Form Factor Prediction Based on Ship Model Test Data by Statistical Method

Widodo, Widodo; Santoso, Ari; Erwandi,; Baidowi, Achmad

doi:10.1088/1755-1315/1081/1/012017

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…This study uses the least squares multiple linear regression method to determine the Form Factor, which will be compared with the Prohaska method. The principle dimensions of ship displacement (LWL, B, T, CB, CM, CP, and WSA, ) will be the predictor variables, where the previous research conducted by Widodo et al (2022) found outlier data [21].…”

Section: Form Factormentioning

confidence: 99%

Ehp Value of Mini LNG Ship With Form Factor From Prohaska and Irls Method Using Ship Resistance Testing Data

Widodo,

Santoso,

Erwandi

et al. 2023

Jurnal Teknologi

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The ship model test was believed to be one of the effective methods for figuring out the boundaries and reliability of the ship's horsepower. The ship's form factor determines a full-scale ship's effective horsepower. Determination of the form factor value can be done experimentally through the Prohaska method. The new method proposed in this study is employed the regression Iteratively Reweighted Least Squares (IRLS) method by utilizing the principle dimension of the ship, such as LWL, B, CB, CP, CM, WSA, T, ∆. etc. The Indonesian Hydrodynamics Laboratory has a database of ships with various principle dimensions which have undergone the towing model test. Through the database, the form factor can be predicted with the IRLS method. The method is then verified and validated with the Prohaska method. The result shows a good agreement with the Prohaska method. The obtained results from the IRLS method also show that the EHP & Resistance calculations are identical with old fashion Prohaska methods. The residual bias factor established by the IRLS method was verified in comparison to the value of the form factor generated by the Prohaska method. Comparison between the two methods results in a small error.

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Section: Form Factormentioning

confidence: 99%

Ehp Value of Mini LNG Ship With Form Factor From Prohaska and Irls Method Using Ship Resistance Testing Data

Widodo,

Santoso,

Erwandi

et al. 2023

Jurnal Teknologi

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“…-While the coefficient of frictional resistance (CF) is obtained from the calculation with the equation: -Prediction of form factors (1+k) [43,44], obtained using the Prohaska method [45,46]. -The coefficient of total vessel resistance (CT) and Correlation Allowance (CA) [24] is the additional coefficient to the ship model's correlation resistance.…”

Section: Determination Of the Ship's Resistancementioning

confidence: 99%

Numerical Analysis of Modified Angle of Entrance and Ducktail Addition of the 1,500 Gt Ro-Ro Ferry Hull Validated With Ship Model Resistance Test

Mintarso,

Semin,

Erwandi

et al. 2023

Jurnal Teknologi

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The main problem of ferry ships is maintaining the speed due to ship resistance. There are many efforts to reduce the resistance by modifications of them. This study aims to reduce resistance due to modification of the hull form on the bow Angle of Entrance (AoE) and ducktail addition at the transom stern. The object of the research is a 1,500 GT ro-ro ferry. The AoE minimizes wave resistance and improves flow patterns, while the ducktail reduces the negative effects of the circulation zone on the wetted transom so that waves and wake are reduced. Computational Fluid Dynamics (CFD) was used to analyze these modifications. The final results of the numerical simulation are then verified by the ship model resistance test in the towing tank. Tests were conducted in calm water conditions at a draft of 3.30 meters with a speed variation of 10 - 18 knots. The results show that with the combination of AoE and Ducktail, at ship speeds of 13 to 18 knots, the reduction in resistance from CFD ranges from 13.13% - 16.69% while the experimental results range from 16.00% - 16.54%. While separately the AoE modification is between 8.89% – 12.19% and ducktail is 3.12% -3,62%.

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Form Factor Prediction Based on Ship Model Test Data by Statistical Method

Cited by 2 publications

References 12 publications

Ehp Value of Mini LNG Ship With Form Factor From Prohaska and Irls Method Using Ship Resistance Testing Data

Ehp Value of Mini LNG Ship With Form Factor From Prohaska and Irls Method Using Ship Resistance Testing Data

Numerical Analysis of Modified Angle of Entrance and Ducktail Addition of the 1,500 Gt Ro-Ro Ferry Hull Validated With Ship Model Resistance Test

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