Sound propagation in narrow tubes including effects of viscothermal and turbulent damping with application to charge air coolers

Knutsson, Magnus; Åbom, Mats

doi:10.1016/j.jsv.2008.07.006

Cited by 15 publications

(5 citation statements)

References 29 publications

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“…This approach is also applied to additional devices found in the breathing system of internal combustion engines, which have an impact on the control of acoustic emissions as well: catalytic converters [2][3][4], particulate filters [4,5] and charge air coolers [6].…”

Section: Introductionmentioning

confidence: 99%

Acoustic modelling of exhaust devices with nonconforming finite element meshes and transfer matrices

et al. 2012

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Elsevier Denia, FD.; Martínez-Casas, J.; Baeza, L.; Fuenmayor, FJ. (2012). Acoustic modelling of exhaust devices with nonconforming finite element meshes and transfer matrices. Applied Acoustics. 73 (8) ABSTRACTTransfer matrices are commonly considered in the numerical modelling of the acoustic behaviour associated with exhaust devices in the breathing system of internal combustion engines, such as catalytic converters, particulate filters, perforated mufflers and charge air coolers. In a multidimensional finite element approach, a transfer matrix provides a relationship between the acoustic fields of the nodes located at both sides of a particular region. This approach can be useful, for example, when one-dimensional propagation takes place within the region substituted by the transfer matrix. As shown in recent investigations, the sound attenuation of catalytic converters can be properly predicted if the monolith is replaced by a plane wave four-pole matrix. The finite element discretization is retained for the inlet/outlet and tapered ducts, where multidimensional acoustic fields can exist. In this case,

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Section: Introductionmentioning

confidence: 99%

Acoustic modelling of exhaust devices with nonconforming finite element meshes and transfer matrices

et al. 2012

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“…A number of authors have studied acoustic modeling for air intake parts, using various simulation and measurement techniques. Knutsson et al [18] used 3D CFD calculations for a charge air cooler to derive acoustic transfer matrices for this complicated geometry. Tikoja [19] presented a measurement technique for identifying the transfer matrix of a turbocharger.…”

Section: Figure 1 -Turbocharged Engine Architecturementioning

confidence: 99%

Coupling a Linear Pressure and Mass Flow Frequency Model Obtained From Measurements at the Intake of an IC Engine With a Non-Linear Time Domain Code

Mezher

Chalet

Migaud³

2014

Volume 1: Applied Mechanics; Automotive Systems; Biomedical Biotechnology Engineering; Computational Mechanics; Design; Digital

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Engine simulation software has become synonymous with automotive design and component development. An integral part of any engine simulation is the correct modeling of the air flow at the intake. This air flow, which is highly compressible and unsteady, has a first order influence on the trapped air mass inside the cylinder and therefore on the behavior of the engine (torque response and emissions). The non-linear modeling of the air paths at the intake is done using a space-time meshing and by solving the 1D equations with a proper time scheme. Such methods are the bases of today’s engine simulation codes [1]. The main constraint with these methods is the time needed to model complex geometries, whether being the simulation time or the time spent on calibrating the said models with experimental measurements. These complicated geometries become problematic to accurately predict, particularly the charge air cooler (CAC) which is responsible for cooling the air flow on a turbocharged engine. Another approach is to use frequency domain models to describe the fluctuating pressure and mass flow [2]. Although this approach is simpler, faster in terms of computing time and offers many experimental techniques to characterize complicated geometries; important limitations can appear when it is confronted to the effects of high pressure levels and pulsating mass flow. Furthermore, the models behind such methods are designed to be used in the frequency domain, contrary to an engine simulation that works solely with time domain variables. In this article, a linear frequency domain model known as a transfer matrix is used. This concept is nothing new in acoustics; however here it was developed by experimentally measuring the transfer matrix [3] for a simple tube on a dedicated bench under conditions similar to those encountered on an engine [4]. The approach is then extended to measure the transfer matrix of a charge air cooler (CAC) on a real engine test bench. The measured discrete transfer matrix, defined in terms of fluctuating pressure and mass flow, is then transformed to a continuous frequency model and coded in Simulink®. The latter is coupled to the non-linear engine simulation software GT-Power®. The objective is to accurately model the pressure and mass flow of a complicated geometry using experimental measurements and a linear frequency model then to couple the transfer matrix to an engine simulation code, thus replacing the need for a meshed model.

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“…This two-port modeling has been employed extensively by a large number of authors. Knutsson and Abom 19 studied sound propagation in CACs where a method for extracting a multi-port transfer matrix from numerical 3D finite elements has been derived and presented. Portier and Leandre 20 give an experimental setup for transfer matrix determination of a turbocharger written in terms of pressure and volumetric mass flow.…”

Section: Introductionmentioning

confidence: 99%

Wave dynamics measurement and characterization of a charge air cooler at the intake of an internal combustion engine with integration into a nonlinear code

Mezher

Chalet

Migaud³

et al. 2014

International Journal of Engine Research

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There exist two fundamental tools for modeling and simulating wave action of internal combustion engines. The first is a nonlinear time domain solution of the Euler equations using a space-time meshing. The second is a frequency domain solution of the linear wave equations. These two methods exist with a wide range of complexity and sophistication. Hybrid coupled methods also exist; they attempt to bridge the gap between the two techniques while maintaining the overall goal of engine simulation in mind. This work deals with the frequency characterization of a complex intake element, the charge air cooler. First, a transfer matrix for a simple tube is defined and measured. Two identical versions of the previous tube serve for identifying the transfer matrix of the charge air cooler directly on an operating four-cylinder turbocharged engine. Once the transfer matrix is measured, it is coupled to GT-Power as four transfer functions coded into Simulink. The final validation comprises two tubes in GT-Power with measured boundary conditions of pressure and mass flow with the Simulink model in between. Results are presented in the time and frequency domains with future objectives and perspectives as well.

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Sound propagation in narrow tubes including effects of viscothermal and turbulent damping with application to charge air coolers

Cited by 15 publications

References 29 publications

Acoustic modelling of exhaust devices with nonconforming finite element meshes and transfer matrices

Acoustic modelling of exhaust devices with nonconforming finite element meshes and transfer matrices

Coupling a Linear Pressure and Mass Flow Frequency Model Obtained From Measurements at the Intake of an IC Engine With a Non-Linear Time Domain Code

Wave dynamics measurement and characterization of a charge air cooler at the intake of an internal combustion engine with integration into a nonlinear code

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