The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform
H Henk Nijmeijer - One of the best experts on this subject based on the ideXlab platform.
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Broadband planar nearfield acoustic holography based on one-Third-Octave band analysis
2020Co-Authors: Hefeng Zhou, I. Lopez Arteaga, H Henk NijmeijerAbstract:Planar nearfield acoustic holography is usually based on narrow-band, single frequency analysis, which is time consuming when the source behavior over a broad frequency range is of interest, as is the case with many industrial sources. In the present paper a method, broadband planar nearfield acoustic holography based on one-Third-Octave band analysis (BPNAH), is developed, of which data concerning the complex band pressure on the hologram is obtained by the combination of the one-Third-Octave band mean-square pressure and the phase of the pressure corresponding to a single frequency line. A numerical study shows that there is no noticeable difference between the quality of the reconstruction by the BPNAH method and the quality of the conventional reconstruction, which is based on the summation of one frequency by one frequency in the corresponding band, even in the presence of noise. Further analysis shows this procedure can be extended to a source consisting of a set of fully correlated points, of which the primary points are all close together and other relatively secondary points can be far away from the former points. This method is a simple, time-saving and robust technique and thus particularly adapted to industrial studies.
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Broadband planar nearfield acoustic holography based on one-Third-Octave band analysis
Applied Acoustics, 2016Co-Authors: Hefeng Zhou, Ines Lopez-arteaga, H Henk NijmeijerAbstract:Planar nearfield acoustic holography (PNAH) is usually based on narrow-band, single frequency analysis, which is time consuming when the source behavior over a broad frequency range is of interest, as is the case with many industrial sources. In this paper a method, broadband planar nearfield acoustic holography based on one-Third-Octave band analysis (BPNAH), is described. Data relating to the complex band pressure on the hologram is obtained by combining the root-mean-square pressure corresponding to a one-Third-Octave band with the phase of the pressure corresponding to a single frequency line. Numerical simulations and measurements show that the BPNAH method allows a significant reduction in processing time, while keeping a similar accuracy to the conventional reconstruction, which is based on the summation of frequency by frequency in the corresponding band. As a simple, time-saving and robust technique, the BPNAH method is particularly well adapted to industrial studies.
Hefeng Zhou - One of the best experts on this subject based on the ideXlab platform.
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Broadband planar nearfield acoustic holography based on one-Third-Octave band analysis
2020Co-Authors: Hefeng Zhou, I. Lopez Arteaga, H Henk NijmeijerAbstract:Planar nearfield acoustic holography is usually based on narrow-band, single frequency analysis, which is time consuming when the source behavior over a broad frequency range is of interest, as is the case with many industrial sources. In the present paper a method, broadband planar nearfield acoustic holography based on one-Third-Octave band analysis (BPNAH), is developed, of which data concerning the complex band pressure on the hologram is obtained by the combination of the one-Third-Octave band mean-square pressure and the phase of the pressure corresponding to a single frequency line. A numerical study shows that there is no noticeable difference between the quality of the reconstruction by the BPNAH method and the quality of the conventional reconstruction, which is based on the summation of one frequency by one frequency in the corresponding band, even in the presence of noise. Further analysis shows this procedure can be extended to a source consisting of a set of fully correlated points, of which the primary points are all close together and other relatively secondary points can be far away from the former points. This method is a simple, time-saving and robust technique and thus particularly adapted to industrial studies.
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Broadband planar nearfield acoustic holography based on one-Third-Octave band analysis
Applied Acoustics, 2016Co-Authors: Hefeng Zhou, Ines Lopez-arteaga, H Henk NijmeijerAbstract:Planar nearfield acoustic holography (PNAH) is usually based on narrow-band, single frequency analysis, which is time consuming when the source behavior over a broad frequency range is of interest, as is the case with many industrial sources. In this paper a method, broadband planar nearfield acoustic holography based on one-Third-Octave band analysis (BPNAH), is described. Data relating to the complex band pressure on the hologram is obtained by combining the root-mean-square pressure corresponding to a one-Third-Octave band with the phase of the pressure corresponding to a single frequency line. Numerical simulations and measurements show that the BPNAH method allows a significant reduction in processing time, while keeping a similar accuracy to the conventional reconstruction, which is based on the summation of frequency by frequency in the corresponding band. As a simple, time-saving and robust technique, the BPNAH method is particularly well adapted to industrial studies.
