scholarly journals Optimization of a warehouse layout used for storage of materials used in ship construction and repair

2012 ◽  
Vol 5 (10) ◽  
pp. 59 ◽  
Author(s):  
Wilson Adarme Jaimes ◽  
María A Otero Pineda ◽  
Tania A Rodríguez Quiñones ◽  
Lien Tejeda López
Keyword(s):  
Optimal Design ◽  
Ship Construction ◽  
Improve Efficiency ◽  
Simulation Techniques ◽  
Optimization And Simulation ◽  
Materials Used ◽  
Physical Layout ◽  
Shortage Costs

The paper shows the evaluation of applying models to improve efficiency in management of warehousesused in shipyards, focused on pick up, packing, and shipping activities, supported among others on theproposal by Rosenblatt and Roll (1984) to optimize the layout for storage and handling of materials neededfor ship construction and repair. Besides proposing the best physical layout for the storage of goods, themodel seeks to minimize three types of costs: costs related to the initial investment (construction andmaintenance), shortage costs, and costs associated with storage policies. The optimal design is foundthrough analytical optimization and simulation techniques.

Injection Strategies, Optimization and Simulation Techniques on DI CNG Technology

2015 ◽  
Author(s):  
Sukrut S Thipse ◽  
Shailesh B Sonawane ◽  
Ashwin F D' Souza ◽  
S D Rairikar ◽  
Kishor Kumar Kavathekar ◽  
...  
Keyword(s):  
Simulation Techniques ◽  
Optimization And Simulation ◽  
Injection Strategies

Dimensionless Solution to the Optimal Design of Spur Gear Sets

1989 ◽  
Vol 111 (2) ◽  
pp. 290-296 ◽  
Author(s):  
R. K. Carroll ◽  
G. E. Johnson
Keyword(s):  
Optimal Design ◽  
Material Properties ◽  
Design Space ◽  
Problem Formulation ◽  
Stress Constraints ◽  
Spur Gear ◽  
Minimum Size ◽  
New Approach ◽  
Materials Used ◽  
Standard Sets

In some earlier papers (Savage, Coy, and Townsend, 1982; Carroll and Johnson, 1984), the design of spur gear sets based on minimum size has been addressed considering the interaction of bending and contact stress constraints. In this paper, we present a new approach to the spur gear problem. The new method makes use of some newly defined dimensionless parameters. In the resulting design space, the optimal dimensionless design (which defines the optimal tooth geometry) is independent of load and speed requirements of the gear set. However the optimum is dependent on the physical properties of the materials used. We introduce a new quantity called the Material Properties Relationship Factor, CMP. In the problem formulation presented here, we show that the optimum will always be constraint bound and it will occur at one of three possible constraint intersections. CMP is used to identify which of three possible constraint intersections is the correct one. After the dimensionless optimum is found, we present an example which shows how to transform the solution back into the real design space considering the load and speed requirements of the gear set along with discrete value constraints on the number of teeth and the diametral pitch. Tabulated optimal dimensionless designs are included for some standard sets of tooth proportions.

Optimal Design of Composite Laminate With Uncertainty in Loading and Material Properties Considered

2005 ◽  
Author(s):  
Tae-Uk Kim ◽  
In Hee Hwang ◽  
Hyo-Chol Sin
Keyword(s):  
Optimal Design ◽  
Material Properties ◽  
Composite Laminates ◽  
Buckling Load ◽  
Optimization Approach ◽  
Stacking Sequence ◽  
Simulation Techniques ◽  
Aspect Ratios ◽  
The One ◽  
Efficiency And Reliability

Optimal design of composite laminates with uncertain in-plane loadings and material properties is considered. The stacking sequence is designed to have maximum buckling load based on anti-optimization approach. To consider the above-mentioned uncertain properties, the convex modeling and Monte Carlo simulation techniques are used in calculating objective function. For the stacking sequence optimization, it is used the modified genetic algorithm which handles the discrete ply angles and the constraints easily. Numerical results are given for rectangular laminates of various aspect ratios. The optimal solutions from the deterministic and the stochastic cases are obtained and it is demonstrated the importance of considering uncertainty. The buckling load carried by a deterministic design is much less than the one carried by a design uncertainty considered when both are subjected to uncertain loads. Also, it is examined the effects of the method for considering uncertainty on the optimization process in the light of computational efficiency and reliability of solutions obtained.

