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Journal articles on the topic 'Seakeeping'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 April 2023

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1

Dubrovsky, Victor. "Seakeeping index as generalized indicator of ship seakeeping performance." Transactions of the Krylov State Research Centre 4, no. 398 (November 15, 2021): 81–86. http://dx.doi.org/10.24937/2542-2324-2021-4-398-81-86.

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Object and purpose of research. This paper discusses the possibility of a ship design process that would consider seakeeping performance to the greatest extent possible. The purpose of this study was to work out a numerical indicator, an index, reflecting all the seakeeping properties relevant for suitability of given ship to its intended operational conditions. Materials and methods. The study was based on the data about various operational parameters of the ship under investigation. These data were further synthesized so as to obtain the most comprehensive picture of ship seakeeping behaviour in different operational conditions. Main results. The study yielded the method and the algorithm for the “seakeeping index” as an average annual probability that seakeeping performance of given ship will be adequate to the conditions of given water area. The method sug-gested in this paper for a generalized comparison of seakeeping properties can handle whatever variety of target parameters and whatever seakeeping standards for any kind of ship intended to operate in given water area, and the result of this comparison is given in form of a single number that can be further used to improve seakeeping parameters of given ship, as well as to estimate possible time of its fully-featured operation in given conditions, including cost efficiency analysis. Conclusion. For more accurate comparison, it is recommended to analyse target parameters as functions of both ship speed and wave heading angle keeping in mind that the assumption introduced, i.e. that these curves as functions of wave heading angle are cosines, is not necessarily true. In other words, it is recommended to rely on more accurate data, experimental or analytical, so as to take into account the effect of apparent frequencies upon these curves.
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2

Magarovsky, V. V., K. V. Kurchukov, V. G. Platonov, V. P. Sokolov, and M. S. Rudenko. "Bow shape design for river-sea vessels with increased seakeeping performance." Transactions of the Krylov State Research Centre 4, no. 402 (October 14, 2022): 19–32. http://dx.doi.org/10.24937/2542-2324-2022-4-402-19-32.

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Object and purpose of research. The purpose of this study was to develop a bow shape with increased block coefficient for river-sea vessels so as to improve their seakeeping at high sea states. Subject matter and methods. This paper qualitatively analyses the physics of wave effects upon a moving ship, ranking the contribution of specific factors and solving the task of improving the seakeeping performance through optimization of hull lines. Main results. The study highlighted the peculiarities of intense wave effects upon ship bow and suggested the hull lines offering a good seakeeping performance for a hull with high block coefficient. Seakeeping tests of initial and modified hull models at Krylov State Research Centre Seakeeping Basin have confirmed the theoretical results. Conclusion. The study outlined one of the ways to improve seakeeping performance of river-sea ships with increased block coefficient at high sea states.
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3

Domnisoru, Leonard. "On seakeeping capabilities evaluation of a large off-shore barge." Analele Universităţii "Dunărea de Jos" din Galaţi Fascicula XI Construcţii navale/ Annals of "Dunărea de Jos" of Galati Fascicle XI Shipbuilding 44 (December 3, 2021): 23–30. http://dx.doi.org/10.35219/annugalshipbuilding/2021.44.04.

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Usual specially designed barges are involved in the off-shore operations that have to be evaluated by several criteria, inclusive of the seakeeping capabilities. The paper includes a comparative seakeeping study of two constructive versions for a large off-shore barge with a length of 189 m, having different breadths 40 m and 50 m. Both constructive versions are on the full cargo 23000 t condition. The seakeeping analyses are done with our own software DYN-OSC, developed by linear potential Lewis’s strip theory. The seakeeping studies are done in oblique irregular waves with a maximum height of 12 m and for the off-shore barge maximum operation speed of 7 knots. The results of this comparative study reveal the differences in the seakeeping operation capabilities for the two off-shore barge constructive versions.
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4

Fitriadhy, Ahmad, Nur Amira Adam, N. Amalina, and S. A. Azmi. "SEAKEEPING PREDICTION OF DEEP-V HIGH SPEED CATAMARAN USING COMPUTATIONAL FLUID DYNAMICS APPROACH." SINERGI 22, no. 3 (October 29, 2018): 139. http://dx.doi.org/10.22441/sinergi.2018.3.001.

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Seakeeping is the dynamic response of the ship in waves that may affect to passenger’s uncomfortability due to a harsh environmental condition. Therefore, an extensive assessment of seakeeping performance in the initial step of ship design is necessarily required. The authors here proposed to analyze the seakeeping performance of ‘deep-V’ high speed catamaran using Computational Fluid Dynamics (CFD) approach. Several effects of Froude number (Fr), wave-length (
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5

Rizal, Nandiko, Dian Purnama Sari, Beny Cahyono, Dedy Dwi Prastyo, Baharuddin Ali, and Erdina Arianti. "Experimental Seakeeping and Uncertainty Analysis of Benchmark Ship Model in Regular Head and Beam Waves." Naše more 70, no. 1 (March 2023): 48–57. http://dx.doi.org/10.17818/nm/2023/1.5.

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Confidence levels of the seakeeping experiment results can be assessed through uncertainty analysis. The seakeeping experiments with a free-running model system were carried out in the manoeuvring and ocean engineering basin (MOB) at the Indonesian Hydrodynamic Laboratory (IHL) using uncertainty techniques to improve the experiment quality. The method used is the International Organization for Standardization, Guide for Uncertainty of Measurements (ISO-GUM), type A and B uncertainty, which is the foundation for the uncertainty analysis for seakeeping experiment recommendations released by the International Towing Tank Conference (ITTC). This research aims to determine the combined uncertainty value of the seakeeping experiment on a benchmark ship model with a scale of 1:62, representing the full scale of 186 meters. Seakeeping testing is carried out under head and beam waves, each with regular waves at one wave height (Hs) with three different wave periods (Tw). The experimental seakeeping result, generally, has the same tendency in each heave, pitch, and roll motion mode. The expanded uncertainty with 95% confidence level of the RAO-Heave uncertainty in all period conditions is always less than 3%, RAO-Pitch uncertainty in all period conditions is always less than 1%, and RAO-Roll uncertainty in all period conditions is always less than 1.2%. These uncertainties are quite small.
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6

Calisal, Sander M., David Howard, and Jon Mikkelsen. "A Seakeeping Study of the UBC Series." Marine Technology and SNAME News 34, no. 01 (January 1, 1997): 10–23. http://dx.doi.org/10.5957/mt1.1997.34.1.10.

