Article
Engineering, Mechanical
Rosaria Del Toro, Andrea Bacigalupo, Marco Lepidi, Andrea Mazzino
Summary: This paper investigates the influence of heterogeneous multi-phase cells on the propagation of multifield Bloch waves in magneto-electro-elastic (MEE) materials. The dispersion properties are analyzed through analytical determination and perturbation methods. It is found that slow-propagating quasi-shear-elastic waves dominate the low-frequency range, while fast-propagating quasi-magneto-electric waves dominate the high-frequency range. The propagation and attenuation behaviors of these waves can be controlled by varying the physical parameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Joao C. Serra, Mario G. Silveirinha
Summary: We introduce a homogenization approach to characterize the dynamical response of a generic dispersive space-time crystal in the long-wavelength limit. The theory is applied to dispersive space-time platforms with a traveling-wave modulation, and it is shown that for long wavelengths the effective response may be described by a frequency-dependent permittivity. The article discusses the peculiar physics exhibited by dispersive space-time crystals, such as anomalous permittivity dispersion, alternate gain and loss regimes, and multiple resonances in the quasistatic regime.
Letter
Optics
Yasaman Ghasempour, Yasith Amarasinghe, Chia-Yi Yeh, Edward Knightly, Daniel M. Mittleman
Summary: This paper investigates the usage of reflected non-line-of-sight (NLOS) paths for communication in directional networks at frequencies above 100 GHz. The study explores how high-gain directional antennas bring new challenges and opportunities for exploiting NLOS paths, demonstrating that NLOS paths can offer higher data rates under certain circumstances, distinguishing THz wireless systems from those operating at lower frequencies.
Article
Multidisciplinary Sciences
Maryam Khodadadi, Seyyed Mohammad Mehdi Moshiri, Najmeh Nozhat, Mohsen Khalily
Summary: In this paper, a controllable hybrid plasmonic integrated circuit (CHPIC) has been designed and investigated. The functionality of each device and the advantages over state-of-the-art have been comprehensively studied. Its importance in optical wireless communication and inter/intra-chip optical interconnects has been demonstrated.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Analytical
Rafal Mech, Przemyslaw Wiewiorski, Karol Wachtarczyk
Summary: This paper presents the results obtained using rapid demagnetization method and a new hybrid core. The results show the feasibility of the system at high frequencies.
Article
Physics, Multidisciplinary
Soroush Sepehri, Mahmoud Mosavi Mashhadi, Mir Masoud Seyyed Fakhrabadi
Summary: This study investigates the manipulation of wave motion in phononic crystals using shape memory alloys (SMAs), extending their application to nonlinear lattices. Results show that SMAs have significant effects on wave propagation through temperature-induced phase transformation and stiffness nonlinearity.
Article
Physics, Multidisciplinary
Xiang Zhang, Haozhe Li, Zhiteng Wang, Changshui Chen, Lifu Zhang
Summary: The process of dispersive waves emitted from unique Pearcey Gaussian pulses in the anomalous dispersion region of optical fiber is investigated. The asymmetry of the spectral distribution and the temporal oscillation structure of the pulses significantly improves the amplitude and energy conversion efficiency of the waves. The radiation frequency of the dispersive waves can be predicted by a modified phase matching condition.
