15,408 Hits in 6.3 sec

A pseudo-inverse algorithm for simultaneous measurements using multiple acoustical sources

Ning Xiang, Shu Li
2007 Journal of the Acoustical Society of America  
This paper presents a pseudo-inverse algorithm for the SMASM correlation technique as an alternative way of extracting impulse responses of acoustical channels.  ...  Simultaneous multiple acoustical sources measurement ͑SMASM͒ has been proposed for more effective and reliable identification of acoustical systems under critical conditions ͓N. Xiang and M.  ...  Arnold, and A. Raabe, "Acoustic tomography as a method to identify small-scale land surface characteristics," Acta. Acust. Acust. 87, 731-737 ͑2001͒.  ... 
doi:10.1121/1.2434763 pmid:17407864 fatcat:zldmgkaxjrcaxmjeglwrx5or4a

From constant to variable density inverse extended Born modelling [article]

Milad Farshad, Hervé Chauris
2020 arXiv   pre-print
The application of the pseudo-inverse Born modelling is based on constant density acoustic media, which is a limiting factor for practical applications.  ...  The first one is a generalization of a recent study proposing to recover acoustic perturbations from angle-dependent response of the pseudo-inverse Born modelling operator.  ...  For all approaches, the starting point is pseudo-inverse modelling in constant density acoustic media. Here, we extend the Chauris and Cocher (2017) method to variable density acoustic media.  ... 
arXiv:2001.06413v1 fatcat:4ajzryrufjbppgkqv3y44uojku

3D Seismic Sedimentology of Nearshore Subaqueous Fans – A Case Study from Dongying Depression, Eastern China [chapter]

Yang Fengli, Zhao Wenfang, Sun Zhuan, Cheng Haisheng, Peng Yunxi
2011 Advances in Data, Methods, Models and Their Applications in Geoscience  
in Data, Methods, Models and Their Applications in Geoscience  ...  The pseudo-acoustic 3D seismic inversion based on Logs reconstruction Methodology The pseudo-acoustic 3D seismic inversion method different from the conventional 3D seismic impedance inversion method  ... 
doi:10.5772/27736 fatcat:ib5ze5ngpjbutpjcqwkcdlwi34

Identifying equivalent sound sources from aeroacoustic simulations using a numerical phased array

Nicolas J. Pignier, Ciarán J. O'Reilly, Susann Boij
2017 Journal of Sound and Vibration  
The dual-LP beamforming approach shows better robustness to changes in the number of probes and sources than the pseudo-inverse approach.  ...  Abstract An application of phased array methods to numerical data is presented, aimed at identifying equivalent flow sound sources from aeroacoustic simulations.  ...  The sources are modelled using both pseudo-inverse and dual-LP beamforming methods, and the acoustic spectrum obtained from these sources is computed at the far-field observer using Eqs.  ... 
doi:10.1016/j.jsv.2017.01.051 fatcat:rzgfusyyrvh3xot22haqv6bsa4

An Application of the Inverse Method in the Vibroacoustic Analysis of Industrial Rooms

J. Piechowicz
2012 Acta Physica Polonica. A  
The problem of identication and localization of sound sources inside industrial rooms, including cases when the density of sound sources is considerable, can be solved by application of inverse methods  ...  For the cases when determination of the rooms' acoustical properties is required the combination of the inverse method with the boundary elements method allows the calculation of acoustic impedance for  ...  Acknowledgments This research work is supported by the Polish Ministry of Science and Higher Education grant no. N N 504342536.  ... 
doi:10.12693/aphyspola.121.a-183 fatcat:k6myitb77reozkggpa4x67e2ra

Acoustic Source Characterization of Marine Propulsors

Jukka Tanttari, Antti Hynninen
2022 Journal of Marine Science and Engineering  
In this paper, procedure to characterize marine propulsors as acoustic sources with inverse method is introduced. First, the numerical model with complete hydro-acoustic sources is investigated.  ...  Then selected responses are used as input in source characterization with inverse method.  ...  Institutional Review Board Statement: Not applicable. Informed Consent Statement: Not applicable. Data Availability Statement: Not applicable.  ... 
doi:10.3390/jmse10091273 fatcat:hysrg7pqbvbmhmktosv2bzo7bi

Acoustic Model Training Using Pseudo-Speaker Features Generated by MLLR Transformations for Robust Speaker-Independent Speech Recognition

Arata ITOH, Sunao HARA, Norihide KITAOKA, Kazuya TAKEDA
2012 IEICE transactions on information and systems  
We achieve this by adopting inverse maximum likelihood linear regression (MLLR) transformation-based feature generation, and then we train our models using these features.  ...  features of the pseudo-speakers.  ...  Section 3 discusses the experimental results of the proposed method and compares it with adaptation-based methods and speaker adaptive training.  ... 
doi:10.1587/transinf.e95.d.2479 fatcat:qs7op6r3drbqhm75o6v2mux47u

A simple and accurate matrix for model based photoacoustic imaging

K. J. Francis, Pradeep Mishra, P. Rajalakshmi, Sumohana S. Channappayya, Ashutosh Richhariya
2016 2016 IEEE 18th International Conference on e-Health Networking, Applications and Services (Healthcom)  
Accurate model-based methods in Photo-Acoustic Tomography (PAT) can reconstruct the image from insufficient and inaccurate measurements.  ...  We present a simple and accurate measurement matrix that is derived from the pseudo-spectral PAT model. The accuracy of the measurement matrix is first validated against the experimental PAT signal.  ...  Image reconstruction from the acoustic wave is performed mainly using analytical methods like back projection and time reversal.  ... 
doi:10.1109/healthcom.2016.7749481 dblp:conf/healthcom/FrancisMRCR16 fatcat:t7mzswtorva2hkyzodt75shw3i

