ROLLING OF TROLLING LINER ON SINJAI REGENCY

2017 ◽  
Vol 7 (2) ◽  
pp. 159 ◽  
Author(s):  
Aulia Azhar Wahab ◽  
St. Aisjah Farhum ◽  
Faisal Amir
Keyword(s):  
Good Stability ◽  
Rolling Motion ◽  
High Wave ◽  
Beam Seas

Trolling liner was a dominance used by fishermans in Sinjai Regency was made by traditional without planning before, so stability and seakeeping ability about sea condition was unknown. The research aimed to analyze the rolling motion of trolling liner in regular condition of beam seas. The research was a case study of trolling liner used by the fisherman in Sinjai.Geometry measurement vessel formwas done to get a model of trolling liner and then make a redesign as a comparedand thenmake a simulation using program Maxsurf v8.i.the result showed that the sample have a good stability. Higher rollingwas 18,168 onhigh wave -0,1971 m and lowerrollingwas -18,168 on high wave 0,1971 m,while theredesignshowed higherrollingwas 14,102 on high wave -0,1970 m and lowerrollingwas -14,102 on high wave 0.1968 m.

scholarly journals Using Length of Bilge Keel to Length of Waterline Ratio to Reduce Ship Rolling Motion

2018 ◽  
Vol 8 (2) ◽  
pp. 2731-2734
Author(s):  
P. K. D. N. Y. Putra ◽  
B. H. Iskandar ◽  
Y. Novita
Keyword(s):  
Good Stability ◽  
Length Ratio ◽  
Rolling Motion ◽  
Fishing Vessels ◽  
Bilge Keel ◽  
Minimum Ratio ◽  
Ship Rolling

Fishing vessels must have good stability and manoeuvrability. Hull with round bottom shape has a relatively poor rolling duration compared to other forms. Rolling duration reduction will improve the quality of stability of the ship which can be obtained with bilge keel installation. The objectives of this research are 1) to compare each parameter value on model ship by using bilge keel and 2) to determine the minimum ratio of bilge keel's length toward waterline length on the model ship which still has the ability to reduce rolling motion on the ship. The method used was giving treatment to model ship and observing its rolling motion with different lengths of bilge keel. Based on the result of the research, it can be concluded that bilge keel installation with some length ratio toward length of waterline has different results significantly, and bilge keel with length ratio 0.2 still have effective capability in reducing the rolling motion of the model ship.

scholarly journals Chaos analysis of ship rolling motion in stochastic beam seas

2017 ◽  
Vol 19 (8) ◽  
pp. 6403-6412 ◽  
Author(s):  
Shenghong Li ◽  
Kangkang Wang
Keyword(s):  
Rolling Motion ◽  
Chaos Analysis ◽  
Beam Seas ◽  
Ship Rolling

scholarly journals RATIO OF THE MAIN DIMENSIONS AND STATIC STABILITY TRADITIONAL PURSE SEINER IN PINRANG

2017 ◽  
Vol 9 (1) ◽  
pp. 19
Author(s):  
Muh. Arkam Azis ◽  
Budhi Hascaryo Iskandar ◽  
Yopi Novita
Keyword(s):  
Numerical Simulation ◽  
Static Stability ◽  
Good Stability ◽  
Purse Seine ◽  
Fishing Ground ◽  
Fishing Gear ◽  
Fishing Vessel ◽  
Main Dimension ◽  
Dimension Ratio

<p><em>The fishing vessel is the main vehicle of the fishermen to go to fishing ground and hauling purse seine especially fishing gear. Pinrang Regency ships traditionally built without calculation of naval architecture. Where the purse seine fishing gear in Pinrang Regency has length 330 m nets with a depth of 36 m. The purpose of this research was to examine the main dimension ratio in particular design and static stability of the vessel purse seine in Pinrang Regency. Method of using a case study on two types of vessels have different relative and analyzed by numerical simulation, calculate the ratio of the main dimensions and static stability. The results of this research are the vessels in Pinrang kasko model has the shape of a round bottom and slim body as well as the ratio of the dimensions of the vessels only L/D purse seine LOA 24 m more than the standard reference of vessels (encircling) in Indonesia and on the value of the static stability by the IMO, with a purse seine vessel Pinrang already has a good stability. However, in both types of vessel purse seine size 20 m that has better stability.</em></p><p><em> </em></p><strong><em>Keywords:</em></strong><em> design, fishing vessel, purse seine, stability</em>

