Design for Assembly Evaluation of Orientation Difficulty Features

18th Design Automation Conference: Volume 1 — Optimum Design, Manufacturing Processes, and Concurrent Engineering ◽

10.1115/detc1992-0105 ◽

1992 ◽

Author(s):

Robert H. Sturges ◽

Jui-Te Yang

Keyword(s):

Geometric Modeling ◽

Boundary Representation ◽

Design For Assembly ◽

Assembly Process ◽

Assembly Evaluation ◽

Index Of Difficulty ◽

Analysis System ◽

Time Required ◽

High Level ◽

Geometric Modeling System

Abstract In support of the effort to bring downstream issues to the attention of the designer as parts take shape, an analysis system is being built to extract certain features relevant to the assembly process, such as the dimension, shape, and symmetry of an object. These features can be applied to a model during the downstream process to evaluate handling and assemblability. In this paper, we will focus on the acquisition phase of the assembly process and employ a Design for Assembly (DFA) evaluation to quantify factors in this process. The capabilities of a non-homogeneous, non-manifold boundary representation geometric modeling system are used with an Index of Difficulty (ID) that represents the dexterity and time required to assemble a product. A series of algorithms based on the high-level abstractions of loop and link are developed to extract features that are difficult to orient, which is one of the DFA criteria. Examples for testing the robustness of the algorithms are given. Problems related to nearly symmetric outlines are also discussed.

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Alchemy: Distributed financial quantitative analysis system with high‐level programming model

Software Practice and Experience ◽

10.1002/spe.2982 ◽

2021 ◽

Author(s):

Rong Gu ◽

Zhixiang Zhang ◽

Zhihao Xu ◽

Zhaokang Wang ◽

Kai Zhang ◽

...

Keyword(s):

Quantitative Analysis ◽

Programming Model ◽

Analysis System ◽

High Level

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Hardware and Software Implementation of Constructive Geometric Models

Proceedings of the 30th International Conference on Computer Graphics and Machine Vision (GraphiCon 2020). Part 1 ◽

10.51130/graphicon-2020-1-83-98 ◽

2020 ◽

pp. 83-98

Author(s):

Denis Voloshinov ◽

Konstantin Solomonov

Keyword(s):

Computer Technology ◽

Geometric Modeling ◽

Software Implementation ◽

Theoretical Research ◽

Graphical Interface ◽

Calculation Methods ◽

Geometric Transformations ◽

Geometric Models ◽

Long Time ◽

Geometric Modeling System

The article is devoted to the consideration of a number of issues of hardware and software implementation of constructive geometric models. A rich arsenal of theoretical research in the field of constructive geometry has not been properly used for a long time due to the lack of tools for translating such models using computer technology. The development and improvement of the Simplex geometric modeling system, in which any geometric design is considered as a converter of information represented by signals of a geometric nature, has opened the possibility of applying the achievements of geometric science in computing applications, as well as the development of hardware that implements geometric calculation methods and provides a new graphical interface. The concept developed by the authors is aimed at creating specialized accelerators of geometric transformations.

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Crankshaft Stress Analysis—Combination of Finite Element and Classical Analysis Techniques

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2906491 ◽

1990 ◽

Vol 112 (3) ◽

pp. 268-275 ◽

Cited By ~ 19

Author(s):

A. R. Heath ◽

P. M. McNamara

Keyword(s):

Stress Analysis ◽

Concept Design ◽

Low Friction ◽

Failure Investigation ◽

Engine Design ◽

Computer Based ◽

Analysis System ◽

High Level ◽

Engine Components ◽

Oil Films

The conflicting legislative and customer pressures on engine design, for example, combining low friction and a high level of refinement, require sophisticated tools if competitive designs are to be realized. This is particularly true of crankshafts, probably the most analyzed of all engine components. This paper describes the hierarchy of methods used for crankshaft stress analysis with case studies. A computer-based analysis system is described that combines FE and classical methods to allow optimized designs to be produced efficiently. At the lowest level simplified classical techniques are integrated into the CAD-based design process. These methods give the rapid feedback necessary to perform concept design iterations. Various levels of FE analysis are available to carry out more detailed analyses of the crankshaft. The FE studies may feed information to or take information from the classical methods. At the highest level a method for including the load sharing effects of the flexible crankshaft within a flexible block interconnected by nonlinear oil films is described. This method includes the FE modeling of the complete crankshaft and the consideration of its stress field throughout an engine cycle. Fatigue assessment is performed to calculate the distribution of fatigue safety factor on the surface of the crankshaft. This level of analysis can be used for failure investigation, or detailed design optimization and verification. The method is compatible with those used for vibration and oil film analysis.

