Дисертації з теми "Bruit – Combustion"
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Gentil, Yann. "Modélisation du bruit de combustion." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP007.
Combustion noise in turboshaft engines is becoming one of the main sources of aircraft noise, thanks to successive improvements aimed at reducing jet noise, fuel consumption and nitrogen dioxide generation. New-generation turboshaft engines are thus characterized by a more compact size (with fewer turbine stages) and more intense thermo-acoustic activity. Two mechanisms are responsible for combustion noise: direct noise from acoustic waves generated by the flame, and indirect noise from the acceleration and deceleration of non-acoustic fluctuations in the turbine stages. In this context, it is essential for the design of these engines to rely on a calculation methodology enabling the prediction of combustion noise and these two main generating mechanisms. To this end, CERFACS has been working for several years on the development of a calculation methodology based on large-scale simulation (LSS) of combustion chambers, coupled with an analytical method for propagating noise in the turbine stages.This thesis focused on the analytical models describing noise generation in nozzles (simplified turbine domain) and their validation by accurate unsteady numerical simulations. The model used to predict indirect noise due to composition fluctuations has been revisited and validated using simulations requiring the development of new non-reflecting conditions. This model was then extended to take into account temperature-dependent variations in the heat capacities of the species in the flow. Its impact on noise generation mechanisms is assessed using parametric studies. Finally, noise generation in turbines has been studied both theoretically and in an applicative way. On the one hand, after proposing a reduced analytical model describing 1D wave propagation at zero frequencies, this model is extended to all frequencies and compared with unsteady results in a stator. The propagation of 2D entropic waves in a stator and a nozzle is then performed and analyzed. On the other hand, the complete combustion noise calculation methodology, called CONOCHAIN, is applied on the basis of two-phase numerical simulation results for the TEENI helicopter engine as part of the CIRRUS project. Combustion noise levels are analyzed and compared at turbine outlet and far-field with previous experimental and numerical results
Livebardon, Thomas. "Modélisation du bruit de combustion dans les turbines d'hélicoptères." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0143/document.
The growth of air traffic at the vicinity of areas at high population density imposes to make quieter aircrafts on aeronautical manufacturers.The engine noise is one of the major contributors to the overall sound levels. Furthermore, the combustion is known to be responsible for a broadband noise generation at low-frequency. The combustion noise can be put into two main mechanisms. The first one is the emission of sound pulses by the unsteady heat release of the combustion process and is called the direct combustion noise. The second one is the generation of acoustic waves within the turbine stages by the acceleration of the temperature inhomogeneities and vorticity waves induced by the combustion and the turbulent flow within the combustor. This noise is the indirect combustion noise. These mechanisms were fully investigated in academic cases using experimental, analytical and numerical approaches contrary to the combustion noise within real engines. In this work, a hybrid approach called CONOCHAIN and based on LES of combustion chamber and an analytical disk theory to compute the combustion noise in a real turboshaft engine is evaluated. The predicted noise levels are compared with the experimental results obtained from a TURBOMECA engine in the framework of TEENI project (European project FP7) and analysed in this work where a turboshaft engine was instrumented to locate and identify the broadband noise sources. Two LES of a single sector of the TEENI combustion chamber representative of two experimental operating points are performed as well as a LES of the full-scale combustor at high power. The unsteady fields provided by the LES are used to compute direct and indirect combustion noise within the turbine stages in both cases and compared with the experimental results
Mazur, Marek. "Etude expérimentale du bruit de combustion dans un foyer de type aéronautique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC034/document.
Combustion noise has become an increasing contributor of overall aircraft engine noise. It consists of two major parts, direct and indirect combustion noise. The former is generated by the heat release fluctuations of the flame itself. The latter is generated by the temperature inhomogeneities in the burnt gases, which are accelerated in the turbine stages or nozzle following the combustion chamber.The aim of this work is to design and build a pressurized lean swirling combustor test bench, in order to quantify the two contributions.The combustor is thus supposed to generate high quantities of indirect combustion noise. The second aim is then to determine the contributions of direct and indirect combustion noise quantitatively and to gain insight about the sources of the two contributions. These analyses are conducted by different high-speed diagnostics, which were worked on during this work. These diagnostics allow to characterize the flow fields and flame dynamics, to put forward the combustion instability in the system and finally to quantify the direct and indirect combustion noise contributions
Porta, Mauro Poinsot Thierry. "Développement, vérification des outils LES pour l'étude du bruit de combustion et de l'interaction combustion / acoustique / turbulence." Toulouse : INP Toulouse, 2008. http://ethesis.inp-toulouse.fr/archive/00000507.