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The University of British Columbia (UBC) and the British Columbia Research Incorporated (BCRI) collaborated to design a fishing vessel suitable for use on the west coast of Canada. This vessel, called the UBC Series parent hull form, was designed to have a large aft deck area and a volumetric coefficient comparable to those of modern Canadian fishing vessels. The resistance characteristics of this hull were improved without compromising on functionality and usable space. A resistance algorithm developed from the results for a systematic series of low-L/B displacement-type vessels, the UBC Series, was previously published (Calisal&McGreer, 1993). However, during the design process, the seakeeping performance of the vessel was never addressed. This paper describes the seakeeping performance of the UBC series in head seas. An algorithm, developed from the results of the model tests, can be used to calculate the seakeeping response of similar low L/B vessels. To calibrate the seakeeping measurement procedure, tank instrumentation, and data collection system, the ITTC Standard Seakeeping hull form (the S-175 hull form) was tested and the results were compared against published results for this hull form. The same techniques used for the standard hull form were then used to measure the seakeeping performance of the UBC Series. Possible application of the algorithm for non-UBC Series forms is also discussed.
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7

Ljulj, Andrija, and Vedran Slapničar. "Seakeeping Performance of a New Coastal Patrol Ship for the Croatian Navy." Journal of Marine Science and Engineering 8, no. 7 (July 15, 2020): 518. http://dx.doi.org/10.3390/jmse8070518.

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This paper presents seakeeping test results for a coastal patrol ship (CPS) in the Croatian Navy (CN). The full-scale tests were conducted on a CPS prototype that was accepted by the CN. The seakeeping numerical prediction and model tests were done during preliminary project design. However, these results are not fully comparable with the prototype tests since the ship was lengthened in the last phases of the project. Key numerical calculations are presented. The CPS project aims to renew a part of the Croatian Coast Guard with five ships. After successful prototype acceptance trials, the Croatian Ministry of Defence (MoD) will continue building the first ship in the series in early 2020. Full-scale prototype seakeeping test results could be valuable in the design of similar CPS projects. The main aim of this paper is to publish parts of the sea trial results related to the seakeeping performance of the CPS. Coast guards around the world have numerous challenges related to peacetime tasks such as preventing human and drug trafficking, fighting terrorism, controlling immigration, and protecting the marine environmental. They must have reliable platforms with good seakeeping characteristics that are important for overall ship operations. The scientific purpose of this paper is to contribute to the design process of similar CPS projects in terms of the development of seakeeping requirements and their level of fulfillment on an actual ship.
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8

Carlo, D., Maurizio Verri Pagani, and Anna Zaretti. "The problem of seakeeping." Applicable Analysis 53, no. 1-2 (April 1994): 19–39. http://dx.doi.org/10.1080/00036819408840241.

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9

Söding, Heinrich. "Fast accurate seakeeping predictions." Ship Technology Research 67, no. 3 (May 13, 2020): 121–35. http://dx.doi.org/10.1080/09377255.2020.1761618.

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10

Pranatal, Erifive. "ANALISIS PENGARUH SUDUT DEADRISE PLANNING CRAFT TERHADAP STABILITAS DAN SEAKEEPING." Wave: Jurnal Ilmiah Teknologi Maritim 14, no. 2 (February 8, 2021): 61–72. http://dx.doi.org/10.29122/jurnalwave.v14i2.4454.

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Perancang kapal berusaha untuk memperoleh stabilitas dan seakeeping yang baik terlebih untuk kapal cepat bertipe planning hull. Tipe ini memiliki deadrise sehingga lambungnya bentuk ‘V’ sehingga tujuan penelitian ini adalah untuk mengetahui pengaruh besar sudut deadrise terhadap stabilitas dan seakeeping. Objek penelian adalah kapal planning hull Series 62: parent model 4677-1. Metode penelitian menggunakan simulasi komputer dengan bantuan software dan perhitungan stabilitas tersebut dibandingkan dengan metode Krylov II. Hasil penelitian menyatakan bahwa tiga variasi deadrise yaitu 10°, 13°, dan 18°, sudut deadrise yang kecil memberikan stabilitas yang baik tetapi mengurangi olah gerak kapal (seakeeping) sedangkan sudut deadrise yang besar akan mengurangi kemampuan stabilitas kapal tetapi memiliki seakeeping yang baik. Ketiga model tersebut sama-sama memenuhi regulasi stabilitas IMO. Sehingga besar sudut deadrise yang direkomendarikan untuk penelitian ini adalah 13°.
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11

Luhulima, Richard Benny, Fella Gaspersz, and Ruth P. Soumokil. "STUDI KORELASI HAMBATAN DAN SEAKEEPING KAPAL TRIMARAN UNTUK DAERAH PERAIRAN MALUKU." ALE Proceeding 1 (July 17, 2021): 63–69. http://dx.doi.org/10.30598/ale.1.2018.63-69.

