Article
Engineering, Electrical & Electronic
Dengyi Huang, Junda Qin, Hao Liu, Joe H. Chow, Junbo Zhao, Tianshu Bi, Lamine Mili, Qixun Yang
Summary: Accurate estimation of electromechanical disturbance propagation in a power system is crucial for taking preventive, corrective, and in-extremis control actions. This paper proposes an analytical method based on electromechanical wave theory, which investigates disturbance propagation and studies disturbance attenuation and propagation degree. Numerical results on multi-machine chain network and IEEE 118-bus test system validate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Article
Engineering, Mechanical
Carlos-Omar Rasgado-Moreno, Madis Ratassepp
Summary: This study introduces a method for guided wave tomography of pipe bends, which provides accurate defect information by solving an inversion problem and using a synthetic dataset. To overcome the limitation of 2D models that do not consider the cyclic nature of pipes, a method based on the pipe geometry and geodesic equations of a torus is proposed to compute the propagation distance and separate the helical path trajectories. The results show that the geodesic distances preserve the information of the wavefront of interest.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Chemical
Tanuj Joshi, Om Parkash, Gopal Krishan, Anarghya A. Murthy
Summary: Slurry transportation through a pipeline is complex and requires high suspension stability and energy to deliver solid materials. Most studies only focus on basic parameters for uni-model slurry systems, ignoring the effects of multiple particles. This study investigates the characteristics of bi-model slurry flow through a horizontal bend, revealing that a slurry mixture ratio of 65:35 is the most efficient for long-term transportation due to a significant pressure drop.
Article
Engineering, Multidisciplinary
M. Osika, A. Ziaja-Sujdak, R. Radecki, W. J. Staszewski
Summary: The Luxembourg-Gorky (L-G) effect for elastic shear horizontal guided waves is investigated using a new non-classical theoretical model of wave dissipation. The experimental results, validated with numerical simulations, not only explain the acoustic equivalent of the L-G effect but also demonstrate the influence of damage severity and carrier frequencies on the nonlinear modulation transfer behind this effect. The findings align well with the analytical models explaining the original L-G effect for electromagnetic waves.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Linhao Wang, Jiang Xu, Dong Chen
Summary: This article introduces the use of PPM EMAT to detect defects in aircraft pipeline bends. By establishing a simulation model and experimental verification, the propagation characteristics and defect detection capability of T (0, 1) mode-guided waves in bend pipes were studied.
Article
Geosciences, Multidisciplinary
O. G. Sanford, N. Schofield, R. W. Hobbs, R. J. Brown
Summary: Imaging subsurface igneous sill complexes is a seismic challenge due to a lack of understanding of the interaction between geological structures and the seismic wavefield. This study uses high-resolution seismic modeling to show that only a small amount of energy passes through the sills to reach the target reflector. Factors limiting energy transmission include internal multiples, converted modes, and leaky guided waves within the sills. Further research should focus on optimizing the processing of seismic data to improve imaging around sill complexes.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Mathematics, Applied
Hani Alahmadi
Summary: This article discusses the scattering in a trifurcated guided wave with hard and flexible exterior surfaces. A comprehensive solution is obtained through formulation of the boundary value problem and modes matching. The solution is validated through analytical and numerical tests, and provides insights into power transmission and frequency. The findings aid the understanding and development of waveguide systems and have practical applications in complex wave propagation.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Chemistry, Analytical
Carlos-Omar Rasgado-Moreno, Marek Rist, Raul Land, Madis Ratassepp
Summary: In this study, a two-dimensional acoustic forward model was developed to replace the complex three-dimensional bend domain, allowing the monitoring and prediction of the whole bend area in guided wave tomography by using Thomsen parameters to make the rectangular domain artificially anisotropic.
Article
Engineering, Civil
X. Zhu, K. Takimoto, H. Tanaka
Summary: Research on the shear properties of rectangular steel pipes (RSPs) as shear connectors in composite slabs showed that factors such as constraint, concrete strength, RSP dimensions, and welding length have significant effects on the shear capacity of RSPs, while the concrete stiffness has a minor influence. Comparison with Japan Society of Civil Engineers (JSCE) equations for L-shaped channels shear capacity was also conducted.
Article
Mechanics
Gabriel Nunez, Rodolfo Venegas, Tomasz G. Zielinski, Francois-Xavier Becot
Summary: This paper investigates sound propagation in polydisperse heterogeneous porous composites using the two-scale asymptotic method of homogenization. The results demonstrate that multiple pressure diffusion phenomena in heterogeneous inclusions contribute to the dissipation of sound energy, and combining materials with highly contrasted permeabilities can improve the acoustic absorption of the composite. The developed theory provides fundamental insights into the design of novel acoustic materials.
Article
Acoustics
Jinxia Liu, Ziyue Li, Zhiwen Cui, Linna Fu, Tribikram Kundu
Summary: This paper investigates the acoustic field of a fluid-filled pipe under axial stress using the acoustoelastic theory. The pipe can be approximated as a transversely isotropic pipe, and its acoustic fields are expressed using potential functions. The velocity changes of longitudinal wave modes with applied stresses in an oil-filled pipe are analyzed analytically. The study finds that the velocity changes of longitudinal wave modes are almost uniformly influenced by applied stresses and that they are sensitive to stress in the high speed and low frequency plateaus. The relationship between stress and the velocity change of guided waves is provided, indicating the potential of using longitudinal wave modes for non-destructive testing and monitoring of stress levels in pipe structures.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
P. H. M. C. Matos, D. A. das Neves, S. C. Vieira, C. V. Der Geest, D. M. Iceri, M. S. Castro, A. T. Fabro
Summary: This paper investigates the bending wave propagation in horizontal ducts conveying intermittent flow. A periodic unit cell model is used to describe the intermittent flow, and the wave dispersion characteristics are analytically calculated. The results reveal the distortion effect of periodic flow and the asymmetry in wave propagation, and the experimental verification shows the feasibility of this approach.
