Abstract
The mechanical model of the rudder stock is established. The rudder stock can be simplified into a statically indeterminate beam. The reaction force from the support, torque and bending moment within the length of the rudder stock can be solved using three-moment equation. The stress in the profile of the stock is checked using the fourth strength theory. The calculation is directly carried out based on Ship Specification of Classification and Shipbuilding. Compared with the conventional methods, the results show that three-moment equation is correct and available in check calculation.
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