Ship Displacement Form Factor Prediction Through the Application of the Robust Least Squares Method

A ship model test is considered one of the most effective methods of determining the size of a ship's drag, where the ship's shape factor determines the ship's drag at full scale. The use of the Prohaska method to determine the value of the form factor can be carried out experimentally by drawing a ship model in the towing tank basin with a Fr of 0.1-0.2. This research is a continuation of the research of Widodo et al. by utilizing the main ship data such as LWL, B, CB, CP, CM, WSA, T, and ∆. The S-estimation RLS method is used. In this method, the error value obtained is 0.1-3%, which is a bias value between the actual and the predicted values. This very small bias value can be used as a reference for using the regression equation in order to obtain form factor values as an alternative to the Prohaska method. Subsequent research is the process of validating the form factor from the s-estimation RLS and the Prohaska method through the displacement ship model resistance test data.