Optimal topology of reactive muffler achieving target transmission loss values: Design and experiment

Lee, Jin Woo

doi:10.1016/j.apacoust.2014.08.005

Cited by 48 publications

(22 citation statements)

References 32 publications

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“…The author [22] use an acoustical topology optimization for a partition volume minimization problem achieving high value transmission loss through muffler. Authors [23] used Computational Fluid Dynamics (CFD) methods for simulation of acoustic pulse in muffler and develop a full compressible Navier-Stokes solution algorithm for acoustic propagation problems.…”

Section: Flow Distributionmentioning

confidence: 99%

A Review of Flow Acoustic Effects on a Commercial Automotive Exhaust System

Mohamad¹

2019

MVM

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Acoustic simulation methods are being increasingly used for practical exhaust system design of automotive. In many practical applications, the sound source emits, partly, a low frequency sound spectrum comprised of superposed discrete tones and partly, a higher frequency broadband spectrum. The turbulent vortices that develop in the boundary layer between the duct wall and the flowing medium are said to generate a selfexcited noise, that noise is broadband character. The self-excitation is enhanced when the flow is disturbed by irregularities in the duct wall. Unsteady compressible fluid flow through a duct is often encountered in many engineering applications and has been investigated by many researchers. When a pressure wave generated inside a duct is discharged from an open end of the duct, an impulsive wave that is usually characterized by high sound pressure level of short duration forms at the vicinity of the exit of the duct. Acoustic simulations solve the equations for motion, mass, momentum, and energy and can be divided into two methods, linear and non-linear. Through that literature review, we can analyse the methods and the latest development done on exhaust systems with regard to acoustic performance. The basic theory behind both approaches is explained as well as a source characterization technique that can be used to link the two methods. Some acoustic software tool has been applied to a variety of exhaust systems.

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Section: Flow Distributionmentioning

confidence: 99%

A Review of Flow Acoustic Effects on a Commercial Automotive Exhaust System

Mohamad¹

2019

MVM

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“…When equations (13) and (14) are combined, the parameters A 23 , B 23 , C 23 and D 23 can be obtained. The experimental TL of the resonator can be expressed as…”

Section: Tl Measurement Of Resonatorsmentioning

confidence: 99%

“…Furthermore, Chang et al 13 optimized the design of perforated resonators using a neural network and a genetic algorithm. Lee 14 proposed and experimentally validated a design method for a reactive resonator, which is based on topology optimization. These algorithms did not consider detailed parameters such as the perforation rate of each chamber.…”

Section: Introductionmentioning

confidence: 99%

Acoustic performance and flow analysis of a multi-chamber perforated resonator for the intake system of a turbocharged engine

Guo

Tang

Zhu

2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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A multi-chamber perforated resonator is a type of silencer which can attenuate broadband noise. In order to address the noise issues originating from the intake system of a turbocharged engine, measurement tests are carried out to characterize the range and the amplitudes of the noise frequencies. A transfer matrix method and a non-linear least-squares optimization algorithm are combined in order to design the multi-chamber perforated resonator. A transmission loss test facility is designed on the basis of the two-load method so as to validate the acoustic performance of the resonator. Despite the difference between the amplitude of the transmission loss from the tests and the amplitude of the transmission loss obtained by the transfer matrix method, the shapes of the two curves have the same trend, and the measured transmission loss can meet the design target in the frequency range of interest. From the comparison between the intake noise spectrum with the resonator and the intake noise spectrum without the resonator, it can be seen that this resonator can efficiently attenuate the broadband intake noise of the engine. Also, a computational fluid dynamics flow simulation analysis of the intake system with the resonator is made so that its flow characteristics can be studied. The simulation results show that the air pressure drop of this resonator is slightly higher than that of the straight pipes but is still relatively low. It is also noted that the diameter and the curvature of the pipes have a great influence on the air velocity as well as on the pressure drop.

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“…The new formulat ion demands a lower volu me of part ition than the previous formulat ion which is much preferred. A mong the numerical issues of applying this to 3-D design problems in acoustics, the difficult ies in selecting the volume of part itions before optimization was overrun and proved experimentally [18].…”

Section: ''""mentioning

confidence: 99%

Energy Efficient Design and Modification of an Automotive Exhaust Muffler for Optimum Noise, Transmission loss, Insertion loss and Back pressure: A Review

George

Raj

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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This review paper showcases the various kinds of practical muffler designs available and attempted by several researchers and pioneers in muffler designing. The various design methodologies, design principles and lead factors that they have considered while designing is explained in this paper. The objective behind this study is to have a satisfactory knowledge about the various elements that comes into being when muffler designing is put forth to practice. The transmission loss and backpressure of the exhaust muffler, has been the key factor of consideration in most of the works done by the researchers as these have a direct impact on the engine performance, exhaust noise attenuation and finally fuel efficiency of the engine.

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Optimal topology of reactive muffler achieving target transmission loss values: Design and experiment

Cited by 48 publications

References 32 publications

A Review of Flow Acoustic Effects on a Commercial Automotive Exhaust System

A Review of Flow Acoustic Effects on a Commercial Automotive Exhaust System

Acoustic performance and flow analysis of a multi-chamber perforated resonator for the intake system of a turbocharged engine

Energy Efficient Design and Modification of an Automotive Exhaust Muffler for Optimum Noise, Transmission loss, Insertion loss and Back pressure: A Review

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