Gabriel Ris

Aeronautical Planar Flank Milling Automation: Computing the G-Zones

Flank milling process is commonly applied in the aeronautical industry. It consists of manufacturing mechanical parts using the side of a machinning tool. This process is relevant to be less time consuming as it delivers better surface quality. However, flank milling can only be applied on ruled surfaces. In this article, we cover flank milling application on planar surfaces, a particular ruled surface type. In recent works we presented how to extract planar surfaces milling directions by using expertise provided through our industrial application. We take this study further, where we propose a validation for the proposed milling directions. This validation requires at first a translation of the problem from 3D to 2D. Then, by applying several proposed algorithms we extract for each direction its L-Zone. An L-Zone is the term we use to identify the unmachined part area using a particular milling direction. By intersecting the different L-Zones we obtain the G-Zone that consists of the total unmachined area. Computing the G-Zone for each planar surface indicates the ability of this surface to be flank milled. The proposed study is part of an effort to automate process planning of aeronautical parts. Automating this particular trade can result in a critical reduction of time, effort and costs in aeronautical industries, mainly due to having small production batch.Copyright

Tracking design dependencies to support conflict management

Due to the multi-actors interaction during collaborative design, conflicts can be revealed from disagreements between designers about proposed designs. A critical element of collaborative design would be conflict resolution. This paper proposes a methodology to support designers during the process of conflict management; focusing mainly on identifying the conflict resolution team and evaluating the selected solution impact issues. The methodology is based on product data dependencies network which is composed of the handled data and the dependency links between them. Qualification concepts are introduced to manage these dependencies. In order to identify this network, a traceability model to track the design process is proposed.

Fuzzy logic applied to suface modeling from point clouds

The aim of this project was to propose an original approach c to predetermine the topology of a surface from the point cloud obtained during a digitizing process. This method has been applied for the predefinition of the different main regions of a surface, in order to be able to divide the point cloud in different separate clouds corresponding to these regions. It should be also possible to optimize locally the surface when taking into account tangency and curvature conditions. The main advantage of this method is that, for a given accuracy, the complexity of the surface is lower than a traditional method, an the computations are quite the same than those obtained when using traditional surface modeling algorithms. This method allows a qualitative decomposition of the surface defined from a function z equals f(x,y). In the paper, the fuzzification and defuzzification process and a study of the influence of the main parameters will also be presented. Some fuzzy logic algorithms and functions have been compared and analyzed when applied on the example.

DESIGN IN COLLABORATION: EXISTING TRENDS AND APPLICATION TO THE CASE OF CONFLICT HANDLING WITH CO2MED SOFTWARE

Abstract New Organizational frameworks for companies dealing with product development are required for the new market rules as much as for the rising pressure and complexity in product and process development. Thus, the new stake is to examine new methods of leading the design activities. We examine tools and trends existing in collaborative design today and propose a repository and its software implementation for the most constrained case of collaboration in design: collaborative conflict handling.

Definition of the fundamentals for the automatic generation of digitalization processes with a 3D laser sensor

This paper introduces the first results of a research work carried out on the automation of digitizing process of complex part using a precision 3D laser senor. Indeed, most of the operations are generally still manual to perform digitization. In fact, redundancies, lacks or forgettings in point acquisition are possible. Moreover, digitalization time of a part, i.e. immobilization of the machine, is thus not optimized overall. After introducing the context in which evolves the reverse engineering, we quickly present non-contact sensors and machines usable to digitalize a part. Considered environment of digitization is also modeled, but in a general way in order to preserve an upgrading capability to the system. Machine and sensor actually used are then presented and their integration exposed. Current process of digitization is then detailed, after what a critical analysis from the considered point of view is carried out and some solutions are suggested. The paper concludes on the laid down prospects and the next projected developments.

Intravesical Dosimetry Numerical Tool for PhotoDynamic Therapy

Abstract To determine the urothelium illumination which, at a specific time, is actually known only at a few samples points, we describe the computation of an illumination model based on a tri-dimensional splines interpolation function.