A Knowledge-Based Approach to Preliminary Design of Structures

1990 ◽  
Vol 112 (4) ◽  
pp. 213-219 ◽  
Author(s):  
J. Fleming ◽  
E. Elghadamsi ◽  
M. Tanik
Keyword(s):  
Design Tool ◽  
Design Stage ◽  
Preliminary Design ◽  
Knowledge Based ◽  
Preliminary Design Stage ◽  
Design Loads ◽  
Computer Based ◽  
And Performance ◽  
Optimum Solution ◽  
Use Of Knowledge

Computers have been used extensively for the analysis, detailed design and drawing production of structures. However, they have not been utilized effectively in the preliminary design stage. During this stage, the structural framing schemes that are likely to offer an optimum solution for the given design constraints are identified. Once an appropriate framing scheme is selected, an analytical model which requires initial member sizes is developed to investigate the behavior and performance of the structure under the design loads. An engineer may have to perform an approximate analysis to select the preliminary member sizes; however, experienced engineers may be able to make a reasonable estimate of the required sizes using their past experience with similar structures. A prototype computer-based design tool that utilizes past engineering experience for selecting initial member sizes of structures has been developed and is described in this paper. This tool is applicable to the design of various types of structures through the use of knowledge base techniques.

Standard Outfit Package Units in the LPD 17 Ship Design: A Production Impact Study

1995 ◽  
Vol 11 (04) ◽  
pp. 252-263
Author(s):  
Walter L. Christensen ◽  
Philip C. Koenig
Keyword(s):  
Production Scheduling ◽  
Ship Design ◽  
Design Stage ◽  
Traditional Practices ◽  
Preliminary Design ◽  
Wide Range ◽  
Preliminary Design Stage ◽  
And Performance ◽  
Assessment Problems ◽  
Material Ordering

Standard outfit package units for reverse osmosis plants, fire pumps, steering gear, and sanitary spaces were proposed for the LPD 17 amphibious transport dock ship design. The ship was in the preliminary design stage, and it was necessary to determine how this shift to outfit modularity would affect the ship procurement program. Because the use of package units would not have a significant impact on the overall characteristics and performance of the ship, the focus of the investigation was on material ordering and production scheduling. The analysis took account of zone-area-stage outfitting methods and also more traditional practices. With either approach, it was found that the package units did not present any schedule or procurement problems This particular study was focused on a very specific issue, but the approach is applicable to a wide range of production impact assessment problems.

Wave-Making Resistance of a Catamaran Hull in Shallow Water Using a Potential-Based Panel Method

2008 ◽  
Vol 52 (01) ◽  
pp. 16-29
Author(s):  
Md. Shahjada Tarafder ◽  
Kazuo Suzuki
Keyword(s):  
Water Depth ◽  
Design Tool ◽  
Design Stage ◽  
Hydrodynamic Characteristics ◽  
Preliminary Design ◽  
Interference Effects ◽  
Kutta Condition ◽  
Wave Interference ◽  
Preliminary Design Stage ◽  
Interior Flow

The aim of this paper is to investigate the influence of the water depth and the wave interference effects on the first- and second-order wave-making resistance of a catamaran hull using a potential-based boundary element method. Since the interior flow of each monohull of a catamaran is different from the exterior flow, both monohulls must be considered as lifting bodies. The pressure Kutta condition is imposed at the trailing edge of the lifting body to determine the dipole distribution, which generates required circulation on the lifting part. The effects of hull separation and water depth on the hydrodynamic characteristics of a catamaran hull are analyzed and the validity of the computer scheme is examined by comparing the wave resistance with others' numerical results. The present method could be a useful design tool for screening the suitable combinations of hull parameters and hull spacing at the preliminary design stage of a catamaran hull.

scholarly journals Uniform deformation design of outrigger braced skyscrapers: A simplified method for the preliminary design stage