2D multi-parameter waveform inversion of land reflection seismic data obtained from the particle-motion response from the vertical geophone

Qingyang Li, Guochen Wu
2020 Acta Geophysica  
The development of multi-wave and multi-component seismic exploration methods provides data that enable onshore elastic wave full-waveform inversion.  ...  our method, we carry out numerical tests via different inversion strategies, by using the P-wave data regarded as containing converted P-wave information, and get successful results.  ...  Acknowledgements The authors would like to acknowledge the support of the National Science and Technology Major Project, China: 2016ZX05024-001-008, and thank the reviewers for their valuable  ... 
doi:10.1007/s11600-020-00403-6 fatcat:7uffqmm33vgtbl7g6eo4r6pyyq

Applicability of MUSIC-Type Imaging in Two-Dimensional Electromagnetic Inverse Problems

Krishna Agarwal, Xudong Chen
2008 IEEE Transactions on Antennas and Propagation  
In this presentation, the multiple signal classification (MUSIC) method and the two-step least squares method are provided, with the former being used to locate pointlike scatterers and the latter being  ...  Electromagnetic inverse scattering problems for point-like scatterers are considered in this presentation. A scatterer can be treated as point-like when its size is much smaller than one wavelength.  ...  Inverse Scattering: MUSIC  MUSIC applied to detect objects:  In acoustics:  A. J. Devaney, 2000  S. Hou, Inverse Problems, 2006, 2007  A special case of factorization method  A.  ... 
doi:10.1109/tap.2008.929434 fatcat:fw6rkojqsjffbfe5bk7axfjgm4

Pseudo-time-reversal symmetry and topological edge states in two-dimensional acoustic crystals

Jun Mei, Zeguo Chen, Ying Wu
2016 Scientific Reports  
We develop an effective Hamiltonian model for the associated dispersion bands around the Brillouin zone center, and find the inherent link between the band inversion and the topological phase transition  ...  Technological applications and devices based on our design are expected in various frequency ranges of interest, spanning from infrasound to ultrasound.  ...  Acknowledgements This work was supported by the National Natural Science Foundation of China (Grant Nos 11274120 and 11574087) and King Abdullah University of Science and Technology (KAUST).  ... 
doi:10.1038/srep32752 pmid:27587311 pmcid:PMC5009350 fatcat:pb7fu7wwprabpisan7ttdcvfzq

Contribution of Seismic and Acoustic Methods to Reservoir Model Building [chapter]

Jean Luc, Frederick Delay
2011 Hydraulic Conductivity - Issues, Determination and Applications  
Hydraulic Conductivity -Issues, Determination and Applications 330 shear wave (only in fast formations), the fluid wave, two dispersive guided modes: the pseudo Rayleigh waves (only in fast formations)  ...  Acoustic logging allows the measurement of the propagation velocities and frequencies of the different waves which are recorded by an acoustic tool.  ...  www.intechopen.comHydraulic Conductivity -Issues, Determination and Applications www.intechopen.comContribution of Seismic and Acoustic Methods to Reservoir Model Building  ... 
doi:10.5772/22051 fatcat:4mcpjhdckre4tkkqlioy7z3xga

Artifact reduction in pseudo-acoustic modeling by pseudo-source injection [article]

Musa Maharramov
2014 arXiv   pre-print
I deploy it in the case of transversely isotropic media to implement a kinematically accurate fast finite-difference modeling method.  ...  I provide a framework for deriving fast finite-difference algorithms for the numerical modeling of acoustic wave propagation in anisotropic media.  ...  Adapting (3) for TTI media would require the application at each time step of 5 additional inverse FFTs for N = 2 and extra 16 inverse FFTs for N = 3.  ... 
arXiv:1410.7000v1 fatcat:mueb6zhrqrb5baxgcsyjgjihpy

Acoustic and photonic topological insulators by topology optimization

Rasmus E. Christiansen, Fengwen Wang, Søren Stobbe, Ole Sigmund, Nader Engheta, Mikhail A. Noginov, Nikolay I. Zheludev
2019 Metamaterials, Metadevices, and Metasystems 2019  
photonic and acoustic topological insulators. 1 This method relies on a carefully constructed model system combined with the application of density based topology optimization to design two carefully  ...  Through simple modifications of the method, we demonstrate that it is possible to design structures with different symmetry conditions from those that have previously been investigated using the method  ...  Acknowledgement The authors acknowledge support from NATEC (NAnophotonics for Terabit Communications) Centre (Grant No. 8692) and the Villum Foundation Young Investigator Programme.  ... 
doi:10.1117/12.2528504 fatcat:lpyvvhweovb3jebk75ipyw2lw4

An acoustic emission source localization approach based on time-reversal technology for additive manufacturing

Xiaodi Yang, Jiazhou Zhou, Chunming Gao, Ping Zhang, Tingting Liu, Kai Zhang, Changdong Zhang, J. Zhu
2022 MATEC Web of Conferences  
The simulation results demonstrate that the proposed method can position and monitor the random acoustic emission.  ...  Corresponding simulations is implemented, which are designed to verify the ability of detecting and positioning the workpiece stress release acoustic emission signal.  ...  Z (2) Time inverse normalize the acoustic emission signals received by each array element. (3) Send the inverse signal to its corresponding array element and transmitting it synchronously when each channel  ... 
doi:10.1051/matecconf/202235501008 fatcat:kbdpjinfs5ekpcqsjpowriork4
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