Design of Reactive Rectangular Expansion Chambers for Broadband Acoustic Attenuation Performance based on Optimal Port Location

Mimani, A.; Munjal, ML

doi:10.1007/s40857-016-0053-8

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…Finally, using the definitions ( 21), (23), and (35), of 𝜒 ± n , R m,n , T m,n , and V ± 𝑗 , we get the expression (34).…”

Section: How To Cite Thismentioning

confidence: 99%

“…The considered configuration is a simple model of waveguide structures with a flexible expansion chamber having a rectangular cross-section. It allows us to analyze the role of bridging-height discontinuities, flexible walls, and specific edge connections on the scattering of waves through similar structures, such as expansion chamber mufflers with rectangular cross-sections and compliant walls [34,35].…”

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confidence: 99%

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Acoustic scattering from a wave‐bearing cavity with flexible inlet and outlet

Afzal,

Bilal,

Ahmed

et al. 2023

Math Methods in App Sciences

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In this article, we substantiate the appositeness of the mode‐matching technique to study the scattering response of bridging elastic plates connecting two flexible duct regions of different heights. We present two different solution schemes to analyze the structure‐borne and fluid‐borne radiations in the elastic plate‐bounded waveguide. The first scheme supplements the mode‐matching technique with the so‐called tailored‐Galerkin approach that uses a solution ansatz with homogeneous and integral parts corresponding to the vibrations of the bridging elastic plate and the cavity, respectively. In the second scheme, we supplement the mode‐matching technique with the modal approach wherein the displacement of the bridging elastic plate is projected onto the eigenmodes of the cavity. To handle the non‐orthogonality of the eigenfunctions, we invoke generalized orthogonality relations. An advantage of the proposed mode‐matching schemes is that they provide a convenient way of incorporating a variety of edge conditions on the joints of the plates, including clamped, pin‐joint, or restraint connections. The numerical analysis of the waveguide scattering problems substantiates that edge connections on the joints have a significant impact on the scattering energies and transmission loss. Furthermore, it appears that the transmission loss and structural vibration attenuation in the expansion chamber may be improved by adjusting chamber dimensions and excitation modes.

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“…Finally, using the definitions ( 21), (23), and (35), of 𝜒 ± n , R m,n , T m,n , and V ± 𝑗 , we get the expression (34).…”

Section: How To Cite Thismentioning

confidence: 99%

mentioning

confidence: 99%

Acoustic scattering from a wave‐bearing cavity with flexible inlet and outlet

Afzal,

Bilal,

Ahmed

et al. 2023

Math Methods in App Sciences

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“…Zhu et al studied a new type of semiactive muffler based on an H-Q pipe to control the low-frequency noise of the exhaust pipe [7]. Mimani et al analyzed the transmission loss performance of the rectangular expansion chamber with a single inlet and single outlet and single inlet and double outlet by using the three-dimensional semi-analytic formula based on the modal expansion method and Green's function method [8]. Meriç et al designed a resonator system with a helical side branch duct to control broadband noise [9].…”

Section: Introductionmentioning

confidence: 99%

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

et al. 2022

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The exhaust tailpipe of a certain type of tractor was improved from the perspective of bionics, and bionic triangular convex texture was added to the inner surface of the exhaust tailpipe. The bionic tailpipe was proposed to improve noise reduction performance without changing the overall size parameters of the prototype tailpipe. Acoustics simulation software was used to predict the aeroacoustics noise and transmission loss of the exhaust tailpipe. Bionic exhaust tailpipes with triangular textures of different numbers of circumferential columns, height, and top angles were analyzed to study the noise reduction performance. The results showed that the proposed bionic exhaust tailpipes with triangular convex textures reduced the total sound pressure level and improved the transmission loss of the prototype exhaust tailpipe. To increase the transmission loss, a genetic algorithms (GA) optimized back-propagation neural network (BP) was used to optimize the bionic triangular convex texture parameters. By studying the aerodynamic noise reduction mechanism of bionic tailpipes, the research suggested that a secondary vortex appeared near the bionic texture and reduced aerodynamic drag and aeroacoustics noise. In addition, the sound pressure level amplitude nephogram, velocity vector nephogram, and velocity amplitude nephogram of the exhaust tailpipes were analyzed to study the vibration noise reduction mechanism of the bionic tailpipes. Then, the noise reduction performance was experimentally evaluated. The experimental results of the bionics exhaust tailpipes with triangular convex textures were analyzed and compared to that of the prototype tailpipe. The results demonstrated that the bionic exhaust tailpipes were able to attenuate noise.

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“…e muffling mechanism of these mufflers has been investigated in the literature [7][8][9][10][11][12]. If lowfrequency noise has to be eliminated, the expansion chamber of this type of muffler has to be long, requiring a large muffler.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study on the Transmission Loss of a Side Outlet Muffler

Zhang

Shi

Zeng

et al. 2020

Shock and Vibration

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Vibration and noise reduction methods are important research directions in many industries. Mufflers are widely used in pipelines to reduce noise and vibration transmission. A theoretical analysis is conducted to determine the noise reduction mechanism of a muffler with a side outlet, and the results are verified with experiments. The quadrupole parameters of the muffler are obtained using transfer matrix analysis, and sensitivity analysis of the quadrupole parameters is conducted. The influence of the side outlet location on the transmission loss of the muffler is investigated experimentally using an impedance tube. The key factors affecting the transmission loss are analyzed. The theoretical calculation results of the transmission loss of the side outlet muffler are in good agreement with the experimental results.

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Design of Reactive Rectangular Expansion Chambers for Broadband Acoustic Attenuation Performance based on Optimal Port Location

Cited by 5 publications

References 38 publications

Acoustic scattering from a wave‐bearing cavity with flexible inlet and outlet

Acoustic scattering from a wave‐bearing cavity with flexible inlet and outlet

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

Theoretical and Experimental Study on the Transmission Loss of a Side Outlet Muffler

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