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Perairan Maluku termasuk tipikal perairan yang relatif tenang diantara pulau-pulau yang berdekatan dan sangat bergelombang untuk laut yang terbuka dan jarak antara pula-pulau yang cukup berjauhan. Penelitian difokuskan pada perhitungan hambatan dan dilanjutkan dengan perhitungan seakeeping untuk perairan tenang dan bergelombang. Penelitian tentang hambatan dilakukan dengan teknik CFD menggunakan CFX-code dan penelitian tentang seakeeping dilakukan dengan teknik CFD (ANSYS AQWA).Hasil kajian melalui numerik menunjukkan bahwa interferensi komponen hambatan pada lambung trimaran terhadap perubahan jarak antara lambung secara melintang (S/L). Semakin kecil jarak antara lambung trimaran (S/L) maka semakin besar hambatan dan interferensi/interaksi komponen hambatan yang terjadi. Kemudian korelasi yang terlihat antara hambatan dan seakeeping adalah adanya perbedaan karena adanya interferensi semakin besar interferensi maka gerakan heave dan pitch semakin berkurang. Namun inteferensi tidak mempengaruhi terhadap gerakan roll. Hasil analisa pengujian dan numerik menunjukkan bahwa pada S/L=0,4 menunjukkan hasil yang sangat baik untuk permorma hambatan dan seakeeping. Hasil yang diperolehdibandingkandenganpublished datadanmenunjukkankesesuaianhasil yang cukupbaik. Hasil penelitian ini diharapkan dapat memperkaya dan memperkuat database dalam mempresentasikan korelasi hambatan terhadap olah gerak pada lambung kapal trimaran dan selanjutnya dapat diaplikasikan secara langsung dalam perhitungan hambatan dan seakeeping yang digunakan pada tahap desain (preliminary design).
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12

Bi, Xiaosheng, Jiayuan Zhuang, and Yumin Su. "Seakeeping Analysis of Planing Craft under Large Wave Height." Water 12, no. 4 (April 2, 2020): 1020. http://dx.doi.org/10.3390/w12041020.

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The purpose of this paper is to conduct a seakeeping analysis of planing craft under regular wave with large wave height. To obtain a reliable numerical method to simulate the sailing of planing craft in waves, Reynolds-averaged Navier–Stokes (RANS) solver and overset method are adopted. The motion response and resistance of the planing craft USV01 in regular wave were numerical predicted and compared with the corresponding seakeeping experimental tests. The results show that the numerical method has high accuracy. For further study, a new planing craft whose name is improved vessel is selected for simulation, the low steaming of the USV01 and improved vessel in regular wave with large wave height was simulated, and the seakeeping of the two vessels was studied. The analysis about the influence of wave length on the motion response and navigation configurations of the improved vessel under regular wave was carried out. Meanwhile, the influence of speed on different navigation configurations of the improved vessel was also analyzed. The improved vessel can provide better seakeeping, and a reduction in the speed of the vessel will benefit its seakeeping, irrespective of its navigation configuration.
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13

Tuitman, Johan T., Šime Malenica, and Riaan van't Veer. "Generalized Modes in Time-Domain Seakeeping Calculations." Journal of Ship Research 56, no. 04 (December 1, 2012): 215–33. http://dx.doi.org/10.5957/jsr.2012.56.4.215.

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The concept of "generalized modes" is to describe all degrees of freedom by mode shapes and not using any predefined shape, like rigid body modes. Generalized modes in seakeeping computations allow one to calculate the response of a single ship, springing, whipping, multibody interaction, etc., using a uniform approach. The generalized modes have already been used for frequency-domain seakeeping calculations by various authors. This article extents the generalized modes methodology to be used for time-domain seakeeping computations, which accounts for large-amplitude motions of the rigid-body modes. The time domain can be desirable for seakeeping computations because it is easy to include nonlinear load components and to compute transient response, like slamming and whipping. Results of multibody interaction, two barges connected by a hinge, whipping response of a ferry resulting from slamming loads, and the response of a flexible barge are presented to illustrate the theory.
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14

Puspita, Hery Indria Dwi. "ANALISA GERAKAN KAPAL IKAN BERCADIK SEMI-CIRCULAR DI PERAIRAN PUGER JEMBER." Jurnal Elemen 4, no. 2 (December 29, 2017): 96. http://dx.doi.org/10.34128/je.v4i2.57.

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Kapal ikan di pelabuhan Puger terdiri dari beberapa jenis, salah satunya adalah kapal ikan bercadik. Bentuk dan bahan dari kapal ikan bercadik di Puger hanya terbuat dari bambu, sehingga perlu adanya pengembangan bentuk cadik bambu menjadi bentuk cadik semi-circular untuk menambah kualitas hidrodinamika yang lebih baik. Bentuk pengembangan kapal ikan harus sesuai dengan kondisi di Perairan Puger dan harus memenuhi kapasitas dari faktor keamaaan dan hidrodinamika dari kapal ikan bercadik di Perairan Puger Jember. Oleh karena itu, diperlukan analisa gerak (seakeeping) dari kapal ikan bercadik. Analisa gerak (seakeeping) kapal ikan bercadik tersebut u ntuk mengetahui kemampuan kapal bertahan dalam kondisi berbahaya saat beroperasi. Kemudian, dari analisa seakeeping dari kapal ikan bercadik semi-circular dapat diketahui peforma dari pengembangan kapal ikan bercadik semi-circular dengan mengadaptasi ukuran utama dari kapal ikan yang telah ada di Puger. Metode yang digunakan adalah dengan pengukuran langsung dimensi utama dari bentuk body dari kapal ikan di perairan Puger Jember. Selanjutnya hasil pengukuran tersebut digambar kembali dengan mengganti bentuk cadik menjadi bentuk cadik semi-circular, dan kemudian dilakukan evaluasi seakeeping kapal ikan bercadik semi-circular. Berdasarkan hasil evaluasi seakeeping kapal memiliki kriteria gerakan heave, pitch, dan roll yang lebih baik dan sesuai dengan kondisi perairan di Puger.
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15

Sariöz, Kadir, and Ebru Sariöz. "Habitability Assessment of Passenger Vessels Based on ISO Criteria." Marine Technology and SNAME News 42, no. 01 (January 1, 2005): 43–51. http://dx.doi.org/10.5957/mt1.2005.42.1.43.

