Sensitivity of Models Applied in Selected Simulation Systems with Respect to Database Quality for Resolving of Casting Problems

2013 ◽  
Vol 336 ◽  
pp. 135-146 ◽  
Author(s):  
Zenon Ignaszak ◽  
Paweł Popielarski ◽  
Jakub Hajkowski
Keyword(s):  
Product Design ◽  
Complex Model ◽  
Shrinkage Porosity ◽  
Engineering Industry ◽  
Knowledge Level ◽  
Porosity Formation ◽  
Mathematical Formula ◽  
Simulation Tools ◽  
Process Virtualization ◽  
Simulation Systems

This paper highlights permanent development of process virtualization in the mechanical engineering industry, especially in the area of foundry. Virtualization is increasingly developed on the stage of product design and materials technologies optimization. Simultaneously, increasing expectations of design and process engineers regarding the practical effectiveness of applied simulation systems is observed. To enhance the knowledge in the scope of modelling and simulation in the foundry processes, one should be acquainted with the hard modelling based on physical-mathematical formula and also the soft modelling, burdened with simplifications resulting from both knowledge level on description of particular phenomena and level of theirs complexity. The trends observed in modelling of foundry processes and expectations of users compared with creators upgraded propositions new, additional modules based mostly on poorly tested theory are discussed. In such cases, each new module should be tested on sensitivity of additional parameters, which appear in these new modules. If needed and possible, these tests ought to be related to validation of the whole complex model containing such new modules. The purpose is to obtain simulation tools allowing the most possible realistic prognosis of the casting structure, including indication, with the highest possible probability, places in the casting that are endangered with the possibility of a gas and shrinkage porosity formation. These problems with elements of model validation are presented in the paper.

scholarly journals Examples of New Models Applied in Selected Simulation Systems with Respect to Database

2013 ◽  
Vol 13 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Z. Ignaszak ◽  
J. Hajkowski ◽  
P. Popielarski
Keyword(s):  
Engineering Industry ◽  
New Approach ◽  
Simulation Tools ◽  
Gas Porosity ◽  
Local Stresses ◽  
New Models ◽  
Process Virtualization ◽  
Simulation Systems ◽  
Damage Rule

Abstract The tolerance of damage rule progressively meets the approval in the design casting parts procedures. Therefore, there were appeared the new challenges and expectations for permanent development of process virtualization in the mechanical engineering industry. Virtualization is increasingly developed on the stage of product design and materials technologies optimization. Increasing expectations of design and process engineers regarding the practical effectiveness of applied simulation systems with new proposed up-grades modules is observed. The purpose is to obtain simulation tools allowing the most possible realistic prognosis of the casting structure, including indication, with the highest possible probability, places in the casting that are endangered with the possibility of shrinkage- and gas porosity formation. This 3D map of discontinuities and structure transformed in local mechanical characteristics are used to calculate the local stresses and safety factors. The needs of tolerance of damage and new approach to evaluate the quality of such prognosis must be defined. These problems of validation of new models/modules used to predict the shrinkage- and gas porosity including the chosen structure parameters in the example of AlSi7 alloy are discussed in the paper.

On Factors Influencing Macro Shrinkage Porosity Formation in Compacted Graphite Iron

2014 ◽  
Vol 790-791 ◽  
pp. 429-434 ◽  
Author(s):  
Sadaf Vazehrad ◽  
Jessica Elfsberg ◽  
Attila Diószegi
Keyword(s):  
Elevated Temperatures ◽  
Carbon Film ◽  
Shrinkage Porosity ◽  
Compacted Graphite Iron ◽  
Porosity Formation ◽  
Porosity Level ◽  
Compacted Graphite ◽  
Factors Influencing

The purpose of this work is to investigate the relation between macro shrinkage porosity level and the level of graphite nodularity, gaseous elements and the size of eutectic colonies in compacted graphite iron. Also, the internal shrinkage-pore surfaces were analyzed by SEM and EDS techniques. It was found that samples with higher shrinkage porosity level, contained higher level of graphite nodularity and number of eutectic colonies. Also, samples with higher level of gaseous elements (Hydrogen and Nitrogen) showed higher tendency to shrinkage porosity formation. Austenite dendrites with different morphologies were observed inside the pores, indicating that were formed at different times during solidification, and the surface of the pores were covered with a layer of carbon film indicating that the pores were internal, with no contact to the atmosphere at elevated temperatures.

scholarly journals APPLICATION EXPERIENCE OF COMPUTER SIMULATION SYSTEMS TO INCREASE THE EFFICIENCY OF FOUNDRY PRODUCTION AT THE ROSTOV FOUNDRY

2018 ◽  
pp. 72-76
Author(s):  
A. V. Fedosov ◽  
G. V. Chumachenko
Keyword(s):  
Computer Simulation ◽  
Systematic Approach ◽  
Practical Application ◽  
Simulation Tools ◽  
Shrinkage Defects ◽  
Gate System ◽  
System Equations ◽  
Simulation Results ◽  
Definition Of ◽  
Simulation Systems

The stages of introduction of computer simulation tools in the production process of The Rostov Foundry are considered. A system for estimating the results of simulation is proposed, which includes the definition of complex parameters that allow an assessment of the causes and the probability of formation of shrinkage defects. An equation that determines a relationship between results of simulation and actual rejects in production is proposed. The feeder operation index is suggested to use for estimation of the reasons for the formation of shrinkage defects. The yield index is suggested to evaluate the possibility of reducing the weight of gate system. Equations for calculating of these indices are developed. A systematic approach is presented for the application of simulation results, which provides for the organization of a database of the technologies being studied. The development of this base allows not only to accumulate the experience, but also to apply it to minimize errors and save time in the process of introducing new castings. The results of practical application of the developed system for 10 positions are presented, which allowed to increase the yield by 6.9% and to reduce the total defects rate by 5.1%.