Structures ◽  
2021 ◽  
Vol 31 ◽  
pp. 395-405
Author(s):  
Arsalan Alavi ◽  
Elena Mele ◽  
Reza Rahgozar ◽  
Ehsan Noroozinejad Farsangi ◽  
Izuru Takewaki ◽  
...  
Keyword(s):  
Design Stage ◽  
Preliminary Design ◽  
Uniform Deformation ◽  
Simplified Method ◽  
Preliminary Design Stage

An Approximate Method for Intact Stability of Fishing Vessels

1999 ◽  
Vol 36 (03) ◽  
pp. 171-174
Author(s):  
Hüseyin Yilmaz ◽  
Abdi Kükner
Keyword(s):  
Design Stage ◽  
Design Parameters ◽  
Preliminary Design ◽  
Ship Stability ◽  
Fishing Vessels ◽  
Initial Stability ◽  
Intact Stability ◽  
Preliminary Design Stage ◽  
Reduce Risk ◽  
Vessel Stability

It is well known that stability is the most important safety requirement for ships. One should have some information on ship stability at the preliminary design stage in order to reduce risk. Initial stability of ships is an important criterion and can be closely evaluated in terms of form parameters and vertical center of gravity. In this study, using some sample ship data, approximate formulations are derived by means of regression analysis for the calculations expressed in terms of ship preliminary design parameters that can easily provide approximate GM calculations. Thus designers can be provided with ship stability at the preliminary design stage, and also a set of appropriate design parameters for improving vessel stability can easily be determined.

scholarly journals Fatigue life prediction in a door hinge system under uni-axial and multi-axial loading conditions

2021 ◽  
Author(s):  
Sacheen Bekah
Keyword(s):  
Axial Loading ◽  
Fatigue Analysis ◽  
Design Stage ◽  
Fe Model ◽  
Preliminary Design ◽  
Standard Requirement ◽  
Ground Vehicle ◽  
Design Engineers ◽  
Door Hinge ◽  
Preliminary Design Stage

This thesis presents the use of Finite Element (FE) based fatigue analysis to locate the critical point of crack initiation and predict life in a door hinge system that is subjected to both uni-axial and multi-axial loading. The results are experimentally validated. The FE model is further used to obtain an optimum design per the standard requirement in the ground vehicle industry. The accuracy of the results showed that FE based fatigue analysis can be successfully employed to reduce costly and time-consuming experiments in the preliminary design stage. Numerical analysis also provides the product design engineers with substantial savings, enabling the testing of fewer prototypes.

scholarly journals Fatigue life prediction in a door hinge system under uni-axial and multi-axial loading conditions

2021 ◽  
Author(s):  
Sacheen Bekah
Keyword(s):  
Axial Loading ◽  
Fatigue Analysis ◽  
Design Stage ◽  
Fe Model ◽  
Preliminary Design ◽  
Standard Requirement ◽  
Ground Vehicle ◽  
Design Engineers ◽  
Door Hinge ◽  
Preliminary Design Stage

This thesis presents the use of Finite Element (FE) based fatigue analysis to locate the critical point of crack initiation and predict life in a door hinge system that is subjected to both uni-axial and multi-axial loading. The results are experimentally validated. The FE model is further used to obtain an optimum design per the standard requirement in the ground vehicle industry. The accuracy of the results showed that FE based fatigue analysis can be successfully employed to reduce costly and time-consuming experiments in the preliminary design stage. Numerical analysis also provides the product design engineers with substantial savings, enabling the testing of fewer prototypes.

scholarly journals An Approximate Method for Calculation of Mean Statistical Value of Ship Service Speed on a Given Shipping Line , Useful in Preliminary Design Stage

2015 ◽  
Vol 22 (1) ◽  
pp. 28-35
Author(s):  
Katarzyna Żelazny
Keyword(s):  
Wind Waves ◽  
Parametric Method ◽  
Weather Conditions ◽  
Economic Effects ◽  
Design Stage ◽  
Design Parameters ◽  
Preliminary Design ◽  
Screw Propeller ◽  
Calm Water ◽  
Preliminary Design Stage

