Experiment and Simulation Analysis on Noise Attenuation of Al/MF Cylindrical Shells

Li, Bin; Li, Jian; Yan, Shilin; Yan, Wei; He, Xu

doi:10.1155/2017/6980501

Cited by 6 publications

(10 citation statements)

References 3 publications

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“…Our study has shown a significant association between TYK2 rs280521 and RA risk for the first time, which was different from the results reported by Sigurdsson et al [ 33 ] in patients with SLE. We also found that TYK2 rs8108236 polymorphism was significantly associated with RA risk, which was different from that reported by Tang et al [ 12 ] and Li et al [ 30 ] in patients with SLE in Chinese Han populations. These conflicting results suggest there is a difference in the pathogenesis of SLE and RA.…”

Section: Discussioncontrasting

confidence: 99%

“…No0, no association was found between the IRF 5 exon 6 (de/in), rs2070197 (C/T), and rs10954213 (G/A) and RA susceptibility in the Chinese Han population. No association between rs10954213 and RA was identified in the present study, which agrees with the results reported by Li et al [ 30 ]. Moreover, rs2070197 was not found to be polymorphic in our sample.…”

Section: Discussionsupporting

confidence: 93%

“…Our results confirmed significant associations between rs2004640 and RA in a Chinese Han population according to allele, dominant, and recessive models. The frequencies of rs2004640 T allele and TT genotype were lower in controls than in the RA cases, which is consistent with previous studies conducted in Chinese Han populations with RA [ 30 , 31 ]. Kozyrev et al found that IRF5 gene rs2004640 had significant ethnic heterogeneity [ 32 ].…”

Section: Discussionsupporting

confidence: 91%

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Polymorphisms in IRF5 and TYK2 Genes Are Associated with Rheumatoid Arthritis in a Chinese Han Population

et al. 2020

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Background The IRF5 and TYK2 gene polymorphisms are associated with autoimmune diseases. However, the relationship between the IRF5 and TYK2 gene polymorphisms and RA risk in the Chinese Han population was inconsistent. Material/Methods A total of 578 RA patients (case group) and 578 healthy controls (control group) were assessed in a case-control study. Genotyping of IRF5 (Exon 6 insertion/deletion (in/de), rs2004640, rs2070197, rs10954213) and TYK2 (rs280500, rs280519, rs280521, rs8108236, rs12720253) was performed by direct sequencing method. Data analysis was performed by SHEsis. Results The rs2004640T allele ( P =0.0003) and the dominant ( P =0.001) and recessive ( P =0.01) models of rs2004640 were associated with RA risk after stringent Bonferroni correction (0.05/4). The IRF5 exon 6 (in), rs2070197 and rs10954213 were not associated with RA ( P >0.05). Two haplotypes of IRF5 (DTAT and DTGG) were associated with RA susceptibility ( P <0.05). In addition, the frequencies of TYK2 rs280500A, rs280521A, and rs8108236A were significantly higher in the RA group compared with the control group ( P <0.05). TYK2 rs280500, rs280521, and rs8108236 were associated with RA susceptibility in the dominant model, but the same was not observed for rs280519 and rs12720253 ( P <0.05). Furthermore, 3 risk haplotypes (AAAGT, AGGAT, and GAAAT) and a protective haplotype (GAGGT) of TYK2 gene were associated with RA susceptibility ( P <0.05). Conclusions Our results suggest that IRF5 rs2004640, TYK2 rs280500, rs280521, rs8108236, and haplotypes IRF5 (DTAT and DTGG) and TYK2 (AAAGT, AGGAT, GAAAT, and GAGGT) are susceptible factors for RA in a Chinese Han population.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 91%

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Polymorphisms in IRF5 and TYK2 Genes Are Associated with Rheumatoid Arthritis in a Chinese Han Population

et al. 2020

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“…A noise reduction test platform for aluminum alloy reinforced cylindrical shell has been built at our previous work [14]. The experiment result showed that there were many peak noises in the response of the acoustic cavity in the cylindrical shell under the action of the reverberation sound source whose external loads are 117 dB.…”

Section: The Noise Reduction Experiments Of Cylindrical Shell With Hrmentioning

confidence: 99%

Experiment-simulation Study on Noise Reduction of Cylinder Shell with Horn Helmholtz Resonator

Yan

et al. 2020

Teh. vjesn.

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This paper focuses on the noise reduction of the cylindrical structure at low frequency (130 Hz-180 Hz). The low-frequency noise response spectrum in the cylindrical cavity is obtained by using the Helmholtz resonator (HR) to reduce the noise peak amplitude. The acoustic simulation software Virtual.Lab is used to establish the finite element model of the cylindrical shell with HR, and to obtain the low-frequency acoustic response in the cylindrical cavity. The simulation model is validated by the experimental results. Then, the influence of installation position, the number of installed resonators and the resonators with different resonance frequencies in the cylindrical cavity are discussed. The results indicate that both the noise reduction band and peak amplitude are increased by installing the HR's on the cylinder shell. The noise reduction of the cylinder shell with HR installed on the upper position is larger than other situations. As the number of resonators increased, the frequency range of the noise reduction in the cylindrical cavity gradually increases, and the noise reduction of the cylinder cavity increases first and then decreases.

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“…Lane et al [3] used experimental testing methods to study the effect of lining melamine foam on the inner wall on the acoustic response of the fairing cavity. Li et al [15][16][17] studied the noise reduction of cylindrical cavity lining MF in midlow frequency. Yan et al [18] studied the lining scheme of the acoustic cladding of cylindrical shells and the influence of lining thickness on noise response using the finite element simulation method.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Cylindrical Shell Cavity Noise with Melamine Foam Lining

Yan

et al. 2021

Shock and Vibration

Self Cite

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To solve the problem of the harsh midlow frequency noise of rocket fairing, the cylindrical section of the protective precision instrument fairing is simplified as cylindrical shells, and different lining strategies of melamine foam (MF) are studied experimentally and numerically. Based on Virtual.Lab Acoustic software, a finite element model of the cylindrical cavity is established, and the correctness is verified by comparison with the measured data. On that basis, the influences of the lining position of different thickness MF on the noise reduction of cylindrical shells are investigated. It is shown that the thickness and location of the laying material have a significant effect on the noise reduction at the same specific gravity.

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Experiment and Simulation Analysis on Noise Attenuation of Al/MF Cylindrical Shells

Cited by 6 publications

References 3 publications

Polymorphisms in IRF5 and TYK2 Genes Are Associated with Rheumatoid Arthritis in a Chinese Han Population

Polymorphisms in IRF5 and TYK2 Genes Are Associated with Rheumatoid Arthritis in a Chinese Han Population

Experiment-simulation Study on Noise Reduction of Cylinder Shell with Horn Helmholtz Resonator

Simulation Analysis of Cylindrical Shell Cavity Noise with Melamine Foam Lining

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