scholarly journals Enriching Assembly CAD Models With Functional and Mechanical Informations to Ease CAE

2010 ◽  
Author(s):  
Gilles Foucault ◽  
Jean-Claude Le´on
Keyword(s):  
Product Development ◽  
Geometric Constraints ◽  
Geometric Models ◽  
Bill Of Materials ◽  
Starting Point ◽  
Cad Models ◽  
Development Processes ◽  
Mechanical Information ◽  
Standard Components ◽  
Assembly Models

Assembly models can be regarded as a kernel for product development processes where they can efficiently contribute to many product simulation behaviors. Assembly models are often containing 3D B-Rep CAD models, possibly with geometric constraints between the components and bill of materials. However, these models are often difficult to process for simulations because algorithms often face a very large diversity of configurations. One origin of such difficulties can be found in companies’ practice where components may be represented differently from one company to another and their interfaces as well. In any case, interfaces between components are not explicit, which leads to tedious model processing tasks. This paper illustrates preparation of assembly models to ease CAE through an analysis of company practices, showing that a concept of conventional representations is an important starting point to efficient treatments of assemblies. In addition, it is described how interfaces and conventional representations can be combined to derive functional and mechanical information from geometric models of components. Illustrations of the proposed approach is given throughout the paper using various standard components.

User-Driven Computer-Assisted Reverse Engineering of Editable CAD Assembly Models

2021 ◽  
pp. 1-16
Author(s):  
Ghazanfar Ali Shah ◽  
Jean-Philippe Pernot ◽  
Arnaud Polette ◽  
Franca Giannini ◽  
Marina Monti
Keyword(s):  
Reverse Engineering ◽  
Point Cloud ◽  
Point Clouds ◽  
Geometric Constraints ◽  
Computer Assisted ◽  
Reconstruction Process ◽  
Mechanical Parts ◽  
Starting Point ◽  
Cad Models ◽  
Incomplete Datasets

Abstract This paper introduces a novel reverse engineering technique for the reconstruction of editable CAD models of mechanical parts' assemblies. The input is a point cloud of a mechanical parts' assembly that has been acquired as a whole, i.e. without disassembling it prior to its digitization. The proposed framework allows for the reconstruction of the parametric CAD assembly model through a multi-step reconstruction and fitting approach. It is modular and it supports various exploitation scenarios depending on the available data and starting point. It also handles incomplete datasets. The reconstruction process starts from roughly sketched and parameterized geometries (i.e 2D sketches, 3D parts or assemblies) that are then used as input of a simulated annealing-based fitting algorithm, which minimizes the deviation between the point cloud and the reconstructed geometries. The coherence of the CAD models is maintained by a CAD modeler that performs the updates and satisfies the geometric constraints as the fitting process goes on. The optimization process leverages a two-level filtering technique able to capture and manage the boundaries of the geometries inside the overall point cloud in order to allow for local fitting and interfaces detection. It is a user-driven approach where the user decides what are the most suitable steps and sequence to operate. It has been tested and validated on both real scanned point clouds and as-scanned virtually generated point clouds incorporating several artifacts that would appear with real acquisition devices.

Topology-Oriented Deformation of FE-Meshes in Iterative Reverse Engineering Processes

2012 ◽  
Author(s):  
Matthias Klaus ◽  
Stefan Holtzhausen ◽  
Christine Schöne ◽  
Ralph Stelzer
Keyword(s):  
Finite Element ◽  
Product Development ◽  
Reverse Engineering ◽  
Optimum Result ◽  
Research Activities ◽  
Cad Models ◽  
Development Processes ◽  
Material Element ◽  
Scan Data ◽  
Finite Element Meshing

Reverse Engineering methods are becoming more and more important in product development processes in cases without CAD models or modified physical objects. For numerical calculations of scanned components, using, for instance, the Finite Element Method (FEM) to look at strength or vibration characteristics, we need the previously scanned data, obtained via Geometric Reverse Engineering, to be converted into CAD surface data, a Finite Element-meshing and a determination of material parameters and constraints. Tremendous effort must be expended in the course of performing repeated Geometric Reverse Engineering and FE-meshing, which must be done when there are iterative, largely local changes in real geometry (such as when incorporating forming dies) or in the case of topologically similar objects, which must be scanned again and again. This project is aimed at the generation of new calculation models using an appropriate adaption of existing FE meshes (made using a CAD model, for example) or FE meshes previously created with the help of scan data through the retention of intelligent meshing (constraints, material, element type etc.). In terms of their topology, these new meshes should adapt themselves to changes in geometry. Time-consuming Geometric Reverse Engineering, as well as re-meshing, can thus be bypassed. Product development cycles frequently proceed in an iterative manner. Repetition of process steps is intended to improve the product in order to achieve an optimum result in design and dimensioning. The goal of these research activities is to reduce the process steps from 3D scan data to FE-meshing, in particular in development cycles. The paper introduces the project’s concept, its initial results, and further steps.