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The seakeeping performance of passenger vessels is generally assessed by using a procedure based on the probability of exceeding specified ship responses in a sea environment particular to the ship's route. The percentage of time the responses are below specified limits in a particular sea state can be determined from an oceanographic database through application of the response amplitude operators. However, this procedure is strongly affected by the chosen limiting criteria. This is particularly the case for passenger vessels where many conflicting criteria are used to assess the effect of motions and accelerations on comfort and well-being of passengers. This paper investigates the effect of seakeeping criteria on habit-ability performance assessment for passenger vessels. Conventional seakeeping performance measures are evaluated for various levels of vertical accelerations defined by the ISO 2631 standard. It is shown that the estimated habitability performance of a passenger vessel greatly depends on the level of limiting value selected as the seakeeping criteria.
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16

Ahmad Fitriadhy, Syarifuddin Dewa, Nurul Aqilah Mansor, Nur Amira Adam, Ng Cheng Yee, and Kang Hooi Siang. "CFD Investigation into Seakeeping Performance of a Training Ship." CFD Letters 13, no. 1 (January 31, 2021): 19–32. http://dx.doi.org/10.37934/cfdl.13.1.1932.

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The numerous ship accidents at sea have usually resulted in tremendous loss and casualties. To prevent such disastrous accidents, a comprehensive investigation into reliable prediction of seakeeping performance of a ship is necessarily required. This paper presents computational fluid dynamics (CFD) analysis on seakeeping performance of a training ship (full scale model) quantified through a Response of Amplitude Operators (RAO) for heave and pitch motions. The effects of wavelengths, wave directions and ship forward velocities have been accordingly taken into account. In general, the results revealed that the shorter wavelengths (l/L ? 1.0) have insignificant effect to the heave and pitch motions performance of the training ship, which means that the ship has good seakeeping behavior. However, the further increase of wavelength was proportional with the increase of RAO for her heave and pitch motions; whilst it may lead to degrade her seakeeping quality. In addition, the vertical motions behavior in the following-seas dealt with higher RAO as compared with case of the head-seas condition. Similarly, the subsequent increase of the ship forward velocity was prone to relatively increase of the RAO for her heave and pitch motions especially at l/L ? 2.0. It was merely concluded that this seakeeping prediction using CFD approach provides useful outcomes in the preliminary design stage for safety assessment of the training ship navigation during sailing.
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17

Sarıöz, Ebru. "Minimum ship size for seakeeping." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 226, no. 3 (March 28, 2012): 214–21. http://dx.doi.org/10.1177/1475090212440068.

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18

Ćatipović, Ivan, Maro Ćorak, Joško Parunov, and Neven Alujević. "Seakeeping experiments on damaged ship." Ships and Offshore Structures 14, sup1 (December 25, 2018): 100–111. http://dx.doi.org/10.1080/17445302.2018.1559911.

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19

Wen, Poul, and Arif Fadillah. "The Effect of Trim on Stability and Seakeeping of Tanker, Container, and Bulk Carrier." IOP Conference Series: Earth and Environmental Science 972, no. 1 (January 1, 2022): 012037. http://dx.doi.org/10.1088/1755-1315/972/1/012037.

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Abstract Stability and seakeeping are important factor that must be owned by a ship because it related to the safety of the ship, meanwhile the trim also affecting the ship operation. The study has a purpose to find out the impact of the trim to the stability and seaworthiness of the ship. The analysis is carried out on 3 types of ships, namely tankers, containers, and bulk carriers. A.N. Krylov method is using to calculate the stability, whereas the seakeeping is analysed by strip theory. Both of the results for stability and seakeeping are calculated by Maxsurf Software. Stability and seakeeping analysis was carried out when the ship is in even keel condition, trim by bow, and trim by stern in maximum and extreme condition. The results shows that the trim by stern of the ship can increased the ship stability rate by 0.5~5.4%. While the effect of trim on ship motions varies due to the differences characteristics of each ship. The results shows due to the trim impact by values of RAO’s, which some of ship motions have increased meanwhile for some ship motion have decreased of ship motion condition.
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20

Ahmad, Mujahid Syaiful. "KAJIAN SEAKEEPING KAPAL FERRY RO-RO 750 GT BERBASIS PENGUJIAN HIDRODINAMIKA." ROTOR 11, no. 2 (November 1, 2018): 8. http://dx.doi.org/10.19184/rotor.v11i2.9336.

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The Ferry Ro-Ro is a ship that functions to crossing inter island and to transport vehicles, passengers and goods. Building a ship requires a very large investment value so that the design of the ship is a very important consideration by conduct the intens study to determine the performance of a ship, one of them is the performance of the ship motion, endurance, and reliability while sailing which can be seen by conducting a hydrodynamic test in the form of a seakeeping test on the Ferry Ro-Ro Ship Model. This study conduct the seakeeping testing due to Ferry Ro-Ro 750 GT Ship Model which aims to predict the pattern of ship behavior by using the seakeeping test methods at Manoeuvering and Ocean Basin at Laboratorium Hidrodinamika Indonesia at Balai Teknologi Hirdoinamika - BPPT with th parameter Wave Height Hs = 2.50 m, Wave Period Tp = 9.00 s by heading 180 deg and 135 deg, and model scale is 1 : 21.19. The seakeeping test procedure for the Ferry Ro-Ro 750 GT Ship Model is based on ITTC No 7.5-02-07-02 standards. Testing of the ship model is conducted by using the method of free running where ship moving at a speed of 12 knots (actual scale). Analysis of measurement results is displayed in the form of Response Amplitude Operator (RAO) and statical analysis. The hydrodynamic test results in the form of a seakeeping test of Ferry Ro-Ro 750 GT Ship Model shows the value of Root Mean Square (RMS) of each direction of the ship relative to the direction of arrival of the wave (heading) 180 deg with roll value = 0.825 deg and pitch value = 2.231 deg. And heading 135 deg with roll value = 2.410 deg and pitch value = 1.797 deg, where NORDFORSK 1987 criteria standard for RMS roll value is 6 deg, and RMS pitch value is 1.5 deg. Keywords: Seakeeping, Ferry Ro-Ro, Hydrodynamics
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21

Pechenyuk, A. "STUDY OF SEAKEEPING PERFORMANCE OF FISHING VESSELS WITH THE HELP OF CFD METHODS." Shipping & Navigation 33, no. 1 (December 1, 2022): 96–105. http://dx.doi.org/10.31653/2306-5761.33.2022.96-105.