Tao, Wenjie. "Time resolved temperature and pressure based methodology for direct and indirect combustion noise separation." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC009/document.
The objective of the thesis is the development of a practical strategy to quantify experimentally indirect noise and to discriminate it from direct noise as they co-exist in most practical conditions. The configuration retained for the study is a test bench with a nozzle and the proposed the strategy relies on nozzle transfer functions. The first chapter defines the nozzle transfer functions used in the study as references for the validation of the strategy. The second chapter introduces an original setup that generates simultaneously direct and indirect noise without handling combustion. The third chapter details the methods to evaluate the acoustic and entropy waves from raw temperature and pressure signals. The fourth chapter closes the first part of the study by describing the strategy then testing it on high-fidelity simulation and experimental signals. The second part focuses on the use of the strategy in Large Eddy Simulations of a turbulent combustion test bench. Simulations are validated by experimental data then raw signals are processed to quantify the direct and indirect noise sources as well as the direct and indirect noise contributions
Porta, Mauro. "Développement, vérification des outils LES pour l'étude du bruit de combustion et de l'interaction combustion / acoustique / turbulence." Toulouse, INPT, 2007. http://ethesis.inp-toulouse.fr/archive/00000507/.
This work is about the Large Eddy Simulation (LES) of combustion instabilities in industrial burners and, in particular, the assessment of the quality of the results that can be obtained with this approach. The ability of the LES code AVBP of CERFACS to accurately compute simple configurations involving only one physical phenomenon (turbulence, acoustics or combustion) is firstly verified. Reactive and non-reactive academical test cases, for which the analytical solutions are known, are presented putting special emphasis on the influence of the numerical discretization and on its interaction with boundary conditions. Then, having gained confidence in the LES tool, the results obtained from a self-excited computation of a lab-scale burner are shown
Duran, Garcia-Rama Ignacio Luis. "Prediction of combustion noise in modern aero engines combining large eddy simulations and analytical methods." Thesis, Toulouse, INPT, 2013. http://www.theses.fr/2013INPT0138.
Combustion noise is increasing its relative contribution to aircraft noise, while other sources are being reduced and new low-NOx emission combustion chambers being built. Two mechanisms are responsible for this noise source: direct noise in which acoustic waves are generated by the flame and propagate to the outlet of the aero-engine, and indirect noise, where entropy waves generate noise as they are accelerated and decelerated in the turbine stages. In this work the analytical models used for the propagation of waves through non-homogeneous flows, including the generation of indirect noise, are revised and extended. In the first part, the quasi-1D case is studied, extending the analytical method to non-zero frequencies and validating the results with numerical methods and experimental data. In the second part, the 2D method for the case of compact turbine blades is studied and validated using numerical simulations of a rotating blade and of a complete turbine stage. Finally, in the third part of this thesis, these models are combined with reactive and compressible Large Eddy Simulations (LES) of combustion chambers to build a hybrid approach, named CHORUS, able to predict combustion noise
Pruvost, L. "Extraction du bruit de combustion d'un moteur Diesel. Développement et application d'un spectrofiltre." Phd thesis, INSA de Lyon, 2009. http://tel.archives-ouvertes.fr/tel-00429987.
Pruvost, Laurent. "Extraction du bruit de combustion d'un moteur Diesel. Développement et application d'un spectrofiltre." Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0054/these.pdf.
