The influence of ship length, length to beam ratio, beam to draft ratio, prismatic coefficient, non-dimensional radius of gyration and Froude number upon significant amplitude of coupled heaving and pitching motions of trawler hull forms for six different sea states has been studied. For this purpose, 540 trawler hull forms have been generated from Doust trawler series to cover appropriate ranges of the design parameters. Seakeeping behavior of these forms has been studied by using an established ship motion computer program and regression models of significant seakeeping events have been derived. Through this study, it is believed that a method has been produced for the seakeeping evaluation of trawler forms during the early design stages, hence allowing for the design of safer and more seakindly trawler designs.
In the present paper, first 13 hull forms of fishing boats with different block coefficients were generated. Later, 26 hull forms of fishing boats with two different ratios of length to beam were generated by utilizing previous hull forms of fishing boats mentioned. In total, 39 fishing boats were generated. This series is called "Fishing Boats Series of ITU" (Istanbul Technical University). In this Series, the forms of the body stations and beams of the boats are the same for equal block coefficient and different lengths. The ratio of the beam of any station at any waterline to the beam of boat, Bz/B varies with respect to block coefficient, CB. These variations have been represented with the third-degree polynomials. Thus, a hull form of the fishing boat in the desired length and block coefficient can be obtained by using these polynomials. For this purpose, a computer program called "Turetme" was developed. Finally, by using this program, three hull forms of fishing boats were obtained and presented here.
ÖzYapılan çalışmada salmalı yatlar için yelken parametrelerinin boyutlarının en uygun şekilde belirlenmesi ayrıca belirlenen yelken ve tekne için performans değerlerinin tahmin edilmesi amaçlanmıştır. Bu amaç doğrultusunda üretilen tekneler incelenerek, yaygın olarak kullanılmakta olan gemi boyu aralığı 9 ile 20 m arasında belirlenmiştir. Bu aralıkta hesaplamalar ve tahminler yapılabilmesi için 9,15; 14,25 ve 19,50 m tam boya sahip 3 adet tekne oluşturulmuştur. Her bir tekneye karşılık gelecek şekilde 81 adet farklı yelken donanımı oluşturularak 6, 12 ve 20 knot rüzgâr hızlarında ve her bir rüzgâr hızı için rüzgârın karşıdan alındığı durumda 45, 90 ve 110 derece açılarda, rüzgârın arkadan alındığı durumda ise 90, 120 ve 140 derece açılarda incelemeler yapılmıştır.Yapılan incelemeler sonucunda elde edilen verilerin en iyi %25'inin ortalama değerlerinden yola çıkılarak 9 ile 20 m boy aralığında tüm rüzgâr koşulları için kullanışlı sayılabilecek yelken donanım boyutlarının belirlenmesi mümkün olmuştur. Ayrıca istenilen boydaki teknenin tekne hızı, sürüklenme kuvveti ve bayılma açısı performans değerlerinin tahmin edilebilmesi %2'nin altındaki hata oranıyla sağlanmıştır. AbstractThe study was carried out in order to determine the dimensions of the sailing parameters for the sailing yachts in the most appropriate way and to estimate the performance values for the determined sail and boat. The length overall range, which is widely used for this purpose, is determined between 9 and 20 m. In order to make calculations and estimations in this range, 3 boats having 9. 15, 14.25 and 19.50 m full size were formed. 81 different sailing equipment was created to correspond to each boat. For each boat and sailing equipment, it was examined at wind speeds of 6, 12 and 20 knots and in angles of 45, 90 and 110 degrees in wind direction. In the case of the opposite direction of the wind, 90, 120 and 140 degree angles were examined.Based on the average of the 25% of the results of the surveys, it was possible to determine the dimensions of sailing equipment that could be considered useful for all wind conditions between 9 and 20 m in length. In addition, estimation of boat speed, drift force and heel angle performance values of the desired length of the vessel is provided with an error rate of less than 2%.
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