The Experts below are selected from a list of 7479 Experts worldwide ranked by ideXlab platform

Xinmin Shen - One of the best experts on this subject based on the ideXlab platform.

  • acoustic multi layer helmholtz resonance metamaterials with multiple adjustable absorption peaks
    Applied Physics Letters, 2021
    Co-Authors: Haiqin Duan, Xinmin Shen, Xiaonan Zhang, Enshuai Wang, Fei Yang, Qin Yin
    Abstract:

    The single Helmholtz resonator obtains only one absorption peak in the broad frequency range, which limits its application in reducing the noise with multiple spectra. This paper reports an acoustic multi-layer Helmholtz resonance metamaterial, which can achieve multiple absorption peaks at given low-frequency targets. Meanwhile, through adjusting structural parameters of the multi-layer Helmholtz resonator, its impedance can be altered correspondingly to realize the absorption of noise with the multi groups of specific frequencies. In this paper, in order to achieve fine absorption performance with the specific frequencies of 100 and 400 Hz for a substation noise source, the sound absorption principle of a classical Helmholtz resonator with the embedded aperture is introduced theoretically, and then two series of multi-layer Helmholtz resonance structures with different parameters are designed. Thickness of the multi-layer structure is only 1/30th of the working Wavelength, and two groups of resonance peaks are generated at 100 and 400 Hz, respectively. A finite element model of the multi-layer Helmholtz resonator is constructed to simulate its absorption performance. The samples are fabricated through the 3D light-curing printing, and their sound absorption performances are detected by the Standing Wave Method. The simulation results are in good agreement with the experimental data, and two peaks with near-perfect absorptions are achieved at the target frequencies. The multi-layer Helmholtz resonator for achievement of three groups of absorption peaks is proposed later. This work provides an effective Method to design a sound absorber with multiple absorption peaks, which can promote the application of acoustic metamaterials.

  • optimization of geometric parameters of the standardized multilayer microperforated panel with finite dimension
    Noise Control Engineering Journal, 2019
    Co-Authors: Xiaocui Yang, Xinmin Shen, Liang Chen, Xiaoyan Zhang, Zhizhong Li
    Abstract:

    Standardized multilayer microperforated panel fabricated by laser beam machining of the spring steel was proposed for noise reduction in this study. Geometric parameters of the standardized multilayer microperforated panel, which include diameter of the hole, thickness of the panel, distance between the neighbor holes, and length of the cavity, were optimized for the better sound absorption performance. Sound absorption coefficient of the standardized multilayer microperforated panel was theoretically modeled based on the Maa's theory. The optimization of geometric parameters of the standardized multilayer microperforated panel was obtained by the Cuckoo search algorithm, and the finite dimension of 30 mm was treated as the additional constraint condition. Preliminary verification of the obtained optimal parameters was conducted through the constructed finite element simulation model. Actual sound absorption coefficients of the standardized multilayer microperforated panels with layer number of 1 to 4 were measured by Standing Wave Method, which were consistent with theoretical data and simulation data, and the corresponding average values in the frequency range of 100â–“6000 Hz were 57.45%, 70.85%, 71.99%, and 72.28%, respectively. By theoretical modeling, parameter optimization, simulation, and experimental validation, an effective Method was proposed to develop practical sound absorbers, which would promote their applications in noise reduction.

  • optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions
    Applied Acoustics, 2019
    Co-Authors: Xiaocui Yang, Panfeng Bai, Xinmin Shen, Liang Chen, Xiaonan Zhang, Qin Yin
    Abstract:

    Abstract Sound absorption performance of the multilayer microperforated panel can be improved through optimal design of structural parameters. Theoretical model of sound absorbing coefficient of the multilayer microperforated panel with different layers was constructed according to Maa’s theory. Structural parameters of the multilayer microperforated panel with layer number from 1 to 8 were optimized through the cuckoo search algorithm with constraint conditions. Preliminary verifications of the achieved optimal parameters were conducted by the analog simulation according to the finite element Method. The obtained optimal design of multilayer microperforated panel with no more than 4 layers was finally validated by testing experiments based on the Standing Wave Method, and the optimal average sound absorbing coefficients in the frequency range of 100–6000 Hz were 57.21%, 66.29%, 68.33%, and 69.36%, respectively. Through theoretical modeling, parameter optimization, analog simulation, and experimental validation, an effective Method for development of the desired sound absorber was proposed, which will be propitious to promote the applications of the multilayer microperforated panel products in the field of noise reduction.

