Experimental study on the comprehensive performance of the application of U-shaped corrugated pipes into reactive mufflers

Xue, Fei; Sun, Baozhi

doi:10.1016/j.apacoust.2018.07.021

Cited by 19 publications

(6 citation statements)

References 22 publications

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“…Further research is needed regarding the additional technology applied to this PCG, for example by adding metal corrugate pipes. Fei Xue and Beibei Sun [19] have confirmed that the application of corrugated pipes in reactive mufflers significantly improves the noise reduction frequency range and the muffler with corrugated pipes have a better ability to lower the regenerative noise in low frequency than the muffler with insertion pipes. To obtain data that is more reliable, it is also necessary to conduct experiments using the same method with several subjects in the form of people indicated to have heart abnormalities.…”

Section: Discussionmentioning

confidence: 87%

Noise Reduction of Simplified Phonocardiograph Through Flexural Tube Adjustment

Sumarna¹,

Astono²,

Agustika³

et al. 2020

Proceedings of the International Conference on Educational Research and Innovation (ICERI 2019)

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This study aims to determine the length of the felxural tube phonocardiograph device for noise reduction from heart sound record data. Human. Phonocardiograph, which is a simplification of the phonocardiograph in the chest part (in whole) in the chest; pipe; condenser mic; pre-amp; PC. The data is then processed using the fast fourier transform (FFT) method to change the time domain to a domain that can be used with baseline data. Data processed by FFT PCG that uses a flexible tube as a filter are compared to those that use filters to influence the noise reduction. In terms of the length of the felxural tube there is a significant frequency obtained. The results of heart rate comparison through PCG with filters and without filters, then PCG with a flexible tube length of 1000 cm is the most optimal result in the FFT baseline.

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Section: Discussionmentioning

confidence: 87%

Noise Reduction of Simplified Phonocardiograph Through Flexural Tube Adjustment

Sumarna¹,

Astono²,

Agustika³

et al. 2020

Proceedings of the International Conference on Educational Research and Innovation (ICERI 2019)

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“…GT-Power software was used to test and verify the key structural parameters to evaluate the sum of the muffler transmission loss in the 510 Hz to 640 Hz frequency range [12]. Traditional muffler design theory was incorporated into the design optimization process based on GT-Power [13], [14].…”

Section: Related Workmentioning

confidence: 99%

“…The orthogonal test has been used to analyze muffler units, such as perforated pipes [9]- [11], and the acoustic performance of mufflers [12], [13] have been optimized with good results. However, those works only optimize the design of a certain muffler unit [14], [15], or only consider acoustics performances without considering aerodynamic performances. An in-depth study has not been performed to determine the law by which structural parameters affect the characteristics of both the acoustics and flow fields of resistant mufflers with complex structures.…”

Section: Introductionmentioning

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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“…Cambonie et al studied curved quarter-wave resonators to solve the problem of large spaces occupied by straight cavity resonators [3]. Xue et al applied U-shaped bellows to a resistant muffler, and the noise reduction performance was significantly improved in the cutoff frequency range [4]. Segin et al used the finite element analysis method to optimize the acoustic performance of a multi-chamber reactive silencer with baffles [5].…”

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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Experimental study on the comprehensive performance of the application of U-shaped corrugated pipes into reactive mufflers

Cited by 19 publications

References 22 publications

Noise Reduction of Simplified Phonocardiograph Through Flexural Tube Adjustment

Noise Reduction of Simplified Phonocardiograph Through Flexural Tube Adjustment

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

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

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