Chatter maps for process design of powertrain components

in Moisan, Alphonse; Poulachon, Gérard (Eds.) Proceedings of the 7th CIRP International Workshop on Modeling of Machining Operations (2004, May)

During rough machining operations of powertrain components, chatter vibrations may occur on the edges of flexible structures. This paper presents a numerical method, based on the finite element method and ... [more ▼]

During rough machining operations of powertrain components, chatter vibrations may occur on the edges of flexible structures. This paper presents a numerical method, based on the finite element method and Tlusty's theory, which gives a chatter map of the machined surface. Each map point represents the greatest depth of cut leading to unconditionally stable cut. Each value depends on the structural damping, the cutting stiffness and the local static stiffness, which is computed using conventional linear elastic FEA. Chatter maps offer a convenient and effective decision support system for robust process design. As a case study, the rough milling operation of a crankcase deck face with a two-stage cutter is presented. [less ▲]

Prise en compte des pressions réparties dans les plaques équilibre

Report (2004)

Equilibrium plate elements are not, in their simplest version, able to take account of a distributed pressure. A particular solution has then to be added. One such solution was develpped by Sander, but is ... [more ▼]

Equilibrium plate elements are not, in their simplest version, able to take account of a distributed pressure. A particular solution has then to be added. One such solution was develpped by Sander, but is only suitable for elements with first degree moments, as it makes use of the side Kirchhoff loads. This paper is devoted to the construction of a particular solution which is equilibrated by corner loads only and, therefore, compatible with the simplest plate element, that is Morley's one [less ▲]

Design of an implantable micropump

in Proceedings of the International Precision Assembly Seminar (2004, February)

The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are ... [more ▼]

The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are limited by their rather expensive cost. The challenge is therefore to develop a low cost alternative by reducing the number of parts and by simplifying the assembly. As the pump and its tank will be placed under the skin in order to increase comfort, such a system should be small and reliable. In this paper, we present the micropump we developed within the framework of the 4M-µ pump interuniversity project (Methods and Means for the Miniaturization of Machines). [less ▲]

Rapport final de synthèse du projet 4M-µpompe (2001-2003). Annexes Partie 2/2 (sections 3/6,7,8,9-4-5-6-7-8)

Report (2004)

micropump : drawings, tests, publications, manufacturing, medical aspects, micellaneous aspects

Rapport final de synthèse du projet 4M-µPompe (2001-2003)

Report (2004)

The 4M-µpump project attempts to breach the gap between traditional mechanics and micro mechanics and this in two ways. The first one consists in producing a general set of rules suitable for the ... [more ▼]

The 4M-µpump project attempts to breach the gap between traditional mechanics and micro mechanics and this in two ways. The first one consists in producing a general set of rules suitable for the miniaturisation of well-known macromachines. The second one consists in developing this fundamental aspect of the research through the design and realization of an implantable pump dedicated to the administration of medication agents inside the human body. The project thus touches upon the field of design, manufacturing, metrology and assembly of mini components as well as the study of minimotors. [less ▲]

Manufacturing of a circular notch hinge as guiding system by electrical discharge machining

Poster (2003, April)

Presentation of the notch hinge as a guiding system. Its manufacturing by wire electro-discharge machining. Notch design parameters. Future work.

Fundamentals of finite elements

Book published by Les Editions de l'Université de Liège (2003)

This book presents the text of an introductory course on finite element methods. As written by a member of the Aerospace Laboratory of the University of Liège, it reflects the general philosophy of this ... [more ▼]

This book presents the text of an introductory course on finite element methods. As written by a member of the Aerospace Laboratory of the University of Liège, it reflects the general philosophy of this pioneering research team. [less ▲]

Fonctionnement et performances des couloirs oscillants à glissement

in European Journal of Mechanical and Environmental Engineering (2001), 46(4), 243-254

This paper is devoted to the study of the efficiency of an oscillating trough for any value of the frequency. It is found that pure slipping or mixed cycles may occur, the latter comprising sticking ... [more ▼]

This paper is devoted to the study of the efficiency of an oscillating trough for any value of the frequency. It is found that pure slipping or mixed cycles may occur, the latter comprising sticking periods. The results of the present analysis concern the cyclic displacement, the mean velocity and the dissipated power. [less ▲]

Predicting the fatigue notch effect from partial experimental data

in Culley, S.; Duffy, A.; McMahon, C. (Eds.) et al Proceedings of the 13th International Conference on Engineering Design. Design methods for performance and sustainability (2001, August)

This paper is devoted to a new method of fatigue strength assessment, which is based on similarity relations and former results of the author on the gradient method.

Face milling and turning simulation with the finite element method

in Habraken, Anne (Ed.) Proceedings of the 4th International ESAFORM Conference on Material Forming (2001, April)

The paper describes a new simulation tool that gives the machined surface error in face milling and turning. The form error component due to the workpiece flexibility is computed using Samcef finite ... [more ▼]

The paper describes a new simulation tool that gives the machined surface error in face milling and turning. The form error component due to the workpiece flexibility is computed using Samcef finite element code. The finite element analyses are very efficient on industrial applications thanks to the superelement method. Results are obtained in a short time which makes possible a wide range of simulations such as finding the best tool trajectory, testing several tools and cutting conditions and choosing the most suited fixture design. [less ▲]