Article
Mechanics
Rongyu Xia, Shixuan Shao, Jianlin Yi, Kaihong Zheng, Mehrdad Negahban, Zheng Li
Summary: In this study, a method of connecting piezoelectric bimorph plates to a periodic arrangement of electric circuits is proposed, and the decoupling or hybridization of multi-mode Lamb waves is achieved by changing the electric boundary conditions. The research results are of great significance for controlling guided wave propagation and developing nondestructive testing techniques in engineering applications.
COMPOSITE STRUCTURES
(2022)
Article
Mathematics, Applied
E. J. P. Miranda, S. F. Rodrigues, C. Aranas, J. M. C. Dos Santos
Summary: The study presents new formulations for analyzing the complex dispersion relation of flexural waves in a metamaterial Mindlin-Reissner thick plate with multiple periodic resonators, using the PWE and EPWE methods. These formulations provide more accurate results at higher frequencies compared to traditional thin plate theories. Multiple periodic resonators with multiple degrees of freedom attached to metamaterial plates broaden the applications for wave attenuation in high frequencies.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2022)
Article
Acoustics
Anusree Ray, Abhishek K. Singh
Summary: This study focuses on the impact of interface defects on the performance of structural components used in aircraft technology and underwater navigation, with particular emphasis on the role of P-wave reflection imaging. The analysis includes the reflection and refraction phenomena of quasi-pressure waves on imperfect corrugated interfaces, as well as the characteristics of irregular bulk waves.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Josue G. Gonzalez, Pratap N. Sahay, Tobias M. Muller
Summary: The missing fluid vorticity in Biot theory leads to the prediction of only one shear wave, with a noticeable filtration field at high frequencies that contradicts the no-slip condition. By incorporating the fluid viscous stress tensor, a second shear wave can be predicted, satisfying the no-slip condition and making the S-wave reflection/transmission across a discontinuity physically meaningful.
Article
Optics
Diego M. Solis, Raphael Kastner, Nader Engheta
Summary: This study investigates the issue of temporal discontinuity in an unbounded medium with Lorentzian dispersion, which leads to two shifted frequencies due to the second-order nature of the dielectric function. Additional temporal boundary conditions are required to describe the generation of two forward and two backward plane waves in response to a forward-only plane wave.
PHOTONICS RESEARCH
(2021)
Article
Acoustics
Shuaixing Wang, Yong Xiao, Jintao Gu, Chenying Hu, Hao Zhang, Jihong Wen
Summary: To insulate low-frequency sound in lightweight structures, double-panel metastructures (DPMSs) composed of two layers of metamaterial plates lined with a porous material (PM) layer are proposed. An efficient semi-analytical approach based on the transfer matrix method is used to predict the sound transmission loss (STL) of the DPMS with PM. Parameters affecting the STL are analyzed, and it is demonstrated that the DPMS lined with PM can achieve significantly higher diffuse field STL than the mass law at low frequencies below 500 Hz.
Article
Acoustics
E. J. P. Miranda Jr, V. F. Dal Poggetto, N. M. Pugno, J. M. C. Dos Santos
Summary: This study focuses on the design of phononic crystals in viscoelastic thin plates, and derives the complex band structure using the extended plane wave expansion (EPWE) method, considering the Kirchhoff-Love plate theory and viscosity effects. The study found that viscoelasticity has a significant impact on the propagation and evanescent behavior of phonons, and the maximum wave attenuation occurs at a specific filling fraction.
