The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

Bo Wang - One of the best experts on this subject based on the ideXlab platform.

  • Infrared imaging as a means of visually characterizing the thermoacoustic onset process influenced by a Helmholtz Resonator
    Applied Acoustics, 2012
    Co-Authors: Bo Wang, Weijuan Yang, Xuejun Zhang, Kai Wang, Junhu Zhou
    Abstract:

    Abstract A Helmholtz Resonator can be used as a transmission part to connect the thermoacoustic engine (TE) with its load. However, the Resonator can significantly influence the performance of the TE. In order to investigate the impact of a Helmholtz Resonator on the onset process of a TE, infrared (IR) imaging is firstly used as a visualization method to characterize the onset mechanism. The influence of dimensions of the Helmholtz Resonator on the onset process are analyzed experimentally and theoretically. Results show that the Helmholtz Resonator reduces the pressure amplitude at the onset moment and increases the onset temperature of the TE, both of which depend on the acoustic power absorbed from the TE. Onset without a sudden increase of pressure amplitude is observed with the Helmholtz Resonator at resonance length. This paper shows that IR imaging is an effective way to characterize the temperature distribution in a TE study.

  • Infrared imaging as a means of visually characterizing the thermoacoustic onset process influenced by a Helmholtz Resonator
    Applied Acoustics, 2012
    Co-Authors: Bo Wang, Daming Sun, Limin Qiu, Weijuan Yang, Xuejun Zhang, Kai Wang, Junhu Zhou
    Abstract:

    A Helmholtz Resonator can be used as a transmission part to connect the thermoacoustic engine (TE) with its load. However, the Resonator can significantly influence the performance of the TE. In order to investigate the impact of a Helmholtz Resonator on the onset process of a TE, infrared (IR) imaging is firstly used as a visualization method to characterize the onset mechanism. The influence of dimensions of the Helmholtz Resonator on the onset process are analyzed experimentally and theoretically. Results show that the Helmholtz Resonator reduces the pressure amplitude at the onset moment and increases the onset temperature of the TE, both of which depend on the acoustic power absorbed from the TE. Onset without a sudden increase of pressure amplitude is observed with the Helmholtz Resonator at resonance length. This paper shows that IR imaging is an effective way to characterize the temperature distribution in a TE study. © 2011 Elsevier Ltd. All rights reserved.

  • novel Helmholtz Resonator used to focus acoustic energy of thermoacoustic engine
    Applied Thermal Engineering, 2009
    Co-Authors: Bo Wang, Yong Xiao
    Abstract:

    A thermoacoustic engine (TE) converts thermal energy into acoustic power without any mechanical moving parts. It shows several advantages over traditional engines, such as simple configuration, stable operation, and environment-friendly working gas. In order to further improve the performance of a thermoacoustically driven system, methods are needed to focus the acoustic energy of a TE to its load. By theoretical analysis based on linear thermoacoustics, a novel Helmholtz Resonator is proposed to increase the transmission ability of a TE, which makes full use of the interaction between inertance and compliance effects. With this configuration, the output pressure amplitude of a TE is amplified and the maximal pressure amplitude can occur at the end of the Helmholtz Resonator tube with a length much shorter than 1/4 wavelength. Furthermore, the Helmholtz Resonator has shown remarkably increased volume flow rates at both ends. In experiments, a Helmholtz Resonator amplifies the pressure ratio from 1.22 to 1.49 and produces pressure amplitude of 0.44 MPa with nitrogen of 2.2 MPa as working gas. Relatively good agreements are obtained between computational and experimental results. This research is instructive for comprehensively understanding the transmission characteristics of acoustic components.