  • geometrical and dimensional optimization of sound absorbing porous copper with cavity
    Materials & Design, 2017
    Co-Authors: Xiaocui Yang, Xinmin Shen, Xiaonan Zhang, Kang Peng, Panfeng Bai
    Abstract:

    Abstract Optimization of sound absorbing coefficient of porous copper under a limited dimension is focus of research in the fields of acoustics and mechanics. Through measuring the sound absorbing coefficient based on the Standing Wave Method, 5 groups of experiments are conducted to investigate the sound absorbing property of the porous copper with cavity under a limited dimension of 30 mm. There are two options can meet the requirement that the sound absorbing coefficients are larger than 70% in 2000-5000 Hz. First is the pure porous copper with thickness of 30 mm, and the other is the combination of porous copper with thickness of 25 mm and cavity with thickness of 5 mm. Based on the modified Johnson-Allard model with correction factor, it can be obtained that theoretical optimal thickness of the pure porous copper is 28.8 mm, and the theoretical optimal combination of porous copper and cavity are 22.7 mm and 7.3 mm. Experimental validations indicate that the two optimal options of the two modes both can meet the sound absorbing requirement. The results will promote the application of porous copper and improve the sound absorbing theory of porous material.

Xiaocui Yang - One of the best experts on this subject based on the ideXlab platform.

  • optimization of geometric parameters of the standardized multilayer microperforated panel with finite dimension
    Noise Control Engineering Journal, 2019
    Co-Authors: Xiaocui Yang, Xinmin Shen, Liang Chen, Xiaoyan Zhang, Zhizhong Li
    Abstract:

    Standardized multilayer microperforated panel fabricated by laser beam machining of the spring steel was proposed for noise reduction in this study. Geometric parameters of the standardized multilayer microperforated panel, which include diameter of the hole, thickness of the panel, distance between the neighbor holes, and length of the cavity, were optimized for the better sound absorption performance. Sound absorption coefficient of the standardized multilayer microperforated panel was theoretically modeled based on the Maa's theory. The optimization of geometric parameters of the standardized multilayer microperforated panel was obtained by the Cuckoo search algorithm, and the finite dimension of 30 mm was treated as the additional constraint condition. Preliminary verification of the obtained optimal parameters was conducted through the constructed finite element simulation model. Actual sound absorption coefficients of the standardized multilayer microperforated panels with layer number of 1 to 4 were measured by Standing Wave Method, which were consistent with theoretical data and simulation data, and the corresponding average values in the frequency range of 100â–“6000 Hz were 57.45%, 70.85%, 71.99%, and 72.28%, respectively. By theoretical modeling, parameter optimization, simulation, and experimental validation, an effective Method was proposed to develop practical sound absorbers, which would promote their applications in noise reduction.

  • optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions
    Applied Acoustics, 2019
    Co-Authors: Xiaocui Yang, Panfeng Bai, Xinmin Shen, Liang Chen, Xiaonan Zhang, Qin Yin
    Abstract:

    Abstract Sound absorption performance of the multilayer microperforated panel can be improved through optimal design of structural parameters. Theoretical model of sound absorbing coefficient of the multilayer microperforated panel with different layers was constructed according to Maa’s theory. Structural parameters of the multilayer microperforated panel with layer number from 1 to 8 were optimized through the cuckoo search algorithm with constraint conditions. Preliminary verifications of the achieved optimal parameters were conducted by the analog simulation according to the finite element Method. The obtained optimal design of multilayer microperforated panel with no more than 4 layers was finally validated by testing experiments based on the Standing Wave Method, and the optimal average sound absorbing coefficients in the frequency range of 100–6000 Hz were 57.21%, 66.29%, 68.33%, and 69.36%, respectively. Through theoretical modeling, parameter optimization, analog simulation, and experimental validation, an effective Method for development of the desired sound absorber was proposed, which will be propitious to promote the applications of the multilayer microperforated panel products in the field of noise reduction.

  • geometrical and dimensional optimization of sound absorbing porous copper with cavity
    Materials & Design, 2017
    Co-Authors: Xiaocui Yang, Xinmin Shen, Xiaonan Zhang, Kang Peng, Panfeng Bai
    Abstract:

    Abstract Optimization of sound absorbing coefficient of porous copper under a limited dimension is focus of research in the fields of acoustics and mechanics. Through measuring the sound absorbing coefficient based on the Standing Wave Method, 5 groups of experiments are conducted to investigate the sound absorbing property of the porous copper with cavity under a limited dimension of 30 mm. There are two options can meet the requirement that the sound absorbing coefficients are larger than 70% in 2000-5000 Hz. First is the pure porous copper with thickness of 30 mm, and the other is the combination of porous copper with thickness of 25 mm and cavity with thickness of 5 mm. Based on the modified Johnson-Allard model with correction factor, it can be obtained that theoretical optimal thickness of the pure porous copper is 28.8 mm, and the theoretical optimal combination of porous copper and cavity are 22.7 mm and 7.3 mm. Experimental validations indicate that the two optimal options of the two modes both can meet the sound absorbing requirement. The results will promote the application of porous copper and improve the sound absorbing theory of porous material.

