A Model for Capturing Product Assembly Information

2005 ◽  
Vol 6 (1) ◽  
pp. 11-21 ◽  
Author(s):  
Sudarsan Rachuri ◽  
Young-Hyun Han ◽  
Sebti Foufou ◽  
Shaw C. Feng ◽  
Utpal Roy ◽  
...  
Keyword(s):  
System Level ◽  
Assembly Model ◽  
Product Model ◽  
Collaborative Environment ◽  
Mechanical Assemblies ◽  
Proposed Model ◽  
Electromechanical Products ◽  
Definition Of ◽  
And Behavior ◽  
Product Assembly

The important issue of mechanical assemblies has been a subject of intense research over the past several years. Most electromechanical products are assemblies of several components, for various technical as well as economic reasons. This paper provides an object-oriented definition of an assembly model called the Open Assembly Model (OAM) and defines an extension to the NIST Core Product Model (NIST-CPM). The assembly model represents the function, form, and behavior of the assembly and defines both a system level conceptual model and associated hierarchical relationships. The model provides a way for tolerance representation and propagation, kinematics representation, and engineering analysis at the system level. The assembly model is open so as to enable plug-and-play with various applications, such as analysis (FEM, tolerance, assembly), process planning, and virtual assembly (using VR techniques). With the advent of the Internet more and more products are designed and manufactured globally in a distributed and collaborative environment. The class structure defined in OAM can be used by designers to collaborate in such an environment. The proposed model includes both assembly as a concept and assembly as a data structure. For the latter it uses STEP. The OAM together with CPM can be used to capture the assembly evolution from the conceptual to the detailed design stages. It is expected that the proposed OAM will enhance the assembly information content in the STEP standard. A case study example is discussed to explain the Usecase analysis of the assembly model.

A New Fat-Model for Large-Scale Product Assembly

2012 ◽  
Vol 522 ◽  
pp. 776-782
Author(s):  
Jin Song Bao ◽  
Dian Liang Wu ◽  
Jin Ye
Keyword(s):  
Large Scale ◽  
Virtual Assembly ◽  
Modeling Language ◽  
Assembly Model ◽  
Aircraft Wings ◽  
Assembly Simulation ◽  
Definition Of ◽  
Component Assembly ◽  
Product Assembly ◽  
Digital Prototype

Large-scale component assembly, such as the installation of aircraft wings and ship section etc., is usually high cost, long cycle. Virtual assembly simulation gives the possibility of direct and visual perceive of assembly before the actual assembly using digital prototype. A new virtual assembly model, called VAFM (Virtual Assembly Fat Model), is presented. It integrates not only geometry data, but non-geometry information is embedded. All information of model will evolve, mature and derived gradually, from thin to fat, during the whole assembly process. The paper gives the definition of a VAFM, its framework and the evolution rules of the fat model. Meanwhile the paper design the modeling language based XML. Finally, the visualization of VAFM is also presented..

A Product-Level Rapid Modeling Method for Mesh Reflector Antenna

2014 ◽  
Vol 998-999 ◽  
pp. 565-568
Author(s):  
Zhi Hua Zhang ◽  
Shen Li ◽  
Peng Li
Keyword(s):  
Modeling Method ◽  
Adjustment Process ◽  
Assembly Model ◽  
Product Model ◽  
Design Efficiency ◽  
Product Level ◽  
Template Library ◽  
Rapid Modeling ◽  
Product Assembly

To solve the low design efficiency problem of complex product, a product-level rapid modeling method is proposed. Parametric template library is created firstly. Then a hierarchical product assembly model is constructed by the top-down variable design. Lastly product model is generated automatically by using the technologies of position constraints and semantic mapping. The method has been applied to a self-developed modeling system for mesh reflector antennas (MRA). The results show that it can generate the product model rapidly, improve the design efficiency greatly, and provide the model data support for the follow-up analysis, optimization and adjustment process.

Integrating Multibody Simulations With SysML

2015 ◽  
Author(s):  
Johannes Gross ◽  
Rudranarayan Mukherjee
Keyword(s):  
Simulation Models ◽  
System Model ◽  
System Level ◽  
Modeling Language ◽  
Combine System ◽  
Physics Simulation ◽  
Import And Export ◽  
Definition Of ◽  
Multi Body ◽  
And Behavior

In this paper we will show an integration of a JPL-internal multi body simulation tool within the Systems Modeling Language (SysML) tool MagicDraw. The SysML provides the means to model requirements, functions, structure and behavior of a system. Integrating a multi body physics simulation with this language creates a seamless way to combine system level questions with the detailed design. The integration allows for the import and export of the simulation models as well as the definition of metrics on the simulation. The system model can be used to express the requirements, the tests that verify the satisfaction and the implementation of the system according to these requirements. Having all the different aspects in one central model reduces the thread of inconsistencies through reuse and linking of model elements. The SysML model allows for an easier creation of large models and the integration with other disciplines is already prepared.

