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문제 정의
- This study aimed a developing ice resistance charts based on model tests carried out in the KRISO ice tank. Length to beam (L/B) ratio, beam to draft (B/T) ratio, block coefficient (CB), volumetric coefficient (CV) and stem angle (α) were selected as parameters that highly affect icebreaking performance of the series hull forms.
제안 방법
- 85, two for B/T and L/B were conducted to study the effect of the geometric parameters on ice resistance. Additional model tests were also carried out to account for the effect of the stem angle, ice thickness and strength on the ice resistance. Non-dimensional ice resistance coefficients were summarized as a function of the volumetric coefficient (CV) for various speeds.
- 05 were developed. Additional model tests were performed for two more hull forms varying B/T of 2.5 and 3.5 while other parameters were kept the same as the basic hull form. In addition, six more sheets varying B/T values were also developed assuming that the trends of the ice resistance were similar to those obtained for other CB and L/B values.
- The towing guide device was also installed on the bow to prevent the yaw and sway motion. All ice resistance tests conducted in this study were performed and various measured values were obtained by a computerized data acquisition system.
- Ice resistance tests were carried out in level ice, beginning with the basic hull form, in the low speed regions. Four more tests for CB variations from 0.65 to 0.85, two for B/T and L/B were conducted to study the effect of the geometric parameters on ice resistance. Additional model tests were also carried out to account for the effect of the stem angle, ice thickness and strength on the ice resistance.
- 0 knots considering the development range of the series chart. Furthermore, additional resistance tests for the basic hull were also carried out varying the ice thickness, ice strength and stem angles to obtain the correction charts of the three parameters.
- Ice resistance tests for the series hull forms were performed, and the comparative analysis was carried out considering the block coefficient (CB), L/B, B/T and stem angle (α) variations.
- From the figure, it is found that ice resistance increases as B/T increases. In order to develop ice resistance correction charts based on stem angles, ice thickness and strength, extra model tests were performed, varying the parameters for a minimum number of model tests. Extra tests were also performed with the ice strength kept constant at 600 kPa, while ice thickness varied from 0.
- 0 to develop the series charts estimating ice resistance coefficients. Model tests were carried out for the basic hull and extra tests were performed at the same block coefficient varying L/B of 5.0 and 7.0, and B/T of 2.5 and 3.5 at the speed of 2, 3, and 5 knots. The experimental results for various parameters showed reasonable accuracy except in a low speed region due to non-uniform ice thickness and strength and measurement errors etc.
- The basic hull form was selected for the geometric parameters of CB 0.75, L/B 6.0, a stem angle 25° and B/T 3.0 to develop the series charts estimating ice resistance coefficients.
- 18 sheets composed of combinations of three B/Ts and six CBs were developed as a parameter of CV in the low speed regions, and three correction charts were also developed for different stem angle, ice thickness and strength. The developed series charts were applied to predict ice resistance for existing icebreaking ships including ARAON, and the results indicated high correspondence with full-scale data. It is expected that the developed ice series chart can be used in an early design stage of icebreaking ships.
- 0 m in length) were manufactured considering the test conditions in the ice tank. The surfaces of the models were gelcoated using Magnesium Silicate in order to satisfy the standard friction coefficient of the ice-hull.
- This study aimed at developing ice resistance charts based on model tests for 13 series hull forms in an ice tank of KRISO. The series hull forms were designed varying the geometric parameters such as B/T, L/B, CB, and stem angle (α), which significantly influence icebreaking performance.
- 05 while keeping other parameters constant. Two more model tests for L/B of 5.0 and 7.0 were carried out and the resistance characteristics were rearranged as a function of CV.
데이터처리
- 11-14. Once the geometric parameters were given for specified hull form, the volumetric coefficient was calculated and the total resistance coefficients were obtained for various Froude numbers as a function of the volumetric coefficient. As shown in the figures, the developed series charts showed high correspondence to the conventional series of hull form for the changes in B/T, CB and L/B.
- The developed series charts were validated by plotting the ice resistance coefficient on the series chart. For some typical cases, sample computed results were obtained for different values of B/T, CB and L/B as shown in Figs.
이론/모형
- 0 knots. The reason for this large error is the low resistance coefficient of ARAON, because the dimensions of ARAON were too small to apply the charts. However, the developed charts provide the icebreaking resistance of large icebreakers with reasonable accuracy at the initial design stage.
후속연구
- Applying newly developed ice resistance series charts for the existing icebreakers, the estimated values showed high correspondence both quantitatively and qualitatively. The ice resistance series charts in this study will be used in designing the icebreaking hull form and compared with full-scale ice resistance measurement data in the near future.
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