Complex geometry automotive muffler sound transmission loss measurement by experimental method and 1D simulation correlation

Mohammad, Mahadhir; Said, Mohd Farid Muhamad; Khairuddin, Muhammad Hariz; Kadir, M. K. A.; Dahlan, M. A. A.; Zaw, Thiha

doi:10.1088/1757-899x/884/1/012098

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…Helmholtz resonator and pointed out that it can get good attenuation properties at three frequency harmonics of hydraulic flow pulsation. [23] Considering that the energy of hydraulic flow pulsation mainly distributes at the fundamental frequency and its first two harmonics. Fig.…”

Section: Fig 1 Structure Of Three 1-dof Helmholtz Resonatormentioning

confidence: 99%

Enhancement of Low-Frequency Noise for Muffler by Optimizing the Space between Three 1-Degrees of Freedom Helmholtz Resonator

Jatola,

Gupta

2024

MATEC Web Conf.

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The Helmholtz resonator is one of the basic elements to attenuate low-frequency noise and increase sound transmission loss in a muffler for particular low frequency zone. It can be enhancing the performance without any change in the geometry of the muffler. It can greatly reduce the high-intensity noise in low-frequency zones. A comparative study has been carried out by implementing the two and three resonators arranged in series arrangement at optimum spacing for increasing transmission loss. The model of Helmholtz resonator at wavelength 1000 mm at different spacing like (closely spaced: -(4), 1stantinode: -(4) and 1st node: -(2) ) were prepared by using wave build 3-D and simulating above condition on wave 1-D module. This work is also validated by simulating the same geometry on Comsol tool for the mentioned spacing. This attempt gives a comparative study about perfect spacing during use of more than one resonator in a series. The neck and cavity ratio are taken as 2 and 1.85 respectively for the modelling of an identical resonator. The Conclusion shows that, at (4) resonator gives the maximum attenuation at 340 Hz cut-off frequency in low-frequency zone.

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Section: Fig 1 Structure Of Three 1-dof Helmholtz Resonatormentioning

confidence: 99%

Enhancement of Low-Frequency Noise for Muffler by Optimizing the Space between Three 1-Degrees of Freedom Helmholtz Resonator

Jatola,

Gupta

2024

MATEC Web Conf.

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“…Kalita and Singh studied in [11] the prediction of TL based on ANSYS software. Mohammad et al developed in [12] an experimental setup to measure the muffler TL using an impedance tube and 1D simulation. In his thesis [13], Olgar developed TMM and finite element modeling (finite element method-FEM) to predict the TL for industrial machinery.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Using a Modified Transfer Matrix Method for an Automotive Exhaust Muffler Design Based on Computation Fluid Dynamics in 3D

Bugaru,

Vasile

2024

Computation

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The present work aims to investigate the newly modified transfer matrix method (MTMM) to predict an automotive exhaust muffler’s transmission loss (AEMTL). The MTMM is a mixed method between a 3D-CFD (Computation Fluid Dynamics in 3D), namely AVL FIRETM M Engine (process-safe 3D-CFD Simulations of Internal Combustions Engines), and the classic TMM for the exhaust muffler. For all the continuous and discontinuous sections of the exhaust muffler, the Mach number of the cross-section, the temperature, and the type of discontinuity of the exhaust gas flow were taken into consideration to evaluate the specific elements of the acoustic quadrupole that define the MTMM coupled with AVL FIRETM M Engine for one given muffler exhaust. Also, the perforations of intermediary ducts were considered in the new MTMM (AVL FIRETM M Engine linked with TMM) to predict the TL (transmission loss) of an automotive exhaust muffler with three expansion chambers. The results obtained for the TL in the frequency range 0.1-4 kHz agree with the experimental results published in the literature. The TMM was improved by adding the AVL FIRETM M Engine as a valuable tool in designing the automotive exhaust muffler (AEM).

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“…In a hybrid muffler, Horoub investigated the results of joining tapered expansion chambers of various sizes (Guhan et al, 2018). Computational fluid dynamics (CFD) tests on these connected expansion chambers revealed that extensions on baffles decreased the pressure drop within the silencer in comparison to a single expansion chamber of comparable size (Mohammad et al, 2020). The transfer matrix representation, which has been extensively utilised in the past to assess and quantify the acoustical characteristics of flow system components, serves as the foundation for the mathematical formulation (Muhammad et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Enhancing Sound Transmission Loss in Hybrid Mufflers with Change in Pipe Perforation and Using Absorptive Material

Jatola,

Gupta

2023

IJERR

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It is well known that baffled exhaust mufflers enhance sound transmission loss while lowering noise emissions. Sound transmission loss can be further reduced by adding sound-absorbing material inside the silencer. It has been demonstrated that carefully placed baffles in exhaust silencer systems improve acoustic performance by successfully lowering noise emissions. Sound waves are redirected and disrupted by baffles, which lessens the transmission of undesired noise and creates a more controlled and tranquil acoustic environment. The incorporation of sound-absorbing materials into mufflers is a significant development in noise control technology. Specialized materials are added to the muffler to improve sound wave absorption and drastically reduce noise emissions. This novel method not only enhances acoustic performance but also improves a variety of applications—from industrial gear to automobile exhaust systems—making them quieter and more enjoyable to use. A silencer was constructed for this research project using the finite volume method. The design's efficacy was demonstrated through experimental validation. The research project then used the finite volume technique to produce a silencer with the same dimensions. It then adjusted the design based on different flow percentages, adding a baffle and making pipe perforations, until the optimal silencer design was found. Additionally, this approach provides an optimal design and indicates which sound-absorbing material has the largest sound transmission loss.

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Complex geometry automotive muffler sound transmission loss measurement by experimental method and 1D simulation correlation

Cited by 4 publications

References 11 publications

Enhancement of Low-Frequency Noise for Muffler by Optimizing the Space between Three 1-Degrees of Freedom Helmholtz Resonator

Enhancement of Low-Frequency Noise for Muffler by Optimizing the Space between Three 1-Degrees of Freedom Helmholtz Resonator

Recent Developments in Using a Modified Transfer Matrix Method for an Automotive Exhaust Muffler Design Based on Computation Fluid Dynamics in 3D

Enhancing Sound Transmission Loss in Hybrid Mufflers with Change in Pipe Perforation and Using Absorptive Material

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