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Seakeeping performance is quite important for certain ship types. Fishing vessels often operate in areas with frequent storms, and sometimes it is necessary to continue fishing despite the worsening sea state. The development of hull forms providing good seakeeping performance of fishing vessels is the problem of current interest in ship design. The conventional approach to seakeeping studies is testing models in ship model basins. However, it is time-consuming and expensive, especially when many hull form variants are studied. For this reason, computer calculations based on the theory of ship motions and strip theory were developed and introduced. Today the more advanced methods of computational fluid dynamics (CFD) can be applied to the problem. The study of ship motions with the help of Reynolds-averaged Navier-Stokes (RANS) CFD method is considered in this paper. A suggested numerical model implies the generation of waves through initial and boundary conditions, which express fully developed waves with preset parameters. An object of research is the seagoing trawler with an overall length of 44.6 m. Three versions of hull form are used in simulations. All versions have similar transom afterbodies, but different forebodies: one similar to Axe Bow, a bulbous bow and one similar to X-bow. Ship movement with headings 180° and 150° at speed of 3.5 knots was studied to reveal differences in added resistance and ship motions. While added resistance and characteristics of heaving and pitching have shown no clear advantages among the considered shapes of forebodies, the version similar to X-bow has demonstrated a significant decrease in rolling at heading 150°. The results of the study have shown that the suggested numerical setup in combination with the CFD methods described can be used for quite realistic simulations of ship behaviour in rough seas. Keywords: seakeeping simulations, seakeeping of fishing vessels, CFD for ship design, improved seakeeping performance, simulation of ship motions.
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22

Sclavounos, Paul D., and Yifeng Huang. "Rudder Winglets on Sailing Yachts." Marine Technology and SNAME News 34, no. 03 (July 1, 1997): 211–32. http://dx.doi.org/10.5957/mt1.1997.34.3.211.

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During the defender round robins of the 1995 America's Cup, the yacht Young America featured a pair of rudder winglets. Their raison d'etre was to improve the vessel rough water performance, and in particular reduce her added resistance in waves. This article presents the background analysis which leads to the conclusion that rudder winglets may improve appreciably the seakeeping performance of a sailing yacht. The seakeeping method used to study the rough water performance of America3 in 1992 and Young America in 1995 is reviewed along with the fluid dynamics governing the generation of thrust by oscillating wingswings. The effect of winglets upon the yacht seakeeping is considered, the mechanisms contributing to the reduction of the yacht added resistance are identified and the effect of rudder, bulb and bow winglets is studied.
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23

Kukner, Abdi, and Muhsin Aydm. "Influence of Design Parameters on Vertical Motions of Trawler Hull Forms in Head Seas." Marine Technology and SNAME News 34, no. 03 (July 1, 1997): 181–96. http://dx.doi.org/10.5957/mt1.1997.34.3.181.

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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.
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24

Sariöz, K., M. Atlar, E. Sariöz, M. D. Woodward, and R. Sampson. "Operability of fast podded RoPax vessels in rough seas." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 219, no. 1 (March 1, 2005): 37–46. http://dx.doi.org/10.1243/147509005x10477.

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Methods are described for the evaluation of the seakeeping performance of a fast RoPax vessel driven by podded propulsors in the North Sea environment. The evaluation procedure is based on the responses of the vessel in regular waves, the wave conditions encountered, and the limiting values associated with the vessel's mission. The seakeeping performance is represented by the average attainable speed (AAS), which is defined as the ratio of the average speed of the vessel on a specified route to the calm water speed. Both the natural (due to the added wave resistance) and the voluntary (due to the excessive ship responses) speed losses are taken into account. The annual average speed of the fast RoPax design in the North Sea is evaluated and compared with that of a similar size conventional RoPax vessel. The results indicate that, despite its 20 per cent smaller displacement, the fast RoPax design, in general, has better seakeeping performance characteristics than that of the conventional design. The effect of podded propulsors on the average annual speed is also investigated and it is found that the presence of podded propulsors can have favourable effects on the seakeeping performance characteristics, particularly on the vertical plane responses.
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25

Boroday, I., S. Zhivitsa, and V. Platonov. "Ship seakeeping and the ways of studying it (to the 50th anniversary of Seakeeping Laboratory)." Transactions of the Krylov State Research Centre 2, no. 384 (2018): 147–52. http://dx.doi.org/10.24937/2542-2324-2018-2-384-147-152.

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26

Begovic, Ermina, and Simone Mancini. "Stability and Seakeeping of Marine Vessels." Journal of Marine Science and Engineering 9, no. 2 (February 19, 2021): 222. http://dx.doi.org/10.3390/jmse9020222.

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27

Hutchison, Bruce L. "Cargo Mechanics (Application of Seakeeping--Revisited)." Marine Technology and SNAME News 23, no. 03 (July 1, 1986): 230–41. http://dx.doi.org/10.5957/mt1.1986.23.3.230.

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The basic concepts of modern risk and reliability theory are reviewed. Application of these concepts to topics arising in the analysis of ship motions, cargo sea-fastening design and voyage risk studies is explored. The role of risk analysis in decision theory is briefly discussed and the paper concludes with a suggested program of analysis for marine activities and enterprises subject to sea-action induced risk.
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28

Hutchison, Bruce L. "Principal Axes for Seakeeping Response Processes." Marine Technology and SNAME News 41, no. 04 (October 1, 2004): 183–99. http://dx.doi.org/10.5957/mt1.2004.41.4.183.

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This paper complements an earlier paper by the same author titled "Joint Seakeeping Response Processes for Determining Structural Loads," presented at the 2002 SNAME Annual Meeting. That paper put forward a variety of methods appropriate to the characterization of joint processes, including phase co-factors, cross cospectral moments, and joint normal techniques. The present paper exploits cross cospectral moments to determine principal axes for joint seakeeping processes and explores their behavior and properties in appropriate parameter spaces. The convergence of time domain realizations of these joint processes on the principal axes is also demonstrated through Fourier-Stieltjes simulations and conditional probabilities. One example application is to determine the orientation in space of principal axes for vector processes, such as translational accelerations in vessel coordinates. As shown by a referenced paper cited in the conclusions, the method can be extended to Von Mises stress and rainflow fatigue.
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29

Sellars, Frank. "Seakeeping Characteristics of a Drifting Vessel." Journal of Ship Research 30, no. 01 (March 1, 1986): 26–34. http://dx.doi.org/10.5957/jsr.1986.30.1.26.

