Simulation numérique d'un disque de frein automobile par une methode de calcul eulerien

No abstract provide

Une méthode de calcul de structures soumises à des chargements mobiles

No abstract provide

Multiscale approach for anisothermal high-cycle fatigue

No abstract provide

Simulation Tools for Virtual Homologation of Pantographs

This paper addresses the use of numerical simulations to extend the physical pantograph homologation to virtual processes. Based on existing standards criteria, the methodology presented here leads to time reduction and cost savings in an effort for the acceptance of a new vehicle already accepted in other countries. The main goal is to guarantee full confidence in the proposed methodology and to make the final homologation decision easier to take. It is composed of three steps: "validation", "modification" and "extension". Firstly, an enhanced validation tool is proposed to improve comparisons between simulation and inline measurements. Secondly, several kinds of irregularities are introduced in the numerical models such as contact wire height and aerodynamic forces to make the simulations closer to the operating conditions. Finally, a new graphical tool is proposed in order to assess the dynamic behaviour of the interoperable pantograph catenary couple in a large range of operational conditions. Called a "homologation map", this mapping tool gathers existing limits from the standards on the same graph. This procedure is exemplified by extending the homologation of a French pantograph under the German catenary and applied to multiple units

Determination of the stabilized response of a structure undergoing cyclic thermal-mechanical loads by a direct cyclic method

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Autofeeder for shrink wrap labeling machine

Plastimer Industrial Corporation is a subcontractor for Unilever Philippines in the production of Sunsilk shampoo bottles. The bottles are labeled through a process called heatshrinking, in which the bottle is inserted into the heat-sensitive plastic, also known as the shrinkwrap, and then heated to allow the shrinkwrap to adhere to the bottle. Currently, the process of inserting the bottle into shrinkwrap is still done manually, with annual labor costs exceeding PhP 2,000,000. It is this high labor cost that has spurred the development of the autofeeder for shrinkwrap labeling machine. The autofeeder for shrinkwrap labeling machine is a prototype mechatronic system that automatically opens the shrinkwrap and inserts the bottle into the shrinkwrap. The prototype autofeeder for shrinkwrap labeling machine has been proven to have a high degree of repeatability, as shown through various experiments. Furthermore, experiments have shown that the prototype system has a high output yield, which can still be improved upon. Experiments have also shown that the prototype has an output rate comparable to that of manual labor. Capital costs to be incurred in the conversion to the automated process have been shown to be recoverable within a year of use. In conclusion, the autofeeder for shrinkwrap labeling machine is an automated and economically viable alternative to the manual insertion of bottles into the shrinkwrap. With the high labor cost being incurred at the present, companies that engage in this type of operation will find it worth their while to initiate automation efforts through this prototype

Mechanical and thermal properties of Carpinas betulus fiber filled polypropylene composites

WOS: 000506395200001The aim of this study is to demonstrate whether Carpinus betulus L. (CB) powder can be used as an alternative filler/reinforcement material for polypropylene (PP). About 5, 10, 15, and 20 wt% CB loaded PP composites were prepared by a high-speed thermokinetic mixer. in this article, the effects of weight fraction of CB within PP on thermal, viscoelastic, chemical, mechanical, crystallographic, and morphological properties of PP composites were investigated by tensile and three-point bending test, dynamic mechanic analysis, thermogravimetric analysis, differential scanning calorimetry, Fourier transform infrared analysis, and scanning electron microscopy. Melting temperature of the composites decreased with the increase of CB content. the crystallization temperature of PP increased with the addition of CB into PP. When 10 wt% CB filler was loaded into PP, the tensile of PP increased by about 29 wt%. the storage modulus of PP were remarkably enhanced with increasing CB weight fraction. About 5 wt% CB addition into PP increased the flexural strength of PP by about 32%