The Experts below are selected from a list of 22176 Experts worldwide ranked by ideXlab platform
Jun Yang - One of the best experts on this subject based on the ideXlab platform.
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Impedance Matching acoustic bend composed of perforated plates and side pipes
2017Co-Authors: Yuzhen Yang, W Lu, Jun YangAbstract:In this article, we propose a design for an Impedance-Matching acoustic bend. The bending structure is composed of sub-wavelength unit cells containing perforated plates and side pipes that allow the mass density and the bulk modulus of each unit cell to be tuned simultaneously. The refractive index and the Impedance of the acoustic bend can therefore be modulated simultaneously to guarantee both the bending effect and high acoustic transmission. The results of simulation of the sound pressure field distribution show that the bending effect of the proposed Impedance-Matching acoustic bend is very good. Transmission spectra are calculated for both the Impedance-Matching acoustic bend and an acoustic bend composed of the perforated plates alone for comparison. The results indicate that the Impedance-Matching acoustic bend successfully improves the Impedance ratio while also obviously increasing the transmission.
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Impedance Matching acoustic bend composed of perforated plates and side pipes
2017Co-Authors: Yuzhen Yang, Han Jia, Zhaoyong Sun, Jun YangAbstract:In this article, we propose a design for an Impedance-Matching acoustic bend. The bending structure is composed of sub-wavelength unit cells containing perforated plates and side pipes that allow the mass density and the bulk modulus of each unit cell to be tuned simultaneously. The refractive index and the Impedance of the acoustic bend can therefore be modulated simultaneously to guarantee both the bending effect and high acoustic transmission. The results of simulation of the sound pressure field distribution show that the bending effect of the proposed Impedance-Matching acoustic bend is very good. Transmission spectra are calculated for both the Impedance-Matching acoustic bend and an acoustic bend composed of the perforated plates alone for comparison. The results indicate that the Impedance-Matching acoustic bend successfully improves the Impedance ratio while also obviously increasing the transmission.In this article, we propose a design for an Impedance-Matching acoustic bend. The bending structure is composed of sub-wavelength unit cells containing perforated plates and side pipes that allow the mass density and the bulk modulus of each unit cell to be tuned simultaneously. The refractive index and the Impedance of the acoustic bend can therefore be modulated simultaneously to guarantee both the bending effect and high acoustic transmission. The results of simulation of the sound pressure field distribution show that the bending effect of the proposed Impedance-Matching acoustic bend is very good. Transmission spectra are calculated for both the Impedance-Matching acoustic bend and an acoustic bend composed of the perforated plates alone for comparison. The results indicate that the Impedance-Matching acoustic bend successfully improves the Impedance ratio while also obviously increasing the transmission.
Luc Mongeau - One of the best experts on this subject based on the ideXlab platform.
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dual driver standing wave tube acoustic Impedance Matching with robust repetitive control
2004Co-Authors: Yaoyu Li, George T C Chiu, Luc MongeauAbstract:In some acoustic applications, it may be desirable to make a shorter standing wave tube operate like a longer tube at the same driving frequency. The basic idea is to reduce the length of a long tube, and replace the removed section with a secondary driver. The problem is then to match the acoustic Impedance at the boundary where the secondary driver is installed to that of the original system. Two control formulations were investigated for this problem: a two-input-two-output (TITO) and a single-input-single-output (SISO) formulation. The TITO formulation directly tracks the two acoustic variables associated with the desired acoustic Impedance, while the SISO formulation minimizes the Impedance Matching error. The desired Impedance containing a very lightly damped mode is embedded in the augmented plant for feedback control design. In addition to the balance realization method, the Schur method was used for model reduction for the high-order plant. Since the standing wave tubes are driven by tonal signals, repetitive control was incorporated into the control frameworks to achieve the desired performance. Good performance of Impedance Matching was obtained for both formulations. The SISO formulation yielded slightly wider bandwidth of good Impedance Matching than the TITO. The TITO formulation offered additional control to individual signals related to the acoustic Impedance of interest.