This PhD dissertation tackles the validation and application of a spectrofilter to separate the combustion and mechanical noises of a diesel engine. The spectrofilter is a transfer function estimate. In the present study's context, it estimates the vibroacoustic transfers of the combustion forces from the engine's cylinders to the listening spot. The spectrofilter is computed upon the in-cylinder pressure and engine noise signals. The method under study is an application of the cyclostationnarity theory. It consists in computing the spectrofilter upon the non-deterministic part of the signals. The point of this method is to reduce the error stemming from the correlation between combustion and mechanical sources. First, this method is argued on a theoretical basis and formalized so as to underline its advantages and drawbacks. Then, it is validated by various experimental results. Finally, the method is applied to estimate both the vibroacoustic transfers of combustion forces and the composition of the engine noise, as well as their variations with running condition (running speed, load and fuel's GTL content)
Becerril, Aguirre Cesar. "Simulation of noise emitted by a reactive flow." Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0067/document.
Combustion noise is increasing its relative contribution to aircraft noise, while other sources are being reduced and new low-NOx emission combustion chambers being built. Two mechanisms are responsible for this noise source: direct noise in which acoustic waves are generated by the flame and propagate to the outlet of the aero-engine, and indirect noise, where entropy waves generate noise as they are accelerated and decelerated in the turbine stages. In this work, the analytical models used for the propagation of waves through non-homogeneous flows, including the generation of indirect noise, are revised and extended. In the first part, the quasi-1D case is studied, extending the analytical method to non-zero frequencies and validating the results with numerical methods and experimental data. In the second part, the 2D method for the case of compact turbine blades is studied and validated using numerical simulations of a rotating blade and of a complete turbine stage. Finally, in the third part of this thesis, these models are combined with reactive and compressible Large Eddy Simulations (LES) of combustion chambers to build a hybrid approach, named CHORUS, able to predict combustion noise
Férand, Mélissa. "Far-field combustion noise modeling of turbofan engine." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0007.
Since the introduction of jet engine for aircraft propulsion in the 1950's, acoustics has become of great interest to the engine industry. While the initial turbojets were jet noise dominated, the introduction of turbofan engine in the 1960's gave relief in jet noise, but introduced fan noise. In the 1970's, with advanced noise reduction design features which provided a major reduction in aircraft noise, combustion noise became an interrogation. Indeed, more restrictive noise regulations could require that noise from the fan and jet be reduced to the point where combustion noise reduction may be required. Moreover, burner designs is controlled solely by the restriction of chemical pollutants produced by combustion, efficiency and consumption. The impact of these new concepts on combustion noise is not a strong constraint for design. Before considering to reduce combustion noise, it is necessary to first understand the different mechanisms. However, proposing a prediction method for combustion noise is not an easy task due to the multiple physical interactions involved during the combustion processes. Many experiments exist to evaluate the combustion noise from flames or combustion test rig. However, only a few include the complete propagation path of combustion noise within an engine device as it is difficult to isolate this acoustic source from the noise of the other engine modules. Empirical methods based on extrapolations and simplifications are often used for the prediction of combustion noise within modern aero-engines. Numerous acoustic analogies have also been derived from Lighthill. The work of this thesis proposes to study the combustion noise coming from an aircraft engine using a computational chain treating different modules from the generation of combustion noise to its propagation in far field. The importance of combustion noise for different operating points is highlighted. The noise-generating mechanisms will be identified in the combustion chamber. The role of the turbine as a noise attenuator and indirect noise generator will be evaluated as well as the far-field propagation considering inhomogeneous fields. Finally, an alternative strategy will also be proposed in order to consider the interaction between combustion noise and jet noise. To do so, LES of jet flow forced with combustion noise will be performed. A new approach will be proposed based on these results which seem to show that the combustion noise has an impact on the turbulence of the jet
Silva, Camilo F. "Numerical study of combustion noise in gas turbines." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20240/document.
