Literatura académica sobre el tema "Génie acoustique – Mesure"
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Artículos de revistas sobre el tema "Génie acoustique – Mesure"
Muller, Aurelia Marine, Claudia Thurnherr y Daniel Algernon. "Intégration d’un système CND Impact Echo sur un drone". e-journal of nondestructive testing 28, n.º 9 (septiembre de 2023). http://dx.doi.org/10.58286/28518.
Texto completoTesis sobre el tema "Génie acoustique – Mesure"
Bouaziz, Adel Nabila. "Diagnostic de l'hyperréactivité bronchique chez l'enfant : intérêt de la méthode des oscillations forcées (doctorat : génie biologique et médical)". Nancy 1, 1998. http://www.theses.fr/1998NAN11019.
Texto completoDe, Bort Inès. "Mesure et simulation acoustiques en milieu urbain". Electronic Thesis or Diss., Pau, 2023. http://www.theses.fr/2023PAUU3037.
Texto completoIn this thesis, we propose a method to guide the acoustic design process at different scales, from a classroom to an entire city. For this purpose, we have developed a raytracing method designed to track the multiple reflections of sound in complex 3D scenes.In room acoustics, the two most usual challenges are to determine the ideal layout for a given amount of acoustic absorber, and to orient reflective panels in excessively reverberant rooms. Traditionally, acoustic parameters (sound level, reverberation time, clarity) have been used to detect areas of the audience where acoustic comfort is not guaranteed. However, they do not systematically identify which areas of the stage need to be modified. For the first application, we propose a panoramic image that synthesizes the arrival directions of multiple reflections, on all the receivers that make up the audience. This graphic is used to find the ideal location for absorbent panels in a classroom, and to improve the shape of an acoustic false ceiling inside a chapel. The results show significant improvements in clarity values in both cases. In the classroom, the result was verified by measurement in the presence of a live audience. In the chapel, another graphic based on the same principle was used to study the acoustic envelopment effect (lateral energy).In urban environments, noise pollution has considerable impact on the comfort and health of residents. In addition to the presence of numerous noise sources, multiple reflections between building facades contribute to increasing ambient noise levels. For the second application, we propose to treat the design of a city like that of a concert hall, by studying the role of the buildings' shape on the propagation of sound reflections. Here, we invert the panoramic graph proposed in the first application to represent the multiplicity not of receivers, but of sound sources. The result can then be compared with field measurements taken with an acoustic camera. The study will examine Pasaia, a small port town in the Spanish Basque Country, which features a variety of urban patterns: a historic center, tall towers, a harbor, narrow pedestrian streets and major roadways. Acoustic camera measurements and raytracing simulation revealed three distinctive urban configurations. Based on these findings, the simulation is used to propose different scenarios for modifying the shape of the city in order to reduce noise levels on the most exposed facades.Raytracing simulation and spatial representation of multiple reflections, either on multiple receivers or from multiple sources, provide guidance for the shape and material design, regardless of the geometry of the scene and contribute to the multidisciplinary approach of Urban Physics
Chusseau, Maylis. "Contribution à la réduction du bruit d'hélice sur avion monomoteur à pistons". Toulouse 3, 1995. http://www.theses.fr/1995TOU30018.
Texto completoRenaud, Guillaume. "Mesure de non-linéarités élastiques et dissipatives par interaction d'ondes acoustiques : application à la quatification du micro-endommagement de l'os trabéculaire". Thesis, Tours, 2008. http://www.theses.fr/2008TOUR4012/document.
Texto completoMicro-cracks are normally generated in bone tissue and resorpted by permanent bone remodeling. A high crack density could a?ect bone strength. But the causes and consequences on bone strength of a microdamage accumulation are badly understood. Moreover no technique is available for noninvasive assessment of the level of bone damage in vivo. In that context, an acoustical method was developed for localized and non-contact measurement of elastic and dissipative nonlinearities, based on the interaction between a low-frequency acoustic pump wave and ultrasound probing pulses. The ultrasound pulses are emitted with a repetition frequency 10 times higher than the low frequency of the pump wave. The medium is thus probed in di?erent states of triaxial stress, successively in tension and in compression. The ultrasound time of ?ight and amplitude (or energy) modulations give access to nonlinear elasticity and dissipation, respectively. The amplitude of acoustic nonlinearities generally increases with the level of damage in materials. After validation in water and undamaged solids, measurements were conducted in cracked and granular media and showed a good sensitivity of the method to the presence of cracks and contacts between grains. Finally its application to calcaneus trabecular bone showed that the low-porosity region can exhibit high acoustic nonlinearities. Furthermore, for mechanically damaged samples, either in compressive fatigue or in quasi-static compression, the amplitude of acoustic nonlinearities were well correlated with the level of damage observed by histology
Rosenkrantz, Eric. "Conception et tests d’un capteur ultrasonore dédié à la mesure de la pression et de la composition des gaz de fission dans les crayons combustibles". Montpellier 2, 2007. http://www.theses.fr/2007MON20247.