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dual driver standing wave tube acoustic Impedance Matching with robust repetitive control
2002Co-Authors: Yaoyu Li, George T C Chiu, Luc MongeauAbstract:In many applications of acoustic standing wave tubes, for instance thermoacoustic heat pumping systems, it is desirable to make a shorter tube operate like a longer standing wave tube at the same driving frequency. The basic idea here is to reduce the physical length of the tube, and replace the removed section with a secondary driver. The problem is then to match the acoustic Impedance at the boundary where the secondary driver is installed to that of the original system. A two-input-two-output (TITO) formulation directly tracks the two acoustic variables related to the Impedance, while a SISO formulation minimizes the Impedance Matching error. The desired Impedance containing a very lightly damped mode is embedded in the augmented plant for feedback control design. In addition to the balance realization method, the Schur method was used in model reduction for the high-order non-minimum phase plants. Since the standing wave tubes are driven by tonal signals, repetitive control was incorporated into the control frameworks to achieve the desired performance. Good Impedance Matching performance was obtained for both formulations. The formulations are compared.
Yuzhen Yang - One of the best experts on this subject based on the ideXlab platform.
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Impedance Matching acoustic bend composed of perforated plates and side pipes
2017Co-Authors: Yuzhen Yang, W Lu, Jun YangAbstract:In this article, we propose a design for an Impedance-Matching acoustic bend. The bending structure is composed of sub-wavelength unit cells containing perforated plates and side pipes that allow the mass density and the bulk modulus of each unit cell to be tuned simultaneously. The refractive index and the Impedance of the acoustic bend can therefore be modulated simultaneously to guarantee both the bending effect and high acoustic transmission. The results of simulation of the sound pressure field distribution show that the bending effect of the proposed Impedance-Matching acoustic bend is very good. Transmission spectra are calculated for both the Impedance-Matching acoustic bend and an acoustic bend composed of the perforated plates alone for comparison. The results indicate that the Impedance-Matching acoustic bend successfully improves the Impedance ratio while also obviously increasing the transmission.
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Impedance Matching acoustic bend composed of perforated plates and side pipes
2017Co-Authors: Yuzhen Yang, Han Jia, Zhaoyong Sun, Jun YangAbstract:In this article, we propose a design for an Impedance-Matching acoustic bend. The bending structure is composed of sub-wavelength unit cells containing perforated plates and side pipes that allow the mass density and the bulk modulus of each unit cell to be tuned simultaneously. The refractive index and the Impedance of the acoustic bend can therefore be modulated simultaneously to guarantee both the bending effect and high acoustic transmission. The results of simulation of the sound pressure field distribution show that the bending effect of the proposed Impedance-Matching acoustic bend is very good. Transmission spectra are calculated for both the Impedance-Matching acoustic bend and an acoustic bend composed of the perforated plates alone for comparison. The results indicate that the Impedance-Matching acoustic bend successfully improves the Impedance ratio while also obviously increasing the transmission.In this article, we propose a design for an Impedance-Matching acoustic bend. The bending structure is composed of sub-wavelength unit cells containing perforated plates and side pipes that allow the mass density and the bulk modulus of each unit cell to be tuned simultaneously. The refractive index and the Impedance of the acoustic bend can therefore be modulated simultaneously to guarantee both the bending effect and high acoustic transmission. The results of simulation of the sound pressure field distribution show that the bending effect of the proposed Impedance-Matching acoustic bend is very good. Transmission spectra are calculated for both the Impedance-Matching acoustic bend and an acoustic bend composed of the perforated plates alone for comparison. The results indicate that the Impedance-Matching acoustic bend successfully improves the Impedance ratio while also obviously increasing the transmission.
Yaoyu Li - One of the best experts on this subject based on the ideXlab platform.
