Tailshaft

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The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform

D.a. Taylor - One of the best experts on this subject based on the ideXlab platform.

  • Shafting and propellers
    Introduction to Marine Engineering, 1990
    Co-Authors: D.a. Taylor
    Abstract:

    Shafting and propellers play a crucial role in the proper functioning of ships and this chapter discusses these two components. The transmission system on a ship transmits power from the engine to the propeller. It is made up of shafts, bearings, and the propeller itself. The different items in the system include the thrust shaft, intermediate shafts, and the Tailshaft. These shafts are supported by the thrust block, intermediate bearings, and the sterntube bearing. A sealing arrangement is provided at either end of the Tailshaft with the propeller and cone completing the arrangement. The thrust block transfers the thrust from the propeller to the hull of the ship. Shaft bearings are of two types, the aftermost tunnel bearing and all others. The aftermost tunnel bearing has a top and bottom bearing shell and the other shaft bearings only support the shaft weight. The sterntube bearing supports the Tailshaft and a considerable proportion of the propeller weight. It also prevents the entry of sea water to the machinery space. The propeller consists of a boss with several blades of helicoidal form attached to it and when rotated it “screws” or thrusts its way through the water. Finally, the chapter discusses cavitation and propeller maintenance tips.

Stan Liviu-constantin - One of the best experts on this subject based on the ideXlab platform.

  • Propellers and Shafting for Sustainable Shipping
    Advances in Environmental Engineering and Green Technologies, 2014
    Co-Authors: Stan Liviu-constantin
    Abstract:

    The importance of the line shafting, Tailshaft, propeller, and thrust shaft cannot be over-emphasised. Failure of any one of them will rend the ship inoperable with possible disastrous consequences. Single line shafting is used on the majority of ships, but not in passenger ships and on short voyage ro-ro services where twin screws are employed. Propellers, because they are outside the ship, are often neglected and are usually only inspected when the ship is in drydock. More frequent examination can be undertaken when a ship is alongside and the shafting is being rotated with the turning gear. Damage to the propeller blade can lead to vibrations being set up in the line shafting causing overheating of the shafting bearings, main thrust, etc. The selection of shafting and propeller materials is usually within manufacturers’ specifications and complies with the various classification society requirements as well as the statutory requirements of governments.

David G. Lewicki - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Determination of AH-64 Apache Tailshaft Hanger Bearing Vibration Characteristics with Seeded Faults
    2009
    Co-Authors: Brian Dykas, Timothy Krantz, Harry J. Decker, David G. Lewicki
    Abstract:

    Abstract : A series of seeded fault experiments are conducted to evaluate the characteristics of degraded AH-64 Apache helicopter forward hanger bearings, which support the tail rotor drive shaft. This bearing is one of a handful of maintenance-intensive components originally identified for condition-based maintenance proof of principle. Several fault modes are simulated in the test specimens including salt water corrosion, sand contamination, and trench flaws on the races. The vibration characteristics of the faulted bearings are then recorded in a component-level bearing test stand, and analyzed to corroborate or modify current fault detection methodology in the aircraft. For the bearings with substantial amounts of damage or removed material, the vibration response showed increase content in a portion of the spectrum not monitored by the condition indicators now in use. Impact experiments suggest this is a result of the bearing vibration exciting the hanger assembly natural frequencies.

Brian Dykas - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Determination of AH-64 Apache Tailshaft Hanger Bearing Vibration Characteristics with Seeded Faults
    2009
    Co-Authors: Brian Dykas, Timothy Krantz, Harry J. Decker, David G. Lewicki
    Abstract:

    Abstract : A series of seeded fault experiments are conducted to evaluate the characteristics of degraded AH-64 Apache helicopter forward hanger bearings, which support the tail rotor drive shaft. This bearing is one of a handful of maintenance-intensive components originally identified for condition-based maintenance proof of principle. Several fault modes are simulated in the test specimens including salt water corrosion, sand contamination, and trench flaws on the races. The vibration characteristics of the faulted bearings are then recorded in a component-level bearing test stand, and analyzed to corroborate or modify current fault detection methodology in the aircraft. For the bearings with substantial amounts of damage or removed material, the vibration response showed increase content in a portion of the spectrum not monitored by the condition indicators now in use. Impact experiments suggest this is a result of the bearing vibration exciting the hanger assembly natural frequencies.

Shulin Duan - One of the best experts on this subject based on the ideXlab platform.

  • Elastohydrodynamic Lubrication Analysis of Marine Sterntube Bearing Based on Multi-body Dynamics
    Energy Procedia, 2012
    Co-Authors: Hui Xing, Shulin Duan
    Abstract:

    Abstract To predict and analyze accurately the lubrication characteristics and its influencing factors of marine sterntube bearings, coupling simulation between EHD and MBD for sterntube bearings of marine diesel engine propulsion system was carried out. FE models for crankshaft and main bearings of a two-stroke low-speed marine diesel engine, intermediate shaft, Tailshaft, intermediate bearings and sterntube bearings of a chemical carrier were established, and the results files generated from reduced FE models by employing substructure methods were entered into MBD model. Sterntube bearing forces, load distribution, orbital path, minimum oil film thickness(MOFT) and total friction power loss on fore sterntube bearing and aft sterntube bearing in one working cycle under rated working conditions were investigated. Simulation results show that the sterntube bearings were safe enough for normal operation, the vertical load and the total friction power loss on aft sterntube bearing were significantly higher than that of fore sterntube bearing.