Article
Engineering, Multidisciplinary
Namho Joh, Jun Won Kang
Summary: This paper introduces a method for reconstructing the spatial distribution of permittivity in heterogeneous infinite domains using measured electric field intensities. By utilizing perfectly matched layer (PML) absorbing boundaries and optimization scheme based on Maxwell's equations, the full-waveform inversion successfully recovers different permittivity profiles, both smooth and sharply varying.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Physics, Applied
Abdulkafi M. Saeed, Kh. Lotfy, A. El-Bary, M. H. Ahmed
Summary: This paper examines a one-dimensional elastic-electronic deformation problem under the influence of a magnetic field and studies the non-homogeneous properties of semiconductor materials in the context of photo-thermoelasticity theory. The analytical solutions of key physical field distributions are obtained using Laplace transform techniques, and comparisons are made regarding the influence of parameters when considering thermal memories.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
A. K. Singh, Sonam Singh, Siddhartha Koley
Summary: The mechanism of Nondestructive testing involves imaging the reflection of Primary wave in piezo composites using a transmitter and receiver circuit, transducer tool, and display devices. The present study aims to explore the reflection of plane waves in a highly anisotropic material.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Automation & Control Systems
Hossein Saghlatoon, Rashid Mirzavand, Pedram Mousavi
Summary: This article introduces an all-in-one system for detecting the relative permittivity of samples in direct contact with a sensor antenna based on frequency variation detection. The system converts sensing information to voltage for transmission and frequency adjustment, and is able to monitor changes in antenna characteristics when in contact with sensing materials. By utilizing components of a conventional transmitter, the system effectively maintains power consumption and costs.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
E. P. A. Ribeiro, F. V. Lopes, K. M. Silva, A. G. Martins-Britto, Raphael L. A. Reis, Caio M. Moraes, Rodrigo L. Agostinho, Marco A. M. Rodrigues
Summary: This paper presents an interpolation-based solution for traveling wave (TW)-based algorithms when using lower sampling rates. It compares two phasor (PH)-based and one TW-based fault location methods with the proposed technique through ATP fault simulations. The results show that the proposed interpolation-based technique is reliable and suitable for TW-based fault location using lower sampling rates, and its accuracy is comparable to classical TW-based fault location solutions.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Astronomy & Astrophysics
Xianshu Wu, Chao Shen, Jingchun Li, Jiaqi Dong, Kehua Li
Summary: In this study, test particle simulations were used to verify the nonlinear heating of low-frequency Alfven waves on ions and analyze the underlying process. The results show that low-frequency Alfven waves can periodically pick up ions, leading to oscillations of average parallel velocity and temperature of the plasma by phase mixing, ultimately resulting in the stabilization of acceleration. Furthermore, an analysis was developed to estimate the time required for heating and accelerating. The presence of more chaotic modes does not necessarily result in better wave heating, and the effect of random phases on the heating process was also discussed.
ASTROPHYSICAL JOURNAL
(2023)
Article
Mechanics
Mustapha Sadouki
Summary: An improved acoustic method using low-frequency ultrasonic waves was proposed to measure the properties of porous materials. The inverse problem was solved numerically in the frequency domain to optimize multiple parameters, and tests were conducted on plastic foam samples. Results were discussed and compared to literature data.
Article
Acoustics
Fatima Zahraa Kachkouch, Herve Franklin
Summary: This article investigates the Rayleigh mode (also known as generalized Rayleigh wave) at the flat interface between a liquid and a double porosity medium saturated by the same liquid. The double porosity medium follows the phenomenological model of Berryman and Wang (2000) and allows the concurrent propagation of three longitudinal waves and one transverse wave. Assuming open pore conditions at the interface, formulas are derived for the reflection coefficients in the liquid and transmission coefficients in the double porosity medium. By considering only the angular variable in the study, numerical simulations based on Berea sandstone data demonstrate the influence of frequency and the two types of porosity on the reflection coefficient and velocity of the generalized Rayleigh wave.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Acoustics
Tongyang Shi, Yangfan Liu, J. Stuart Bolton
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2019)
Article
Thermodynamics
Diane N. Collard, Trevor J. Fleck, Jeffrey F. Rhoads, Steven F. Son
Summary: Altering the reactivity of aluminum/polyvinylidene fluoride (Al/PVDF) enables the design of printable reactive filaments with consistent burning rates for use in reactive propellant cores. Selection of fuel particles and stoichiometry reliably produces moderate burning rates, but mixed formulations show inconsistency in the mid-range burning rates.
COMBUSTION AND FLAME
(2021)
Article
Engineering, Electrical & Electronic
Allison K. Murray, Joseph R. Meseke, Nikhil Bajaj, Jeffrey F. Rhoads
Summary: This study developed an array of oscillator-based sensors for detecting volatile organic compounds, utilizing inkjet printing to deposit chemical substances and creating a regression model to relate frequency shifts to specific analyte concentrations. The use of FPGA technology allowed for monitoring 16 independent channels simultaneously.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Applied
Trevor J. Fleck, Timothy D. Manship, Steven F. Son, Jeffrey F. Rhoads
Summary: By varying the constituents of an aluminum/polyvinylidene fluoride multifunctional energetic structural material, the structural and energetic properties of the material were influenced. It was observed that different solids loading significantly altered the modulus of elasticity and ultimate strength of the material. Additionally, utilizing thermochemical code and burning rate measurements provided insights into the combustion performance of the formulations.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2021)
Article
Thermodynamics
Zane A. Roberts, Steven F. Son, Jeffrey F. Rhoads
Summary: Thermally dissipated energy from periodic mechanical action can lead to the creation of hot spots in heterogeneous composite materials, resulting in delamination and increased heating. Controlled development of hot spots near explosive crystals embedded in polymer allows for the study of heat generation mechanisms to inform our understanding of explosive initiation.
