oil-lubricated stern bearings have the risk of oil leakage and combustion in the process of use and are prone to wear and damage due to dry friction when the oil is cut off [1]. With growing environmental awareness and stricter pollution standards, people are urged to research and develop new bearing systems that are pollution-free, wear-resistant, efficient, energy-saving, long-lasting, and so on [2][3][4]. Water is the most promising lubricating medium due to its non-pollution, wide source, safety, and incombustibility properties [5,6].…”