Qin Yin - One of the best experts on this subject based on the ideXlab platform.

  • acoustic multi layer helmholtz resonance metamaterials with multiple adjustable absorption peaks
    Applied Physics Letters, 2021
    Co-Authors: Haiqin Duan, Xinmin Shen, Xiaonan Zhang, Enshuai Wang, Fei Yang, Qin Yin
    Abstract:

    The single Helmholtz resonator obtains only one absorption peak in the broad frequency range, which limits its application in reducing the noise with multiple spectra. This paper reports an acoustic multi-layer Helmholtz resonance metamaterial, which can achieve multiple absorption peaks at given low-frequency targets. Meanwhile, through adjusting structural parameters of the multi-layer Helmholtz resonator, its impedance can be altered correspondingly to realize the absorption of noise with the multi groups of specific frequencies. In this paper, in order to achieve fine absorption performance with the specific frequencies of 100 and 400 Hz for a substation noise source, the sound absorption principle of a classical Helmholtz resonator with the embedded aperture is introduced theoretically, and then two series of multi-layer Helmholtz resonance structures with different parameters are designed. Thickness of the multi-layer structure is only 1/30th of the working Wavelength, and two groups of resonance peaks are generated at 100 and 400 Hz, respectively. A finite element model of the multi-layer Helmholtz resonator is constructed to simulate its absorption performance. The samples are fabricated through the 3D light-curing printing, and their sound absorption performances are detected by the Standing Wave Method. The simulation results are in good agreement with the experimental data, and two peaks with near-perfect absorptions are achieved at the target frequencies. The multi-layer Helmholtz resonator for achievement of three groups of absorption peaks is proposed later. This work provides an effective Method to design a sound absorber with multiple absorption peaks, which can promote the application of acoustic metamaterials.

  • optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions
    Applied Acoustics, 2019
    Co-Authors: Xiaocui Yang, Panfeng Bai, Xinmin Shen, Liang Chen, Xiaonan Zhang, Qin Yin
    Abstract:

    Abstract Sound absorption performance of the multilayer microperforated panel can be improved through optimal design of structural parameters. Theoretical model of sound absorbing coefficient of the multilayer microperforated panel with different layers was constructed according to Maa’s theory. Structural parameters of the multilayer microperforated panel with layer number from 1 to 8 were optimized through the cuckoo search algorithm with constraint conditions. Preliminary verifications of the achieved optimal parameters were conducted by the analog simulation according to the finite element Method. The obtained optimal design of multilayer microperforated panel with no more than 4 layers was finally validated by testing experiments based on the Standing Wave Method, and the optimal average sound absorbing coefficients in the frequency range of 100–6000 Hz were 57.21%, 66.29%, 68.33%, and 69.36%, respectively. Through theoretical modeling, parameter optimization, analog simulation, and experimental validation, an effective Method for development of the desired sound absorber was proposed, which will be propitious to promote the applications of the multilayer microperforated panel products in the field of noise reduction.

Xiaonan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • acoustic multi layer helmholtz resonance metamaterials with multiple adjustable absorption peaks
    Applied Physics Letters, 2021
    Co-Authors: Haiqin Duan, Xinmin Shen, Xiaonan Zhang, Enshuai Wang, Fei Yang, Qin Yin
    Abstract:

    The single Helmholtz resonator obtains only one absorption peak in the broad frequency range, which limits its application in reducing the noise with multiple spectra. This paper reports an acoustic multi-layer Helmholtz resonance metamaterial, which can achieve multiple absorption peaks at given low-frequency targets. Meanwhile, through adjusting structural parameters of the multi-layer Helmholtz resonator, its impedance can be altered correspondingly to realize the absorption of noise with the multi groups of specific frequencies. In this paper, in order to achieve fine absorption performance with the specific frequencies of 100 and 400 Hz for a substation noise source, the sound absorption principle of a classical Helmholtz resonator with the embedded aperture is introduced theoretically, and then two series of multi-layer Helmholtz resonance structures with different parameters are designed. Thickness of the multi-layer structure is only 1/30th of the working Wavelength, and two groups of resonance peaks are generated at 100 and 400 Hz, respectively. A finite element model of the multi-layer Helmholtz resonator is constructed to simulate its absorption performance. The samples are fabricated through the 3D light-curing printing, and their sound absorption performances are detected by the Standing Wave Method. The simulation results are in good agreement with the experimental data, and two peaks with near-perfect absorptions are achieved at the target frequencies. The multi-layer Helmholtz resonator for achievement of three groups of absorption peaks is proposed later. This work provides an effective Method to design a sound absorber with multiple absorption peaks, which can promote the application of acoustic metamaterials.

  • optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions
    Applied Acoustics, 2019
    Co-Authors: Xiaocui Yang, Panfeng Bai, Xinmin Shen, Liang Chen, Xiaonan Zhang, Qin Yin
    Abstract:

    Abstract Sound absorption performance of the multilayer microperforated panel can be improved through optimal design of structural parameters. Theoretical model of sound absorbing coefficient of the multilayer microperforated panel with different layers was constructed according to Maa’s theory. Structural parameters of the multilayer microperforated panel with layer number from 1 to 8 were optimized through the cuckoo search algorithm with constraint conditions. Preliminary verifications of the achieved optimal parameters were conducted by the analog simulation according to the finite element Method. The obtained optimal design of multilayer microperforated panel with no more than 4 layers was finally validated by testing experiments based on the Standing Wave Method, and the optimal average sound absorbing coefficients in the frequency range of 100–6000 Hz were 57.21%, 66.29%, 68.33%, and 69.36%, respectively. Through theoretical modeling, parameter optimization, analog simulation, and experimental validation, an effective Method for development of the desired sound absorber was proposed, which will be propitious to promote the applications of the multilayer microperforated panel products in the field of noise reduction.

  • geometrical and dimensional optimization of sound absorbing porous copper with cavity
    Materials & Design, 2017
    Co-Authors: Xiaocui Yang, Xinmin Shen, Xiaonan Zhang, Kang Peng, Panfeng Bai
    Abstract:

    Abstract Optimization of sound absorbing coefficient of porous copper under a limited dimension is focus of research in the fields of acoustics and mechanics. Through measuring the sound absorbing coefficient based on the Standing Wave Method, 5 groups of experiments are conducted to investigate the sound absorbing property of the porous copper with cavity under a limited dimension of 30 mm. There are two options can meet the requirement that the sound absorbing coefficients are larger than 70% in 2000-5000 Hz. First is the pure porous copper with thickness of 30 mm, and the other is the combination of porous copper with thickness of 25 mm and cavity with thickness of 5 mm. Based on the modified Johnson-Allard model with correction factor, it can be obtained that theoretical optimal thickness of the pure porous copper is 28.8 mm, and the theoretical optimal combination of porous copper and cavity are 22.7 mm and 7.3 mm. Experimental validations indicate that the two optimal options of the two modes both can meet the sound absorbing requirement. The results will promote the application of porous copper and improve the sound absorbing theory of porous material.

Panfeng Bai - One of the best experts on this subject based on the ideXlab platform.

  • optimal design and experimental validation of sound absorbing multilayer microperforated panel with constraint conditions
    Applied Acoustics, 2019
    Co-Authors: Xiaocui Yang, Panfeng Bai, Xinmin Shen, Liang Chen, Xiaonan Zhang, Qin Yin
    Abstract:

    Abstract Sound absorption performance of the multilayer microperforated panel can be improved through optimal design of structural parameters. Theoretical model of sound absorbing coefficient of the multilayer microperforated panel with different layers was constructed according to Maa’s theory. Structural parameters of the multilayer microperforated panel with layer number from 1 to 8 were optimized through the cuckoo search algorithm with constraint conditions. Preliminary verifications of the achieved optimal parameters were conducted by the analog simulation according to the finite element Method. The obtained optimal design of multilayer microperforated panel with no more than 4 layers was finally validated by testing experiments based on the Standing Wave Method, and the optimal average sound absorbing coefficients in the frequency range of 100–6000 Hz were 57.21%, 66.29%, 68.33%, and 69.36%, respectively. Through theoretical modeling, parameter optimization, analog simulation, and experimental validation, an effective Method for development of the desired sound absorber was proposed, which will be propitious to promote the applications of the multilayer microperforated panel products in the field of noise reduction.

  • geometrical and dimensional optimization of sound absorbing porous copper with cavity
    Materials & Design, 2017
    Co-Authors: Xiaocui Yang, Xinmin Shen, Xiaonan Zhang, Kang Peng, Panfeng Bai
    Abstract:

    Abstract Optimization of sound absorbing coefficient of porous copper under a limited dimension is focus of research in the fields of acoustics and mechanics. Through measuring the sound absorbing coefficient based on the Standing Wave Method, 5 groups of experiments are conducted to investigate the sound absorbing property of the porous copper with cavity under a limited dimension of 30 mm. There are two options can meet the requirement that the sound absorbing coefficients are larger than 70% in 2000-5000 Hz. First is the pure porous copper with thickness of 30 mm, and the other is the combination of porous copper with thickness of 25 mm and cavity with thickness of 5 mm. Based on the modified Johnson-Allard model with correction factor, it can be obtained that theoretical optimal thickness of the pure porous copper is 28.8 mm, and the theoretical optimal combination of porous copper and cavity are 22.7 mm and 7.3 mm. Experimental validations indicate that the two optimal options of the two modes both can meet the sound absorbing requirement. The results will promote the application of porous copper and improve the sound absorbing theory of porous material.