Optimization of Heave Motions for a Four Column Semi-Submersible Based on Genetic Algorithm

2018 ◽  
Author(s):  
Suji Zhu
Keyword(s):  
Genetic Algorithm ◽  
Global Optimization ◽  
Computer Aided Design ◽  
Transfer Functions ◽  
Parametric Modelling ◽  
Optimal Solutions ◽  
Global Optimization Algorithm ◽  
The Past ◽  
Computer Aided ◽  
Aided Design

Semi-submersible is designed with low heave motions compared with conventional ships by utilizing the cancelation effects between pontoons and columns. During the past years, continuous efforts have been devoted to reducing the heave amplitudes considering utilizing dry-tree system. Different concepts of semi-submersible have been proposed with favorable heave response. Deep draft semi-submersibles have been proved to be efficient in reducing the heave motions, and the damper structures under the pontoon may also reduce the heave responses significantly. Those concepts are beyond the conventional semi-submersible design, which may bring high costs for fabrication and installations. During computer-aided design and analysis, optimization algorithms are used to search for the optimal hull configuration. However, due to the restrictions of computer capacities, the global optimization algorithm, in some cases, have difficulties in finding out the optimal solutions without the aid from engineering experience. In this paper, the geometry of a ring-pontoon four-column semi-submersible is generated by parametric modelling. The heave transfer functions at center of gravity are calculated using WADAM. Genetic algorithm is used to find the most favorable heave responses. In the end, the parameters that influence the heave motions are summarized and discussed.

Designing Technique Transfer of Dan Kwian Pottery Products

2018 ◽  
Vol 766 ◽  
pp. 40-43
Author(s):  
Chon Yeenang ◽  
Onlamee Kamon In
Keyword(s):  
Computer Aided Design ◽  
Skin Color ◽  
Research Method ◽  
Development Pattern ◽  
Participatory Action ◽  
The Past ◽  
Area 7 ◽  
Computer Aided ◽  
Aided Design ◽  
Cart Model

The development of Dan Kwian pottery products is a research that uses participatory action research methodology and qualitative research method. By selecting a specific sampling in area 7, Dan Chai Community, Dan Kwian District, Muang, Nakhon Ratchasima Province, Thailand. The objective of this research three reasons: 1) the study form and evolution of Dan Kwian pottery products. 2) the development of Dan Kwian pottery products to form individually. 3) To study the satisfaction of entrepreneurs and consumers towards Dan Kwian pottery products. The research found that the model of Dan Kwian pottery products in the past to convey the wisdom of the grandparents emphasize the usefulness rather than beauty. At present, the style of Dan Kwien pottery products has been designed in a popular fashion and computer aided design. The pottery have a variety of uses and beauty than in the past. The Dan kwian pottery product was development pattern to form a new identity. The five models was selected: two cat models, one peacock model, one owl model and one cart model to from fifty models. The researcher was introduced five new pottery products to assess the satisfaction of four entrepreneurs and thirty consumers. It was found that the pattern of the pottery is unique has average of entrepreneurs was 4.75, while the consumer has average of 4.13. The uniqueness of skin color has average of entrepreneurs was 4.75, while the consumer has average of 4.00. The beauty of the new pottery has average of entrepreneurs was 5.00, while the consumer has average 4.27. The useful for function of the pottery has average of entrepreneurs was 5.00, while the consumer has average of 4.70.

Computer-aided design of molecular machines: Techniques, paradigms and difficulties

2021 ◽  
Author(s):  
Haohao Fu ◽  
Xueguang Shao ◽  
Wensheng Cai
Keyword(s):  
Computer Aided Design ◽  
Molecular Machines ◽  
The Past ◽  
Wide Range ◽  
Computer Aided ◽  
Aided Design

With the development in the past decade, molecular machines, which achieve specific tasks by responsing to external stilmuli, are gradually regarded as powerful tools for a wide range of applications,...

scholarly journals Possibilities of applying structural optimization in building structures computer-aided design systems

2018 ◽  
Vol 251 ◽  
pp. 03017 ◽  
Author(s):  
Andrey Vasilkin
Keyword(s):  
Genetic Algorithm ◽  
Structural Optimization ◽  
Computer Aided Design ◽  
Optimization Method ◽  
Design System ◽  
Building Structures ◽  
Computational Tool ◽  
Computer Aided ◽  
Design Solutions ◽  
Aided Design