I. Lopez Arteaga - One of the best experts on this subject based on the ideXlab platform.
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Broadband planar nearfield acoustic holography based on one-Third-Octave band analysis
2020Co-Authors: Hefeng Zhou, I. Lopez Arteaga, H Henk NijmeijerAbstract:Planar nearfield acoustic holography is usually based on narrow-band, single frequency analysis, which is time consuming when the source behavior over a broad frequency range is of interest, as is the case with many industrial sources. In the present paper a method, broadband planar nearfield acoustic holography based on one-Third-Octave band analysis (BPNAH), is developed, of which data concerning the complex band pressure on the hologram is obtained by the combination of the one-Third-Octave band mean-square pressure and the phase of the pressure corresponding to a single frequency line. A numerical study shows that there is no noticeable difference between the quality of the reconstruction by the BPNAH method and the quality of the conventional reconstruction, which is based on the summation of one frequency by one frequency in the corresponding band, even in the presence of noise. Further analysis shows this procedure can be extended to a source consisting of a set of fully correlated points, of which the primary points are all close together and other relatively secondary points can be far away from the former points. This method is a simple, time-saving and robust technique and thus particularly adapted to industrial studies.
Ines Lopez-arteaga - One of the best experts on this subject based on the ideXlab platform.
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Broadband planar nearfield acoustic holography based on one-Third-Octave band analysis
Applied Acoustics, 2016Co-Authors: Hefeng Zhou, Ines Lopez-arteaga, H Henk NijmeijerAbstract:Planar nearfield acoustic holography (PNAH) is usually based on narrow-band, single frequency analysis, which is time consuming when the source behavior over a broad frequency range is of interest, as is the case with many industrial sources. In this paper a method, broadband planar nearfield acoustic holography based on one-Third-Octave band analysis (BPNAH), is described. Data relating to the complex band pressure on the hologram is obtained by combining the root-mean-square pressure corresponding to a one-Third-Octave band with the phase of the pressure corresponding to a single frequency line. Numerical simulations and measurements show that the BPNAH method allows a significant reduction in processing time, while keeping a similar accuracy to the conventional reconstruction, which is based on the summation of frequency by frequency in the corresponding band. As a simple, time-saving and robust technique, the BPNAH method is particularly well adapted to industrial studies.
Mariano Ruiz - One of the best experts on this subject based on the ideXlab platform.
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Uniform error distribution in one‐third octave band frequency analysis
Journal of the Acoustical Society of America, 1999Co-Authors: A. Martin, Manuel Recuero, Guillermo De Arcas, Mariano RuizAbstract:In this paper an algorithm for obtaining a uniform error distribution in one‐third octave band frequency analysis is presented. The algorithm is a digital signal processing implementation of the ANSI S1.11‐1986 standard based on digital filters. First the effects of constant integration time over error distribution are discussed and then a solution is presented based on a statistical signal processing interpretation of the problem. The power distribution measurement is analyzed and studied as a variance estimation problem to establish the requirements of the analysis algorithm that will guarantee a uniform error distribution. The object of the algorithm is to obtain a uniform error distribution maintaining the total number of operations as low as possible in order to be efficient enough to be implemented in real time. The discussion is completed with several simulation results and a performance comparison with other popular alternatives.
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A third octave real time VXI analyzer
Journal of the Acoustical Society of America, 1999Co-Authors: A. Martin, Manuel Recuero, Juan Manuel López, Mariano RuizAbstract:A digital signal processing system with VXI interface has been developed in a C‐size board conforming to VXI 1.4 specification, and is made up of two blocks. The first one implements a message VXI interface and the second the digital processing itself, based in a 49‐MHz TMS320C31. The system includes a complete software to customize for a specific application. The VXI interface has been gifted with a real time operating system and a software parser for building a SCPI (standard command for programmable instruments) translator. The software developed for the digital signal processing system has been built in several modules written in C language and C30 assembler in order to improve the velocity. The utility of this system is to realize customizable and specific digital signal processing without the necessity of acquiring complex and expensive VXI boards that do not allow modification of the commands, the specific algorithm, or the firmware. In order to show the versatility of the system, a one‐third‐octave real time analyzer has been developed in agreement with ANSI S1.11.