Product Modeling, Evaluation and Validation at the Detailed Design Stage

2011 ◽  
Author(s):  
Cristian Iorga ◽  
Alain Desrochers
Keyword(s):  
Product Development ◽  
Design Process ◽  
Design Stage ◽  
Product Modeling ◽  
Specific Product ◽  
Development Processes ◽  
Product Variation ◽  
Process Methodology ◽  
Capstone Projects ◽  
Short Time

The expansion of the markets corroborated with product customization and short time to launch the product have led to new levels of competition among product development companies. To be successful in the globalization of the markets and to enable the evaluation and validation of products, companies have to develop methodologies focused on lifecycle analysis and reduction of product variation to obtain both quality and robustness of products. Keywords: Modeling, Evaluation, Validation, Design ProcessThis paper proposes a new design process methodology that unifies theoretical results of modeling stage and empirical findings obtained from the validation stage. The evaluations and validations of engineering design are very important and they have a high influence on product performances and their functionality, as well on the customer perceptions.Given that most companies maintain the confidentiality of their product development processes and that the existing literature does not provide more detailed aspects of this field, the proposed methodology will represent a technical and logistical support intended for students or engineers involved in academic as well as industrial projects.A generic methodology will be refined based on a new approach that will take into consideration the specification types (quantitative or qualitative), the design objectives and the product types: new/improved, structural/esthetic. Hence the new generic methodology will be composed of specific product validation algorithms taking into account the above considerations. At the end of this paper, the improvements provided by the proposed methodology into the design process will be shown in the context of the engineering student capstone projects at the Université de Sherbrooke.

scholarly journals A CONTROL LIST FOR THE SYSTEMATIC IDENTIFICATION OF DISTURBANCE FACTORS

2021 ◽  
Vol 1 ◽  
pp. 51-60
Author(s):  
Peter Welzbacher ◽  
Gunnar Vorwerk-Handing ◽  
Eckhard Kirchner
Keyword(s):  
Literature Review ◽  
Product Development ◽  
Model Theory ◽  
Development Process ◽  
Product Development Process ◽  
Key Factors ◽  
Starting Point ◽  
Disturbance Factor ◽  
Systematic Identification

AbstractThe importance of considering disturbance factors in the product development process is often emphasized as one of the key factors to a functional and secure product. However, there is only a small number of tools to support the developer in the identification of disturbance factors and none of them yet ensures that the majority of occurring disturbance factors is considered. Thus, it is the aim of this contribution to provide a tool in form of a control list for the systematic identification of disturbance factors. At the beginning of this contribution, the terms “disturbance factor” and “uncertainty” are defined based on a literature review and different approaches for the classification of uncertainty are presented. Subsequently, the fundamentals of multipole based model theory are outlined. Moreover, a first approach in terms of a control list for a systematic identification of disturbance factors is discussed. Based on the discussed approach and taking the identified weaknesses as a starting point, a control list is presented that combines the existing basic concept of the control list with the fundamentals of multipole based model theory.

PRODUCT DEVELOPMENT IN OPEN DESIGN COMMUNITIES: A PROCESS PERSPECTIVE

2011 ◽  
Vol 08 (04) ◽  
pp. 557-575 ◽  
Author(s):  
CHRISTINA RAASCH
Keyword(s):  
Product Development ◽  
Open Source ◽  
Low Cost ◽  
Industrial Practice ◽  
Open Design ◽  
Open Development ◽  
Development Processes ◽  
Design Projects ◽  
Process Perspective ◽  
Significant Attention

Open source (OS) has raised significant attention in industrial practice and in scholarly research as a new and successful mode of product development. This paper is among the first to study open source development processes outside their original context, the software industry. In particular, we investigate the development of tangible products in so-called open design projects. We study how open design projects address the challenges usually put forward in the literature as barriers to the open development of tangible products. The analysis rests on the comparative qualitative investigation of four cases from different industries. We find that, subject to certain contingencies, open design processes can be organized to resemble OSS development processes to a considerable degree. Some practices are established specifically to uphold OS principles in the open design context, while others starkly differ from those found in OSS development. Our discussion focusses on different aspects of modularity as well as the availability of low-cost tools.

Coordination of Complex Product Development Processes

2010 ◽  
Author(s):  
Samuel Suss ◽  
Vincent Thomson
Keyword(s):  
Product Development ◽  
Product Development Process ◽  
Complex Products ◽  
Complex Processes ◽  
The Status ◽  
Development Processes ◽  
Correct Understanding ◽  
Vital Element ◽  
Insight Into ◽  
Product Development Processes

Product development processes of complex products are complex themselves and particularly difficult to plan and manage effectively. Although many organizations manage their product development processes by monitoring the status of documents that are created as deliverables, in fact the progress of the process is in large part based on the actual information flow which is required to develop the product and produce the documents. A vital element in making product development processes work well is the correct understanding of how information flows and how to facilitate its development. In this paper we describe an executable stochastic model of the product development process that incorporates the salient features of the interplay between the information development, exchange and progress of the technical work. Experiments with the model provide insight into the mechanisms that drive these complex processes.

