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.

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.

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.

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.

Predicting the performance of structures in regions of high seismicity

1976 ◽  
Vol 3 (1) ◽  
pp. 138-155
Author(s):  
Joseph Penzien
Keyword(s):  
Time History ◽  
Strong Motion ◽  
Design Stage ◽  
Preliminary Design ◽  
Sound Design ◽  
Design Procedures ◽  
Dynamic Analyses ◽  
Preliminary Design Stage ◽  
Complete Process ◽  
Selection Of

The complete seismic design process of certain important structures based on time-history dynamic analyses is traced from the initial preliminary design stage through the final stage of predicting lifetime performance to strong motion earthquakes. Emphasis is placed upon (1) selection of sound design procedures, (2) consideration of field and laboratory evidence, (3) application of present day knowledge, and (4) recognition of uncertainties involved in the complete process. It is concluded that meaningful predictions of performance can be made only when formulated in a probabilistic sense.

Intelligent Selection of Main Engine at the Preliminary Design Stage of Ships

1995 ◽  
Vol 11 (04) ◽  
pp. 245-251
Author(s):  
Dongkon Lee ◽  
Kyung-Ho Lee ◽  
Soon-Hung Han
Keyword(s):  
User Interface ◽  
Operating Cost ◽  
Knowledge Bases ◽  
Propulsion System ◽  
Design Stage ◽  
Preliminary Design ◽  
Preliminary Design Stage ◽  
The Right ◽  
Main Engine ◽  
Selection Of

The propulsion system is one of the most complicated systems in a ship and its performance greatly depends on the selection of the main engine. Also, the propulsion system occupies a large portion of the total shipbuilding cost, as well as a large portion of the annual operating cost in fuel consumption. Selecting the right propulsion system is an important factor consideration for shipowners and designers. In the preliminary stage of ship design, the main engine is selected by a design expert and this usually is a difficult task for a novice designer. With the help of a design support system, efficiency in selecting the right engine can be increased. In this study, a knowledge-based system for engine selection which can be used in the preliminary design stage for a merchant ship has been developed. The knowledge base is constructed using heuristic knowledge acquired from design experts. Two databases of engine catalogs and of existing ships are also constructed. Various performance prediction modules of the domain of naval architecture are integrated with the knowledge bases and databases. To enhance the user interface, a graphical user interface (GUI) built upon the Motif widgets is adapted.

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.

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