Texto completoBenamar, Mohamed Amine. "Développement d’une approche numérique et expérimentale par la mesure VLD pour la propagation acoustique mutimodale en conduit avec écoulement". Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2624.
Texto completoLaser Doppler Velocimetry (LDV) is a non-intrusive measurement of particle velocity classically used in fluid mechanics. The acoustic velocity is a very important quantity in acoustics for the characterization of acoustic propagation fields, which is essential for the understanding of certain propagation phenomena in near walls or for complex geometries. The DUCAT bench installed in the laboratory of the Acoustics and Vibration team of the University of Technology of Compiègne aimed at characterizing the acoustic performances of various acoustic absorption systems such as SDOF or metallic porous materials for aeronautical uses through the measurement of the acoustic velocity and pressure through two automated probes containing a hot wire sensor as well as a microphone with ogive. The objective of this thesis is to allow the measurement of acoustic velocity in multimodal propagation and in the presence of flow using the VLD. The signal measured by the VLD is randomly sampled and has a fairly large background noise due to the presence of flow in the duct. The complex nature of the measured signal requires special signal processing methods to extract the acoustic velocity that is important to us. The first part of this thesis presents a benchmark of the different methods available in the literature and their validity for the current experimental conditions of the DUCAT bench. A simulation of the measured VLD signal is developed as a reference to validate the methods, whether they are spectral or temporal. The weighted least squares method is finally selected and adapted following this study for the estimation of the various acoustic parameters from the raw signal. The second part concerns the presentation of the numerical tools used or developed for the simulation of the acoustic propagation in infinite ducts. The main numerical tool is an aeroacoustic finite element code developed in the lab based on Galbrun’s equations coupled to a virtual absorbing layer called PML (Perfect Matched Layer). Due to the presence of the PML, the numerical solution of the inverse problem becomes complicated, which led us to develop a code for solving nonlinear eigenvalue problems based on the Integral Contour method. The third part of this work presents the different components of the modified version of the bench as well as the characteristics of these different components. The bench allows the experimentation of multimodal acoustic propagation (up to 5000 Hz) in the presence of a suction/expiration flow that can reach a speed of Mach 0.25. The fourth and last part, presents a protocol of experimental numerical validation of all the tools presented and developed. The test/calculation comparisons are presented for a multimodal propagation in a straight duct at first. The results allow to conclude on the efficiency of the measurement and signal processing system with a relative error lower than 1 dB. The same protocol is then used for the experimental study of the acoustic trapped modes in the case of a cylindrical duct with an abrupt change of section
Bodrero, Alain. "Contrôle d'un champ acoustique à l'intérieur d'une cavité par des moyens passifs en régime harmonique". Rouen, 1999. http://www.theses.fr/1999ROUES029.
Texto completoRodriguez, Samuel. "Phénomènes ondulatoires dans les lignes d'admission d'air et leur influence sur les performances des moteurs à combustion interne". Toulouse 3, 2009. http://www.theses.fr/2009TOU30094.
