Article
Engineering, Mechanical
Xianlei Guan, Rui Zhong, Bin Qin, Qingshan Wang, Wen Shao
Summary: The vibro-acoustic behaviors of combined elliptical-cylindrical-elliptical shells (CECES) are studied using the spectral-energy boundary element approach, establishing a dynamic model and overcoming mathematical difficulties with the CHIEF method. Numerical examples are used to investigate the influence of circumferential wave modes, boundary condition, and acoustic medium on CECES vibro-acoustic behaviors, contributing to preliminary design.
JOURNAL OF FLUIDS AND STRUCTURES
(2021)
Article
Acoustics
Jiawei Liu, Haibin Yang, Honggang Zhao, Yang Wang, Dianlong Yu, Jihong Wen
Summary: An effective homogenization model is crucial for simplifying acoustic scattering computations of underwater structures. A hybrid method combining Bloch wave analysis and retrieval technique is proposed to characterize the acoustic behavior of filled coatings backed with steel plate under external sound waves. The method's effectiveness is validated through numerical simulations and comparisons with traditional methods. The study investigates the influence of shear-wave effect and coupling effect on the homogenization model, providing a comprehensive understanding of effective acoustic behavior.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Acoustics
Shibo Wang, Bo Hu, Song Li, Lanyue Zhang, Jie Shi
Summary: This paper introduces an idea of embedding cavity numbers with gradient changes in a soft elastic medium to enhance low-frequency absorption capacity. The presented model provides a high sound absorption coefficient in specific frequency ranges. The results validate the effectiveness of the idea and offer a new approach for the design of low-frequency broadband sound absorption.
NOISE CONTROL ENGINEERING JOURNAL
(2022)
Article
Acoustics
Xiukun Li, Yushuang Wu, Ge Yu, Yifei Zou
Summary: The resonance characteristics of elastic acoustic scattering are important for buried target detection and identification. By using COMSOL models, the influence of a burial layer on Rayleigh wave and Whispering-Gallery wave are analyzed. The method of isolation and identification of resonance (MIIR) is used to obtain elastic resonances in free-field and buried conditions.
Article
Mechanics
Awantika Mishra, Yadwinder Singh Joshan, Sajan Kumar Wahi, Sushma Santapuri
Summary: In this work, a nonlinear coupled electro-magneto-elastic membrane model is developed for soft functional materials. The model is validated by analyzing an internally pressurized cylindrical membrane in an azimuthal magnetic field and radial electric field. Mechanical and electrical limit-point instabilities and their dependency on external fields are investigated using this model.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Acoustics
Gyani Shankar Sharma, Adrien Marsick, Laurent Maxit, Alex Skvortsov, Ian MacGillivray, Nicole Kessissoglou
Summary: An analytical framework for sound radiation from a fluid-loaded cylindrical shell covered with an acoustic coating is proposed, showing that the coating design can be tuned to reduce radiated sound in a broad frequency range.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Chemistry, Applied
Gabriel A. Montoya, Wesley W. Chapman, Joseph R. Lawrence, Terry R. Salyer, Steven F. Son
Summary: Internal features of differing scale and geometry in explosives systems have various effects on performance, from energy concentration and reaction to wave shaping. However, little experimental data exists on the effects of features in intermediate length scales. This study provides quantitative data on the effects of machined voids in PBX 9501, showing delay in detonation front propagation time, linear dependence on void diameter, and independent jet velocity. Both simulation and experimental results identified key re-initiation mechanisms for the studied void sizes, such as jetting and double shocking.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2023)
Article
Multidisciplinary Sciences
Lin Liu, Xiumei Zhang, Xiuming Wang, Xiao He, Hao Chen