A Computationally Efficient Implementation of Nonzero-Speed Transient Green Functions for Zero-Speed Nonlinear Seakeeping Problems

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
G. D. Gkikas ◽  
F. van Walree
Keyword(s):  
Drift Velocity ◽  
Model Tests ◽  
Green Functions ◽  
Strong Wind ◽  
Computationally Efficient ◽  
Drift Estimation ◽  
Beam Seas ◽  
The Common ◽  
The One

The proposed methodology is a time-domain panel method where the transient Green functions (GFs) used for the estimation and implementation of the free-surface effects on the vessel's motions are estimated assuming constant low lateral speed, instead of the common practice zero-speed influence functions. The main difference between the proposed method and standard practice lies in the use of the proposed scheme on a typical zero-speed problem, as the solution scheme is conditioned to the mean drift velocity instead of zero-speed. Furthermore, in this way, a significant improvement in accuracy accompanied by a large reduction in computational times is also achieved. The low lateral-speed GFs are computed for a speed similar to the one that the vessel is expected to drift. Estimation of this speed can be initially based on model tests or by means of an iterative process where we start the computations with the zero-speed GFs and adjust the latter's input speed according to the calculated drift speed until convergence is obtained. As a representative case study, we apply this method for the simulation of seakeeping behavior of a cruise ship in extreme dead ship conditions. For the validation of the proposed methodology, the first- and second-order motions, i.e., heave, roll, and the drift velocity, respectively, as well as lateral accelerations of the vessel were investigated for two cases of severe beam seas further combined with a constant strong wind load. The results were compared against experimental model tests.

RATIO OF THE MAIN DIMENSIONS AND STATIC STABILITY TRADITIONAL PURSE SEINER IN PINRANG

2017 ◽  
Vol 9 (1) ◽  
pp. 19-28
Author(s):  
Muh. Arkam Azis ◽  
Budhi Hascaryo Iskandar ◽  
Yopi Novita
Keyword(s):  
Numerical Simulation ◽  
Static Stability ◽  
Good Stability ◽  
Purse Seine ◽  
Fishing Ground ◽  
Fishing Gear ◽  
Fishing Vessel ◽  
Main Dimension ◽  
Dimension Ratio

The fishing vessel is the main vehicle of the fishermen to go to fishing ground and hauling purse seine especially fishing gear. Pinrang Regency ships traditionally built without calculation of naval architecture. Where the purse seine fishing gear in Pinrang Regency has length 330 m nets with a depth of 36 m. The purpose of this research was to examine the main dimension ratio in particular design and static stability of the vessel purse seine in Pinrang Regency. Method of using a case study on two types of vessels have different relative and analyzed by numerical simulation, calculate the ratio of the main dimensions and static stability. The results of this research are the vessels in Pinrang kasko model has the shape of a round bottom and slim body as well as the ratio of the dimensions of the vessels only L/D purse seine LOA 24 m more than the standard reference of vessels (encircling) in Indonesia and on the value of the static stability by the IMO, with a purse seine vessel Pinrang already has a good stability. However, in both types of vessel purse seine size 20 m that has better stability. Keywords: design, fishing vessel, purse seine, stability

scholarly journals Study for the Safety of Ships' Nonlinear Rolling Motion in Beam Seas

2009 ◽  
Vol 33 (9) ◽  
pp. 629-634 ◽  
Author(s):  
Zhan-Jun Long ◽  
Seung-Keon Lee ◽  
Jae-Hun Jeong ◽  
Sung-Jong Lee
Keyword(s):  
Rolling Motion ◽  
Beam Seas ◽  
Nonlinear Rolling
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