Today, much of the current effort in combustion noise is the development of efficient numerical tools to calculate the noise radiated by flames. Although unsteady CFD methods such as LES or DNS can directly provide the acoustic field radiated by noise sources, this evaluation is limited to small domains due to high computational costs. Hybrid methods have been developed to overcome this limitation. In these schemes, the noise sources are decoupled from the radiated sound. The sources are still calculated by DNS or LES codes whereas the radiated sound is evaluated by acoustic codes using an acoustic analogy.In the present study, a numerical tool based on the Phllips' analogy for low Mach numbers flows has been developed. This tool accounts for the role of the boundary conditions in the resulting acoustic field. Both LES and the acoustic code developed here are used to assess the noise produced by a turbulent confined flame of a turbulent swirled-stabilized staged combustor. Good agreements are obtained between both techniques as long as the good quantities are compared: the pressure signal obtained directly from LES contains a non negligible amount of hydrodynamics that must be removed when a suitable acoustics-acoustics comparison is sought. The low Mach number assumption is completely realistic when considering the flow within a combustion chamber; it also conducts to considerable simplifications when leading with acoustic analogies. However, it cannot be used for the upstream (air-intake, compressors) and downstream (turbines, nozzle) of an aeronautical combustion chamber. A numerical tool is developed based on the quasi-1D Linearized Euler Equations in order to account for convective, non-isentropic and non-isenthalpic flows. By means of this tool, it is possible to estimate the acoustic boundary conditions that should be imposed at the inlet/oultlet of a given combustion chamber when performing low-Mach number acoustic computations
Zheng, Jun. "Étude analytique et numérique du bruit de combustion indirect généré par l'injection d'ondes entropiques dans une tuyère." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC070/document.
Due to the reduction of jet mixing noise and fan noise in modern aero engines, the relative contribution of combustion noise (CN) has significantly increased over the last few decades. Two mechanisms have been identified as CN in the 70’s: direct combustion noise (DCN) and indirect combustion noise (ICN). A focus is made on the ICN in this thesis with the development of a twodimensionalaxisymmetric semi-analytical model taking into account the distortion of the entropy waves in order to predict the ICN for nozzle flows. The state of the art performed in the first chapter highlights the necessity to improve the prediction of ICN of 1D models by introducing the radial distortion of the entropy waves inside the nozzle. The second chapter of the manuscript details the ONERA’s tools for studying ICN. The 2D model is developed in the third chapter where the Euler equations are rewritten in 2D formfor the entropic part while acoustic perturbations are considered to be 1D. The fourth chapter describes the numerical computations performed during the thesis onthe retained configuration (the DISCERN nozzle): a RANS and two large eddy simulations (LES) are carried out respectively for the use and the validation of the 2D model. In the last chapter, the application of the new model using the RANS meanfield is performed, the results are compared tothe 1D model and validated by confrontation with the LES predictions
Lamraoui, Ammar. "Acoustique et dynamique de flamme dans un foyer turbulent prémélangé swirlé : application à l'étude du bruit de combustion dans les chambres de turbines à gaz." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00678248.
Renard, Cyril. "Atténuation de structure et bruit de combustion : contribution à l'expertise NVH sur les moteurs Diesel." Le Mans, 2005. http://cyberdoc.univ-lemans.fr/theses/2005/2005LEMA1012.pdf.
Nowadays, the rise of international norms and customer's expectations have led on car manufacturers to optimize the vibroacoustic behaviour of their engines. This work focuses on the “structural attenuation” which represents the engines's intern dissipation properties of the combustion excitation. The aim is to develop a new structural attenuation calculation method with regards to industrial constraints. In the first part, the mecanisms of the combustion energy transmission described in the literature are analyzed using the coherence technique leading to the rankness of the different tranfer paths. Nevertheless, the diversity of the excitation sources and the strong non-linearity of the energy tranfer have limited this method. Then the following works tended to identify two main sources responsible for the Diesel engine noise signature in the time and in the frequency domains. Finally, the application of the Wiener filter theory has allowed us to determine the contribution of different known sources. A validation experimentation was performed on the vibration signals measured on the outer surface of the cylinder block in order to extract the contribution of the combustion source. As an application, the combustion noise was extracted from the radiated sound and used to assess the structural attenuation of the engine. The main benefit of this method lays on the experimentation time cost and the possibility of a sound design approach
Renard, Cyril Pascal Jean-Claude Sahraoui Sohbi. "Atténuation de structure et bruit de combustion contribution à l'expertise NVH sur les moteurs Diesel /." [S.l.] : [s.n.], 2005. http://cyberdoc.univ-lemans.fr/theses/2005/2005LEMA1012.pdf.