  • Novel Helmholtz Resonator used to focus acoustic energy of thermoacoustic engine
    Applied Thermal Engineering, 2009
    Co-Authors: Daming Sun, Limin Qiu, Bo Wang, Yong Xiao
    Abstract:

    A thermoacoustic engine (TE) converts thermal energy into acoustic power without any mechanical moving parts. It shows several advantages over traditional engines, such as simple configuration, stable operation, and environment-friendly working gas. In order to further improve the performance of a thermoacoustically driven system, methods are needed to focus the acoustic energy of a TE to its load. By theoretical analysis based on linear thermoacoustics, a novel Helmholtz Resonator is proposed to increase the transmission ability of a TE, which makes full use of the interaction between inertance and compliance effects. With this configuration, the output pressure amplitude of a TE is amplified and the maximal pressure amplitude can occur at the end of the Helmholtz Resonator tube with a length much shorter than 1/4 wavelength. Furthermore, the Helmholtz Resonator has shown remarkably increased volume flow rates at both ends. In experiments, a Helmholtz Resonator amplifies the pressure ratio from 1.22 to 1.49 and produces pressure amplitude of 0.44 MPa with nitrogen of 2.2 MPa as working gas. Relatively good agreements are obtained between computational and experimental results. This research is instructive for comprehensively understanding the transmission characteristics of acoustic components. © 2008 Elsevier Ltd. All rights reserved.

Wei He - One of the best experts on this subject based on the ideXlab platform.

  • Tunable acoustic energy harvester using Helmholtz Resonator and dual piezoelectric cantilever beams
    2014 IEEE International Ultrasonics Symposium, 2014
    Co-Authors: Aichao Yang, Caijiang Lu, Jitao Zhang, Xiao Peng, Ping Li, Wei He, Decai Wang, Feng Yang
    Abstract:

    A tunable acoustic energy harvester consisting of dual piezoelectric cantilever beams and a Helmholtz Resonator with a perforated backplate is proposed. The tunability of the operation frequency band can be achieved not only via simply adjusting the radius (r) of the aperture due to the strong dependence of resonance frequencies of the Helmholtz Resonator on the acoustic impedance affected by r, but also by changing the distance (d) between piezoelectric cantilever beams because of their magnetic force interaction. Experimental results show that as r (or d) increases from 0 (or 1.4) to 1.0 (or 3.4) cm, the frequency band is broadened and varies from 175.5~198 (or 175.5~213) Hz to 170.5~221 (or 161~203) Hz. The average ratio of the adjusted frequency bandwidth to r (or d) can reach 28 (or 2.25) Hz/cm over the range of 125~250 Hz.

  • enhanced acoustic energy harvesting using coupled resonance structure of sonic crystal and Helmholtz Resonator
    Applied Physics Express, 2013
    Co-Authors: Aichao Yang, Caijiang Lu, Jitao Zhang, Xiao Peng, Ping Li, Wei He
    Abstract:

    An acoustic energy harvester using a coupled resonance structure of a sonic crystal Resonator and an electromechanical Helmholtz Resonator with a piezoelectric composite diaphragm is proposed to enhance energy harvesting. Due to acoustic resonance coupling between the sonic crystal Resonator and the Helmholtz Resonator, the coupled resonance structure has a larger acoustic pressure magnification than each individual Resonator structure. Consequently, the stronger vibration of the diaphragm and the higher harvesting efficiency are obtained. Experimental results show that the proposed harvester exhibits ~23 and ~262 times higher maximum harvesting efficiencies than the sonic crystal Resonator and the Helmholtz Resonator structure, respectively.

  • Enhanced acoustic energy harvesting using coupled resonance structure of sonic crystal and Helmholtz Resonator
    Applied Physics Express, 2013
    Co-Authors: Aichao Yang, Caijiang Lu, Jitao Zhang, Yumei Wen, Xiao Peng, Ping Li, Wei He
    Abstract:

    An acoustic energy harvester using a coupled resonance structure of a sonic crystal Resonator and an electromechanical Helmholtz Resonator with a piezoelectric composite diaphragm is proposed to enhance energy harvesting. Due to acoustic resonance coupling between the sonic crystal Resonator and the Helmholtz Resonator, the coupled resonance structure has a larger acoustic pressure magnification than each individual Resonator structure. Consequently, the stronger vibration of the diaphragm and the higher harvesting efficiency are obtained. Experimental results show that the proposed harvester exhibits ∼23 and ∼262 times higher maximum harvesting efficiencies than the sonic crystal Resonator and the Helmholtz Resonator structure, respectively. © 2013 The Japan Society of Applied Physics.

Yong Xiao - One of the best experts on this subject based on the ideXlab platform.

