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

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.

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The Development of an Expert System for Finding Fragility Curves of Building Structural Systems in the Preliminary Design Stage

Artificial Intelligence and Other Innovative Computer Applications in the Nuclear Industry ◽

10.1007/978-1-4613-1009-9_94 ◽

1988 ◽

pp. 769-774 ◽

Cited By ~ 1

Author(s):

Lone-Yee Yee ◽

David Okrent

Keyword(s):

Expert System ◽

Fragility Curves ◽

Design Stage ◽

Structural Systems ◽

Preliminary Design ◽

Preliminary Design Stage

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

10.32920/ryerson.14657634 ◽

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.

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

10.32920/ryerson.14657634.v1 ◽

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.

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

Polish Maritime Research ◽

10.1515/pomr-2015-0005 ◽

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.

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

Journal of Ship Production ◽

10.5957/jsp.1995.11.4.252 ◽

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.

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An Approximate Method for Cross Curves of Cargo Vessels

Marine Technology and SNAME News ◽

10.5957/mt1.2001.38.2.92 ◽

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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GLOBAL ANALYSIS OF THE AIRCRAFT STRUCTURE AND ITS APPLICATION TO THE PRELIMINARY DESIGN STAGE

Aviation ◽

10.3846/16487788.2005.9635908 ◽

2005 ◽

Vol 9 (3) ◽

pp. 29-35

Author(s):

Jerzy Bakunowicz ◽

Tomasz Kopecki

Keyword(s):

Numerical Model ◽

Global Analysis ◽

Economic Factor ◽

Computer Application ◽

Local Analysis ◽

Design Stage ◽

Preliminary Design ◽

Preliminary Design Stage ◽

Sufficient Strength ◽

Made In

Modern aircraft safety depends on sufficient strength and rigidity of the structure. This must sustain with lightest possible weight, because any excess mass has not only detrimental effect upon the performance but also is significant economic factor. The most rational way to achieve the proper structure seems to be global analysis commenced in the preliminary design stage already. The analysis outcomes provide base for local analysis of the details led parallel. Any revisions more or less relevant can be made in the numerical model with very expensive prototype changes avoiding. The paper illustrates efficiency of the airframe structure global analysis. As examples the aircrafts still in service but designed without computer application were chosen. The finite elements numerical model of each was created and some critical in-flight load cases were simulated.

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