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dual driver standing wave tube acoustic Impedance Matching with robust repetitive control
2004Co-Authors: Yaoyu Li, George T C Chiu, Luc MongeauAbstract:In some acoustic applications, it may be desirable to make a shorter standing wave tube operate like a longer tube at the same driving frequency. The basic idea is to reduce the length of a long tube, and replace the removed section with a secondary driver. The problem is then to match the acoustic Impedance at the boundary where the secondary driver is installed to that of the original system. Two control formulations were investigated for this problem: a two-input-two-output (TITO) and a single-input-single-output (SISO) formulation. The TITO formulation directly tracks the two acoustic variables associated with the desired acoustic Impedance, while the SISO formulation minimizes the Impedance Matching error. The desired Impedance containing a very lightly damped mode is embedded in the augmented plant for feedback control design. In addition to the balance realization method, the Schur method was used for model reduction for the high-order plant. Since the standing wave tubes are driven by tonal signals, repetitive control was incorporated into the control frameworks to achieve the desired performance. Good performance of Impedance Matching was obtained for both formulations. The SISO formulation yielded slightly wider bandwidth of good Impedance Matching than the TITO. The TITO formulation offered additional control to individual signals related to the acoustic Impedance of interest.
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dual driver standing wave tube acoustic Impedance Matching with robust repetitive control
2002Co-Authors: Yaoyu Li, George T C Chiu, Luc MongeauAbstract:In many applications of acoustic standing wave tubes, for instance thermoacoustic heat pumping systems, it is desirable to make a shorter tube operate like a longer standing wave tube at the same driving frequency. The basic idea here is to reduce the physical length of the tube, and replace the removed section with a secondary driver. The problem is then to match the acoustic Impedance at the boundary where the secondary driver is installed to that of the original system. A two-input-two-output (TITO) formulation directly tracks the two acoustic variables related to the Impedance, while a SISO formulation minimizes the Impedance Matching error. The desired Impedance containing a very lightly damped mode is embedded in the augmented plant for feedback control design. In addition to the balance realization method, the Schur method was used in model reduction for the high-order non-minimum phase plants. Since the standing wave tubes are driven by tonal signals, repetitive control was incorporated into the control frameworks to achieve the desired performance. Good Impedance Matching performance was obtained for both formulations. The formulations are compared.
George T C Chiu - One of the best experts on this subject based on the ideXlab platform.
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dual driver standing wave tube acoustic Impedance Matching with robust repetitive control
2004Co-Authors: Yaoyu Li, George T C Chiu, Luc MongeauAbstract:In some acoustic applications, it may be desirable to make a shorter standing wave tube operate like a longer tube at the same driving frequency. The basic idea is to reduce the length of a long tube, and replace the removed section with a secondary driver. The problem is then to match the acoustic Impedance at the boundary where the secondary driver is installed to that of the original system. Two control formulations were investigated for this problem: a two-input-two-output (TITO) and a single-input-single-output (SISO) formulation. The TITO formulation directly tracks the two acoustic variables associated with the desired acoustic Impedance, while the SISO formulation minimizes the Impedance Matching error. The desired Impedance containing a very lightly damped mode is embedded in the augmented plant for feedback control design. In addition to the balance realization method, the Schur method was used for model reduction for the high-order plant. Since the standing wave tubes are driven by tonal signals, repetitive control was incorporated into the control frameworks to achieve the desired performance. Good performance of Impedance Matching was obtained for both formulations. The SISO formulation yielded slightly wider bandwidth of good Impedance Matching than the TITO. The TITO formulation offered additional control to individual signals related to the acoustic Impedance of interest.
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dual driver standing wave tube acoustic Impedance Matching with robust repetitive control
2002Co-Authors: Yaoyu Li, George T C Chiu, Luc MongeauAbstract:In many applications of acoustic standing wave tubes, for instance thermoacoustic heat pumping systems, it is desirable to make a shorter tube operate like a longer standing wave tube at the same driving frequency. The basic idea here is to reduce the physical length of the tube, and replace the removed section with a secondary driver. The problem is then to match the acoustic Impedance at the boundary where the secondary driver is installed to that of the original system. A two-input-two-output (TITO) formulation directly tracks the two acoustic variables related to the Impedance, while a SISO formulation minimizes the Impedance Matching error. The desired Impedance containing a very lightly damped mode is embedded in the augmented plant for feedback control design. In addition to the balance realization method, the Schur method was used in model reduction for the high-order non-minimum phase plants. Since the standing wave tubes are driven by tonal signals, repetitive control was incorporated into the control frameworks to achieve the desired performance. Good Impedance Matching performance was obtained for both formulations. The formulations are compared.