Abstract During ship design, its service speed is one of the crucial parameters which decide on future economic effects. As sufficiently exact calculation methods applicable to preliminary design stage are lacking the so called contract speed which a ship reaches in calm water is usually applied. In the paper [11] a parametric method for calculation of total ship resistance in actual weather conditions (wind, waves, sea current), was presented. This paper presents a parametric model of ship propulsion system (screw propeller - propulsion engine) as well as a calculation method, based on both models, of mean statistical value of ship service speed in seasonal weather conditions occurring on shipping lines. The method makes use of only basic design parameters and may be applied in preliminary design stage.

Risk Evaluation at the Preliminary Design Stage of a High-Speed Craft

2004 ◽  
Vol 20 (03) ◽  
pp. 183-187
Author(s):  
Richard Birmingham ◽  
Jon McGregor ◽  
Severine Delautre ◽  
Jean-Claude Astrugue
Keyword(s):  
High Speed ◽  
Design Tool ◽  
Transport Infrastructure ◽  
Design Stage ◽  
Safety Issues ◽  
Research Areas ◽  
Marine Industry ◽  
Preliminary Design Stage ◽  
Eu Project ◽  
The Eu

Due to the congestion of the traditional transport infrastructure across Europe, the EU has developed the EU Common Transport Policy. This policy endorses the use of waterborne craft to ease onshore congestion. In addition to this there have been follow-up measures in the form of "short sea shipping" and lately the concept of "quality shipping" has surfaced to allay concerns arising from the standards of shipping. It is with this backdrop that an increase in demand for high-speed craft (HSC) has occurred. This in turn has created new concerns of how the safety of HSC can be assured when there is such a lack of historical data. To deal with these concerns, there has been a call for new design tools and methodologies to be developed that raise the profile of safety issues from the very beginning of the design process. It was with this in mind that funding was granted for an EU project called Safety at Speed (S@S), the details of which are described in the paper. S@S is made up of 15 partners spread throughout the EU. The partners come from all areas of the marine industry, including universities, designers/builders, class societies, and operators. The project has been split into six research areas. These are collision and grounding, motions, foundering, containment of damage and fire, integration, and case study. The paper is written from the perspective of the integration work package and describes in detail the driving "vision" behind the project. The perceived structure of the project is examined. The problems that the partners have had to overcome are laid out. These problems have led to an evolution of the interrelationships of work packages. The paper goes on to discuss the use of parameters and how their different forms can be incorporated into the design tool with reference to vast fluctuations in quality of input data. Finally, there is a discussion of how the output results from use of the tool, both for risk and cost, can most usefully be presented.

An Approximate Method for Cross Curves of Cargo Vessels

2001 ◽  
Vol 38 (02) ◽  
pp. 92-94
Author(s):  
Huseyin Yilmaz ◽  
Mesut Giiner
Keyword(s):  
Prediction Method ◽  
Design Stage ◽  
Series Data ◽  
Design Parameters ◽  
Preliminary Design ◽  
Hull Form ◽  
Beam Depth ◽  
Preliminary Design Stage ◽  
The Mathematical Model ◽  
Load Conditions

In this study, a formula is presented to estimate cross curves of cargo vessels and to predict statical stability at the preliminary design stage of the vessel. The predictive technique is obtained by regression analysis of systematically varied cargo vessel series data. In order to achieve this procedure, some cargo vessel forms are generated using Series-60. The mathematical model in this predictive technique is constructed as a function of design parameters such as length, beam, depth, draft, and block coefficient. The prediction method developed in this work can also be used to determine the effect of specific hull form parameters and the load conditions on stability of cargo vessels. The present method is applied to a cargo vessel and then the results of the actual ship are compared with those of regression values.

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