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.

Design charts for the selection of acoustical enclosures for diesel engine generator sets

2003 ◽  
Vol 217 (3) ◽  
pp. 329-336 ◽  
Author(s):  
T. A. Osman
Keyword(s):  
Diesel Engine ◽  
Insertion Loss ◽  
Design Stage ◽  
Preliminary Design ◽  
Generating Sets ◽  
Design Charts ◽  
Wide Range ◽  
Preliminary Design Stage ◽  
Generator Sets ◽  
Selection Of

It has been realized that attenuation of the noise radiated from diesel engine generating sets is a challenge for the designer. The enclosure, which may be designed for noise reduction, has to allow for the flow of the necessary amount of air. The present work is an attempt to tackle such a contradictory problem. A mathematical model is developed to predict the enclosure design configuration. The parameters affecting the insertion loss, such as enclosure and silencer dimensions, number of baffles, and sound absorption material specifications are taken into account. To verify the developed model, experimental measurements based on ISO 8528 part 10 are conducted. Four different generating sets covering a wide range of power rating are employed. The effect of changing each parameter on the insertion loss is studied separately for the chosen range. Design charts, based on the results of the present investigation, are constructed to facilitate the section of a proper acoustical enclosure configuration at the preliminary design stage.

scholarly journals Determination of Regression Formulas for Key Design Characteristics of Container Ships at Preliminary Design Stage

2018 ◽  
Vol 1 (1) ◽  
pp. 247-257
Author(s):  
Tomasz Abramowski ◽  
Tomasz Cepowski ◽  
Peter Zvolenský
Keyword(s):  
Design Theory ◽  
Theory Development ◽  
Ship Design ◽  
Total Power ◽  
Design Stage ◽  
Preliminary Design ◽  
Regression Equations ◽  
Container Ship ◽  
Preliminary Design Stage ◽  
Design Characteristics

Abstract This article presents regression equations to estimate container ship design characteristics based on the most up-to-date data and deadweight capacity, the number of containers and their combination at the preliminary design stage. These design formulas could have application for the estimation of key container ship characteristics such as: main ship dimensions, geometric parameters, main engine total power, ship velocity, final price and others. Regression equations were performed on the basis of IHS Maritime & Trade main container ship data built from 2005-2015. All equations presented in this paper could have practical application at the preliminary design stage and increase ship design theory development.

scholarly journals ОСОБЕННОСТИ ИНТЕГРИРОВАННОГО ПРОЕКТИРОВАНИЯ ГРАЖДАНСКИХ ЛЕГКИХ САМОЛЕТОВ С ТУРБОВИНТОВЫМИ ДВИГАТЕЛЯМИ НА ЭТАПЕ ПРЕДВАРИТЕЛЬНОГО ПРОЕКТИРОВАНИЯ

2018 ◽  
pp. 13-23
Author(s):  
А. Г. Гребеников ◽  
А. М. Гуменный ◽  
Л. Ю. Буйвал
Keyword(s):  
Software Package ◽  
Optimality Criterion ◽  
Design Stage ◽  
Preliminary Design ◽  
Wide Range ◽  
Preliminary Design Stage

The analysis of changes in the parameters and characteristics of civilian light aircraft. New ways of improving its quality, improving tactical, technical and flight characteristics to meet a wide range of areas of its using have been proposed. The limits of change are established and the statistical ranges of parameters and characteristics of civilian light aircraft are refined. Recommendations are given on the method for determining the take-off mass of a civilian light aircraft with turboprop engines at the preliminary design stage in accordance with the optimality criterion - the minimum take-off mass. The features of the software package and its approbation during the development of KhAI-90 civil light aircraft preliminary project are described.

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.

Techno-Economic Optimization of an LNG Carrier with Multicriteria in the Preliminary Design Stage

1996 ◽  
Vol 12 (03) ◽  
pp. 141-152
Author(s):  
Dongkon Lee ◽  
Soo-Young Kim
Keyword(s):  
Objective Function ◽  
Multicriteria Optimization ◽  
Ship Design ◽  
Hybrid Optimization ◽  
Operating Costs ◽  
Design Stage ◽  
Preliminary Design ◽  
Relative Importance ◽  
Economic Optimization ◽  
Preliminary Design Stage

When economic optimization is considered in the preliminary design of a ship, required freight rate (RFR) is usually taken as the objective function because it is related to the building and the operating costs of a ship, reflecting the interest of both the shipyard and the shipowner. However, the choice of RFR as the objective function sometimes has an adverse effect on the designer. For example, to analyze the effect on the objective function of change of the building and operating costs, a sensitivity analysis is required for each item. That is, the relative importance of the two costs, when constructing a design model, is not obvious as they are combined together. In order to overcome the limitation of single objective optimization, a multicriteria optimization method has been used. To solve the multicriteria optimization problem with efficiency, a hybrid optimization solver is developed by coupling the genetic algorithm and the direct search method. Furthermore, to accelerate the searching speed of the solver in the design space, an Al (artificial intelligence) technique is applied to the hybrid optimization solver. It is applied to the optimum design of a liquified natural gas (LNG) carrier in the preliminary design stage. Through application to the ship design, the relative importance between the operating and building cost in the economic analysis of the ship design was manifested.

SYSTEM ANALYSIS AND SYNTHESIS OF GAS-TURBINE STAGES AERODYNAMIC PERFORMANCE

2021 ◽  
pp. 15-21
Author(s):  
V. F. Bezjazychnyj ◽  
K. A. Vinogradov ◽  
O. V. Vinogradova ◽  
V. A. Fadeev
Keyword(s):  
Gas Turbine ◽  
System Analysis ◽  
Optimization Problems ◽  
Design Stage ◽  
Preliminary Design ◽  
Reference Information ◽  
Wide Range ◽  
Analysis And Synthesis ◽  
Preliminary Design Stage ◽  
System Improvement

A method for system improvement of gas turbine flow-passage at the preliminary design stage is proposed. The results of 1D aerodynamic calculation is the reference information. Based on the obtained structural parametrical models a wide range of analysis, synthesis and optimization problems can be solved, as well as uncertainty quantification problem for turbine blade permissible manufacture tolerances in batch production.

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.

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