Article
Acoustics
Peng Guo, Qizheng Zhou
Summary: This paper presents an analytical, numerical, and experimental investigation on the transverse vibrations of a finite beam with periodically arrayed beam-like resonators. The study establishes a continuous-discrete model and derives analytical solutions for the coupling vibration equations. The results show that the finite locally resonant beam exhibits low-frequency bandgaps, which can be controlled by adjusting the periodic number of resonators.
SHOCK AND VIBRATION
(2022)
Article
Chemistry, Physical
Tanuj Joshi, Om Parkash, Gopal Krishan
Summary: This work investigates the slurry flow characteristics of bottom ash particulates in a horizontal pipe bend at different Prandtl numbers. The study reveals the influence of bottom ash concentration, flow velocity, and Prandtl number on pressure drop and predicts the distribution of granular pressure, granular temperature, and wall shear stress across the bend cross section.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Chemical
Yudong Yan, Yanlin Zhao, Jun Yao, Chi-Hwa Wang
Summary: By utilizing LES and Lagrangian particle tracking technique, particle-laden turbulent flow under saturated electrostatic field in a 90-degree bend pipe was investigated. The results indicated higher particle concentration in the outer bend compared to the inner bend, with increased particle concentration near the wall under the presence of electrostatics but decreased concentration in the core region at the bend.
Article
Acoustics
O. Akanji, Jia Yang, David Hutchins, Peter J. Thomas, Lee A. J. Davis, Sevan Harput, Steven Freear, Pierre N. Gelat, Nader Saffari
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2016)
Article
Materials Science, Characterization & Testing
Ikhsan Mohamed, David Hutchins, Lee Davis, Stefano Laureti, Marco Ricci
NONDESTRUCTIVE TESTING AND EVALUATION
(2017)
Article
Acoustics
D. A. Hutchins, J. Yang, O. Akanji, P. J. Thomas, L. A. J. Davis, S. Freear, S. Harput, N. Saffari, P. Gelat
Article
Nanoscience & Nanotechnology
S. Laureti, D. A. Hutchins, L. A. J. Davis, S. J. Leigh, M. Ricci
Article
Acoustics
P. G. Gelat, J. Yang, O. Akanji, P. J. Thomas, D. Hutchins, S. Harput, S. Freear, N. Saffari
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2017)
Article
Materials Science, Characterization & Testing
Giuseppe Silipigni, Pietro Burrascano, David A. Hutchins, Stefano Laureti, Roberto Petrucci, Luca Senni, Luigi Torre, Marco Ricci
NDT & E INTERNATIONAL
(2017)
Article
Physics, Applied
Sevan Harput, James McLaughlan, David M. J. Cowell, Pierre Gelat, Nader Saffari, Jia Yang, Omololu Akanji, Peter J. Thomas, David A. Hutchins, Steven Freear
PHYSICAL REVIEW APPLIED
(2017)
Article
Chemistry, Analytical
Stefano Laureti, Muhammad Khalid Rizwan, Hamed Malekmohammadi, Pietro Burrascano, Maurizio Natali, Luigi Torre, Marco Rallini, Ivan Puri, David Hutchins, Marco Ricci
Article
Chemistry, Analytical
David A. Hutchins, Richard L. Watson, Lee A. J. Davis, Lolu Akanji, Duncan R. Billson, Pietro Burrascano, Stefano Laureti, Marco Ricci
Article
Chemistry, Analytical
Akram Zitoun, Steven Dixon, Graham Edwards, David Hutchins
Article
Chemistry, Analytical
Akram Zitoun, Steven Dixon, Mihalis Kazilas, David Hutchins
Summary: This study investigates the vibrational ultrasonic response of a thin magnetostrictive patch bonded to a glass plate, and demonstrates that the vibration of the patch can be controlled and enhanced by optimizing the magnetic fields.
Article
Chemistry, Analytical
Stefano Laureti, Marco Mercuri, David A. A. Hutchins, Felice Crupi, Marco Ricci
Summary: This study proposes a modified FMCW-based scheme that improves performance below 50 mm through a time-shift of the reference signal. Numerical and experimental evaluations show a significant enhancement in performance compared to the standard FMCW and close similarity to the correlation approach. This work paves the way for the future use of FMCWs in applications requiring high precision.
Article
Chemistry, Analytical
Akram Zitoun, Steven Dixon, Mihalis Kazilas, David Hutchins
Summary: The study investigates the use of thin magnetostrictive patches for defect detection using guided waves in composite samples. The SH0 shear horizontal guided waves were generated in CFRP and GFRP plates using a magnetostrictive patch transducer. Images of defects were reconstructed using the synthetic aperture focusing technique (SAFT) based on multiple transmission and detection locations. The results for imaging defects in both CFRP and GFRP materials are presented.
Proceedings Paper
Physics, Applied
Xiaokang Yin, Zhen Li, An Yan, Wei Li, Guoming Chen, David. A. Hutchins
42ND ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: INCORPORATING THE 6TH EUROPEAN-AMERICAN WORKSHOP ON RELIABILITY OF NDE
(2016)
Proceedings Paper
Acoustics
P. Gelat, J. Yang, P. J. Thomas, D. A. Hutchins, O. Akanji, L. A. J. Davis, S. Freear, S. Harput, N. Saffari
14TH ANGLO-FRENCH PHYSICAL ACOUSTICS CONFERENCE (AFPAC2015)
(2016)