Friction at the contact point between marine propellers and accessory components
Marine propellers - Due to the relatively complex working environment of the stern shaft, the bearings and stern shaft may sometimes vibrate and produce loud noise due to poor lubrication effect and unsatisfactory clearance. Marine propellers may also produce noise due to incorrect installation methods of their sealing devices, blade to blade guide covers, stern shaft protective covers, and propeller hub contact.
Marine propellers - The contact point between the propeller and its accessory components may occur at the propeller hub and stern shaft protective cover. In the dock inspection room, to ensure sufficient clearance at this location, the protective cover near the hub should be appropriately cut off to prevent further contact friction.
Imbalance caused by broken propeller blades in large bulk air conditioning propellers
Air conditioning large bulk cargo propeller - When the ship is traveling on a calm river surface and experiences sudden violent vibrations, the crew generally slows down the navigation, the vibration will be reduced, and it will continue to slow down, resulting in a decrease in vibration.
Air conditioning large bulk propeller - Analysis of the reasons for this situation: The occurrence of this situation in air conditioning large bulk propeller is likely due to the broken propeller blades, causing the propeller to lose balance and causing severe vibration of the ship.
Large container propellers - This situation may generally be due to poor performance of propeller materials, casting defects, severe corrosion of propeller blades, biological pollution in water, or propeller blades hitting cables, reefs, etc.
Large container propellers - Due to erosion, fracture, deformation, and other reasons caused by objects, the center of gravity of each propeller blade is unstable and loses balance, hitting the stern shaft and causing serious vibration in the shaft system or hull.
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