Texto completoThe pressure wave generated by the moving of the piston during the intake stroke of an internal combustion engine propagates in the duct carrying cool gases and comes back to the cylinder by reflections. Acoustic phenomena can increase the amount of air trapped in the engine by 30% and so its performances. Acoustic propagation in ducts carrying a turbulent flow is modelled in one and three dimensions. The input impedance is calculated and compared to the results of a new measurement procedure with steady flows up to Mach number M=0. 15. A new method for measuring transfer matrices without flow has also been developed. Its results agree well with theory. The effect of acoustic properties of intake systems in the amount of air trapped in a one cylinder engine is modelled as a non-linear coupling of the combustion chamber with the input impedance, by a mechanical analogy. The acoustic pressures computed agree fairly well with the pressures measured in two different intake systems of a one-cylinder cold engine. The link between the acoustic properties of the intake duct expressed in the frequency domain alone and the volumetric efficiency of a cylinder has been quantified on a large range of running speed for the first time. In a multi-cylinder engine, the timing difference between intake strokes produces interferences in the intake system. The calculated impedance matrix and the study of phase explain a performance difference between cylinders that occurs in a turbocharged engine
Bennouna, Saâd. "Caractérisation aéroacoustique d'éléments et associations d'éléments de systèmes de ventilation d'air pour l'automobile". Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2303/document.
Texto completoPassenger’s thermal comfort inside car cabin is mainly provided by the heating ventilation and air conditioning system (HVAC). The main part of HVAC modules is placed under the dash board. An HVAC module is a compact system composed of various elements which are subject to airflow. The interaction between airflow and these in-duct elements generates noise inside car cabin. Furthermore, the blower used to blow air inside the cabin must overcome the pressure generated by HVAC elements. Noise is created and its level is linked to flow and pressure. HVAC noise is an important issue for car makers and automotive suppliers wishing to reach passenger’s satisfaction. Furthermore, thermal-engine cars are more and more silent. Also hybrid and electric car sells are expanding around the world. HVAC noise became a main issue for automotive actors. Under CEVAS project, Valeo is aiming to develop a prediction tool to design HVAC systems providing sound quality data. Within CEVAS project the UTC is in charge of performing measurements on academic elements and industrial HVAC components : diaphragm, flaps,…
Coguenanff, Corentin. "Conception robuste aux incertitudes des systèmes légers bois envibro-acoustique linéaire". Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1166/document.
Texto completoBeing able to understand and predict the vibroacoustic behavior of lightweight wood-based building systems contitute a serious scientific concern. In 2015, acoustic comfort investigation claims that unsatisfactions are expressed with respect to around 50% of such constructions. In particular, low frequency discomfort is target of criticism. A methodology was proposed, currently running through standardisation process, which translates the individual performance of the building systems into a global building performance index. The challenge consequently lies in the prediction of the individual performances in regard to the wide spread of wood based designs. In this research, a methodology is introduced for the construction of computational models able to handle the complexity and diversity of the systems, constituted of multiple boards, stiffeners, cavities and poroelastic media. Structural excitations of the system are constructed according to standard evaluation procedures. Then, a probabilistic approach is undertaken in order to take into account the uncertainty problematic, inherent to lightweight wood based constructions. In particular, stochastic inverse problems are constructed to identify, from experimental measurements, hyperparameters associated with ad hoc probabilistic models. Eventually, uncertainty quantification can be performed in regard to predicted performance in laboratory conditions. Following, robust optimal designs are sought in the presence of uncertainties. No continuous mapping from the search space of the configurations to the space of the fitness functions representative of the objective performance exists and derivatives cannot be defined. By way of consequence, the class of the evolutionnary algorithm, suited to discrete search spaces as well as multi-objective optimisation, is chosen. Considered optimisation problems displayed preferential directions of the genetic algorithm towards stiffest admissible designs
Libros sobre el tema "Génie acoustique – Mesure"
D, Snyder Scott, ed. Active control of noise and vibration. London: E. & F.N. Spon, 1997.
Buscar texto completoHansen, Colin H. Active control of noise and vibration. 2a ed. Boca Raton, FL: Taylor & Francis, 2013.
Buscar texto completoActas de conferencias sobre el tema "Génie acoustique – Mesure"
SOTTOLICHIO, Aldo, David HURTHER, Philippe LAGUIONIE y Caroline POULLAIN. "Concentration en matières en suspension dans la crème de vase estuarienne par mesures optiques et acoustiques". En Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2010. http://dx.doi.org/10.5150/jngcgc.2010.065-s.
Texto completoDURAFOUR, Marine, Xavier DEMOULIN, Thierry GARLAN, Laurent GUILLON y Patrick GUYOMARD. "Mesures in situ des propriétés acoustiques de zones littorales françaises et corrélation avec les paramètres sédimentologiques". En Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2016. http://dx.doi.org/10.5150/jngcgc.2016.042.
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