Optimal Design of Generalized Batch-Storage Network Considering Shortage Costs

AIChE Journal ◽  
2013 ◽  
Vol 59 (7) ◽  
pp. 2454-2470 ◽  
Author(s):  
Gyeongbeom Yi ◽  
Gintaras V. Reklaitis
Keyword(s):  
Optimal Design ◽  
Storage Network ◽  
Shortage Costs

scholarly journals Effect of water temperature on the hydrolysis of two absorbable sutures used in fish surgery

FACETS ◽  
2017 ◽  
Vol 1 (1) ◽  
pp. 44-54 ◽  
Author(s):  
Sarah A. Cannizzo ◽  
Simon C. Roe ◽  
Craig A. Harms ◽  
Michael K. Stoskopf
Keyword(s):  
Tensile Strength ◽  
Optimal Design ◽  
Water Temperature ◽  
Tensile Load ◽  
Suture Materials ◽  
Ambient Temperatures ◽  
Absorbable Sutures ◽  
Human Body Temperature ◽  
City Water ◽  
Materials Used

Persistence of absorbable sutures in fishes in waters below 10 °C affects surgical decisions including approach, closure strategy, and suture selection. We hypothesized that the rate of suture hydrolysis would vary directly with water temperature. Two absorbable monofilament 3-0 suture materials used in fish surgery, poliglecaprone (Monocryl™) and polyglyconate (Maxon™), were evaluated. The maximum tensile load (strength) was measured for suture loops ( n = 6) maintained in filtered city water for 2, 4, 6, or 8 weeks at 4, 25, or 37 °C. For Maxon™ at 4 or 25 °C, tensile strength did not decrease over time. However, for Monocryl™ at 4 °C, 2-, 4-, and 8-week loops were stronger than baseline loops. At 25 °C, tensile strength of the suture material declined after 2 weeks. Also, at 37 °C, the optimal design temperature for both suture materials, the strength of Maxon™ decreased at 6 and 8 weeks. Two 4-week loops of Monocryl™ disintegrated when handled, and after 6 and 8 weeks, all were untestable. This study confirms that absorbable sutures lose strength more slowly at ambient temperatures lower than the optimal design temperature (e.g., human body temperature) and will likely be retained longer in fishes living in waters below 25 °C.

scholarly journals Cross-Docking: A Systematic Literature Review

2020 ◽  
Vol 12 (11) ◽  
pp. 4789 ◽  
Author(s):  
Reza Kiani Mavi ◽  
Mark Goh ◽  
Neda Kiani Mavi ◽  
Ferry Jie ◽  
Kerry Brown ◽  
...  
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Major Research ◽  
Research Focus ◽  
Research Areas ◽  
Simulation Techniques ◽  
Cross Docking ◽  
Research Themes ◽  
Optimization And Simulation ◽  
Warehousing And Distribution

This paper identifies the major research concepts, techniques, and models covered in the cross-docking literature. A systematic literature review is conducted using the BibExcel bibliometric analysis and Gephi network analysis tools. A research focus parallelship network (RFPN) analysis and keyword co-occurrence network (KCON) analysis are used to identify the primary research themes. The RFPN results suggest that vehicle routing, inventory control, scheduling, warehousing, and distribution are most studied. Of the optimization and simulation techniques applied in cross-docking, linear and integer programming has received much attention. The paper informs researchers interested in investigating cross-docking through an integrated perspective of the research gaps in this domain. This paper systematically reviews the literature on cross-docking, identifies the major research areas, and provides a survey of the techniques and models adopted by researchers in the areas related to cross-docking.