  • novel Helmholtz Resonator used to focus acoustic energy of thermoacoustic engine
    Applied Thermal Engineering, 2009
    Co-Authors: Bo Wang, Yong Xiao
    Abstract:

    A thermoacoustic engine (TE) converts thermal energy into acoustic power without any mechanical moving parts. It shows several advantages over traditional engines, such as simple configuration, stable operation, and environment-friendly working gas. In order to further improve the performance of a thermoacoustically driven system, methods are needed to focus the acoustic energy of a TE to its load. By theoretical analysis based on linear thermoacoustics, a novel Helmholtz Resonator is proposed to increase the transmission ability of a TE, which makes full use of the interaction between inertance and compliance effects. With this configuration, the output pressure amplitude of a TE is amplified and the maximal pressure amplitude can occur at the end of the Helmholtz Resonator tube with a length much shorter than 1/4 wavelength. Furthermore, the Helmholtz Resonator has shown remarkably increased volume flow rates at both ends. In experiments, a Helmholtz Resonator amplifies the pressure ratio from 1.22 to 1.49 and produces pressure amplitude of 0.44 MPa with nitrogen of 2.2 MPa as working gas. Relatively good agreements are obtained between computational and experimental results. This research is instructive for comprehensively understanding the transmission characteristics of acoustic components.

  • Novel Helmholtz Resonator used to focus acoustic energy of thermoacoustic engine
    Applied Thermal Engineering, 2009
    Co-Authors: Daming Sun, Limin Qiu, Bo Wang, Yong Xiao
    Abstract:

    A thermoacoustic engine (TE) converts thermal energy into acoustic power without any mechanical moving parts. It shows several advantages over traditional engines, such as simple configuration, stable operation, and environment-friendly working gas. In order to further improve the performance of a thermoacoustically driven system, methods are needed to focus the acoustic energy of a TE to its load. By theoretical analysis based on linear thermoacoustics, a novel Helmholtz Resonator is proposed to increase the transmission ability of a TE, which makes full use of the interaction between inertance and compliance effects. With this configuration, the output pressure amplitude of a TE is amplified and the maximal pressure amplitude can occur at the end of the Helmholtz Resonator tube with a length much shorter than 1/4 wavelength. Furthermore, the Helmholtz Resonator has shown remarkably increased volume flow rates at both ends. In experiments, a Helmholtz Resonator amplifies the pressure ratio from 1.22 to 1.49 and produces pressure amplitude of 0.44 MPa with nitrogen of 2.2 MPa as working gas. Relatively good agreements are obtained between computational and experimental results. This research is instructive for comprehensively understanding the transmission characteristics of acoustic components. © 2008 Elsevier Ltd. All rights reserved.

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

  • Tunable acoustic energy harvester using Helmholtz Resonator and dual piezoelectric cantilever beams
    2014 IEEE International Ultrasonics Symposium, 2014
    Co-Authors: Aichao Yang, Caijiang Lu, Jitao Zhang, Xiao Peng, Ping Li, Wei He, Decai Wang, Feng Yang
    Abstract:

    A tunable acoustic energy harvester consisting of dual piezoelectric cantilever beams and a Helmholtz Resonator with a perforated backplate is proposed. The tunability of the operation frequency band can be achieved not only via simply adjusting the radius (r) of the aperture due to the strong dependence of resonance frequencies of the Helmholtz Resonator on the acoustic impedance affected by r, but also by changing the distance (d) between piezoelectric cantilever beams because of their magnetic force interaction. Experimental results show that as r (or d) increases from 0 (or 1.4) to 1.0 (or 3.4) cm, the frequency band is broadened and varies from 175.5~198 (or 175.5~213) Hz to 170.5~221 (or 161~203) Hz. The average ratio of the adjusted frequency bandwidth to r (or d) can reach 28 (or 2.25) Hz/cm over the range of 125~250 Hz.

