Effect of water-lubricated bearing assembly clearance on shaft system vibration
The water-lubricated stem bearing is usually installed in the beauty rack and the stern shaft tube.The install-ation gap between bearing bushing and stem shaft tube directly affects the bearing stiffness,thus affecting the shafting vibra-tion and greatly affecting the stealth performance of the ship.The friction characteristics and vibration characteristics of the bearings with interference fit and clearance fit under static load conditions are verified by experiments.The results show that the friction torque of the bearings with two installation clearances increases with the increase of the load,decreases with the increase of the rotational speed.Under the same conditions,the friction torque of the bearing with clearance fit is greater than that of the bearing with interference fit.In terms of vibration characteristics,the vibration amplitude of the bearing with clearance fit is greater than that of the bearing with interference fit,and the probability of characteristic frequency at high fre-quency is greater.Under the condition of constant load,the friction characteristics and vibration characteristics of the bear-ing with interference fit are better than those of the bearing with clearance fit.
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