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This paper describes investigation of the roll response of a ship drifting broadside to the waves. Results of experiments with a modified Mariner-type cargo ship model free to roll, sway, heave, and pitch showed broadside drift caused a 20 percent increase in resonant roll amplitude. Calculation results for roll in beam seas with broadside drift confirmed that an increase in resonant roll amplitude is expected. These results are different from previous model tests which showed a reduction in roll when drift occurred. These previous tests had sway restrained and the effect of model test sway restraint on roll has been considered herein. It is concluded that sway restraint has a significant effect on roll.
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30

Bilandi, Rasul Niazmand, Sasan Tavakoli, and Abbas Dashtimanesh. "Seakeeping of double-stepped planing hulls." Ocean Engineering 236 (September 2021): 109475. http://dx.doi.org/10.1016/j.oceaneng.2021.109475.

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31

Dyachkov, Vasilij, and Jurij Makov. "SEAKEEPING OF A FAST DISPLACEMENT CATAMARAN." TRANSPORT 20, no. 1 (February 28, 2005): 14–22. http://dx.doi.org/10.3846/16484142.2005.9637990.

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The paper presents a complex method for the calculation of pitch and heave of a fast displacement catamaran. It incorporates speed factors, interference of catamaran hulls, stabilization factors and possibility to apply different stabilization cases including a stabilizer activation possibility. In the method the possibility to evaluate catamaran motions in irregular waves is also included. On the base of the presented method the computer program is developed and applied to calculate seakeeping characteristics of a catamaran stabilized with a fore passive wing. The results of calculation are in good compatibility with the experimental model tests of this catamaran in irregular waves. The calculation method could be effectively applied in the design stage of fast displacement catamarans or of fin stabilizers determining their effectiveness.
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32

Maslov, V. "Freak wave simulation in Seakeeping Tank." TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE S-I, no. 2 (September 2, 2019): 91–98. http://dx.doi.org/10.24937/2542-2324-2019-2-s-i-91-98.

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33

Söding, Heinrich. "Second-Order Seakeeping Analyses using Perturbators." Ship Technology Research 61, no. 1 (January 2014): 4–15. http://dx.doi.org/10.1179/str.2014.61.1.001.

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34

GRAHAM, Ross, A. ERICH BATIS, and W. G. MEYERS. "ON THE DEVELOPMENT OF SEAKEEPING CRITERIA." Naval Engineers Journal 104, no. 4 (July 1992): 123–24. http://dx.doi.org/10.1111/j.1559-3584.1992.tb01168.x.

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35

GRAHAM, ROSS, A. ERICH BAITIS, and WILLIAM G. MEYERS. "On the Development of Seakeeping Criteria." Naval Engineers Journal 104, no. 3 (May 1992): 259–75. http://dx.doi.org/10.1111/j.1559-3584.1992.tb02245.x.

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36

Baree, M. S., and Laboni Afroz. "Seakeeping Performance of Series 60 Ships." Procedia Engineering 194 (2017): 189–96. http://dx.doi.org/10.1016/j.proeng.2017.08.134.

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37

Faulkner, D. "Seakeeping ship behaviour in rough weather." Marine Structures 2, no. 2 (January 1989): 174–76. http://dx.doi.org/10.1016/0951-8339(89)90012-9.

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38

Niklas, Karol, and Artur Karczewski. "Determination of Seakeeping Performance for a Case Study Vessel by the Strip Theory Method." Polish Maritime Research 27, no. 4 (December 1, 2020): 4–16. http://dx.doi.org/10.2478/pomr-2020-0061.

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Abstract The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the operational capacity and propulsion efficiency of the ship, as well as on comfort and safety of navigation. The article analyses selected aspects of seakeeping for four variants of a selected case study vessel, indicating practical limitations of the strip method. The analysed aspects included hull heaving and pitching, added resistance, Motion Thickness Indicator (MSI), and Subjective Magnitude (SM). Experimental tests were also performed in the towing tank. Their comparison with the numerical results has indicated high inaccuracy of the strip method. What is more, the simplified representation of hull shape used in the strip method makes it impossible to analyse the effect of hull shape changes on the predicted seakeeping characteristics. Especially for the case of head wave, neglecting highly non-linear phenomena, such as slamming or head wave breaking, in strip method-based computer simulations will significantly decrease the reliability of the obtained results. When using the strip method, the seakeeping analysis should be complemented with model tests in a towing tank, or by another more complex numerical analysis, such as CFD for instance.
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39

Waskito, Kurniawan Teguh, and Yanuar. "On the High-Performance Hydrodynamics Design of a Trimaran Fishing Vessel." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 83, no. 1 (June 3, 2021): 17–33. http://dx.doi.org/10.37934/arfmts.83.1.1733.

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Trimaran hull form as multihull ship becomes more attractive these days in various ship types. It offers more advantages in terms of seakeeping performances, particularly on the application of a fishing vessel. However, thus far, the conventional design of fishing vessels is not favorable to ensure the safety of a vessel sailing in a rough sea. In conjunction with such issues, we discuss a trimaran fishing vessel design based on the seakeeping criterion to evaluate the dynamic stability, ship motion RAOs, and ship resistances at the initial design stages using linear strip theory. The intact stabilities are calculated to complement the seakeeping results. The analytical method based on the slender body method is used to evaluate the steady wave resistances. The results of heave, pitch, roll motions, and the ship resistances are discussed. At the zero speed and forward speed, the trimaran shows a favorable motion amplitude, although in forward speeds at the case of head seas there is no significant difference. The trimaran presents a favorable steady-resistance up to the ship speed of Fn=0.27, and it becomes deteriorating than the monohull at higher ship speeds. However, the added wave resistances of the wavelength range 1.0 – 3.0 shows significant added resistances at Fn=0.25 and Fn=0.35, respectively. The results of this study present promising seakeeping and resistance characteristics of the trimaran hull form. The trimaran hull form ensures the safety, reliability, and operation efficiency of ships sailing in broader ranges of violent-sea environment.
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40

Zborowski, Andrew, and Simon R. Sainsbury. "Small Vessel Hull Form Optimization for Heave and Pitch Performance." Marine Technology and SNAME News 25, no. 04 (October 1, 1988): 293–303. http://dx.doi.org/10.5957/mt1.1988.25.4.293.

