Abstract:
:The location of continuous acoustic emission sources is a difficult problem of non-destructive testing. This article describes one-dimensional location of continuous acoustic emission sources by using an intelligent locator. The intelligent locator solves a location problem based on learning from examples. To verify whether continuous acoustic emission caused by leakage air flow can be located accurately by the intelligent locator, an experiment on a thin aluminum band was performed. Results show that it is possible to determine an accurate location by using a combination of a cross-correlation function with an appropriate bandpass filter. By using this combination, discrete and continuous acoustic emission sources can be located by using discrete acoustic emission sources for locator learning.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Kosel T,Grabec I I,Muzic Pdoi
10.1016/s0041-624x(99)00079-7subject
Has Abstractpub_date
2000-03-01 00:00:00pages
824-6issue
1-8eissn
0041-624Xissn
1874-9968pii
S0041-624X(99)00079-7journal_volume
38pub_type
杂志文章相关文献
ULTRASONICS文献大全abstract::In this paper the behaviour of strongly nonlinear waves in axisymmetric resonators is experimentally and numerically studied. Experiments are carried out in a cylindrical cavity, which transversal dimension is bigger than the longitudinal one, excited by a narrow band transducer. The quality factor and displacement am...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2005.02.001
更新日期:2005-08-01 00:00:00
abstract::This paper proposes a new pair of sequences whose cross-correlation values are zero except for the peak value and presents a new modulation method for an ultrasonic Doppler flowmeter with high sensitivity utilizing these sequences. In this method, transmitted and received waves are modulated and demodulated, respectiv...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/0041-624x(79)90023-4
更新日期:1979-11-01 00:00:00
abstract::Ultrasonic wave tunneling through seriously mismatched media, such as steel and water, is possible only when the frequency matches the resonance of the steel plate. But it is nearly impossible to realize continuous wave tunneling if the low acoustic impedance media is air because the transducer frequency cannot be mad...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.07.018
更新日期:2018-01-01 00:00:00
abstract::Surface wave motions generated by a time-harmonic point load applied at the surface of an isotropic linearly elastic half-space are conventionally solved by the use of integral transform techniques. The inverse transforms, are often complicated and will not always yield closed-form solutions. In this paper expressions...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.05.003
更新日期:2014-09-01 00:00:00
abstract::A circular cylindrical piezoelectric transducer with radial polarization is proposed. The axial vibration characteristics of the transducer are studied by three different methods: analytical calculation, FEM simulation and experiment. The symmetric and asymmetric excitation conditions are discussed in the Haskins and ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2009.09.008
更新日期:2010-03-01 00:00:00
abstract::To increase the sensitivity of Lamb waves to hidden corrosion in aircraft structures, a preliminary step is to understand the phenomena governing this interaction. A hybrid model combining a finite element approach and a modal decomposition method is used to investigate the interaction of Lamb modes with corrosion pit...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2007.02.004
更新日期:2007-06-01 00:00:00
abstract::This paper suggests a method for high-sensitivity damage detection. The method is based on pitch-catch measurements of Lamb waves combined with a baseline subtraction technique in the frequency-wavenumber domain. Small amplitude converted modes, generated during the interaction of propagating waves with damage, can th...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2013.08.010
更新日期:2014-02-01 00:00:00
abstract::This paper provides a derivation of the Christoffel eigenvalue equation for acoustic wave propagation in an acoustically damped piezoelectric medium. The damping tensor is shown to couple into both the stress and displacement constitutive equations. Application of the quasi-static approximation leads to an additional ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.09.005
更新日期:2006-12-01 00:00:00
abstract::This paper focuses on transmission characteristics of fundamental symmetric Lamb mode (So) at the junction of a main waveguide and sub-waveguides in composite laminates. Numerical simulations on transmission of So from the main to sub-waveguide revealed that transmission factors of the modes depend on stacking sequenc...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2015.08.003
更新日期:2016-01-01 00:00:00
abstract::The Lamb waves are used for the ultrasonic characterization of welds because of their relative long-range propagation. In this paper, a simplified model of a weld-strip between two identical semi-infinite elastic layers is investigated. The reflected and transmitted ultrasonic fields are expressed by modal series whos...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2004.11.004
更新日期:2005-06-01 00:00:00
abstract::A cylindrical standing wave ultrasonic motor using bending vibration transducer was proposed in this paper. The proposed stator contains a cylinder and a bending vibration transducer. The two combining sites between the cylinder and the transducer locate at the adjacent wave loops of bending vibration of the transduce...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.12.007
更新日期:2011-07-01 00:00:00
abstract::It is necessary to identify speckled regions in ultrasound images to control adaptive speckle suppression algorithms, for tissue characterisation, and to estimate the elevational separation of B-scans by speckle decorrelation. Previous authors have proposed classification techniques based on second order powers of the...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00104-x
更新日期:2002-05-01 00:00:00
abstract::In many ultrasound applications-especially in the area of medical diagnostics-conventional sensors and particularly piezoelectric hydrophones do not comply with the requirements for "point detectors". It therefore suggests itself to develop methods, which allow ultrasonic fields to be reconstructed from the spatially ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00346-3
更新日期:2002-08-01 00:00:00
abstract:BACKGROUND AND MOTIVATION:Previous works investigating the radiation force of diverging spherical progressive waves incident upon spherical particles have demonstrated the direction of reversal of the force when the particle is subjected to a curved wave-front. In this communication, the analysis is extended to the cas...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.12.004
