Ducellier G.,UTT |
Yvars P.-A.,SUPMECA |
Eynard B.,Compiègne University of Technology
International Journal on Interactive Design and Manufacturing | Year: 2014
This paper focuses on the impact of Design Change Orders (DCO) on the product data into a PLM platform. In a context of concurrent engineering, we concentrate on the management of product data associated to the product structure. As PLM platform architecture is not fully adapted to conduct DCO on the product data, we propose a specific approach for facilitating DCO execution and comprehension. In this context, a constraint based approach is proposed. The aim of this approach is to provide a view of all the product data concerned by the DCO at the beginning of the DCO process. Based on this view, called product data constraint graph, the project leader can assign the corresponding resources to the DCO process. An example illustrates the benefits of our proposition and the first results concerning this underdevelopment approach are presented. © 2014 Springer-Verlag France.
Vallet F.,Compiègne University of Technology |
Eynard B.,Compiègne University of Technology |
Millet D.,Supmeca |
Mahut S.G.,Compiègne University of Technology |
And 2 more authors.
Design Studies | Year: 2013
The practice of eco-design requires relating traditional design criteria to new environmental criteria. So far, few studies have investigated the nature and singularities of eco-design. This article provides some elements of response based upon the redesign of a consumer product (disposable razor). The study was conducted by three groups of experienced eco-designers using existing eco-design tools (SIMAPRO, ECOFAIRE, ECODESIGN PILOT). A protocol analysis with a three-level coding of transactions was carried out for this purpose. Two main findings are reported: (1) environmental assessment, solution finding and strategy definition are the activities which differentiate eco-design from design; (2) environmental initial assessment and strategy definition are more heavily influenced by eco-designers' expertise than support from tools. © 2012 Elsevier Ltd. All rights reserved.
French National Center for Scientific Research, University of Maine, France and Supmeca | Date: 2014-08-29
The invention relates to an acoustically absorbent cell (22, 48) for an acoustic panel, comprising a layer (32) with a porous matrix incorporating a plurality of acoustic resonators (A_(1)-A_(4), B_(1)-B_(6)) between a first face (30, 54) and a second face (28, 56) of the porous matrix (32). According to the invention, the resonators (A_(1)-A_(4), B_(1)-B_(6)) are for example ordered so as to form at least two substantially parallel rows (24, 26, 50, 52) each comprising at least two resonators and extending along the first and second faces.
Schoeftner J.,Johannes Kepler University |
Buchberger G.,Johannes Kepler University |
Smart Structures and Systems | Year: 2016
This contribution presents an extended one-dimensional theory for piezoelectric beam-type structures with non-ideal electrodes. For these types of electrodes the equipotential area condition is not satisfied. The main motivation of our research is originated from passive vibration control: when an elastic structure is covered by several piezoelectric patches that are linked via resistances and inductances, vibrational energy is efficiently dissipated if the electric network is properly designed. Assuming infinitely small piezoelectric patches that are connected by an infinite number of electrical, in particular resistive and inductive elements, one obtains the Telegrapher's equation for the voltage across the piezoelectric transducer. Embedding this outcome into the framework of Bernoulli-Euler, the final equations are coupled to the wave equations for the longitudinal motion of a bar and to the partial differential equations for the lateral motion of the beam. We present results for the wave propagation of a longitudinal bar for several types of electrode properties. The frequency spectra are computed (phase angle, wave number, wave speed), which point out the effect of resistive and inductive electrodes on wave characteristics. Our results show that electrical damping due to the resistivity of the electrodes is different from internal (=strain velocity dependent) or external (=velocity dependent) mechanical damping. Finally, results are presented, when the structure is excited by a harmonic single force, yielding that resistive-inductive electrodes are suitable candidates for passive vibration control that might be of great interest for practical applications in the future. Copyright © 2016 Techno-Press, Ltd.
Krommer M.,Johannes Kepler University |
Berik P.,Johannes Kepler University |
Acta Mechanica | Year: 2013
This paper is concerned with the analysis of two types of piezoelectric torsion transducers using the d 15-effect of mono-morph piezoelectric materials. The first problem is concerned with a bi-morph transducer made of two identical mono-morph straight rods, which are perfectly bonded to each other along their width; the polarization direction is parallel, but opposite in sign, such that the piezoelectric material parameter d 15 has an opposite sign as well. The second problem sandwiches the bi-morph transducer between two identical elastic face layers. In both cases, the resulting transducer represents a torsion transducer. Therefore, we analyze the electromechanically coupled problem in the framework of Saint Venant's torsion theory for straight rods taking into account the electrical problem as well. The results of our approach are compared to electromechanically coupled three-dimensional finite element computation and a very good agreement for the mechanical as well as the electrical entities is achieved, in particular for the rate-of-twist, the axial warping function, and the sensed voltage. © 2013 Springer-Verlag Wien.
