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Attachment of Mating Faces: an Interrelational Feature Approach
KTH, Superseded Departments, Machine Design.
1998 (English)In: 8th Int. ANSYS Conference, August 17-19 1998, Pittsburgh, PA, USA, 1998Conference paper (Other academic)
Abstract [en]

Many engineering systems are characterized by a physical behavior that to a large extent is determined by complex interactions between subsystems. FE modeling and simulation of the physical behavior of complex systems is enabled by methods and technologies that allow subsystems to be modeled independently of other subsystems, and where systems models can be aggregated from a set of submodels, that that may be defined at various levels of abstraction, i.e. detailed, coarse, and condensed superelements. A method to attach pairs of nodally incompatible submodels is presented in this paper. A major benefit of the approach is that FE submodels and superelements are treated with the same formalism. The essence of the approach starts by first establishing a master-slave relation between sets of nodes on mating faces, followed by a Delaunay triangulation of the selected master node set, and finally a step where each slave nodal degree of freedom (DOF) is mapped to the DOFs of the three most appropriate master nodes. The method is robust and it has been developed as a support tool for FE modeling and simulation of multiphysics behavior of complex systems. It has been implemented in the general purpose FE software ANSYS as a macro library.

Place, publisher, year, edition, pages
URN: urn:nbn:se:kth:diva-19451OAI: diva2:338046
QC 20100810Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2010-08-11Bibliographically approved
In thesis
1. Simulation-driven design: Motives, Means, and Opportunities
Open this publication in new window or tab >>Simulation-driven design: Motives, Means, and Opportunities
1999 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Efficiency and innovative problem solving are contradictory requirements for productdevelopment (PD), and both requirements must be satisfied in companies that strive to remainor to become competitive. Efficiency is strongly related to ”doing things right”, whereasinnovative problem solving and creativity is focused on ”doing the right things”.Engineering design, which is a sub-process within PD, can be viewed as problem solving or adecision-making process. New technologies in computer science and new software tools openthe way to new approaches for the solution of mechanical problems. Product datamanagement (PDM) technology and tools can enable concurrent engineering (CE) bymanaging the formal product data, the relations between the individual data objects, and theirrelation to the PD process. Many engineering activities deal with the relation betweenbehavior and shape. Modern CAD systems are highly productive tools for conceptembodiment and detailing. The finite element (FE) method is a general tool used to study thephysical behavior of objects with arbitrary shapes. Since a modern CAD technology enablesdesign modification and change, it can support the innovative dimension of engineering aswell as the verification of physical properties and behavior. Concepts and detailed solutionshave traditionally been evaluated and verified with physical testing. Numerical modeling andsimulation is in many cases a far more time efficient method than testing to verify theproperties of an artifact. Numerical modeling can also support the innovative dimension ofproblem solving by enabling parameter studies and observations of real and syntheticbehavior. Simulation-driven design is defined as a design process where decisions related tothe behavior and performance of the artifact are significantly supported by computer-basedproduct modeling and simulation.A framework for product modeling, that is based on a modern CAD system with fullyintegrated FE modeling and simulation functionality provides the engineer with tools capableof supporting a number of engineering steps in all life-cycle phases of a product. Such aconceptual framework, that is based on a moderately coupled approach to integratecommercial PDM, CAD, and FE software, is presented. An object model and a supportingmodular modeling methodology are also presented. Two industrial cases are used to illustratethe possibilities and some of the opportunities given by simulation-driven design with thepresented methodology and framework.

Place, publisher, year, edition, pages
Stockholm: KTH, 1999. vi, 42 p.
Trita-MMK, ISSN 1400-1179 ; 1999:26
CAD, CAE, FE method, Metamodel, Object model, PDM, Physical behavior, System
urn:nbn:se:kth:diva-2875 (URN)99-3055738-5 (ISBN)
Public defence
1999-12-01, 00:00
QC 20100810Available from: 2000-01-01 Created: 2000-01-01 Last updated: 2010-08-11Bibliographically approved

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