ANNALEN DER PHYSIK
(2022)
Article
Construction & Building Technology
Wenchao He, Wallace Wai-Lok Lai, Xin Sui, Antonios Giannopoulos
Summary: Detection of delamination in asphalt pavement using non-destructive ground penetrating radar (GPR) is valuable for maintenance and repair. However, limitations in GPR survey resolution and wave interferences make it challenging to characterize thin delamination layers. This paper proposes a new method using the GPR waveguide dispersion model in a wide-angle reflection and refraction (WARR) configuration to characterize delamination layers. The approach is validated through synthetic and laboratory experiments, showing sensitivity to air-filled and water-filled delamination, enabling the detection and identification of delamination layers in asphalt pavement structures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Physics, Applied
Li-Guo Qin, Guo-Dong Yan, Jie-Hui Huang, Li-Li Wang, Hui-Ping Wang, Zhong-Yang Wang, Shang-Qing Gong
Summary: Future quantum networks will require reversible coherent conversion and modulation between microwave and optical photons to combine the quantum information-processing ability of microwaves with the long-distance distribution capability of optical photons. A scheme of bi-directional phase controllable four-wave mixing between microwave and optical fields has been presented, utilizing a nanomechanical optomechanical resonator as an intermediate interface. This hybrid optomechanical system offers potential for electro-optic modulation and a broad range of applications in optical communications and quantum networks.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Deependra Singh Gaur, Ankit Purohit, Akhilesh Kumar Mishra
Summary: We conducted a numerical investigation on the propagation dynamics of a truncated Airy pulse in a highly dispersive and nonlinear medium, focusing on the effects of fourth-order dispersion (FOD) and cubic-quintic-septic nonlinearity. Our results show that the presence of FOD can cancel the Airy pulse's self-acceleration and affect its oscillatory tail during propagation. Additionally, soliton shedding is observed at low input pulse power in the presence of cubic and quintic nonlinearity and negative FOD, with the emergent soliton exhibiting temporal shift depending on the strengths of the nonlinearities.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Liliana C. Fernandes, Daniela M. Correia, Mohammad Tariq, Jose M. S. S. Esperanca, Pedro Martins, Senentxu Lanceros-Mendez
Summary: With the increase in demand for miniaturized multifunctional devices, especially sensors and actuators, the development of smart materials with magnetoelectric (ME) properties has become important. The study demonstrates the suitability of magnetoelectric responsive materials for magnetic sensing and actuation devices. The materials show voltage responses in the mV range, making them suitable for high sensitivity magnetic field sensors.
Article
Multidisciplinary Sciences
Wenchong Ouyang, Qi Liu, Zheng Zhang, Tao Jin, Zhengwei Wu
Summary: In this study, the impact of non-ionization reaction rate on plasma generation mechanism and electromagnetic wave attenuation was numerically solved and it was found that reducing the reaction rate of NO reversible arrow N + O can significantly decrease electron number density and thus reduce electromagnetic wave attenuation.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Constantinos G. Vayenas, Dionysios Tsousis, Dimitrios Grigoriou
Summary: The neutrino mass values obtained from the Nobel Prize winning measurements were used to calculate the speed of acoustic waves in gases with neutrinos. Surprisingly, it was found that acoustic waves in the lightest neutrino environments propagate with the speed of light. Additionally, it was discovered that the rest energy of the lightest neutrinos coincides with the photon energy at the cosmic background radiation temperature.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Geochemistry & Geophysics
Lin Zhang, Jing Ba, Jose M. Carcione
Summary: The theory developed in this study describes wave propagation in porous media with inclusions at multiple scales, derived from differential effective medium theory and Biot-Rayleigh theory for double-porosity media. The theory determines generalized stiffness and density coefficients based on the first principles of strain, kinetic, and dissipation energies, showing that anelasticity depends on various factors such as inclusion size, distribution parameter, mean radius, and variance. Experimental results confirm the model's validity in describing anelasticity observed in laboratory and field measurements.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Materials Science, Multidisciplinary
Mohammed Shaaf Alharthi
Summary: In this manuscript, a new method for solving nonlinear equations is introduced and applied to the field of nonlinear wave propagation. The results are visualized through graphs to better understand the physical behavior. All the presented results are new achievements not previously mentioned in the literature. Symbolic calculations in Maple and simulations in Mathematica are used in the computational process.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Aerospace
Dominic Keidel, Urban Fasel, Paolo Ermanni
Summary: This work introduces a novel structural concept for morphing wings based on carbon-fiber reinforced polymer lattice structures, allowing tailored aeroelastic behavior and shape morphing for active flight control. The optimized lightweight lattice morphing wing achieved high load-carrying capabilities and sufficient rolling moment coefficient compared to existing morphing wings.
Article
Materials Science, Multidisciplinary
Matheus INc Rosa, Matteo Mazzotti, Massimo Ruzzene
Summary: The study focuses on exceptional points in continuous elastic media and their potential application in detecting mass and stiffness perturbations. By introducing balanced gain and loss to induce degenerate states, the sensitivity of the system is enhanced, making it promising for applications involving sensing of disturbances such as point masses and surface cracks.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Acoustics
Matteo Mazzotti, Christopher Sugino, Eetu Kohtanen, Alper Erturk, Massimo Ruzzene
Summary: The study investigates and characterizes high order Lamb wave modes in a human skull to estimate the mechanical properties of cortical and trabecular bones, using direct contact excitation and infrared laser vibrometry. The results demonstrate the use of high order Lamb waves to understand the wave properties of a human skull and estimate the mechanical properties of bones.
