Acoustic performance analysis of muffler by varying sound absorption materials

Kalita, Ujjal; Singh, Manpreet

doi:10.1016/j.matpr.2023.02.272

Cited by 11 publications

(6 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They found that the best acoustic material for automobile exhaust muffler is glass wool. They observed the same result again with the experimental setup they established [8]. Kalita and Singh determined four different models and performed acoustic analysis to optimize the exhaust muffler used in a 6000 RPM fourcylinder engine.…”

Section: Introductionmentioning

confidence: 56%

Numerical investigation of the thermal and acoustic effect of material variations on the exhaust muffler

Kepekçi,

Ağca

2024

International Journal of Automotive Engineering and Technologies

View full text Add to dashboard Cite

Exhaust mufflers are used in automobiles to prevent the noise arising from exhaust gases resulting from internal combustion engines. With the advancement of the automotive industry, exhaust mufflers have become more complex over time to reduce noise and increase driving comfort. Within the scope of this study, exhaust muffler geometries with different geometries have been designed, and harmonic acoustic analyses have been carried out. In the analysis, the airflow speed has been accepted as 30 m/s. Acoustic pressure and transmission loss data obtained because of analyses performed with 1Pa pressure input have been evaluated. As a result of the evaluations, it has been concluded that the muffler modeled in a complex structure has been better acoustically. Although the main task of exhaust muffler is to reduce the sound level at the exit of exhaust gases, it is also important to reduce the temperature of the air in the exhaust system and have good thermal conductivity so as not to jeopardize the thermal safety of the system. For this reason, CFD thermal flow analysis has been carried out with 4 different materials using a complex design with high acoustic efficiency. Gray cast iron, stainless steel, 1020 steel, and aluminum have been used as materials. In this part of the study, it has been determined that the use of aluminum material has been better in terms of thermal efficiency.

show abstract

Section: Introductionmentioning

confidence: 56%

Numerical investigation of the thermal and acoustic effect of material variations on the exhaust muffler

Kepekçi,

Ağca

2024

International Journal of Automotive Engineering and Technologies

View full text Add to dashboard Cite

show abstract

“…The main hypothesis of the study depends on the Sound Transmission Loss (TL), which is the main characteristic that can describe noise reduction in mufflers. TL is defined as the ratio in sound power level between the incident wave W i stimulating the mufflers and the transmitted wave W t to an anechoic termination, and it is independent of the source as per the following equation [13,14]:…”

Section: Object and Hypothesis Of The Studymentioning

confidence: 99%

Evaluating the impact of structure parameters on the acoustic performance of an exhaust muffler with shells

Mosa,

Putra,

Mahmood

2023

EEJET

View full text Add to dashboard Cite

Recently, environmental noise has arisen from various sources, such as those from exhaust mufflers of combustion engines found in cars, trucks, or power generators, which produce significant noise during their operation. Controlling the radiated noise from these mufflers is a major factor in improving acoustic comfort and minimizing the impact on the surrounding communities. Numerous research has been presented for this reason by modification of the internal structure of the exhaust muffler. The main objective of this work is to reduce the noise level emitted from exhaust mufflers. This can be achieved by adjusting structure parameters to attenuate the surrounding environment's radiated noise. Analysis of pressure-wave propagation has been done by building 3D models using COMSOL Multiphysics software. Different entities were conducted to investigate the influence of muffler shells and plate thicknesses on acoustic performance through the frequency domain to obtain better attenuation. SPL over a frequency band is presented, describing how the sound intensity varies at different frequencies within a given bandwidth. The results showed that increasing the muffler shell thickness improved the TL; this particularly causes a double value at a range above 1.2 kHz, where there are two distinct peaks at 1.3 kHz and 2.8 kHz. Additionally, it was found that increasing the muffler plate thickness reduces the TL whole range and moves the curve peak to higher frequencies. This is because the pressure pulses that stimulate the shell plates would exert a more distinct influence on plates characterized by a reduced thickness, and the muffler structure thickness is correlated with its increased stiffness, resulting in an elevation of the frequency for this eigenmode

show abstract

“…Terashima [9] utilized a finite element approach to evaluate sound transmission loss in perforated silencers, concluding that discrepancies in sound transmission loss results may be attributed to the viscous effects of sound wave propagation and geometric imperfections. Kalita and Singh [10] performed an acoustic performance analysis of absorption materials used in sound attenuators, concluding that a type of glass wool (with a density of 24 kg/m³ and flow resistivity of 14,000 Pa s/m²) inserted in a muffler yielded the best transmission loss compared to rock wool, polyester, or melamine. Experiments with parallel baffled mufflers and perforated panels were conducted by Xiaowan [11], who created a testing stand and studied the transmission loss for various panel configurations.…”

Section: Introductionmentioning

confidence: 99%

Evaluating of Noise Reduction Techniques for Turboengine Test Stands: A Preliminary Analysis

Cristea,

Deaconu

2024

Preprint

View full text Add to dashboard Cite

Emphasizing the importance of acoustic attenuation in maintaining compliance with stringent noise regulations and enhancing workplace safety, the analysis covers the theoretical and practical aspects of sound attenuation in a turboengine testing stand. This paper presents a preliminary analysis and also an evaluation of a procedure for projecting a noise attenuator for industrial application and especially for turboengine test stands. While primarily focusing on the static acoustic behavior of the attenuator, considerations were also made regarding flow dynamics, Mach number-dependent attenuation, pressure drop, and self-generated noise aspects to provide a comprehensive perspective in selecting the optimal design configuration. The study investigates different calculation methods for assessment of the noise reduction for linear and staggered baffles, applied on a scaled reduced model of attenuator. Thus, the critical parameters and projecting requirements necessary for effective noise reduction in high-performance turboengine testing environments will be evaluated in a down-scaled model. Key factors examined include the selection of design parameters and configurations from various options. Advanced computational methods, like analytic and finite element analysis (FEM) are utilized to predict the acoustic performance and identify potential design optimizations. Experimental validation is performed to corroborate the simulation results, ensuring the reliability and efficiency of the attenuator. The findings indicate that a well-designed sound attenuator module can significantly reduce noise levels without compromising the operational performance of the turboengine inside a test cell.

show abstract

Acoustic performance analysis of muffler by varying sound absorption materials

Cited by 11 publications

References 11 publications

Numerical investigation of the thermal and acoustic effect of material variations on the exhaust muffler

Numerical investigation of the thermal and acoustic effect of material variations on the exhaust muffler

Evaluating the impact of structure parameters on the acoustic performance of an exhaust muffler with shells

Evaluating of Noise Reduction Techniques for Turboengine Test Stands: A Preliminary Analysis

Contact Info

Product

Resources

About