COMBUSTION AND FLAME
(2022)
Article
Computer Science, Interdisciplinary Applications
Chuhao Wu, Jennifer DeBoer, Jeffrey F. Rhoads, Edward Berger
Summary: Worked examples are important tools for teaching problem-solving skills in physics and engineering. Presenting worked examples in a multimedia format can provide extra support to the learning process. However, different strategies in using worked examples can lead to varying outcomes. The study found that students' video usage behaviors and their interaction with worked-example videos can have an impact on problem-solving efficiency and outcomes.
COMPUTER APPLICATIONS IN ENGINEERING EDUCATION
(2022)
Article
Physics, Applied
Allison R. Range, Nicole R. McMindes, Jacob Morris, Bryce A. Geesey, Jeffrey F. Rhoads
Summary: This work investigates the thermomechanical response of polymer-bonded composite energetic materials to high-frequency mechanical excitation. Cylindrical samples were fabricated and experiments were conducted to analyze the thermal and mechanical response using laser Doppler vibrometry and infrared thermography. The results show that samples with higher aluminum additive content exhibit greater temperature increases.
JOURNAL OF APPLIED PHYSICS
(2022)
Correction
Physics, Applied
Allison R. Range, Nicole R. McMindes, Jacob Morris, Bryce A. Geesey, Jeffrey F. Rhoads
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Acoustics
Zhuang Mo, Guochenhao Song, Kang Hou, J. Stuart Bolton
Summary: In this study, an iterative method based on the four-microphone transfer matrix approach was developed to evaluate the sound speed and attenuation constant of air within a standing wave tube. Experimental results showed that the previously proposed semi-empirical formula and theoretical formulation accurately matched the measured sound speed and attenuation constant, and outperformed the formula recommended in the ASTM E1050 standard in describing the variation of sound speed with frequency.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Chemistry, Applied
Kyle E. Uhlenhake, Diane N. Collard, Alexander C. Hoganson, Alex D. Brown, Sara Fox, Metin Ornek, Jeffrey F. Rhoads, Steven F. Son
Summary: Aluminum (Al) and polyvinylidene fluoride (PVDF) composites have unique applications in the field of energetic materials. This study investigates the ignition characteristics of additively manufactured micro- and nano-Al/PVDF composites through hotwire ignition tests. The results show that the size of aluminum particles has a significant impact on the burning rate, ignition characteristics, and flame temperatures of the composites.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2023)
Article
Education & Educational Research
Nick A. Stites, Edward Berger, Jennifer DeBoer, Jeffrey F. Rhoads
Summary: This study investigated the relationship between students' resource-usage patterns and their course grades, identifying two patterns associated with higher and lower achievement. Based on these findings, general resource-usage suggestions for all students were developed, highlighting the importance of investigating specific student subgroups for a better understanding of experiences and achievements.
EUROPEAN JOURNAL OF ENGINEERING EDUCATION
(2021)
Article
Engineering, Electrical & Electronic
Nikhil Bajaj, Jennifer S. Laster, Bryan W. Boudouris, George T. -C. Chiu, Jeffrey F. Rhoads
IEEE SENSORS LETTERS
(2020)
Article
Education, Scientific Disciplines
Rohit Kandakatla, Edward J. Berger, Jeffrey F. Rhoads, Jennifer DeBoer
INTERNATIONAL JOURNAL OF ENGINEERING PEDAGOGY
(2020)
Article
Education & Educational Research
David Evenhouse, Rohit Kandakatla, Edward Berger, Jeffrey F. Rhoads, Jennifer DeBoer
EUROPEAN JOURNAL OF ENGINEERING EDUCATION
(2020)
Proceedings Paper
Engineering, Mechanical
Ang Li, Jun Chen, Yangfan Liu, Stuart Bolton, Patricia Davies
PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2019, VOL 3A
(2019)