2115 A Knowledge-Based Approach to Improve Efficiency of Optimal Design

2009 ◽  
Vol 2009.22 (0) ◽  
pp. 410-411
Author(s):  
Takao Muromaki ◽  
Kazuyuki Hanahara ◽  
Takuma Nishimura ◽  
Yukio Tada
Keyword(s):  
Optimal Design ◽  
Improve Efficiency ◽  
Knowledge Based

scholarly journals Conformation and Dynamics of Long-Chain End-Tethered Polymers in Microchannels

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 488 ◽  
Author(s):  
Tamal Roy ◽  
Kai Szuttor ◽  
Jens Smiatek ◽  
Christian Holm ◽  
Steffen Hardt
Keyword(s):  
Single Molecule ◽  
Oil Recovery ◽  
Deoxyribonucleic Acid ◽  
Dynamics Simulation ◽  
Relaxation Dynamics ◽  
Simulation Techniques ◽  
Simulation Based ◽  
Tethered Polymers ◽  
Materials Used ◽  
External Forces

Polyelectrolytes constitute an important group of materials, used for such different purposes as the stabilization of emulsions and suspensions or oil recovery. They are also studied and utilized in the field of microfluidics. With respect to the latter, a part of the interest in polyelectrolytes inside microchannels stems from genetic analysis, considering that deoxyribonucleic acid (DNA) molecules are polyelectrolytes. This review summarizes the single-molecule experimental and molecular dynamics simulation-based studies of end-tethered polyelectrolytes, especially addressing their relaxation dynamics and deformation characteristics under various external forces in micro-confined environments. In most of these studies, DNA is considered as a model polyelectrolyte. Apart from summarizing the results obtained in that area, the most important experimental and simulation techniques are explained.

Optimal Design and Preparation of Novel Radiation Shielding Materials Used for Low Energy γ/X-Ray

2014 ◽  
Vol 900 ◽  
pp. 209-212
Author(s):  
Bo Sheng ◽  
Shu Quan Chang ◽  
Bin Kang ◽  
Hong Xu Zhang ◽  
Yao Dong Dai
Keyword(s):  
Optimal Design ◽  
Epoxy Composite ◽  
Radiation Shielding ◽  
Low Energy ◽  
Epoxy Composites ◽  
Absorption Region ◽  
X Ray ◽  
Edge Absorption ◽  
Materials Used ◽  
Shielding Composites

The radiation shielding abilities of functional particles (Sm2O3, Er2O3, WO3and Bi2O3) were simulated and proved to have a stronger absorption region and a weaker absorption region respectively. Four kinds of functional particles/epoxy radiation shielding composites used for low energy γ/Xray were designed based on the edge absorption and synergistic absorption. By optimizing the proportion of functional particles in epoxy composites, the radiation shielding abilities bad been further improved. According to the results of optimal design, a kind of Sm2O3/Er2O3/WO3/Bi2O3/Epoxy composite was prepared and proved to be very efficient to shield low energy γ/X radiation.

scholarly journals The Exploitation Problems Marine Light Constructions for Corrosion Resistance / Problemy Eksploatacyjne Lekkich Konstrukcji Morskich w Aspekcie Odporności Korozyjnej

2015 ◽  
Vol 33 (1) ◽  
pp. 5-18
Author(s):  
Wojciech Jurczak
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Environmental Conditions ◽  
Construction Materials ◽  
Natural Phenomenon ◽  
Marine Structures ◽  
Ship Construction ◽  
Properties Of Materials ◽  
Materials Used

Abstract Corrosive degradation of construction materials for marine structures is a natural phenomenon. The extent of deterioration in mechanical properties of materials used in ship construction is directly linked to the chemical makeup of the material as well as the prevailing environmental conditions (e.g. salinity, physical stress) an the applied anti-corrosive coating. The paper presents results of research into stress corrosion of highly durable aluminum alloys. In order to increase the safety while using the above mentioned components, logging of corrosive potential has been introduced in the case of selected (corrosion-prone) number of surfaces of the quarter-section in relation the model 620 ship, made of 7020 alloy, so that the hazard of corrosive breach can be monitored.

Sign in / Sign up

Export Citation Format

Share Document