Schubert, Gwenaëlle. "Caractérisation et modélisation du bruit de brûleur de chaudière gaz." Compiègne, 1997. http://www.theses.fr/1997COMP1002.
The purpose of this study is to analyse and model the combustion noise of an atmospheric boiler. The bibliography gives information on the generation of noise by the flames as weil as the factors influencing combustion noise. The bumer noise is composed of combustion noise and gas flow noise. An experimental study on a real bumer permitted the effects of factors such as different types of fuel to be compared with those described in the bibliography. Rules defining the evolution of noise levels are extracted from the results obtained on three types of bumer and compared with the mathematical expressions relating acoustic power to the bumer parameters. The second section studies the application of techniques of identification and localisation of sources. N one of the existing techniques is adapted to sources in bumers which are enclosed in the combustion chamber. A new method based on inverse techniques was developed to identify and model these noise sources. The basic principle is that the bumer is modeiled by M sources or inputs and N responses or outputs. The spectra of the N responses are measured with microphones placed around the bumer during normal operation. The frequency response functions between the sources in the flames and the response signal are measured reciprocally using a monopole source at each output point and high temperature microphones at selected positions in the flames. The resulting frequency response function matrix is inverted using singular value decomposition techniques in order to calculate the spectra of the inputs from the measured response matrix. The technique was validated on known sources and burners before applying it to a boiler in real operating conditions. The model gives good results up to 2000 Hz
Emmanuelli, Ariane. "Numerical simulation and modelling of entropy noise in nozzle and turbine stator flows." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC067.
The investigation of combustion noise is motivated by its growing relative contribution to the noise emitted by modern turbofan engines overall, as well as its effect on low NOx emission combustor design. Entropy noise is a source of indirect combustion noise, which is generated by the acceleration of heterogeneities, in this case entropy, downstream of the combustion chamber. This study consists of the investigation of entropy noise in nozzle and turbine stator flow using both analytical and numerical methods. Nozzle flow is considered first. A Computational AeroAcoustics (CAA) reference case is built for the validation of an existing two-dimensional semi-analytical model developed under similar assumptions. The levels of entropy noise and acoustic scattering estimated using both methods are in good agreement. Two-dimensional effects on entropy noise are highlighted, notably by comparison with compact and 1D models. In addition, vorticity induced by the acceleration of entropy noise is evidenced, but it yields negligible vortex sound. Next, the focus is shifted to a 2D high-pressure turbine stator. The 2D model for nozzle flow is extended to this configuration, inheriting some of its main assumptions. Their investigation, using CAA in particular, sets the path for future developments and allows insight to be gained into the role of both vorticity and azimuthal variation of acoustics, which are neglected by the model. CAA also allows to characterise entropy noise generation in 2D stator flow under simplifying assumptions, using Euler and RANS mean flows. Further investigation is needed to validate the RANS case and to fully understand the effect of boundary layers on entropy noise generation. Finally, entropy noise is simulated using Zonal Detached Eddy Simulation (ZDES) in a stator channel in order to investigate 3D and viscous effects on entropy noise. The three-dimensionality of the flow is highlighted and acoustic signals are carefully post-processed, ensuring hydrodynamic perturbations are correctly filtered and boundary reflections are minimised. The closeness of noise levels obtained using CAA and ZDES suggest three-dimensional and viscous effects have a limited impact on the entropy noise generated in turbine stator flow
Noiray, Nicolas. "Analyse linéaire et non-linéaire des instabilités de combustion : application aux systèmes à injection multipoints et stratégies de contrôle." Châtenay-Malabry, Ecole centrale de Paris, 2007. http://www.theses.fr/2007ECAP1049.
