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Dive into the research topics where Alain Desrochers is active.

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Featured researches published by Alain Desrochers.


The International Journal of Advanced Manufacturing Technology | 1997

A matrix approach to the representation of tolerance zones and clearances

Alain Desrochers; Alain Riviere

This paper presents a matrix approach coupled to the notion of constraints for the representation of tolerance zones within CAD/CAM (computer-aided design and manufacture) systems. The proposed theory, reproduces themeasurable ornon-invariant displacements associated with various types of tolerance zone. This is done using the homogeneous transforms commonly associated with robotic modelling.This matrix representation is completed by a set of inequalities defining the bounds of the tolerance zones. Moreover, the generation of the model and its mathematical definition allows for its use in the representation of clearances and for the computation of tolerance transfer. An example illustrates the application of the model to a simplified gear pump mechanism.


The International Journal of Advanced Manufacturing Technology | 1994

A dimensioning and tolerancing assistance model for CAD/CAM systems

Alain Desrochers; Andre Clement

A model called TTRS for technologically and topologically related surfaces, has been developed and its application to dimensioning and tolerancing is presented here. According to this model, any part can be represented as a succession of binary surfaces associations forming a tree. Additionally, each surfaces association, termed as a TTRS object, is represented by a set of minimum geometric datum elements (MGDE). Once established, each TTRS can be given appropriate geometric dimensioning and tolerancing (GD & T) symbols through a general procedure making use of GD & T tables and combination rules. Application examples are also presented.


Journal of Computing and Information Science in Engineering | 2006

A Product Feature Evolution Validation Model for Engineering Change Management

Nadjib Bouikni; Alain Desrochers; Louis Rivest

Product design integrates several disciplines in a concurrent engineering (CE) environment. Each one of these disciplines has a specific point of view on the product being developed. While each discipline exerts its own expertise and methods on the definition of the product and its related processes, information must remain consistent for all disciplines and through the evolution of the product definition. This paper proposes a product feature evolution validation (PFEV) model that aims at controlling the information flow needed to support a product definition evolution (PDE) while insuring its validation by all disciplines involved. The model applies both to the product design and modification phases, i.e., before and after releasing its definition. The PFEV model thus supports CE and enables managing the product feature evolution throughout the product life cycle. The PFEV model defines an exchange protocol between the disciplines in order to preserve the consistency of the numerical model, which includes the complete numerical information characterizing the product. The model addresses two qualities of an information system: dispatching relevant PDE information to appropriate disciplines and providing this information according to specific views. This is achieved by centralizing the product numerical model and by exploiting the product’s features rather than managing product model as black boxes. Links between features are formalized in a shared product features table that is used to dynamically identify all disciplines impacted by a product feature evolution (PFE). A PFE is also characterized by its potential impact, detrimental or beneficial, on every discipline previously identified as impacted. In the case of a detrimental impact, the discipline is asked to validate the evolution. If the impact is beneficial, the discipline is simply notified about the evolution. Specific views are generated for the impacted disciplines based on feature filtering and adaptation mechanisms.


Archive | 1996

Constrained dimensioning and tolerancing assistance for mechanisms

Alain Desrochers; Roland Maranzana

This paper presents a systematic approach for dimensioning and tolerancing mechanisms. The method is based on a model of Technologically and Topologically Related Surfaces (TTRS) and uses a binding graph representation of the mechanism. The complete dimensioning and tolerancing of each part is generated by recursively associating surfaces along kinematic loops on the graph. Technological requirements and user constrains are integrated in the system through specific choices of kinematic loops and partial references (Minimum Geometric Datum Element). The system developped insures that the geometric dimensioning and tolerancing be complete and non redundant while conforming to ANSI Y14.5M or ISO standards


international conference on robotics and automation | 2001

Machine vision system for the automatic identification of robot kinematic parameters

Patrick Rousseau; Alain Desrochers; Nicholas Krouglicof

This paper presents an efficient, noncontact measurement technique for the automatic identification of the real kinematic parameters of an industrial robot. The technique is based on least-squares analysis and on the Hayati and Mirmirani kinematic modeling convention for closed kinematic chains. The measurement system consists of a single camera mounted on the robots wrist. The camera measures position and orientation of a passive target in six degrees of freedom. Target position is evaluated by applying least-squares analysis on an overdetermined system of equations based on the quaternion representation of the finite rotation formula. To enhance the accuracy of the measurement, a variety of image processing functions including subpixel interpolation are applied.


Archive | 1998

Determination of part position uncertainty within mechanical assembly using screw parameters

Alain Desrochers; Olivier Delbart

The methodology employs a TTRS (Technologically and Topologically Related Surfaces) structure and consists of three stages : The user starts by constructing the TTRS structure in relation to the geometry and tolerancing that he wants to apply to a given mechanism. Using screw parameters associated with TTRS it is then possible to generate equations known as laws of behavior. The user then specifies the inequalities that represent either the constraints imposed by tolerancing or the specifications of the functional clearance. The final stage is optimization, which makes it possible to determine the least favorable configurations using this series of equations and inequalities. Since several studies have already clearly defined the construction of TTRS structures [DES 91], this will not be explained again here in detail. The focus of this study is the generation of equations and inequalities.


Archive | 1999

A three dimensional tolerance transfer methodology

Alain Desrochers; Sander Verheul

This paper presents the adaptation of tolerance transfer techniques to a model called TTRS for Technologically and Topologically Related Surfaces. According to this model, design and process plan specifications can both be represented as a succession of surface associations on a combined representation tree. This tree can be enriched by the addition of technological attributes such as dimensional and geometrical tolerances. This provides the basis of a proper framework for the computation of tolerance transfer. Rules are indeed established to simulate tolerance chains or stack up which are generated according to paths or loops on the TTRS tree. Sets of equations are therefore generated and solved for each of these loop.


Journal of Computing and Information Science in Engineering | 2003

Application of a Unified Jacobian—Torsor Model for Tolerance Analysis

Alain Desrochers; Walid Ghie; Luc Laperrière


Archive | 1993

Tolerance modeling for 3D analysis – presenting a kinematic formulation

Louis Rivest; Clément Fortin; Alain Desrochers


Journal of Computing and Information Science in Engineering | 2003

Special Issue on Computing Technologies to Support Geometric Dimensioning & Tolerancing (GD&T)

Alain Desrochers; C.-H. Menq; Bob Wilhelm

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Louis Rivest

École de technologie supérieure

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Roland Maranzana

École de technologie supérieure

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Nicholas Krouglicof

Memorial University of Newfoundland

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Frédérick Venne

École de technologie supérieure

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Nadjib Bouikni

École de technologie supérieure

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Clément Fortin

École Polytechnique de Montréal

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F. Giguère

Université de Sherbrooke

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Sander Verheul

École de technologie supérieure

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Walid Ghie

Université du Québec en Abitibi-Témiscamingue

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