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-IGA results with reference solutions. Additionally, the analytical expression of axial offset wavenumbers is derived to explain the difference of spectrograms between the Cartesian and twisted systems. In order to illustrate the effectiveness of the proposed method, some dispersion curves of elastic wave propagation in helical thread waveguides are presented for a wide range of thicknesses and tortuosities.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Liu Y,Han Q,Liang Y,Xu Gdoi
10.1016/j.ultras.2017.06.004subject
Has Abstractpub_date
2018-02-01 00:00:00pages
126-136eissn
0041-624Xissn
1874-9968pii
S0041-624X(16)30339-0journal_volume
83pub_type
杂志文章相关文献
ULTRASONICS文献大全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::This paper presents a novel linear piezoelectric motor which is suitable for rapid ultra-precision positioning. The finite element analysis (FEA) was applied for optimal design and further analysis, then experiments were conducted to investigate its performance. By changing the input signal, the proposed motor was fou...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2016.07.010
更新日期:2016-12-01 00:00:00
abstract::An experimental ultrasonic sonar for use as a sensory aid with blind children is described. Novel signal processing techniques make the aid relatively simple to construct, yet allow many of its parameters to be changed in the field. In particular, the aid has two features, a variable range code and an automatic level...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/0041-624x(79)90010-6
更新日期:1979-01-01 00:00:00
abstract::3D ultrasound is a promising imaging modality for clinical diagnosis and treatment monitoring. Its cost is relatively low in comparison with CT and MRI, no intensive training and radiation protection is required for its operation, and its hardware is movable and can potentially be portable. In this study, we developed...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2004.05.003
更新日期:2005-01-01 00:00:00
abstract::The objective of this paper is to develop a nondestructive method for estimating the fracture toughness (K(IC)) of CrMoV steels used as the rotor material of steam turbines in power plants. To achieve this objective, a number of CrMoV steel samples were heat-treated, and the fracture appearance transition temperature ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(03)00154-9
更新日期:2003-09-01 00:00:00
abstract::The objective of this study was to examine the potential of ultrasonic velocity as a rapid and nondestructive method to predict the dimensional stability of oak (Quercus petraea (Mattuschka) Lieblein) and chestnut (Castanea sativa Mill.) that are commonly used in flooring industry. Ultrasonic velocity, specific gravit...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2015.11.007
更新日期:2016-03-01 00:00:00
abstract::The ultrasound-induced harmonic microbubble response spectrum is known to shift to lower frequencies with increasing tissue attenuation. We hypothesized that this shift could be reproducibly detected in received broadband radiofrequency spectra. We used an automatic Gaussian curve-fitting technique to measure the mean...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00397-9
更新日期:2003-03-01 00:00:00
abstract::Spatial dispersion is the variation of wave speed with wavelength. It sets in when the acoustic wavelength approaches the natural scale of length of the medium, which could, for example, be the lattice constant of a crystal, the repeat distance in a superlattice, or the grain size in a granular material. In centrosymm...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.05.215
更新日期:2006-12-22 00:00:00
abstract::Diversity of acoustic streaming field in a 2D rectangular chamber with a traveling wave and using water as the acoustic medium is numerically investigated by the finite element method. It is found that the working frequency, the vibration excitation source length, and the distance and phase difference between two sepa...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.11.015
更新日期:2015-04-01 00:00:00
abstract::In most applications of MEMS the mechanical properties of the used materials are key parameters for the perfect working of the microsystems. Measuring bulk acoustic waves excited in MEMS structures with ultra-short laser pulses is a powerful method for the accurate and non-destructive evaluation as well as for the cha...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2004.01.049
更新日期:2004-04-01 00:00:00
abstract::Several aspects of spectral analysis of bubble transients in Doppler ultrasonic decompression data are discussed. The computation of energy density spectra, using fast Fourier transform techniques for analyzing bubble transients, is described. Spectral analysis of data from probes implanted within animals, using a con...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/0041-624x(77)90026-9
更新日期:1977-05-01 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::In this paper, we investigated theoretically and experimentally the effect of the conductivity of the film located in the immediate vicinity of the free side of a piezoelectric resonator based on the PZT ceramics on its characteristics. It is shown that with increasing the conductivity of the film at first the paralle...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2018.09.016
更新日期:2019-04-01 00:00:00
abstract::The purpose of this study is to evaluate whether a 5-repetition liver stiffness (LS) measurement as the standard protocol of shear wave elastography (SWE) is comparable to a conventional 10-repetition measurement protocol and to identify factors that influence the reliability of the 5-repetition protocol. A total of 3...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2016.08.005
更新日期:2016-12-01 00:00:00
abstract::In this study, we investigated the bubble induced serious damage to tissue mimic exposed to 27-kHz ultrasound. The initial bubble radius ranged from 80 to 100 μm, which corresponded approximately to the experimentally-evaluated resonant radius of the given ultrasound frequency. The tissue mimic consisted of 10 wt% gel...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.03.011
更新日期:2014-08-01 00:00:00
