Noise reduction of a tractor exhaust tailpipe with bionic convex textures

Zhang, Zhijun; Hou, Zhenhua; Xin, Xiangjin; Liu, Lijie; Sun, Junjun

doi:10.3397/1/376731

Cited by 2 publications

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“…1 Related studies show that engine exhaust noise is one of the main noise sources in a forklift, and the most common way to reduce the exhaust noise is by installing a muffler in exhaust pipeline system, which can effectively attenuate or prevent sound transmission. 2,3 And thus designing exhaust muffler with fine acoustic performance is an important measure to reduce forklift radiated noise.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Zhang

Chen

Tian

et al. 2023

Noise & Vibration Worldwide

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In order to improve the acoustic performance of an internal combustion forklift exhaust muffler, this paper considered the influence of air flow and temperature, based on the flow field analysis theory, the exhaust muffler’s fluid domain model at the highest engine speed was established, that is, the complex flow and temperature fields were numerically simulated with a computational fluid dynamics (CFD) model, and the acoustic calculation was carried out by the finite element mothod (FEM), obtaining the velocity and temperature cloud maps and transmission loss curve. In addition, according to the simulation results, the improvement strategy towards intake pipe structural parameters was proposed. Numerical simulations indicate that for the improved exhaust muffler, flow eddy regions are obviously decreased, temperature gradient distribution is uniform, the transmission loss in most frequency bands and the overall sound attenuation effect are improved, which will lay a technical foundation for future physical application and multi-field coupling research.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Zhang

Chen

Tian

et al. 2023

Noise & Vibration Worldwide

View full text Add to dashboard Cite

show abstract

“…Zhang et al designed a structure on tractor bionic exhaust tailpipes [21]. Zhang et al designed the inner wall of the tractor exhaust tailpipe by using the bionics method and studied the noise reduction effect of the tractor exhaust tailpipe with different texture shapes [22]. The results showed that the bionic texture has the effect of reducing exhaust liner noise.…”

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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Noise reduction of a tractor exhaust tailpipe with bionic convex textures

Cited by 2 publications

References 0 publications

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

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