Abstract
One of the most important challenges in the development of the preliminary project of a ship is the estimation of propulsive power. This calculation can become a challenge for landing craft projects, since no specific estimation method for these ships is available, considering their special form characteristics. Using a systematized test database carried out in the ship model basin of Universidad Austral de Chile, a statistical model was generated through a multiple linear regression process to obtain an expression that serves to estimate the resistance for landing craft in preliminary stages of the project. Finally, the results of the regressions were compared with field measurements of three vessels in operation, showing a good agreement.
Highlights
The estimation of ship resistance in early project stages is of great importance, allowing the designer to evaluate hull shape, and estimate the propulsive power required
The present work seeks to develop a statistical method to estimate the total resistance landing craft, using an estimation method prepared with information obtained from 520 model tests, which took place at the Hydrodynamic Test Facility (Canal de Ensayos Hidrodinámicos) of Universidad Austral de Chile (CEH-UACh)
Resistance results from the KR method are shown using two bow shape factors (F2 = 0,3 and 0,5). These shape factors represent the limits for landing craft shaped bows according to the KR method
Summary
The estimation of ship resistance in early project stages is of great importance, allowing the designer to evaluate hull shape, and estimate the propulsive power required. Once the data is processed, multiple linear regressions were carried out, comparing these results with field measurements of barges in operation These comparisons confirm the proposed formula for the estimation of ship resistance in calm waters for shaped ships in preliminary design stages of vessels of this type. Their main characteristic is their ability to land on beaches using a lowerable ramp in their bow. In Chile, landing craft vessels are widely used today for transportation of goods and support of aquaculture activities in the sheltered waters of the southern regions These vessels provide large stability, large deck area, low draft and can land on beaches or ramps, providing ease of operation, despite their less optimal hydrodynamic performance. Minimum Maximum 1st Quartile Median 3rd Quartile Mean Variance (n-1) Typical deviation (n-1)
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