Summary: The knowledge of acoustic wave propagation in a borehole embedded in gas hydrate-bearing sediments is essential for the exploitation of gas hydrate. This study introduces a real-axis integration method to calculate the borehole acoustic field in a three-phase porous medium based on the Biot-type three-phase theory. A component wave approach, combined with the branch-cut integral method and the residue theorem, is proposed to study the borehole wave propagation in a three-phase porous medium. The results provide a theoretical basis for the subsequent inversion of reservoir parameters.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Jianjun Wang, Yalei Cao, Hongjun Xiang, Zhiwei Zhang, Junrui Liang, Xin Li, Deyun Ding, Teng Li, Lihua Tang
Summary: Long-term monitoring of the vertical displacement and service status of steel springs is crucial for ensuring railway operational safety. To address the challenge of powering the monitoring system, a piezoelectric smart backing ring is designed to harvest kinetic energy induced by the fulcrum force in steel-spring isolators. Experimental and theoretical evaluations demonstrate the energy harvesting performance of the fabricated prototype, providing insights into key factors affecting its performance. Results indicate that the prototype can achieve a maximum average power of up to 500 mW, with the potential to reach 1 W by optimizing the design. The prototype can harvest approximately 12.74 J of energy per day from the steel-spring fulcrum force induced by passing trains, showcasing its potential for railway health monitoring applications.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Construction & Building Technology
Du Yinfei, Wang Jiacheng, Deng Haibin, Liu Yingchen, Tian Jun, Wu Xiaowei
Summary: Steel fiber asphalt mixture (SFAM) shows excellent performance in accelerating heat flow, but with the increase of steel fiber content, its deformation resistance gradually decreases. SFAM exhibits excellent resistance to low-temperature cracking and fatigue, and it is recommended to use 1.0% curved hook steel fiber to enhance asphalt mixture.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Sen Lin, Genbao Zhang, Junbo Sun, Shilin He, Changfu Chen, Amr M. Morsy, Xiangyu Wang
Summary: This paper presents an optimization algorithm for maximizing band-gap in cementitious composite design. Experimental and numerical analysis revealed the correlation between composite porosity and band structure. Results showed that specific material composition can achieve sound absorption coefficient exceeding 90% in a phononic crystal structure, with frequency consistent with theoretical band gap analysis.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Elsayed M. Abd-Elaziz, Mohamed I. A. Othman, Amnah M. Alharbi
Summary: This paper aims to investigate the impact of diffusion and rotation on a thermoelastic medium with voids in the context of the three-phase-lag model of thermoelasticity. The dimensionless governing equations are derived, and the exact expressions for various variables are obtained using the normal mode technique. The results are validated by comparing with other theories, and the effects of diffusion, rotation, and void parameters are explored graphically. Some interesting special cases are also derived from this study.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Engineering, Civil
Shuai Feng, Hiroshi Tagawa, Xingchen Chen
Summary: This study investigates the seismic performance of a system that combines a seesaw-twisting system (STS) with a cylindrical steel slit damper (CSSD). The results show that the STS with the CSSD efficiently reduces peak story drifts and allows the use of long steel rods for bracing.
Article
Chemistry, Analytical
Bart Scheeren, Miroslaw Lech Kaminski, Lotfollah Pahlavan
Summary: This paper introduces a method for using acoustic emission to monitor the condition of bearings, and presents an analytical framework for describing the propagation of ultrasonic waves through the geometry and interfaces of a bearing. Experimental results suggest that low to mid-frequency signals can retain enough energy to be potentially detected during transmission.
Article
Robotics
Yayun Du, Jacqueline Lam, Karunesh Sachanandani, M. Khalid Jawed
Summary: We present a numerical tool for simulating articulated soft robots, which considers the interaction between elastic rods, external forces, and other factors. The simulation results show reasonable quantitative agreement with experiments. Furthermore, we discover the optimal rotational speed and the effect of the number of flagella on the robot's performance. Our simulator has the potential for unknown physics exploration and provides insights into the mechanics of granular medium.
