Acoustic behaviour analysis and optimal design of a multi-chamber reactive muffler

Xiang, Ling; Zuo, Shuguang; Wu, Xudong; Zhang, Jun; Liu, Jingfang

doi:10.1177/0954407016630112

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…Figure 8 shows the comparison between the TL results obtained by numerical simulation and experimental tests of the corrugated pipe C 1 and C 2 . As seen from Figure 8, although the simulation results and the experimental results are slightly different at certain frequencies, the two are in good agreement with each other, which is consistent with the experimental results of Jones and Kessissoglou, 32 Siano et al, 33 Chu et al, 34 and Xiang et al 35 Therefore, it verifies the reliability and accuracy of the TL of U-shaped corrugated pipe obtained by the acoustic FEM.…”

Section: Analytical Model and Verificationsupporting

confidence: 86%

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Xue

Sun

Jiao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents a numerical study on the effect of structural parameters on acoustical transmission loss of U-shaped corrugated pipe using the control variable method. Then, the interactions between the cutoff frequencies and structural parameters are modeled based on the dimension analysis method using the numerical results. An investigation into the application of the U-shaped corrugated pipe into a simple expansion chamber muffler is carried out using both numerical and experimental methods. The results show that the U-shaped corrugated pipes have unique acoustic characteristics in noise attenuation, which resembles a resonant muffler. Furthermore, the numerical results of the transmission loss of U-shaped corrugated pipes are in good agreement with experimental results, which indicates that the transmission loss results obtained by acoustic finite element method is accurate. In addition, the corrugation height, corrugation length, and corrugation internal diameter are the factors that affect the acoustical behavior of the corrugated pipe most significantly. Moreover, the proposed empirical formulas for predicting the cutoff frequencies of U-shaped corrugated pipes are verified with high accuracy and with a prediction error within ±3.0%. What is more, the application of U-shaped corrugated pipes in expansion chamber muffler can effectively reduce the noise in the mid- to high-frequency band, which is useful to reduce the muffler volume and the amount of sound-absorbing material. Hence, automobile mufflers can be designed in a much more environmentally friendly way. In conclusion, this work could provide a theoretical basis for the acoustical design of U-shaped corrugated pipes, and it initiates a new research and application field for corrugated pipes as well.

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Section: Analytical Model and Verificationsupporting

confidence: 86%

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Xue

Sun

Jiao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The muffler suitable for the excavator mainly consists of perforated pipes, insertion pipes, resonance cavities. The perforated pipe strongly affects the attenuation performance of the resonator [23]. Limited by finite volume for the engine nacelle and maintaining constant external muffler dimension requires little or no change in the length of the chambers [24]， [25].…”

Section: B Orthogonal Test Designmentioning

confidence: 99%

Local Structural Optimization Method Based on Orthogonal Analysis for a Resistant Muffler

Zhou

Xue

et al. 2021

IEEE Access

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A resistant muffler is the most direct and effective means of reducing exhaust noise from earthmoving equipment. Different types of construction machinery require different mufflers. Current muffler design is mostly experience-based, and there are blind spots in the design process. The optimization scheme must constantly be revised to achieve satisfactory noise reduction. The use of a large number of optimization schemes are wasteful in terms of both cost and time. Therefore, an effective and time-saving design method for muffler optimization is needed. An optimization approach, known as the "local structural optimization method for a resistant muffler", based on orthogonal analysis is proposed in this study to optimize the design of a resistant muffler with a complex structure. The results of an orthogonal analysis for a simulation of the muffler structure show that the muffler acoustic and aerodynamic performances are affected by the inlet pipe, outlet pipe, insertion pipe, cross-flow perforated pipe and other local structures, and the results are employed to determine the influence law for the transmission loss (TL) and the exhaust back pressure, considering the local structural parameters of the muffler. The method is applied to optimize the design of a muffler suitable for an excavator and verified by performing an installation test. The experimental results show that the improved designs reduces the exhaust noise by 5 dB and the exhaust back pressure by 0.6 kPa. The improved designs exhibit higher aerodynamic and acoustic performances than a muffler prototype, showing that the proposed method is accurate, effective and reliable. The proposed method considerably simplifies the design process and saves time and cost. This method provides theoretical guidance and an optimization process for the design of a muffler for construction machinery. INDEX TERMS resistant muffler with complex structure, orthogonal test, simulation analysis, optimization design.

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“…[3][4][5] In recent years, the transfer matrix method, three-dimensional analytical method, and finite element method (FEM) have been used on the acoustic performance of the muffler for a large number of studies. 6,7 Xiang et al 8 used transfer matrix method to analyze the acoustic characteristics of the multichamber muffler, and the analytical approach was validated by experimental results. Besides, the effects of several structural parameters on the transmission loss value were studied, including the radius of the baffle holes, the inlet and the outlet, as well as the lengths and the radius of the expansion chambers.…”

Section: Introductionmentioning

confidence: 99%

“…6,7 Xiang et al. 8 used transfer matrix method to analyze the acoustic characteristics of the multichamber muffler, and the analytical approach was validated by experimental results. Besides, the effects of several structural parameters on the transmission loss value were studied, including the radius of the baffle holes, the inlet and the outlet, as well as the lengths and the radius of the expansion chambers.…”

Section: Introductionmentioning

confidence: 99%

Muffler structure improvement based on acoustic finite element analysis

Zhang

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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Aiming to obtain the acoustic attenuation performance of exhaust muffler of diesel engine and the influence of main structural parameters on its acoustic attenuation characteristics, the finite element analysis method and acoustic theory were adopted to numerically investigate the acoustic attenuation performance under the boundary condition of acoustic adiabatic propagation and muffler wall. It suggested that the noise cancellation effect of muffler was poor at the middle and low frequency in range of 0-3000 Hz, and the transfer loss of muffler was basically 0 dB pass frequency at 1100 Hz. According to previous single-factor study experience, the structural factors, such as the expansion ratio, insertion length of outlet perforated pipe, the distance between the diaphragm and the front part of muffler, have influences on the acoustic performance of muffler at low frequency. Thus, they were taken as the starting point to study the influence of multiple interaction factors on the muffling performance by using orthogonal design method combined with the finite element analysis method. The influence degree of different structure parameters on the acoustic performance of muffler and the optimized structure parameters were obtained. Through the analysis on the acoustic characteristic of the optimized muffler, it indicated that the transmission loss of the improved muffler had significant increase in other frequency range except the range of 650-800 Hz and 2500-2700 Hz, especially at frequency of 1100 Hz compared with the original muffler. In the range of 0-3000 Hz, the mean of transmission loss of the improved muffler was about 9.8 dB larger than that of original muffler, which indicated that better noise cancellation effect was achieved. The improved muffler also provided a certain reference for the structural improvement of similar muffler.

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Acoustic behaviour analysis and optimal design of a multi-chamber reactive muffler

Cited by 10 publications

References 20 publications

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Local Structural Optimization Method Based on Orthogonal Analysis for a Resistant Muffler

Muffler structure improvement based on acoustic finite element analysis

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