Combustion instabilities induced by resonant acoustic-flame coupling occur in manypractical systems and cause severe difficulties and in extreme cases provoke failure or catastrophic damage. In most cases, the combustion process and the flow field are coupled by the system acoustic modes yielding strong oscillations of the flow and release of heat within the system. The problem has been extensively investigated over a number of years and a considerable amount of information has been gathered on the basic driving and coupling mechanisms. The present thesis aims at answering some of pending questions by combining systematic experiments, with theoretical modeling and numerical simulation. Theoretical developments are devised to model the physical phenomena encountered in the experimental layout. Numerical simulations are also used to complement the experimental and analytical work. The important results of this work are : (1) The nonlinear framework relying on the flame describing function (FDF). This constitutes a substantial progress in the understanding of mechanisms yielding limit cycles and of other nonlinear processes such as hysteresis or instability triggering, which are commonly observed in combustion applications. (2) the original passive control strategy which was developped and uses a dynamical phase converter (DPC) to reduce the sensitivity of the flame collection to incident perturbations (patent has been filed on this basis)
Leyko, Matthieu. "Mise en œuvre et analyse de calculs aéroacoustiques de type SGE pour la prévision du bruit de chambres de combustion aéronautiques." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0082/document.
An important part of the noise generated by aero-engines is caused by the combustion. To decrease this source of noise, a precise comprehension of the underlying phenomenon is required. Two different mechanisms generating noise in aero-engines because of the combustion have been identified in the 1970’s: the direct mechanism that is directly related to the unsteady heat release, and the indirect one that is caused by the interactions between the turbine stages and the temperature fluctuations also produced by the combustion. Analytical methods and numerical simulations are used here both to show the importance of the indirect combustion noise compared with the direct one, and to provide some validity limits of compact nozzles analytical approaches. Three different configurations dealing with indirect noise are investigated: quasi-1- D nozzle, axisymmetric 2-D nozzle and 2-D turbine blade. Finally, an actual 3-D combustion chamber sector (SNECMA) is addressed with Large-Eddy Simulation. Fluctuations at the outlet of the combustor are used to compute the overall noise caused by the combustion (direct and indirect), by means of the investigated analytical models
Schuller, Thierry. "Mécanismes de couplage dans les interactions acoustiques-combustion." Phd thesis, Ecole Centrale Paris, 2003. http://tel.archives-ouvertes.fr/tel-00250137.
Letaïef, Nathalie. "Distinction bruit/chaos apppliquée à l'étude d'un lit fluidisé bouillonnant." Rouen, 1994. http://www.theses.fr/1994ROUES004.
Gazon, Matthieu. "Impact des caractéristiques de l'injection sur les processus à l'origine des fluctuations cycle à cycle du bruit de combustion d'un moteur diesel." Rouen, 2008. http://www.theses.fr/2008ROUES052.
Due to the actual standards and environmental conditions, the car manufacturers have to think about the problem of pollutant emissions. But, to better control the environment, the local authorities are more and more interested in the acoustic emissions of vehicles. The problematic of this study is based on an observation made on a Diesel engine : important cycleto-cycle fluctuations (leading to unpleasant perception) can appear at low engine speed and low charge (brake mean effective pressure). This is a significant problem since such engine operating conditions are representative of the urban driving (repetitive stops, low-speed circulation,. . . ). This study has been made to try to answer the question : are fluctuations in injection system responsible for fluctuations in the combustion and in the combustion noise ? The experimental study presented here is based on two experimental devices. Experiments conducted on an engine test-bench allowed to characterize the combustion and the combustion noise. An injection test-bench was also used to characterize the injection system behavior in conditions close to the engine ones. The experiments on this setup led to a model for the determination of the injected fuel mass and its cyclic fluctuations. A simultaneous characterization of the injection system (injector command, injection pressure,. . . ) and of the combustion process (cylinder pressure, rate of heat release, combustion noise,. . . ) was conducted. The model for the injected fuel mass estimation has been applied to the data acquired on the engine test-bench. For the studied engine, the results show that the link between the combustion noise and the injection system if it exists, remains weak
Truffaut, Jean-Marie. "Étude expérimentale de l'origine du bruit émis par les flammes de chalumeaux." Phd thesis, Université de Provence - Aix-Marseille I, 1998. http://tel.archives-ouvertes.fr/tel-00011688.