IEEE ROBOTICS AND AUTOMATION LETTERS
(2022)
Article
Engineering, Mechanical
Laurent Maxit, Mahmoud Karimi, Valentin Meyer, Nicole Kessissoglou
JOURNAL OF FLUIDS AND STRUCTURES
(2020)
Article
Acoustics
Briscoe Kerferd, Daniel Eggler, Mahmoud Karimi, Nicole Kessissoglou
JOURNAL OF SOUND AND VIBRATION
(2020)
Article
Acoustics
M. Karimi, L. Maxit, P. Croaker, O. Robin, A. Skvortsov, S. Marburg, N. Atalla, N. Kessissoglou
JOURNAL OF SOUND AND VIBRATION
(2020)
Article
Multidisciplinary Sciences
Daniel Eggler, Nicole Kessissoglou
SCIENTIFIC REPORTS
(2020)
Article
Acoustics
Jeffrey Peng, Jeffrey Parnell, Nicole Kessissoglou
Summary: This study introduces two supplementary noise indicators for road traffic noise, which differentiate between daytime and nighttime noise exposure impacts as well as heavy vehicle and commuter traffic noise. By analyzing these indicators, spatial variability of light and heavy vehicle traffic composition across urban and rural parts of a state road network in Australia is presented.
Article
Acoustics
Cikai Lin, Daipei Liu, Daniel Eggler, Nicole Kessissoglou
Summary: The study combines acoustic cloaking and illusions with numerical methods to handle more complex objects, demonstrating active acoustic cloaking and illusions on three-dimensional rigid objects. By utilizing a control system and error signals, illusional acoustic fields mimicking the presence of objects are generated.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Engineering, Mechanical
Cikai Lin, Gyani Shankar Sharma, Daniel Eggler, Laurent Maxit, Alex Skvortsov, Ian MacGillivray, Nicole Kessissoglou
Summary: The study presents the vibroacoustic response of a structurally excited cylindrical shell submerged in water coated with a soft elastic material embedded with circumferential arrays of resonant inclusions. Different coating designs with varying combinations of homogenised layers are examined to explore their effect on the shell's vibroacoustic response.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Acoustics
Esmaeel Eftekharian, Paul Croaker, Steffen Marburg, Daipei Liu, Nicole Kessissoglou
Summary: A new method combining the Lighthill source distribution with an acoustic impedance matrix is introduced to determine the contribution of aeroacoustic sources to sound power. The technique is demonstrated by examining the flow noise produced by a pair of co-rotating vortices and comparing the results with Mohring's analogy. The contribution of each component of the Lighthill tensor to sound power is presented for different wave numbers and vortex separation distances. This technique allows for the identification of dominant flow noise sources to sound power.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Gyani Shankar Sharma, Alex Skvortsov, Ian MacGillivray, Nicole Kessissoglou
Summary: A versatile analytical framework for resonance scattering of sound waves in soft materials with complex-shaped hard inclusions is proposed. Universal scaling relations for known parameters mapping resonant scattering of complex-shaped inclusions to sphere scattering are derived using analogies from hydrodynamics and electrostatics. Multiple scattering between inclusions is also considered. The problem is then treated using the effective medium theory, where a layer of hard inclusions is modeled as a homogenized layer with effective properties. The acoustic performance of hard inclusions is compared for a range of shapes with spheres of the same volume, and the results are in good agreement with finite element simulations.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Alex Skvortsov, Gyani Shankar Sharma, Ian MacGillivray, Nicole Kessissoglou
Summary: The study presents a theoretical framework for acoustic wave propagation in a metasurface with resonant inclusions, using an analogy between fluid dynamics and elastodynamics to account for multiple scattering effects. Analytical results are in excellent agreement with numerical simulations that accurately model the geometric and material properties of the metasurface.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Gyani Shankar Sharma, Alex Skvortsov, Ian MacGillivray, Nicole Kessissoglou
Article
Acoustics
Gyani Shankar Sharma, Beatrice Faverjon, David Dureisseix, Alex Skvortsov, Ian MacGillivray, Christian Audoly, Nicole Kessissoglou
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2020)