Consistency of Assembly Related Product Information: Part 1 — Representation

2014 ◽  
Author(s):  
Mehmet Murat Baysal ◽  
Utpal Roy
Keyword(s):  
Decision Making ◽  
Product Development ◽  
Information Exchange ◽  
Product Information ◽  
Spatial Relationships ◽  
Assembly Model ◽  
Product Lifecycle ◽  
Product Model ◽  
Space Requirements ◽  
And Behavior

In this work, NIST’s Core Product Model (CPM) and the Open Assembly Model (OAM) are extended to integrate product information including function and behavior, with an emphasis on assembly, throughout all phases of product development. The consistency validation of product information, and the verification of modified product information are discussed. These processes ensure that the product information has no contradictions and allows tracing through associations without any deficiency or disconnection. In other words, the information model has to be complete in terms of traceability of function, behavior, spatial relationships, etc., in order to support all information exchange activities. The product information representation provides a mechanism for capturing product information and storing it in a database. This representation schema also provides necessary information for any future decision making activities at the End_Of_Life (EOL) environment, such as the replacement or reuse of any part or subassembly. When there is a need to replace one artifact with another, one must consider all of the associations of the existing artifact with other artifacts and the environment, not just functional and space requirements, and the relevant modification(s) of the associated objects has to be verified. So one can manage product lifecycle activities in different perspectives by knowing how the product information is interconnected in various domains and how its characteristics affect each other.

A GA Based Configuration Design Optimization Method

2004 ◽  
Vol 126 (1) ◽  
pp. 6-15 ◽  
Author(s):  
Pierre M. Grignon ◽  
Georges M. Fadel
Keyword(s):  
Design Optimization ◽  
Optimization Method ◽  
System Level ◽  
Configuration Design ◽  
Test Cases ◽  
A Posteriori ◽  
Mechanical Assemblies ◽  
Sharp Edges ◽  
Component Shape ◽  
Definition Of

This work presents a methodology for optimizing multiple system level assembly characteristics of complex mechanical assemblies by placement of their components. It addresses any component shape (including nonconvex, hollow, sharp edges) connected together by functional constraints. This method presents the designer with multiple solutions to the engineering configuration design problem (ECDP) using a Pareto Genetic Algorithm working on a population of sets instead of a population of individual points and thus results in a more informed a posteriori decision on the tradeoff issues between the various objectives. This paper addresses the definition of the assembly components and their relationships (ECDP), the definition of the configuration design optimization method (CDOM), and shows the application of the CDOM to one academic and two engineering test cases.

Minority Presidents in a Coalitional World

2018 ◽  
Author(s):  
Paul Chaisty ◽  
Nic Cheeseman ◽  
Timothy J. Power
Keyword(s):  
Coalition Formation ◽  
Cost Minimization ◽  
Analytical Framework ◽  
System Level ◽  
Current State ◽  
Key Concepts ◽  
Definition Of

This chapter summarizes the main parameters of coalitional presidentialism and the key concepts, definitions, explanatory frameworks, indicators, and propositions. It summarizes our understanding of coalitional presidentialism; the distinction between coalition formation and maintenance; the definition of coalitions; the multidimensional understanding of coalition management (the ‘presidential toolbox’); and an analytical framework that emphasizes the motivation of presidents to achieve cost minimization under constraints determined by system-level, coalition-level, and conjunctural factors. It also summarizes our main empirical findings: (1) the characteristics of presidential tools, (2) the substantive patterns of their deployment, (3) the factors that shape the costs of using these tools, (4) the actual (observed) costs of using them, and (5) the potential for imperfect substitutability of these tools. Finally, it concludes with some reflections on the current state of the research on comparative presidentialism.

Semantic Health Mediation and Access Control Manager for Interoperability Among Healthcare Systems

2018 ◽  
Vol 11 (4) ◽  
pp. 87-98
Author(s):  
Abdullah Alamri
Keyword(s):  
Medical Information ◽  
Clinical Information ◽  
Healthcare Systems ◽  
Patient Data ◽  
Dual Model ◽  
Healthcare Organizations ◽  
Reference Information ◽  
Proposed Model ◽  
Definition Of ◽  
Semantic Mediation

Healthcare systems have evolved to become more patient-centric. Many efforts have been made to transform paper-based patient data to automated medical information by developing electronic healthcare records (EHRs). Several international EHRs standards have been enabling healthcare interoperability and communication among a wide variety of medical centres. It is a dual-model methodology which comprises a reference information model and an archetype model. The archetype is responsible for the definition of clinical concepts which has limitations in terms of supporting complex reasoning and knowledge discovery requirements. The objective of this article is to propose a semantic-mediation architecture to support semantic interoperability among healthcare organizations. It provides an intermediate semantic layer to exploit clinical information based on richer ontological representations to create a “model of meaning” for enabling semantic mediation. The proposed model also provides secure mechanisms to allow interoperable sharing of patient data between healthcare organizations.