Virtual Manufacturing Tools in the Product Design Environment

1999 ◽  
Author(s):  
Ronald C. Braun ◽  
Warren G. Marx
Keyword(s):  
Product Development ◽  
Product Design ◽  
Three Dimensional ◽  
Virtual Manufacturing ◽  
Assembly Planning ◽  
Shop Floor ◽  
Design Environment ◽  
Support Design ◽  
Simulation Tools ◽  
Lean Product Development

Abstract Design and manufacturing modeling and simulation have been identified as important to the principles of lean product development. Early in the product development cycle, the use of three-dimensional (3-D) engineering models allows us to electronically (or virtually) prototype physical products, and conduct product feasibility and producibility studies. Manufacturing issues can be identified early and used to drive the product design toward the lowest cost. This paper describes the Northrop Grumman Corporation (NGC) approach to extending classic prototype simulation to virtual manufacturing (VM) tools that accommodate the visualization of interacting production processes, process planning, scheduling, and assembly planning. Previous simulation tools were limited to the design environment. Our tools not only support design; they also provide functionality by bringing the results to the assembly floor. The use of these tools has resulted in “first-time quality” both above and on the shop floor, with significant reductions in product cost and cycle time.

scholarly journals Practical Benefits of Aspect-Oriented Programming Paradigm in Discrete Event Simulation

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Meriem Chibani ◽  
Brahim Belattar ◽  
Abdelhabib Bourouis
Keyword(s):  
Discrete Event Simulation ◽  
Discrete Event ◽  
Separation Of Concerns ◽  
Quality Factors ◽  
Crosscutting Concerns ◽  
Simulation Tools ◽  
Event Simulation ◽  
Aspect Oriented Modeling ◽  
Simulation Systems

Aspect-oriented modeling and simulation is a new approach which uses the separation of concerns principle to enhance the quality of models and simulation tools. It adopts the separation of concerns (SOC) principle. Thus, crosscutting concerns such as processes synchronization, steady state detection, and graphical animation could be separated from simulation functional modules. The capture of crosscutting concerns in a modular way is carried out to cope with complexity and to achieve the required engineering quality factors such as robustness, modularity, adaptability, and reusability. This paper provides a summary of aspect-oriented paradigm with its usage in simulation by illustrating the main crosscutting concerns that may infect simulation systems. A practical example is given with the use of the Japrosim discrete event simulation library.

Materials Design, Development, and Deployment in Manufacturing Industry

2020 ◽  
pp. 251-265
Author(s):  
B. P. Gautham ◽  
Sreedhar Reddy
Keyword(s):  
Modeling And Simulation ◽  
Product Design ◽  
Manufacturing Industry ◽  
Digital Technologies ◽  
Contextual Knowledge ◽  
Design Development ◽  
Design And Development ◽  
Digital Platforms ◽  
Simulation Tools ◽  
Data Driven Modeling

The materials and manufacturing industry is undergoing transformation through adoption of various digital technologies. Though the adoption of digital platforms for operational needs is significant, their adoption for core design and development of products and their manufacturing are limited. While the use of physics and data-driven modeling-and-simulation tools is increasing, these are not systematically leveraged for larger benefit. Besides these tools, product design and development requires deep contextual knowledge necessitating systematic capture of data and knowledge. To achieve this, we need flexible digital platforms that enable integration of diverse design domains and tools through a common semantic basis and construction of engineering decision workflows leveraging various simulation tools and knowledge. This chapter builds these requirements through presenting three case studies from the materials manufacturing industry and presents requirements for a digital platform. Finally, one such platform, TCS PREMAP, being developed by the authors is described in some detail.

Software Product Design: An Organizing Concept for Software Engineering Education

1990 ◽  
Vol 5 (1) ◽  
pp. 37-40
Author(s):  
Ian Bray ◽  
Orville Jones ◽  
Stephen Webster
Keyword(s):  
Software Engineering ◽  
Engineering Education ◽  
Product Design ◽  
Engineering Management ◽  
Engineering Industry ◽  
Software Engineering Education ◽  
Alternative Approach ◽  
Software Product ◽  
Software Engineers

This paper contributes to the continuing debate on the curriculum for undergraduate software engineering degrees. It describes the rationale for and content of the new honours programme in Software Engineering Management at the Dorset Institute. The well documented problems which persist in the software engineering industry are, we believe, largely attributable to the inappropriate education of software engineers. An alternative approach to the education of undergraduate software engineers is outlined; one which is based upon the concept of ‘software as a product’.

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