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The Ship Motion Program (SMP) originally written for a mainframe computer system has been adapted for use on the IBM PC microcomputer family and subsequently applied to study ship seakeeping performance. The converted program, referred to as the Ship Seakeeping Characteristics Program (SSCP), was utilized for a parametric study on the influence of the main form parameters on heave and pitch performance for the British Ship Research Association (BSRA) trawler series of geometrically related forms. From the results of this study an optimum form has been indicated and its geometrical features defined.
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41

Kring, D. C. "Ship Seakeeping Through the t = 1/4 Critical Frequency." Journal of Ship Research 42, no. 02 (June 1, 1998): 113–19. http://dx.doi.org/10.5957/jsr.1998.42.2.113.

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This study demonstrates that a bounded, physically relevant solution does exist at the so-called T = Uω/g = 1/4 resonance in the linear seakeeping problem for a realistic ship with forward speed, U, frequency of encounter, ω, and gravitational acceleration, g. The solution of the seakeeping problem by a linear, three dimensional, time-domain Rankine panel method, validated through numerical analysis, testing, and comparison to physical experiments, supports this claim. The solution can also be obtained with equal validity through frequencies both above and below the critical frequency.
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42

Chen, Shuling, Beilei Zou, Changzhi Han, and Shiqiang Yan. "Comparative Study on Added Resistance and Seakeeping Performance of X-Bow and Wave-Piercing Monohull in Regular Head Waves." Journal of Marine Science and Engineering 10, no. 6 (June 14, 2022): 813. http://dx.doi.org/10.3390/jmse10060813.

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Bow shape has been recognized as an important factor influencing the seakeeping performance and added resistance of ships. This paper presents a numerical comparative study on added resistance and seakeeping of model ships with ‘X-bow’ and a wave-piercing monohull in regular head waves using a computational fluid dynamics (CFD) software. Different wave heights, wavelengths and forward speeds are considered in the systematic investigation in order to characterize the added resistance and wave-induced motions, and to explore the local wave patterns. The results show a considerably different hydrodynamic characteristic by different bow shapes.
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43

Perijoc, Dumitru Silviu, and Leonard Domnișoru. "On the river barge of 3000 T preliminary seakeeping approach." Analele Universităţii "Dunărea de Jos" din Galaţi Fascicula XI Construcţii navale/ Annals of "Dunărea de Jos" of Galati Fascicle XI Shipbuilding 45 (December 3, 2022): 63–72. http://dx.doi.org/10.35219/annugalshipbuilding/2022.45.07.

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This study concerns the preliminary seakeeping analysis of a river barge of 3000 T with length of 90 m and two main loading conditions: full cargo and ballast. As environmental conditions the maximum wave heigh is 2 m, with whole range wave-barge heading angle, specific for all the river navigation zone. The maximum speed of the river barge is 15 km/h. The numerical analysis involves a linear seakeeping code by strip-theory method and short-term irregular waves approach, representing a preliminary simplified evalua-tion of the navigation capabilities of the river barge.
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44

Zalek, Steven F., Michael G. Parsons, and Robert F. Beck. "Naval Hull Form Multicriterion Hydrodynamic Optimization for the Conceptual Design Phase." Journal of Ship Research 53, no. 04 (December 1, 2009): 199–213. http://dx.doi.org/10.5957/jsr.2009.53.4.199.

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For a given set of ship design and operational criteria, there exists a trade-off between the ship's calm water powering performance and its seakeeping performance. Ship hulls that are designed for optimal powering performance can have poor seakeeping performance, and vice versa. It is typically not possible to obtain the global optimum for both of these objectives because of the competition between the powering and seakeeping performance functions and the design constraints. The set of globally nondominated solutions, or Pareto front, considering these competing criteria is searched for by navigating the multimodal search space using a multicriterion, population-based evolutionary algorithm optimization process. The optimization process uses a nontraditional objective function formulation that eliminates the need to tune the penalty function parameters for each new problem formulation and appears to provide a more thorough representation of the numerically approximated Pareto front. Results show that properly integrating this optimization process with the design criteria yields a set of hydrodynamically superior design solutions. The problem formulation and development is applicable to naval surface vessels and applied to a monohull frigate type example.
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45

Lin, Yu-Hsien, and Chia-Wei Lin. "Numerical Simulation of Seakeeping Performance on the Preliminary Design of a Semi-Planing Craft." Journal of Marine Science and Engineering 7, no. 7 (June 27, 2019): 199. http://dx.doi.org/10.3390/jmse7070199.

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This study established a seakeeping program to evaluate the motion responses of a high speed semi-planing craft and to develop a database for future route planning. A series 62 mono-hull was chosen for the test cases, comparing seakeeping performances with full-scale on-board measurements. The statistical results were obtained using spectral analysis, which combines the International Towing Tank Conference (ITTC) spectrum with the response amplitude operator (RAO) responses of each wave heading for a given sailing speed. The speed polar diagram was made to illustrate five degree-of-freedom (DOF) motion responses between sailing speeds and wave heading angles in a particular sea state. Although the craft has different trim angles at high speeds (because of dynamic lift) under various loading and draft conditions, this study only investigated the trim angles of 0° (even keel), 1° by the stern, and 2° by the stern, to understand the difference between their seakeeping performances. The results in this study provide a useful guideline for evaluating operational regulations and safety for high speed semi-planing crafts in the future.
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46

Ketut Suastika, Agung Silaen, Muhammad Hafiz Nurwahyu Aliffrananda, and Yuda Apri Hermawan. "Seakeeping Analysis of a Hydrofoil Supported Watercraft (Hysuwac): A Case Study." CFD Letters 13, no. 5 (June 3, 2021): 10–27. http://dx.doi.org/10.37934/cfdl.13.5.1027.