  • enhanced acoustic energy harvesting using coupled resonance structure of sonic crystal and Helmholtz Resonator
    Applied Physics Express, 2013
    Co-Authors: Aichao Yang, Caijiang Lu, Jitao Zhang, Xiao Peng, Ping Li, Wei He
    Abstract:

    An acoustic energy harvester using a coupled resonance structure of a sonic crystal Resonator and an electromechanical Helmholtz Resonator with a piezoelectric composite diaphragm is proposed to enhance energy harvesting. Due to acoustic resonance coupling between the sonic crystal Resonator and the Helmholtz Resonator, the coupled resonance structure has a larger acoustic pressure magnification than each individual Resonator structure. Consequently, the stronger vibration of the diaphragm and the higher harvesting efficiency are obtained. Experimental results show that the proposed harvester exhibits ~23 and ~262 times higher maximum harvesting efficiencies than the sonic crystal Resonator and the Helmholtz Resonator structure, respectively.

  • Enhanced acoustic energy harvesting using coupled resonance structure of sonic crystal and Helmholtz Resonator
    Applied Physics Express, 2013
    Co-Authors: Aichao Yang, Caijiang Lu, Jitao Zhang, Yumei Wen, Xiao Peng, Ping Li, Wei He
    Abstract:

    An acoustic energy harvester using a coupled resonance structure of a sonic crystal Resonator and an electromechanical Helmholtz Resonator with a piezoelectric composite diaphragm is proposed to enhance energy harvesting. Due to acoustic resonance coupling between the sonic crystal Resonator and the Helmholtz Resonator, the coupled resonance structure has a larger acoustic pressure magnification than each individual Resonator structure. Consequently, the stronger vibration of the diaphragm and the higher harvesting efficiency are obtained. Experimental results show that the proposed harvester exhibits ∼23 and ∼262 times higher maximum harvesting efficiencies than the sonic crystal Resonator and the Helmholtz Resonator structure, respectively. © 2013 The Japan Society of Applied Physics.

Daming Sun - One of the best experts on this subject based on the ideXlab platform.

  • Infrared imaging as a means of visually characterizing the thermoacoustic onset process influenced by a Helmholtz Resonator
    Applied Acoustics, 2012
    Co-Authors: Bo Wang, Daming Sun, Limin Qiu, Weijuan Yang, Xuejun Zhang, Kai Wang, Junhu Zhou
    Abstract:

    A Helmholtz Resonator can be used as a transmission part to connect the thermoacoustic engine (TE) with its load. However, the Resonator can significantly influence the performance of the TE. In order to investigate the impact of a Helmholtz Resonator on the onset process of a TE, infrared (IR) imaging is firstly used as a visualization method to characterize the onset mechanism. The influence of dimensions of the Helmholtz Resonator on the onset process are analyzed experimentally and theoretically. Results show that the Helmholtz Resonator reduces the pressure amplitude at the onset moment and increases the onset temperature of the TE, both of which depend on the acoustic power absorbed from the TE. Onset without a sudden increase of pressure amplitude is observed with the Helmholtz Resonator at resonance length. This paper shows that IR imaging is an effective way to characterize the temperature distribution in a TE study. © 2011 Elsevier Ltd. All rights reserved.

  • Novel Helmholtz Resonator used to focus acoustic energy of thermoacoustic engine
    Applied Thermal Engineering, 2009
    Co-Authors: Daming Sun, Limin Qiu, Bo Wang, Yong Xiao
    Abstract:

    A thermoacoustic engine (TE) converts thermal energy into acoustic power without any mechanical moving parts. It shows several advantages over traditional engines, such as simple configuration, stable operation, and environment-friendly working gas. In order to further improve the performance of a thermoacoustically driven system, methods are needed to focus the acoustic energy of a TE to its load. By theoretical analysis based on linear thermoacoustics, a novel Helmholtz Resonator is proposed to increase the transmission ability of a TE, which makes full use of the interaction between inertance and compliance effects. With this configuration, the output pressure amplitude of a TE is amplified and the maximal pressure amplitude can occur at the end of the Helmholtz Resonator tube with a length much shorter than 1/4 wavelength. Furthermore, the Helmholtz Resonator has shown remarkably increased volume flow rates at both ends. In experiments, a Helmholtz Resonator amplifies the pressure ratio from 1.22 to 1.49 and produces pressure amplitude of 0.44 MPa with nitrogen of 2.2 MPa as working gas. Relatively good agreements are obtained between computational and experimental results. This research is instructive for comprehensively understanding the transmission characteristics of acoustic components. © 2008 Elsevier Ltd. All rights reserved.