abstract::The radial variations in the velocity of longitudinal waves propagating through Japanese cedar and Japanese cypress were experimentally investigated. In addition, the tracheid length (TL), microfibril angle (MFA), air-dried density (AD), and moisture content (MC) were measured in order to determine the effect of wood ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.10.001
更新日期:2011-04-01 00:00:00
abstract::The present study investigated the effect of geometric parameters of the ultrasound instrument during meat salting in order to enhance salt diffusion and salt distribution in pork meat on a lab scale. The effects of probe size (∅2.5 and 1.3cm) and of different distances between the transducer and the meat sample (0.3,...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.03.017
更新日期:2018-02-01 00:00:00
abstract::Both pinnae of anaesthetized male guinea-pigs were contused in a reproducible manner and one immediately treated with 0.75 MHz ultrasound at an average therapeutic intensity of 0.61 W cm-2 for a period of 2 min. The lividity and rate of resorption of the rusultant bruises were measured by a photometric method. The res...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/0041-624x(78)90021-5
更新日期:1978-09-01 00:00:00
abstract::The correlation between ultrasonic wave propagation and polycrystalline microstructures has significant implications in nondestructive evaluation. An original numerical approach using the finite element method to quantify in both time and frequency domains the ultrasonic noise scattering due to the elastic heterogenei...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2018.02.008
更新日期:2018-07-01 00:00:00
abstract::Machining temperature is a key factor in ultrasonic vibration-assisted milling as it can significantly influence tool wear rate and residual thermal stresses. In current study, a physics-based analytical predictive model on machining temperature in ultrasonic vibration-assisted milling is proposed, without resorting t...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2020.106212
更新日期:2020-12-01 00:00:00
abstract::This paper presents a method which combines electromagnetic simulation and ultrasonic simulation to build EMAT array models. For a specific sensor configuration, Lorentz forces are calculated using the finite element method (FEM), which then can feed through to ultrasonic simulations. The propagation of ultrasound wav...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2015.10.020
更新日期:2016-03-01 00:00:00
abstract::The film condensation of vapor on a cooled, downward-facing surface is a complex dynamic fluid phenomenon. This paper will describe the theoretical basis, instrumentation approach, and experimental results for a method for ultrasonic monitoring of film condensation. The ultrasound measurement system utilizes a 10 MHz ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00214-0
更新日期:2000-03-01 00:00:00
abstract::It is shown that a diffuse field is not devoid of phase information, but has a correlation function equal to the Green's function. More specifically, the cross-correlation between diffuse signals in two transducers is very nearly equal to the direct response of one transducer to an impulse applied to the other. This i...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00156-7
更新日期:2002-05-01 00:00:00
abstract::A mathematical model is developed and presented to capture the effect of viscoelastic nature of a material on modulated ultrasound (US) pulses. The model is established by considering perturbation of material elements subject to modulated US pulses and by introducing the exponential relaxation of the perturbed fluid e...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2014.05.014
更新日期:2014-09-01 00:00:00
abstract::In this paper a high intensity focused ultrasound (FUS) phantom model was developed, in order to be used in experiments for Blood Brain Barrier (BBB) disruption. The target was to create a phantom model that represents the disruption of the BBB during ultrasound application. An appropriate experimental setup was creat...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2020.106244
更新日期:2021-02-01 00:00:00
abstract::Investigation was carried out to study the effects of maximum aggregate size (MAS) (12.5mm, 19.0mm, 25.0mm, 37.5mm, and 50.0mm) on ultrasonic pulse velocity (UPV) of concrete. For investigation, first class bricks were collected and broken to make coarse aggregate. The aggregates were tested for specific gravity, abso...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2016.04.006
更新日期:2016-07-01 00:00:00
abstract::Elasticity assessment based on bulk wave velocity (BWV) measurements is the most popular technique to characterize the anisotropic stiffness tensor in cortical bone. Typically, a cuboid bone specimen is cut with its sides along the different anatomical directions. Then, the velocity of shear and longitudinal waves pro...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.05.009
更新日期:2017-09-01 00:00:00
abstract::An eight-channel ultrasonic detecting device for microbiological quality evaluation of packed liquid foods is presented in this paper. This device makes possible a non-invasive detection of the microbial growth in liquid foods with no need to open the carton-based packages where they are contained. Thermal and humidit...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.07.011
更新日期:2006-12-01 00:00:00
abstract::A new type of optical fiber hydrophone is constructed with a fiber Bragg grating (FBG) based on the intensity modulation of laser light in an FBG under the influence of sound pressure. The FBG hydrophone shows linearity, with dynamic range about 70 dB. It can measure amplitude and phase of an acoustic field in real ti...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00105-5
更新日期:2000-03-01 00:00:00
abstract::As known, anomalous resisto-acoustic effect is a fundamental property for weakly inhomogeneous piezoactive waves (Bleustein-Gulyaev, Love, and some leaky waves). It consists in that the velocity of aforementioned waves first increases, achieves its maximum, and only then decreases with increasing conductance of a laye...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2015.01.007
更新日期:2015-05-01 00:00:00