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Considering recent global temperature increase and observed climate change, efforts have been made towards energy efficiency and reduction of green-house gas emission. A foil system is proposed in this study and retrofitted to an existing catamaran to reduce the energy use and to improve the vessel’s seakeeping characteristics. The objective of this study is to investigate the effects of the application of the foil system on the seakeeping performance of the vessel. CFD simulations based on a panel method were carried out to obtain the seakeeping characteristics of the catamaran with and without foil system. Simulation results show that the foil system reduced the vessel motions in a seaway: the heave-, pitch- and roll significant amplitudes were reduced 4.41, 9.97 and 3.30 percent, respectively, due to the application of the foil system. In addition, the vertical accelerations at the fore perpendicular (FP) and at deck were reduced 3.66 and 9.70 percent, respectively. A check against the NORDFORSK criteria for fast small crafts shows that the vessel can operate safely up to sea state 2.
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47

Ma, Tian Yu, Song Lin Yang, Cen Hang, Qiang Yu, and Yi Yan Wen. "Model-Based Synthetical Optimization Analysis on Navigation Performance of Unmanned Surface Vehicle." Applied Mechanics and Materials 738-739 (March 2015): 260–66. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.260.

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Unmanned Surface Vehicle (USV) has very complex forces and states when sailing at sea. While the optimization of USV via regression equations usually has a lower precision. Rapidity and seakeeping tests have been conducted based on a USV model of JUST. The rapidity test is mainly ship model resistance test and the seakeeping tests include wave added resistance test, hydrostatic pitching test, pitching and heaving test under the wave. Response surfaces fitting vectors of rough water resistance, pitching significant value, heaving significant value is established while using VC++ language to write second-order response surface fitting programs after dimensionless conversion of test data. Mathematical model of USV navigation performance synthetical optimization is proposed, including systems of rapidity, maneuverability and seakeeping. A layered parallel genetic algorithm (L-P-GA) optimization program is written in VC++ language, which can optimize a variety of conditions with different design speed and displacements. The results indicate that the optimization method has a higher precision and it can provide an opportunity to optimize the navigation performance of USV effectively.
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48

Tuitman, J. T., and Š. Malenica. "Fully coupled seakeeping, slamming, and whipping calculations." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 223, no. 3 (June 19, 2009): 439–56. http://dx.doi.org/10.1243/14750902jeme153.

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This paper presents a methodology to solve the seakeeping, slamming, and whipping problems coupled within a single calculation. The coupled problem is solved within a partly non-linear time domain seakeeping program. The elastic modes used in this hydroelastic problem can be calculated using a beam model or full three-dimensional (3D) finite element model of the ship structure. The slamming loading is calculated by a two-dimensional (2D) method. The main focus of this paper is the creation of an accurate and consistent coupling between the 3D seakeeping program and the 2D slamming calculation. Differences in timescale and integration methods make this coupling complex. A large container ship is used to illustrate the application of the presented methodology. The contribution of the non-linearities and the whipping response to the expected maximum bending moment and fatigue damage of this ship for a full-wave scatter diagram is calculated. The results show that the slamming-induced whipping response has a significant contribution to both the ultimate bending moment and the fatigue loading of the ship.
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49

Im, Namkyun, and Sangmin Lee. "Effects of Forward Speed and Wave Height on the Seakeeping Performance of a Small Fishing Vessel." Journal of Marine Science and Engineering 10, no. 12 (December 7, 2022): 1936. http://dx.doi.org/10.3390/jmse10121936.

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The effects of wave height and forward speed on the seakeeping performance of a small fishing vessel in irregular waves are evaluated using computational fluid dynamics (CFD). The wave height effect changed linearly for a forward speed in the head sea and beam sea. In the stationary state, the heave and roll motions attributed to the wave height appear nonlinearly. The effect of the speed showed a non-linear shape wherein the heave motion became larger with an increase in the forward speed in beam sea. The seakeeping performance of pitch motion is greatly improved at forward speed rather than in a stationary state. The seakeeping performance of the roll motion is more dangerous than the pitch motion, regardless of wave height and vessel speed. The mean roll period in irregular waves is obtained through this study, and it is longer than the natural roll period in still water. It is necessary to be careful as the probability of exceeding the limit is high and GM is decreased in transverse waves.
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50

Grigoropoulos, Gregory J. "Hull Form Optimization for Hydrodynamic Performance." Marine Technology and SNAME News 41, no. 04 (October 1, 2004): 167–82. http://dx.doi.org/10.5957/mt1.2004.41.4.167.

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A method for optimizing hull forms with respect to their hydrodynamic performance in calm and rough water is presented. The method is based on an initial optimization of a parent hull form for seakeeping and the improvement of the resulting optimum hull form for calm water resistance. In the first part of the method, variant hull forms differing from a parent in the main dimensions and/or in one or more hull form parameters, such as CWP, LCF, CB, LCB, KB, CP, are automatically generated and their seakeeping qualities evaluated. When appropriate ranges for the principal characteristics and parameters of the hull form under investigation are prescribed, a formal optimization procedure is used to obtain the variant with the best seakeeping behavior. The weighted sum of the resonant values of selected ship responses for a number of ship speeds and headings in regular waves forms the objective function. The Hooke and Jeeves algorithm is used to accomplish the optimization. The procedure results in a set of trends regarding the proposed variations of the selected hull form parameters, within the specified constraints. These trends are then applied on the parent hull to derive an optimized hull form with fair lines. Subsequently, this hull form can be locally modified to improve its calm water resistance or, as it should be done, its propulsion characteristics. The applicability of the method is demonstrated in two cases: a conventional reefer ship and a naval destroyer. Scaled models of the parent and the optimized hull forms have been tested for calm water resistance and seakeeping. In both cases the validity of the methodology is demonstrated.
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