For computer-aided design solutions search, a computational tool, which will substantially facilitate designer’s work, has been developed. Structural optimization method – genetic algorithm method is taken as a basis. To accelerate design solutions synthesis, computer-aided design system in the form of a developed computational tool is used. It automatically synthesizes a significant number of design solutions using formalized conditions of strength facility requirements. Then, user compares the solutions upon performance criterion and selects the best options. The article demonstrates possibility of genetic algorithm application for obtaining design solutions through the example of a structural coating plate. The advantage of this method is obviousness in solutions search, visualization of proposed structures and user’s work with the system in dialog mode.

scholarly journals Numerical Analysis of Semi-Tangential Ogive Bullet

2021 ◽  
Vol 9 (8) ◽  
pp. 1869-1883
Author(s):  
Avinash T
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Analysis ◽  
Computer Aided Design ◽  
Steady Increase ◽  
The Past ◽  
Computer Aided ◽  
Parametric Studies ◽  
Computational Fluid Dynamics Cfd ◽  
Aided Design

Abstract: The objective of the present study is to design and analyze semi-tangential ogive bullets using simulatation software such as Computer-aided design & Computational Fluid Dynamics (CFD). It is observed that been a quite steady increase in the bullet research design in the past few decades. The nose section of ballistic bullet is the most important part of the design process. Hence design optimizations are achieved by adjusting the bullet's form to improve precision and stability by reducing its drag force. CFD is the study used to verify the findings. Since provides most accurate results. It is observed that present study optimizes the behavior of the at M= 2.5. This present work shows the flow of air around the bullet surface providing pressure & velocity contours at every segment. The Various parametric studies over bullet model are drag co-efficient, ballistic coefficient and turbulence viscosity are plotted’.

Parametric Modelling of a Knee Joint Prosthesis

1993 ◽  
Vol 207 (2) ◽  
pp. 115-120 ◽  
Author(s):  
L P Khoo ◽  
J C H Goh ◽  
S L Chow
Keyword(s):  
Knee Joint ◽  
Computer Aided Design ◽  
Parametric Model ◽  
Parametric Models ◽  
Design System ◽  
Parametric Modelling ◽  
Joint Prosthesis ◽  
Engineering Technique ◽  
Computer Aided ◽  
Aided Design

This paper presents an approach for the establishment of a parametric model of knee joint prosthesis. Four different sizes of a commercial prosthesis are used as an example in the study. A reverse engineering technique was employed to reconstruct the prosthesis on CATIA, a CAD (computer aided design) system. Parametric models were established as a result of the analysis. Using the parametric model established and the knee data obtained from a clinical study on 21 pairs of cadaveric Asian knees, the development of a prototype prosthesis that suits a patient with a very small knee joint is presented. However, it was found that modification to certain parameters may be inevitable due to the uniqueness of the Asian knee. An avenue for rapid modelling and eventually economical production of a customized knee joint prosthesis for patients is proposed and discussed.

scholarly journals The Power of the Past

2009 ◽  
Vol 131 (09) ◽  
pp. 26-31
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
San Diego ◽  
Hudson River ◽  
Original Model ◽  
The Past ◽  
Computer Aided ◽  
Design Software ◽  
Will Power ◽  
Color Scheme ◽  
Aided Design

This article discusses how some young engineers, fabricators, machinists, artists, and plumbers are helping revive old steam engines for art and archaeology's sake. The volunteers at Kinetic Steam Works labor to recondition steam engines that will power kinetic artistic installations. Since its inception, the collective has restored a steamship and sent it down the Hudson River as part of an artistic excursion. It has created and demonstrated a Baker fan—originally used to test the horsepower that a steam engine generated. Similarly, William Gould, a design consultant in San Diego is also trying to revive old steam engines. With help from original blueprints and SolidWorks computer-aided design software, he has detailed an 1879 Mason Bogie locomotive to discover exactly how it operated, something historians could not quite determine. Photoshop software allowed him to exactly match the train's color scheme based on a few paint chips from an original model.

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