A Simple Starting Point for Designing for and/or Assessing the Social Impact of Products

2017 ◽  
Author(s):  
Hans Ottosson ◽  
Emma Hirschi ◽  
Christopher A. Mattson ◽  
Eric Dahlin
Keyword(s):  
Product Development ◽  
Social Impact ◽  
Development Process ◽  
Social Impacts ◽  
Product Development Process ◽  
Impact Categories ◽  
Functional Characteristics ◽  
Starting Point ◽  
The Social ◽  
The Impact

In this paper we present a starting point for designing for and/or assessing the social impact of engineered products. The starting point is a set of tables comprising products, their general functional characteristics, and the accompanying social impacts. We have constructed these tables by first extracting a set of social impact categories from the literature, then 65 products were qualitatively reviewed to find their social impact. The resulting product impact tables can be used at either the beginning of the product development process to decide what social impact to design for and discover product functions that lead to it, or later to qualitatively assess the social impact of a product being designed and/or to assess the impact of an existing product.

Development of Food Packaging through TRIZ and the Possibility of Open Innovation

2021 ◽  
Vol 7 (4) ◽  
pp. 213
Author(s):  
Harry Jeong ◽  
Seunggu Lee ◽  
Kwangsoo Shin
Keyword(s):  
Product Development ◽  
Elderly People ◽  
New Product Development ◽  
Consumer Research ◽  
Open Innovation ◽  
Food Packaging ◽  
Universal Design ◽  
New Product ◽  
Improvement Plan ◽  
Starting Point

As the aging population increases, the need for new product development (NPD) for elderly-friendly food packaging is also increasing. Through the use of consumer research, this study derived the following problems when elderly people use food packaging: “The contents easily overflow when holding the container”, “It is hard to pour”, “Remnant remains after pouring”, and “It is hard to use a straw”. To address these problems, this study applied the following principles of TRIZ: principle 1 (segmentation) and principle 22 (blessing in disguise). In order to materialize the improvement plan, this study developed an elderly-friendly pouch-based packaging from the perspective of universal design. This study shows that it is possible to use the TRIZ technique in the NPD of food packaging, and that it is possible to secure commercial competitiveness from the view of universal design. This study is expected to serve as a starting point for further study on the NPD of elderly-friendly food packaging.

scholarly journals Aproximación metodológica al análisis de contenidos a partir del discurso de los actores. Un ensayo de investigación social de procesos de desarrollo local (Loja, Ecuador)

2018 ◽  
Author(s):  
Diana Mendieta Vicuña ◽  
Javier Esparcia Pérez
Keyword(s):  
Content Analysis ◽  
Wind Farm ◽  
Social Economic ◽  
Local Development ◽  
Methodological Approach ◽  
Stakeholder Analysis ◽  
The Core ◽  
Starting Point ◽  
Development Processes ◽  
Institutional Actors

El análisis de contenidos está en el centro de gran cantidad de estudios de investigación social. Por su parte, el análisis del sistema de actores también ha sido ampliamente explotado en el estudio de procesos de desarrollo local, bajo diferentes aproximaciones. Sin embargo, este trabajo tiene como objetivo mostrar algunas de las potencialidades y ventajas del análisis de contenidos a partir del discurso de los actores implicados en procesos de desarrollo local. Para ello, se toma como punto de partida la información primaria obtenida de las entrevistas semiestructuradas realizadas a una muestra de actores sociales, económicos e institucionales vinculados a la puesta en marcha de la central eólica Villonaco (Loja, Ecuador). Según el gobierno ecuatoriano, esta ha de tener una clara proyección en el desarrollo local, y de ahí el interés por analizar estos procesos desde esta perspectiva metodológica. Para mostrar las potencialidades del análisis de contenidos a partir del discurso de los actores se utiliza el software MAXQDA, que permite, tras la codificación de la información, analizar los diferentes temas y subtemas que definen las posiciones y valoraciones de los actores implicados.The content analysis is at the core of a large number of social studies. On the other hand, the stakeholder analysis has been widely used in the study of local development processes from different approaches. However, this paper aims to show the potential and advantages of content analysis based on the actors’ discourse involved in local development processes. Primary information obtained from interviews conducted with a sample of social, economic and institutional actors linked to the starting up and operation of Villonaco Wind Farm (Loja, Ecuador), has been taken as a starting point. According to the Ecuadorian government, this wind farm should have a clear projection in local development, hence the interest in the analysis of these processes using this methodological approach. Software MAXQDA is used to show the potential of content analysis. This tool allows, after the encoding process of information, to analyze the various topics and subtopics that define the positions adopted by the actors and their appraisals of the studied processes.

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