Product Model Preparation and Processing for Micromanufacturing

2008 ◽  
Vol 8 (2) ◽  
Author(s):  
Chao-Yaug Liao ◽  
Jean-Claude Léon ◽  
Cédric Masclet ◽  
Michel Bouriau ◽  
Patrice L. Baldeck ◽  
...  
Keyword(s):  
Laser Beam ◽  
Computer Aided Design ◽  
Welding Process ◽  
Product Model ◽  
Processing Scheme ◽  
Proposed Model ◽  
Layer Manufacturing ◽  
Manifold Models ◽  
Model Preparation ◽  
Aided Design

Based on the two-photon polymerization technique, an analysis of product shapes is performed so that their digital manufacturing models can be efficiently processed for micromanufacture. To describe microstructures, this analysis shows that nonmanifold models are of interest. These models can be intuitively understood as combinations of wires, surfaces, and volumes. Minimum acceptable wall thickness, wire dimension, and laser density of energy are among the elements justifying this category of models. Taking into account this requirement, a model preparation and processing scheme is proposed that widens the laser beam trajectories with a concept of extended layer manufacturing technique. A tessellation process suited for non-manifold models has been developed for computer-aided design models imported from standard for the exchange of product files. After tessellation, several polyhedral subdomains form a nonmanifold polyhedron. To plan the trajectories of the laser beam, adaptive slicing and global 3D hatching processes as well as a “welding” process (for joining subdomains of different dimensionality) have been combined. Finally, two nonmanifold microstructures are fabricated according to the proposed model preparation and processing scheme.

Influence of Clearances and Thermal Effects on the Dynamic Behavior of Gear-Hydrodynamic Journal Bearing Systems

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
R. Fargère ◽  
P. Velex
Keyword(s):  
Degrees Of Freedom ◽  
Integration Scheme ◽  
Time Step ◽  
Specific Element ◽  
Normal Contact ◽  
Contact Algorithm ◽  
Gear Teeth ◽  
Proposed Model ◽  
Elastic Couplings ◽  
Definition Of

A global model of mechanical transmissions is introduced which deals with most of the possible interactions between gears, shafts, and hydrodynamic journal bearings. A specific element for wide-faced gears with nonlinear time-varying mesh stiffness and tooth shape deviations is combined with shaft finite elements, whereas the bearing contributions are introduced based on the direct solution of Reynolds' equation. Because of the large bearing clearances, particular attention has been paid to the definition of the degrees-of-freedom and their datum. Solutions are derived by combining a time step integration scheme, a Newton–Raphson method, and a normal contact algorithm in such a way that the contact conditions in the bearings and on the gear teeth are simultaneously dealt with. A series of comparisons with the experimental results obtained on a test rig are given which prove that the proposed model is sound. Finally, a number of results are presented which show that parameters often discarded in global models such as the location of the oil inlet area, the oil temperature in the bearings, the clearance/elastic couplings interactions, etc. can be influential on static and dynamic tooth loading.

The Facets of Cultural Competence

2001 ◽  
Vol 29 (6) ◽  
pp. 842-849 ◽  
Author(s):  
Lisa A. Suzuki ◽  
Mary B. McRae ◽  
Ellen L. Short
Keyword(s):  
Clinical Practice ◽  
Cultural Competence ◽  
Counseling Psychology ◽  
Past Research ◽  
Current Clinical Practice ◽  
Multidimensional Model ◽  
Proposed Model ◽  
Innovative Thinking ◽  
Definition Of

Sue’s proposed model is based on a critique of the Eurocentric assumptions underlying current clinical practice and reflects his innovative thinking and unique synthesis of past research. The specific areas addressed in this article focus on an examination of the multidimensional model of cultural competence (MDCC) and issues related to the definition of competence and its measurement. Areas of needed elaboration in the model include complexities related to power hierarchies (i.e., authority, authorization, and leadership) and implications for training and practice. Particular emphasis is placed on the complexities of cultural competence and the important contributions of Sue’s MDCC as an important step in making cultural competence a reality in the practice of counseling psychology.

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