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Assembly process visualization in feature‐based design for assembly

International Journal of Agile Management Systems ◽

10.1108/14654659910296562 ◽

1999 ◽

Vol 1 (3) ◽

pp. 177-189 ◽

Cited By ~ 5

Author(s):

Wen‐Chieh Chuang ◽

Peter O’Grady

Keyword(s):

Design For Assembly ◽

Assembly Process ◽

Process Visualization ◽

Feature Based ◽

Feature Based Design

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Towards Dynamic Tolerance Analysis Using Bond Graphs

Volume 2: 24th Design Automation Conference ◽

10.1115/detc98/dac-5631 ◽

1998 ◽

Author(s):

Otto W. Salomons ◽

Johan Zijlstra ◽

Johnny A. van der Zwaag ◽

Fred J. A. M. van Houten

Keyword(s):

Dynamic Behavior ◽

Robust Design ◽

Physical Modeling ◽

Geometric Modeling ◽

Tolerance Analysis ◽

Simulation System ◽

Computer Support ◽

Bond Graphs ◽

Physical Effects ◽

Geometric Modeling System

Abstract A generic method is proposed by which the effect of tolerances in combination with physical effects such as wear can be analysed on the dynamic behavior of mechanisms. The method uses bond graphs in order to simulate the dynamic behavior under the influence of tolerances and other physical effects. The method has the potential to offer enhanced computer support in tolerance value specification as well as in robust design and model based maintenance. The method has partly been implemented using a combination of a geometric modeling system (FROOM) and a bond graph based physical modeling and simulation system (20-Sim).

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Concurrent Robust Product and Process Design

Volume 1: 25th Design Automation Conference ◽

10.1115/detc99/dac-8687 ◽

1999 ◽

Author(s):

Lars Lindkvist ◽

Rikard Söderberg

Keyword(s):

Process Design ◽

Evaluation Criteria ◽

Software Tool ◽

The Body ◽

Assembly Process ◽

Critical Dimensions ◽

Cad System ◽

Start Up ◽

Assembly Evaluation ◽

Product And Process

Abstract This paper presents a method for assembly evaluation. The method uses two evaluation criteria, robustness and variation analysis, and is supported by a software tool developed by the authors. The robustness evaluation aims at detecting design and assembly solutions that are sensitive to variation and may cause problems during production. Using this method in early product and process design phases helps to find more robust concepts, resulting in shorter production start-up time and better precision. The method’s use is exemplified in a concept study of the assembly process of the door to the body of a (fictitious) jeep. The study shows that the proposed method can be used to obtain an objective comparison between different concepts. This comparison includes both general robustness and the expected variation in the critical dimensions. The results can be used, together with economical and practical aspects, to determine which concept is best suited for the assembly process. The software used is implemented in the MS Windows environment and has an JGES interface that enables the user to import CAD geometry from an arbitrary CAD system. It can perform different types of robustness evaluations as well as traditional variation analyses.

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Parametric Generator for Architectural and Urban 3D Objects

Complexity Science, Living Systems, and Reflexing Interfaces ◽

10.4018/978-1-4666-2077-3.ch013 ◽

2013 ◽

pp. 260-267

Author(s):

Renato Saleri Lunazzi

Keyword(s):

Finite Elements ◽

Conceptual Model ◽

Geometric Modeling ◽

General Purpose ◽

Semantic Description ◽

3D Objects ◽

Future Developments ◽

Simple Tool ◽

Parametric Generator ◽

High Level

The authors developed and finalized a specific tool able to model the global structure of architectural objects through a morphological and semantic description of its finite elements. This discrete conceptual model - still in study - was refined during the geometric modeling of the “Vieux Lyon” district, containing a high level of morpho-stylistic disparity. Future developments should allow increasing the genericity of its descriptive efficiency, permitting even more sparse morphological and\or stylistic varieties. Its general purpose doesn’t consist in creating a “universal modeler,” but to offer a simple tool able to quickly describe a majority of standard architectural objects compliant with some standard parametric definition rules.

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An Empirical Investigation on System and Statement Level Parallelism Strategies for Accelerating Scatter Search Using Handel-C and Impulse-C

VLSI Design ◽

10.1155/2012/793196 ◽

2012 ◽

Vol 2012 ◽

pp. 1-11

Author(s):

M. Walton ◽

O. Ahmed ◽

G. Grewal ◽

S. Areibi

Keyword(s):

Optimization Problems ◽

Scatter Search ◽

Population Based ◽

Field Programmable ◽

Speed Up ◽

Time Required ◽

High Level ◽

Level Parallelism ◽

Code Optimizations ◽

Established Population

Scatter Search is an effective and established population-based metaheuristic that has been used to solve a variety of hard optimization problems. However, the time required to find high-quality solutions can become prohibitive as problem sizes grow. In this paper, we present a hardware implementation of Scatter Search on a field-programmable gate array (FPGA). Our objective is to improve the run time of Scatter Search by exploiting the potentially massive performance benefits that are available through the native parallelism in hardware. When implementing Scatter Search we employ two different high-level languages (HLLs): Handel-C and Impulse-C. Our empirical results show that by effectively exploiting source-code optimizations, data parallelism, and pipelining, a 28x speed up over software can be achieved.

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