scholarly journals DIGITALIZATION OF DIAGRAMS FOR DETERMINING COEFFICIENTS OF WATER RESIDUAL RESISTANCE TO SHIP’S MOVEMENT

2019 ◽  
pp. 16-25
Author(s):  
Konstantin Pavlovich Abolyanin ◽  
Vasiliy Vladimirovich Shurygin ◽  
Ali Salamekh
Keyword(s):  
Water Resistance ◽  
Data Entry ◽  
Automated Analysis ◽  
Residual Water ◽  
Shipbuilding Industry ◽  
Ship Propulsion ◽  
Demonstration Analysis ◽  
Cad System ◽  
Weak Points ◽  
System Requirements

The article presents calculating the water resistance to the movement of the vessel, which is quite difficult and time-consuming task. The accuracy of solving this task directly affects the analysis of the ship propulsion. The programs of automated analysis of ship propulsion have become very popular in the shipbuilding industry; they help to increase the efficiency of solving these problems. The existing programs of digitizing graphs have been analyzed. Digitalization comprises building a graph in CAD system with further transforming the file into DFX format in the developed program. A new program for digitizing diagrams which are used in calculating water resistance to the vessel movement has been proposed. The algorithm and operation principle have been presented, as well as a distinctive feature of the developed program. The minimum system requirements for installing the program on a personal computer are indicated. The demonstration analysis of the program by input of source data for calculation and the output area of the work report were made. Based on a diagram representing the dependences of the coefficient of residual water resistance to the movement of the vessel on the overall completeness coefficient for the V-shaped bow of the vessel there is given an example of the sequence of data entry methods and getting results. There have been stated the advantages and weak points of Wizard DFX Digitizer software compared to other means of graphs digitalization. The advantages are: reduced time for graph digitalization and growing precision of the results due to application of CAD tools, ability to save digitizing results and friendly CAD system interface. The weak points are: manual digitizing process, the need to take into account certain specific features of each CAD system.

Design and Implementation of an Intelligent CAD System

1987 ◽  
Author(s):  
M. J. Jakiela ◽  
P. Y. Papalambros
Keyword(s):  
Computer Aided Design ◽  
Design System ◽  
Knowledge Based Systems ◽  
Production Rules ◽  
Automated Assembly ◽  
Cad System ◽  
Design And Implementation ◽  
Knowledge Based ◽  
System Requirements ◽  
Aided Design

Abstract System requirements and system design for integrating a production rule program and a computer aided design system are presented. An implementation using a commercially available graphics modeling system is described. A “suggestive mode” interface is programmed as an example with application to design for automated assembly. Initial use of the implementation indicates that encoding production rules is more difficult than with conventional text-only knowledge-based systems, but that this system is a more effective way to use artificial intelligence techniques in design.

scholarly journals Alternative Closed-Cycle Gas Turbine System Design Considerations for Ship Propulsion Applications

1978 ◽  
Author(s):  
S. C. Kuo ◽  
H. T. Shu
Keyword(s):  
Power Systems ◽  
System Design ◽  
Gas Turbine ◽  
Mechanical Design ◽  
Closed Cycle ◽  
Ship Propulsion ◽  
Design Alternatives ◽  
System Requirements ◽  
Optimal System Design ◽  
Selection Of

This paper discusses the major system design alternatives considered in a comprehensive system study of closed-cycle gas turbine propulsion systems for advanced ship propulsion applications. The general requirements and constraints applicable to propulsion engines for advanced ships were reviewed, and major design variances from the traditional land-based closed-cycle gas turbine power systems were identified. The potential impact of these system requirements and design variances will have on the selection of thermodynamic and mechanical design alternatives applicable to the power conversion system were evaluated, and some trade-off considerations, including the domain of optimal system design, are discussed.