Drouet, Julie. "Séparation des sources de bruit des moteurs Diesel : Application en hiérarchisation de source et qualité sonore." Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0053/document.
The spectrofilter is a Wiener filter used to extract combustion noise. This filter requires an important data processing and is determined in all operating conditions. Thus it is difficult to carry out perceptual studies on combustion noise from various motor adjustments. To overcome this drawback, this PhD dissertation aims to define a common filter which can synthesize a combustion noise in all operating conditions. For this, a perceptual study showed that the substitution of the conventional spectrofilter by another Wiener filter allows the synthesis of a combustion noise. The use of a common spectrofilter is thus possible. The experimental modal analysis allows to estimate the Wiener filter from characteristic data of the engine structure. After studying on a synthetic signal, the ESPRIT method seems to be the most appropriate, but requires some optimizations to be adapted to spectrofilter peculiarities. The Wiener filters of several running speeds are estimated in different estimating conditions, defined by the ESTER criterion. A fictitious damping evolution with the running speed is observed and linked to the temporal windowing applied on the spectrofilter computation. A perceptual experience is then carried out to identify if the ESTER criterion allows to estimate accurately filters to synthesize combustion noises similar to conventional combustion noises. The results lead to conceive the spectrofilter obtained in idling condition as a good common filter, as in a physical point of view that perception
Guyader, Gaël. "Modélisations temporelles simplifiées des phénomènes physiques à l'origine du bruit moteur : dédiées au portage temps réel et aux applications de design sonore." Lyon, INSA, 2003. http://www.theses.fr/2003ISAL0018.
Noise levels are well controlled in the car industry but a new step is pointing out: the sound design one aiming to make noise pleasant even bringing either sense or sensations, and no longer aiming to reduce noise. Sound design action must begin with source characterization for the intern combustion engine. The proposed sound synthesis procedure supplies an analysis tool to study engine noise quality in function of technical characteristics. Generated noises are described by two approaches, one of them being a global one and the other one being a physical one. After reminding engine functioning basis, two noise groups are defined from the combustion cycle. The first one concerns noise generated by Vibrations and the second one deals with aéroacoustic sources. Two methods dealing with an acoustic radiation assessment are presented and then faced to measurements. Finally a perceptive test has checked the realism of the model, comparing it with measurements
Taghavi-Nejad, M. H. "Caractérisation, par les méthodes de cohérences, de sources de vibrations et de bruit d'un moteur diesel." Compiègne, 1986. http://www.theses.fr/1986COMPS142.
Laverdant, Alain. "Contribution à l'étude des instabilités de combustion des foyers aérobies." Rouen, 1991. http://www.theses.fr/1991ROUE5021.
Roux, Sébastien. "Influence de la modélisation du mélange air/carburant et de l'étendue du domaine de calcul dans la simulation aux grandes échelles des instabilités de combustion : application à des foyers aéronautiques." Phd thesis, Toulouse, INPT, 2007. http://oatao.univ-toulouse.fr/14175/1/roux_sebastien1.pdf.
Fei, Binjun. "Comportement dynamique et rayonnement acoustique d'une culasse de moteur diesel." Paris, CNAM, 1986. http://www.theses.fr/1986CNAM0076.
Lapeyre, Corentin. "Numerical study of flame stability, stabilization and noise in a swirl-stabilized combustor under choked conditions." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/14493/1/Lapeyre.pdf.
Le, Helley Philippe. "Etude théorique et expérimentale des instabilités de combustion et de leur contrôle dans un brûleur laminaire prémélangé." Châtenay-Malabry, Ecole centrale de Paris, 1994. http://www.theses.fr/1994ECAP0369.
Motheau, Emmanuel. "Accounting for mean flow effects in a zero-Mach number thermo-acoustic solver : application to entropy induced combustion instabilities." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2013. http://tel.archives-ouvertes.fr/tel-00983655.
Bédat, Benoît. "Contribution à l'étude expérimentale aérothermoacoustique d'une flamme prémélangée turbulente dans un environnement non confiné." Toulouse, ENSAE, 1992. http://www.theses.fr/1992ESAE0006.
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