更新日期:2011-07-01 00:00:00
abstract::We propose a method for evaluating the size of the laser-induced breakdown region in water based on the detection and analysis of optodynamic waves. The breakdown region is an optodynamic source of pressure waves that propagate into the surrounding liquid as an ultrasonic pulse. In the experiment the optical breakdown...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.05.078
更新日期:2006-12-22 00:00:00
abstract::Lithium niobate, LiNbO(3), is a piezoelectric material well known for its high Curie temperature. However, it has often been neglected for use in ultrasonic transducers because of its low electro-mechanical coupling coefficients. Recent advances in signal processing have made this disadvantage less significant and we ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2007.06.001
更新日期:2007-12-01 00:00:00
abstract::Steel-concrete modular construction is increasingly used in nuclear structure construction. Conventional nondestructive testing methods are not able to detect internal concrete defects because the thick concrete wall is covered by steel plates. An ultrasonic guided method is proposed to detect honeycombs and voids aro...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2020.106096
更新日期:2020-04-01 00:00:00
abstract::Current medical ultrasonic scanning instrumentation permits the display of fine image detail (speckle) which does not transfer useful information but degrades the apparent low contrast resolution in the image. An adaptive two-dimensional filter has been developed which uses local features of image texture to recognize...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/0041-624x(86)90072-7
更新日期:1986-01-01 00:00:00
abstract::An approximate formula has been developed to determine the electromechanical coupling coefficient of the piezoelectric film in a four-layer composite resonator, which includes two electrodes. In this formula, the coupling coefficient can be calculated from the distribution of the effective coupling coefficients, k2eff...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00172-9
更新日期:2000-03-01 00:00:00
abstract::In this paper, the radial basis function (RBF) collocation method based on the nonlocal Eringen piezoelectricity theory is developed to compute the band structures of nanoscale multilayered piezoelectric phononic crystals taking account of nonlocal interface effects. Detailed calculations are performed for anti-plane ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2016.09.009
更新日期:2017-01-01 00:00:00
abstract::Guided modes propagation in intact, fractured and healing long bone has drawn significant research interests. However, mode quantifications for the direct comparison are still necessary to address. The aim of the study is to analyze the mode interaction with a notch-fracture in the long bone and find quantitative ultr...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2013.09.015
更新日期:2014-07-01 00:00:00
abstract::Most methods used to measure the thickness of thin liquid or solid surface films and coatings need access to the coated surface. In this work reflected ultrasonic pulses were used to measure a coating thickness from a solid back face. Piezoelectric transducers on the solid back face emitted ultrasound waves and receiv...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2020.106291
更新日期:2021-02-01 00:00:00
abstract::The characterization of brain tissue is crucial to better understand neurological disorders. Mechanical characterization is an emerging tool in that field. The purpose of this work was to validate a transient ultrasound technique aimed at measuring dispersion of mechanical parameters of the brain tissue. The first par...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.10.009
更新日期:2018-03-01 00:00:00
abstract::The acceptance of broadband ultrasound attenuation (BUA) for the assessment of osteoporosis suffers from a limited understanding of both ultrasound wave propagation through cancellous bone and its exact dependence upon the material and structural properties. It has recently been proposed that ultrasound wave propagati...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2015.09.009
更新日期:2016-02-01 00:00:00
abstract::It has been established that structural changes in a ferrofluid (formation of clusters) upon the effect of an external magnetic field can be effectively studied by ultrasound spectroscopy. In particular, the resonance absorption of ultrasonic waves enables detection and determination of the size of spherical clusters....
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00117-8
更新日期:2002-05-01 00:00:00
abstract::This paper presents the results of the theoretical and 2D FEM modeling excitation and detection of evanescent acoustic waves in piezoelectric plates. By application of 2D ordinary differential equations derived by Auld, we obtained the dispersion curves of A1 and SH1 waves in YX LiNbO3 and YX KNbO3 plates in proximity...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2019.105961
更新日期:2019-11-01 00:00:00
abstract::This paper presents a study on topology optimization of novel material microstructural configurations to achieve directional elastic wave propagation through maximization of partial band gaps. A waveguide incorporating a periodic-microstructure material may exhibit different propagation properties for the plane elasti...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.07.006
更新日期:2018-01-01 00:00:00
abstract::Ultrasonic flaw classification in weldment is an active area of research and many artificial intelligence approaches have been applied to automate this process. However, in the industrial applications, the ultrasonic flaw signals are not noise free and automatic intelligent defect classification algorithms show relati...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2018.12.001
更新日期:2019-04-01 00:00:00
abstract::In this paper, we propose a semi-analytical isogeometric analysis(S-IGA) approach in the twist space to investigate the dispersive properties in helical thread waveguides, which combines the advantages of the spectral approach and IGA. The convergence and accuracy of the proposed method are discussed, by comparing S-I...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.06.004
更新日期:2018-02-01 00:00:00
abstract::Theoretical formulation for the problem of second harmonic guided waves in pipes is presented from the principles of continuum mechanics. The formulation is carried out in the reference configuration of the pipe with an emphasis on the correct use of the "Divergence" operator in the reference configuration. Second har...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2012.12.007
更新日期:2013-04-01 00:00:00