Design and Implementation of a Prototype ‘Intelligent’ CAD System

1989 ◽  
Vol 111 (2) ◽  
pp. 252-258 ◽  
Author(s):  
M. J. Jakiela ◽  
P. Y. Papalambros
Keyword(s):  
Computer Aided Design ◽  
Design System ◽  
Production Rules ◽  
Automated Assembly ◽  
Knowledge Domains ◽  
Cad System ◽  
Design And Implementation ◽  
Knowledge Based ◽  
System Requirements ◽  
Aided Design

System requirements and system design for integrating a production rule program and a computer aided design system are presented. An implementation using a commercially available graphics modeling system is described. A “suggestive mode” interface is programmed as an example with application to design for automated assembly. Initial use of the implementation indicates that encoding production rules is more difficult than with conventional text-only knowledge-based system, but that this system is a more effective way to use artificial intelligence techniques in design. The system is intended for use with knowledge domains that are not well represented by usual analytical means.

Calculation of the Sankey diagram for ship propulsion plants using online simulators

2021 ◽  
Author(s):  
Edgar Steven Chavez ◽  
Erick Galarza ◽  
Jhonatan Lulo ◽  
Nain Maximo Ramos ◽  
Víctor Acosta ◽  
...  
Keyword(s):  
Operating Conditions ◽  
Image Correlation ◽  
Shipbuilding Industry ◽  
Reduced Order ◽  
Ship Propulsion ◽  
Fishing Vessels ◽  
Digital Twins ◽  
Main Engine ◽  
Innovative Techniques ◽  
Navigation Condition

In recent years, the shipbuilding industry has been incorporating different technological innovations that adapt innovative techniques such as image correlation for 3D reconstruction, reduced order modeling methods for digital twins, pixel amplification techniques to measure vibrations, among other methodologies. The advancement of these methodologies help to obtain visual resources that allow a better understanding of a given phenomenon, which complements the results found numerically, analytically or experimentally. The present study collects data from different configurations of ship propulsion plants, which are based on real operating conditions. The operating conditions are given for fishing vessels; the "navigation" condition is selected as being the most frequent and the "fishing operation" as being the most energetically critical. These conditions are attached to the choice of the ship's propeller. For the propeller, the diameter, the number of blades and the length of the drive shaft from the main engine position to the propeller are considered. Three engine power levels (low, medium and high) are selected, represented by 300, 850 and 1300 HP engines. The aforementioned operating conditions are used to calculate the efficiency of the propulsion plant, obtaining several combinations. Furthermore, these configurations are expressed by means of Sankey diagrams and illustrations of the plant configurations in 3D using WebGL and Threejs libraries. Complementarily, these data are observed in an online simulator called "ShipSim", using "html" coding.

SPECTRA: A program for processing electron images of crystals

1992 ◽  
Vol 50 (1) ◽  
pp. 132-133
Author(s):  
M.F. Schmid ◽  
R. Dargahi ◽  
M. W. Tam
Keyword(s):  
Lattice Distortion ◽  
Data Transfer ◽  
Reciprocal Lattice ◽  
Data Entry ◽  
Image Data ◽  
Distortion Correction ◽  
Specimen Preparation ◽  
Electron Image ◽  
Computer Controlled ◽  
Program Modules

Electron crystallography is an emerging field for structure determination as evidenced by a number of membrane proteins that have been solved to near-atomic resolution. Advances in specimen preparation and in data acquisition with a 400kV microscope by computer controlled spot scanning mean that our ability to record electron image data will outstrip our capacity to analyze it. The computed fourier transform of these images must be processed in order to provide a direct measurement of amplitudes and phases needed for 3-D reconstruction.In anticipation of this processing bottleneck, we have written a program that incorporates a menu-and mouse-driven procedure for auto-indexing and refining the reciprocal lattice parameters in the computed transform from an image of a crystal. It is linked to subsequent steps of image processing by a system of data bases and spawned child processes; data transfer between different program modules no longer requires manual data entry. The progress of the reciprocal lattice refinement is monitored visually and quantitatively. If desired, the processing is carried through the lattice distortion correction (unbending) steps automatically.

Better Data Entry: Double Entry Is Superior to Visual Checking

2008 ◽  
Author(s):  
Kimberly A. Barchard ◽  
Jenna Scott ◽  
David Weintraub ◽  
Larry A. Pace
Keyword(s):  
Data Entry ◽  
Double Entry
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