Showing papers by "Conservatoire national des arts et métiers published in 2023"
TL;DR: In this article , the authors focus on projects of blue-green infrastructures located in two middle-sized French cities in the Western part of FranceFrance, on the Loire river basin (the Ile aux Planches urban parkPark in Le Mans and the Parc Balzac in Angers).
Abstract: This chapter focuses on projects of blue-green infrastructuresGreen infrastructure (BGI) located in two middle-sized French cities in the Western part of FranceFrance, on the Loire riverRiver basin (the Ile aux Planches urban parkPark in Le Mans and the Parc Balzac in Angers). They constitute illustrations of recent and innovative approaches in the design of BGI in FranceFrance. In both cases, planners had to face major challenges, whether technical or political. Innovative solutions were found to overcome technical difficulties (projects located in flood-prone areas, on brownfield sites and facing heavy pollution). Local oppositions and strong involvement of inhabitants forced planners to redefine and improve their projects. We point out how planners successfully turned those various constraints into assets and synergies to design multifunctional BGI in both cases. However, when comparing the projects, we see important differences. In Parc Balzac, planners clearly succeeded in designing a project with strong synergies between its various functions (biodiversityBiodiversity protection, leisure and education to environment, flood risk management). In the case of the Ile aux Planches, in Le Mans, synergies are not so obvious. In a broader perspective, this chapter questions the concept of BGI and its capacity to address the question of synergies between functions in green parksPark.
TL;DR: In this paper , the authors investigated the proposed medium access control protocols and focus more on the TDMA-based protocols optimized by the need for Artificial Intelligence (state-of-the-art) to ensure safe and reliable IV (inter-vehicles) communications.
Abstract: Vehicular Ad-hoc Network (VANET) has attracted the research community’s attention in recent years due to its secure and safe applications on roads, ensuring unidentified transmission and advanced safety. An advanced safety system has been put in place to guarantee that all messages exchanged between vehicles are reliable. The Medium Access Control (MAC) protocols are needed to transmit the data between vehicles. There are different types of roads (highway, urban), then the design of these protocols changes according to the density of vehicles. The jam or the high mobility could cause a problem of collision to access the channel. To avoid these cases and to decrease hazards on roads (accidents), scientists have proposed many techniques to optimize the control of TDMA-based MAC protocols. Our object is to investigate the proposed MAC protocols and focus more on the TDMA-based protocols optimized by the need for Artificial Intelligence (state-of-art) to ensure safe and reliable IV (Inter-vehicles) communications. The classification, the Artificial Intelligent methods, and the proposed real datasets for optimizing these protocols are presented in this work.
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22 Feb 2023TL;DR: In this article , the authors proposed a numerical approach based on the application of the finite element method for modeling the studied structure which will be excited by a diffuse field and calculated its sound radiation is calculated by applying the infinite elements method.
Abstract: Roller shutter boxes are facade elements of paramount importance in the thermal and acoustic insulation of buildings. Their sound transmission is generally characterized by carrying out laboratory tests according to standards. These tests have the disadvantage of their high cost and their lack of repeatability and reproducibility between the experimental measurements, especially in the low frequency range. The purpose of this work is to propose a numerical model able to predict the vibro-acoustic response of roller shutter boxes. The proposed numerical approach is based on the application of the finite element method for modeling the studied structure which will be excited by a diffuse field. Its sound radiation is calculated by applying the infinite elements method. The experimental protocol used to measure the sound transmission of an element in a laboratory is exposed. Two cases are studied with and without insulation for the roller shutter box. The results of the proposed numerical model are validated by comparison to the results of laboratory tests.
01 Jan 2023
TL;DR: In this article , the effects of lead rubber bearings (LRB) or viscous dampers (VD) in irregular in plan reinforced concrete buildings were investigated under earthquake recorded accelerograms, three of them are real and the other four are artificial, by nonlinear dynamic time-history analyses.
Abstract: The aim of this paper is to present the effects of lead rubber bearings (LRB) or viscous dampers (VD) in irregular in plan reinforced concrete buildings. The buildings (a three-story building, an eight-story building, and a twenty-story building) had been studied under earthquake recorded accelerograms, three of them are real and the other four are artificial, by nonlinear dynamic time-history analyses. In this paper the optimal design of LRB bearings and viscous dampers is described, focusing the design on minimizing certain parameters: (i) the maximum displacement (top of the structures), (ii) the torsion of the buildings, (iii) the base shear loads and, (iv) the maximum horizontal interstory drift. The comparative results show the effectiveness of the VD in terms of minimizing the torsion effects for all the buildings, and mostly in the low rise one. However, the use of LRB provides a significant reduction for all the buildings in terms of minimizing the rotation, the maximum acceleration, the max-story drift, the maximum displacement and the base shear loads.