Yannou B.,École Centrale Paris |
Yvars P.-A.,Supmeca |
Hoyle C.,Oregon State University |
Chen W.,Northwestern University
Journal of Engineering Design | Year: 2013
While the marketing literature has advocated for decades that new products should be designed for intended and anticipated consumer usages, the engineering literature mostly proposes optimisation of product performances independent of specific users' skills, anticipated usage scenarios, and competing products in the market. In contrast to tedious market studies which assume an existing market experience for products and optimisation approaches based upon static product performances, we propose an adaptable approach to designing a product or product family: the set-based design by usage coverage simulation. It starts with generating a usage scenario space for a set of representative users. Next, considering a candidate set of products, one proceeds to the constraint satisfaction problem computations of feasible usage scenarios, assuming that physics-based models of performances are available. The comparison between the expected and feasible usage scenarios at the scale of a single user leads to Usage Coverage Indicators and finally to a preferred product which best covers the usage scenario space. At the level of a targeted consumer group, the approach provides a market share simulation for competing products or members of a scale-based product family. The design of a family of jigsaws thoroughly illustrates our approach. © 2013 Copyright Taylor and Francis Group, LLC.
Santibanez F.,University of Santiago de Chile |
Munoz R.,University of Santiago de Chile |
Caussarieu A.,University of Santiago de Chile |
Caussarieu A.,Laboratoire Of Physique |
And 2 more authors.
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2011
We study experimentally the interaction between two solitary waves that approach one another in a linear chain of spheres interacting via the Hertz potential. When these counterpropagating waves collide, they cross each other and a phase shift in respect to the noninteracting waves is introduced as a result of the nonlinear interaction potential. This observation is well reproduced by our numerical simulations and is shown to be independent of viscoelastic dissipation at the bead contact. In addition, when the collision of equal amplitude and synchronized counterpropagating waves takes place, we observe that two secondary solitary waves emerge from the interacting region. The amplitude of the secondary solitary waves is proportional to the amplitude of incident waves. However, secondary solitary waves are stronger when the collision occurs at the middle contact in chains with an even number of beads. Although numerical simulations correctly predict the existence of these waves, experiments show that their respective amplitudes are significantly larger than predicted. We attribute this discrepancy to the rolling friction at the bead contact during solitary wave propagation. © 2011 American Physical Society.
Peyret N.,ParisTech National School of Bridges and Roads |
Dion J.-L.,Supmeca |
Chevallier G.,Supmeca |
Argoul P.,ParisTech National School of Bridges and Roads
International Journal of Applied Mechanics | Year: 2010
The friction between interfaces at bolted joints plays a major role in the damping of structures. This paper deals with the energy losses caused by micro-slips in the joints. The aim of this study is to define in an analytical way these energy dissipation mechanisms which we examine through the analysis of a new benchmark: the flexural vibration of a clamped-clamped beam with original positioning of the interfaces. The joints exhibit the behavior of an interface under constant and uniform normal stress. The stress and strain values are computed at the joints under the assumption of quasi-static motion. This model allows us to understand the evolution of the slip and stick regions along the joint interfaces during the loading process. The expressions of the strain and stress fields during each phase of the loading process are derived. These lead to the quantification of the dissipated energy within the interface. Using this formula, a nonlinear loss factor can then be computed. In the final part of the paper, the dynamic response of the beam is calculated using this nonlinear loss factor. © 2010 Imperial College Press.
Hammadi M.,Supmeca |
Choley J.-Y.,Supmeca |
Advanced Engineering Informatics | Year: 2014
Mechatronic design aims to integrate the models developed during the mechatronic design process, in order to be able to optimize the overall mechatronic system performance. A lot of work has been done in the last few years by researchers and software developers to achieve this objective. However, the level of integration does not yet meet the purposes of mechatronic system designers, particularly when dealing with modeling changes. Therefore, new methodologies are required to manage the multi-view complexity of mechatronic design. In this paper, we propose a multi-agent methodology for the multi-abstraction modeling issue of mechatronic systems. The major contribution deals with proposing a new method for the decomposition of the multi-level design into agents linked with relationships. Each agent is representing an abstraction level and both agent and relationships are managed with rules. By considering an application to a piezoelectric energy harvesting system, we show how we associate agents, rules and inter-level relationships to multi-abstraction modeling. We also show how modeling errors are identified using this approach. © 2014 Elsevier Ltd. All rights reserved.
Dion J.-L.,SUPMECA |
Chevallier G.,SUPMECA |
Mechanical Systems and Signal Processing | Year: 2013
This paper deals with the damping caused by friction in joints. A new test bench is presented and justified by comparisons made with devices described in the literature. The purpose of this academic bench is to measure the damping induced by partial slip and friction in a planar joint. Moreover, allows uncoupling normal static and dynamic tangential forces. A new method for so-called stopped-sine excitation was developed. It allows more precise monitoring of the evolution of the vibration frequency and damping of non-linear modes. This method is associated with piezoelectric exciters for greater efficiency when stopping excitation. A large number of experimental results are presented and discussed. They are used to characterize the damping induced by micro-sliding in the bonds. © 2012 Elsevier Ltd.