WORK ANALYSIS OF PLATE BENDING WORKSHOP IN SHIPBUILDING INDUSTRY

2021 ◽  
Vol 157 (A4) ◽  
Author(s):  
M Ozkok
Keyword(s):  
Simulation Model ◽  
Processing Time ◽  
Plate Bending ◽  
Shipbuilding Industry ◽  
Work Analysis ◽  
Work Shop

Plate bending is one of the major processes in shipbuilding. The plates which are cut in specific dimensions are sent to plate bending work shop and they are curved by using various methods. These curved plates constitute bilge turn plates of a vessel which are curvilinear. In this study, plate bending work shop was considered and its simulation model was created by using SIMIO software. The aim of the study is to see the effects of some alterations on available situation of plate bending work shop and present some recommendations in order for the plate bending work shop to operate effectively. In this work, there are number of four alterations including the changing of bending processing time, number of cranes and bending machine. At the end of the study, the values of the most suitable crane number, bending machine number, and the bending operation processing time were recommended. It is believed that the plate bending work shop will operate in effective way if the shipyard administration implement the recommendations presented in this study.

Work Analysis of Plate Bending Workshop in Shipbuilding Industry

2015 ◽  
Vol 157 (A4) ◽  
pp. 275-284
Keyword(s):  
Simulation Model ◽  
Processing Time ◽  
Plate Bending ◽  
Shipbuilding Industry ◽  
Work Analysis ◽  
Work Shop

Plate bending is one of the major processes in shipbuilding. The plates which are cut in specific dimensions are sent to plate bending work shop and they are curved by using various methods. These curved plates constitute bilge turn plates of a vessel which are curvilinear. In this study, plate bending work shop was considered and its simulation model was created by using SIMIO software. The aim of the study is to see the effects of some alterations on available situation of plate bending work shop and present some recommendations in order for the plate bending work shop to operate effectively. In this work, there are number of four alterations including the changing of bending processing time, number of cranes and bending machine. At the end of the study, the values of the most suitable crane number, bending machine number, and the bending operation processing time were recommended. It is believed that the plate bending work shop will operate in effective way if the shipyard administration implement the recommendations presented in this study.

ASSEMBLY LINE BALANCING IMPLEMENTATION IN MINOR AND SUB ASSEMBLY WORK SHOP AT SHIPYARDS

2021 ◽  
Vol 158 (A2) ◽  
Author(s):  
M Ozkok ◽  
M K Kasikci ◽  
I H Helvacioglu
Keyword(s):  
Assembly Line ◽  
Assembly Line Balancing ◽  
Line Balancing ◽  
Assembly Lines ◽  
Work Unit ◽  
Shipbuilding Industry ◽  
Work Shop ◽  
Manufacturing Techniques ◽  
Traditional Manufacturing ◽  
Line Design

Recently, the competitive environment is very tough in shipbuilding industry and under these circumstances, manufacturing a ship in a shorter time becomes significantly important in order to meet the customer demands. Therefore, it is hard to do that by using traditional manufacturing techniques. The shipyards located in Turkey usually have functional locations for the machines and this situation often causes longer production times. Instead of this, assembly lines should be redesigned as workshops in the shipyard. Prefabrication work unit is a good example in which an assembly line is needed to be designed. In this study, an assembly line design for prefabrication work unit was performed. For this, assignments of work operations to work shops were carried out by using Largest Set Rule Algorithm and some alternatives were created according to compare the different values of cycle time. These alternatives were simulated by using a production simulation program and the most appropriate assembly line design was presented.

scholarly journals A simulation model for comparison of an innovative hybrid system and the conventional cellular manufacturing

2021 ◽  
Author(s):  
Erika Valery Lopez Roa
Keyword(s):  
Simulation Model ◽  
Hybrid System ◽  
Processing Time ◽  
Job Shop ◽  
Cellular Manufacturing ◽  
Setup Time ◽  
Performance Measure ◽  
Cellular System ◽  
Mean Flowtime ◽  
New System

Cellular manufacturing has tested positive in significantly reducing material handling and setup time as compared to a job shop, but it falls behind job shop in terms of flexibility. In this thesis a new system is proposed that takes advantage of the flexibility of a job shop while it keeps the setup time at a reduced level. This new system is referred to as hybrid system. In this thesis the performance of the proposed hybrid system is compared to the conventional cellular manufacturing system. Both systems are evaluated within a cellular layout and utilize group sheduling rules DDSI (due date truncated shortest processing time) and MSSPT (minimum setup shortest processing time). A simulation model, with random due dates and quantities is developed and tested. Performance measures are mean flowtime, tardiness and earliness. Overall results indicate that, in terms of mean flowtime and tardiness, the hybrid system outperforms the cellular system when the MSSPT rule was applied, while the cellular system outperforms the hybrid system when the DDSI rule is implemented. With regard to the earliness performance measure, the cellular system shows in most cases better performance than the hybrid system, regardless of the scheduling rule used. Finally, the results indicate that the hybrid system performs better than the cellular system with respect to the number of parts produced.

