Sébastien Remy

From a 3D point cloud to an engineering CAD model: a knowledge-product-based approach for reverse engineering

Reverse engineering (RE) is an area of current interest in which physical models are measured or digitised to obtain a virtual model. Currently, geometric models are rebuilt using geometric approaches. These models are generally frozen (i.e. not parameterisable and not easy to modify). This paper deals with a new knowledge-based approach for reverse engineering that enables nonfrozen computer-aided design (CAD) models. According to the product knowledge, we propose to assist CAD software application user to build the tree structure of the product. The proposed approach aims to obtain an engineering CAD model by merging existing geometric approach and the tree structure of the product.

3D Digitizing Strategy Planning Approach Based on a CAD Model

The objective of this paper is to describe a new method to determine the three-dimensional (3D) digitizing strategy for a computer aided design (CAD) known mechanical part by using a plane laser sensor. The Research Centre for Automatic control in Nancy, France has initiated a project to create an automatic 3D digitizing system. Previous papers focused on the visibility determinations using spherical geometry in a three axis environment. Here, the latest developments are presented. They enable one to improve this approach by taking into account a five axis environment. Using a new approach based on the Minkovsky operations to calculate the visibility of the different face of the B-Rep model of the part, the minimum set of directions required to entirely digitize the part is computed.

Knowledge Based Reverse Engineering—An Approach for Reverse Engineering of a Mechanical Part

Reverse engineering (RE) is a domain of current interest where physical models are measured or digitized in order to obtain a virtual model. Currently, these virtual models are rebuilt using approaches that consider only a geometric point of view. These models are generally frozen (i.e., poorly parameterized and not easy to modify). These kinds of models are good for many applications but people need more for redesign operations. This paper proposes a knowledge-based approach for reverse engineering that enables a RE user to rebuild nonfrozen models that are close to an original CAD model. [.

CAD based model of ultrasonic shot peening for complex industrial parts

This paper presents a numerical model developed specifically for ultrasonic shot peening (USP). It allows simulating the shot dynamics (trajectories in the chamber and impacts on the peened sample) in industrial configurations. The model supports complex 3D geometries, rotating parts and employs efficient collision detection algorithms for short computation times. The aim is to improve peening chamber designs and the choice of process parameters. The algorithm and main assumptions are presented. Numerical studies are then conducted to determine the performances of the model, in terms of computation time. Finally, a case study on a spur gear tests the model in an industrial configuration and shows a high correlation between the numerical results and experimental data.

A Product Model to Capture and Reuse Ecodesign Knowledge

Ecodesign is the improvement of the environmental performance of products or services throughout their whole lifecycle. Because there is less design freedom in the late stages of the design process, it is assumed that if the environmental constraint is introduced early, the designers would develop a product that would have a better environmental performance. Thus, case-based reasoning is proposed as a strategy to incorporate ecodesign early in the design process.

A Reverse Engineering Method for DMU Maturity Management: Use of a Functional Reeb Graph

In a development process, Digital Mock-Up (DMU) is the referential view of the developed product, all along the product states (“as-design”, “as-manufactured”, etc.). In case of long lifetime products, such as boats or planes, each released product has its own DMU. During the use, maintenance operations are made. Some of the modifications are made “on field” and are not always reported to the DMU which is no longer mature. The product lifecycle is impacted and not efficient anymore. This paper focuses on a systematized methodology for checking the maturity level of a DMU by confronting it to the real product it is intended to represent. DMU inconsistencies correspond to unreported product components modifications. The first step of the process is a global comparison between the DMU and a digitization of the in-use product using the Reeb graph. The used comparison criterion is the topology. The second step is to identify the kept DMU components in the digitized dataset and thus deduce inconsistencies. That step implies a new shape descriptor combining topological and functional descriptions of a mechanical part: the Functional Reeb Graph.

PHENIX: product history-based reverse engineering

Reverse engineering (RE) is an activity which consists in digitising a real part in order to create a CAD model. Today, a lot of references are centred on geometrical approaches based on transformations of the point cloud. The issued CAD models are generally ‘frozen’ or barely re-usable. Nevertheless, to support engineering changes in a new design process, the product should be represented with a parametric geometry. This paper suggests a knowledge-based approach in order to provide a product’s parametric CAD model. A data model based on the extension of the core product model (CPM) is suggested and enables to manage multi-CAD models of the knowledge-based RE process.

Facet-based approach for the management of information multi points-of- view in product modelling

This paper presents a novel approach describing a framework that supports information representation and management along the product lifecycle. The aim is to provide a conceptual basis to build a multi-representation manager model which is useful for handling information sharing and interaction between experts from various domains, during the collaborative design project. The framework is based on the concept of facet that represents an elementary knowledge fragment of the product, as a combination of different information sources that are: product definition, business information, systems decomposition, and a temporal scale represented by the product lifecycle. The use of the facet concept for the integration of different points-of-view is described from a data modelling perspective.

On the Potential of Design Rationale for Ecodesign

Ecodesign tools have limited performance, mainly for helping designers in early-design. Design rationale has been explored in many domains, but not yet in ecodesign. The result of a first investigation on design rationale of environmental impacts is presented. The objective is to track the design rationale of the design process and to relate these choices to the environmental impacts of the product, in order to conclude about the usefulness of DR to a redesign. A simple case study done with engineering students is commented.

Reverse Engineering of a Piston Using Knowledge Based Reverse Engineering Approach

This paper focuses on Reverse Engineering (RE) in mechanical design. RE is an activity which consists in creating a full CAD model from a 3D point cloud. The aim of RE is to enable an activity of redesign in order to improve, repair or update a given mechanical part. Nowadays, CAD models obtained using modern software applications are generally “frozen” because they are sets of triangles of free form surfaces. In such models, there are not functional parameters but only geometric parameters. This paper proposes the KBRE (Knowledge Based Reverse Engineering) methodology which allows managing and fitting manufacturing and/or functional features. In this paper, specific geometric algorithms are described. They allow extracting design intents in a point cloud in order to fit these features.