scholarly journals A simulation model for comparison of an innovative hybrid system and the conventional cellular manufacturing

2021 ◽  
Author(s):  
Erika Valery Lopez Roa
Keyword(s):  
Simulation Model ◽  
Hybrid System ◽  
Processing Time ◽  
Job Shop ◽  
Cellular Manufacturing ◽  
Setup Time ◽  
Performance Measure ◽  
Cellular System ◽  
Mean Flowtime ◽  
New System

Cellular manufacturing has tested positive in significantly reducing material handling and setup time as compared to a job shop, but it falls behind job shop in terms of flexibility. In this thesis a new system is proposed that takes advantage of the flexibility of a job shop while it keeps the setup time at a reduced level. This new system is referred to as hybrid system. In this thesis the performance of the proposed hybrid system is compared to the conventional cellular manufacturing system. Both systems are evaluated within a cellular layout and utilize group sheduling rules DDSI (due date truncated shortest processing time) and MSSPT (minimum setup shortest processing time). A simulation model, with random due dates and quantities is developed and tested. Performance measures are mean flowtime, tardiness and earliness. Overall results indicate that, in terms of mean flowtime and tardiness, the hybrid system outperforms the cellular system when the MSSPT rule was applied, while the cellular system outperforms the hybrid system when the DDSI rule is implemented. With regard to the earliness performance measure, the cellular system shows in most cases better performance than the hybrid system, regardless of the scheduling rule used. Finally, the results indicate that the hybrid system performs better than the cellular system with respect to the number of parts produced.

Reduction of Ship Waiting Time at Port Container Terminal Through Enhancement of the Tug/Pilot Machine Operation

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
A. Shahpanah ◽  
A. Hashemi ◽  
G. Nouredin ◽  
S. M. Zahraee ◽  
S. A. Helmi
Keyword(s):  
Simulation Model ◽  
Model Validation ◽  
Waiting Time ◽  
Processing Time ◽  
Container Terminal ◽  
Real Data ◽  
Simulation Software ◽  
Shipping Industry ◽  
Transition Points

Port container terminal is one of the important transition points in the shipping industry. Competitiveness is an important factor for port container terminal with the increase in the number of port terminals globally. Vessel processing time port terminals is one of the important factors that influence the port terminal attractiveness. In addition, most port terminals tried to reduce ship waiting time with enhancement of their facilities. This paper focused on the ship waiting time at the berthing area of port container terminal, and tried to solve the queuing problem at ship tugging operation in order to reduce the average waiting time. The data was collected from a major port container terminal in Malaysia as a case study. The port terminal is modeled with Arena 13.5 simulation software and model validation was done based on real data which was taken from the case study. Different scenarios were then tested on the tugging operation at the port simulation model. The results show that after the implementation of these scenarios, the average ship waiting time at the berthing area decreased dramatically from 180 hours to 140 hours for each ship.

A new tool for rapid development of electron microscopy negatives and micrographs: Initial impressions of the MOHR/PRO-8 processor

1992 ◽  
Vol 50 (2) ◽  
pp. 972-973
Author(s):  
James C. Long
Keyword(s):  
Electron Microscopy ◽  
Processing Time ◽  
Rapid Development ◽  
Processing Times ◽  
Initial Impressions ◽  
Transport Method

Over the years, many techniques and products have been developed to reduce the amount of time spent in a darkroom processing electron microscopy negatives and micrographs. One of the latest tools, effective in this effort, is the Mohr/Pro-8 film and rc paper processor.At the time of writing, a unit has been recently installed in the photographic facilities of the Electron Microscopy Center at Texas A&M University. It is being evaluated for use with TEM sheet film, SEM sheet film, 35mm roll film (B&W), and rc paper.Originally designed for use in the phototypesetting industry, this processor has only recently been introduced to the field of electron microscopy.The unit is a tabletop model, approximately 1.5 × 1.5 × 2.0 ft, and uses a roller transport method of processing. It has an adjustable processing time of 2 to 6.5 minutes, dry-to-dry. The installed unit has an extended processing switch, enabling processing times of 8 to 14 minutes to be selected.

Novel simulation model for many-body multipole dispersion interactions

1998 ◽  
Vol 94 (3) ◽  
pp. 417-433 ◽  
Author(s):  
MARTIN VAN DER HOEF ◽  
PAUL MADDEN
Keyword(s):  
Simulation Model ◽  
Dispersion Interactions ◽  
Many Body
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