Article
Engineering, Aerospace
Urban Fasel, Paolo Tiso, Dominic Keidel, Paolo Ermanni
Summary: The study demonstrates that utilizing morphing wings can significantly increase the power production capability of airborne wind energy systems. The optimization framework allows concurrent aerostructural design and flight trajectory optimization, improving the energy efficiency. Therefore, adapting wing shape changes for different operating modes can further enhance power production.
Article
Engineering, Manufacturing
A. X. H. Yong, A. Aktas, D. May, A. Endruweit, S. V. Lomov, S. Advani, P. Hubert, S. G. Abaimov, D. Abliz, I. Akhatov, M. A. Ali, S. Allaoui, T. Allen, D. C. Berg, S. Bickerton, B. Caglar, P. Causse, A. Chiminelli, S. Comas-Cardona, M. Danzi, J. Dittmann, C. Dransfeld, P. Ermanni, E. Fauster, A. George, J. Gillibert, Q. Govignon, R. Graupner, V. Grishaev, A. Guilloux, M. A. Kabachi, A. Keller, K. Kind, D. Large, M. Laspalas, O. V. Lebedev, M. Lizaranzu, A. C. Long, C. Lopez, K. Masaniar, V. Michaud, P. Middendorf, P. Mitschang, S. van Oosterom, R. Schubnel, N. Sharp, P. Sousa, F. Trochu, R. Umer, J. Valette, J. H. Wang
Summary: This study conducted an international benchmark exercise on the measurement of fibre bed compaction behavior, revealing a large scatter in results among participants and the significant impact of wet conditions on the variation of results, with differences observed between two types of fabrics.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Manufacturing
M. A. Kabachi, L. Stettler, S. Arreguin, P. Ermanni
Summary: This study introduces a novel method for the simultaneous characterization of compaction and unsaturated out-of-plane permeability of engineering textiles in one single experiment. The measurement technique relies on visually tracking flow-front positions and compaction during through-thickness impregnation, providing permeability at different fiber-volume-fractions while also verifying any race-tracking that may occur during impregnation. The method is successfully validated through testing of glass fiber NCF and woven fabrics, comparing permeability and compaction results to analytical solutions and those obtained from a universal testing machine.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Physics, Multidisciplinary
Yiwei Xia, Emanuele Riva, Matheus I. N. Rosa, Gabriele Cazzulani, Alper Erturk, Francesco Braghin, Massimo Ruzzene
Summary: The experimental demonstration shows temporal pumping of elastic waves in an electromechanical waveguide, enabling the generation and control of edge states through temporal modulation of stiffness. The framework allows for controllable transfer of edge states from one boundary to the other, opening up new avenues for information manipulation and transport through elastic waves. This study also explores higher-dimensional topological physics using virtual dimensions mapped to time in electromechanical systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Instruments & Instrumentation
Oleg Testoni, Thomas Lumpe, Jian-Lin Huang, Marius Wagner, Sampada Bodkhe, Zhenishbek Zhakypov, Ralph Spolenak, Jamie Paik, Paolo Ermanni, Luis Munoz, Kristina Shea
Summary: This paper presents a proof-of-concept for a 4D printed active compliant hinge for the deployment and reorientation of satellite appendages. By utilizing thermally induced stiffness modulation and shape memory alloy actuators, the hinge can achieve multiple reorientations, leading to an increased energy generation of 54% to 72%.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Mechanics
Giada Risso, Maria Sakovsky, Paolo Ermanni
Summary: A novel manufacturing technique for moldlessly fabricating 3-dimensional FRP structures using pre-stretched membranes to drive out-of-plane buckling instabilities is presented in this work. An analytical model based on high deformation beam buckling theory is developed to understand the parameters influencing the out-of-plane behavior of these structures. Experimental and finite element results validate the model, showing excellent agreement and potential for tailoring out-of-plane deformation by varying geometric and material parameters.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Manufacturing
A. X. H. Yong, A. Aktas, D. May, A. Endruweit, S. Advani, P. Hubert, S. G. Abaimov, D. Abliz, I. Akhatov, M. A. Ali, T. Allen, D. C. Berg, S. Bickerton, C. Brauner, D. Brutsch, B. Caglar, H. Caglar, P. Causse, A. Chiminelli, A. Cohades, S. Comas-Cardona, M. Danzi, J. Dittmann, C. Dransfeld, P. Ermanni, E. Fauster, J. A. Garcia-Manrique, A. George, R. Graupner, V. Grishaev, A. Guilloux, M. Hancioglu, W. Harizi, T. Herman, W. Huang, M. A. Kabachi, A. Keller, K. Kind, M. Laspalas, O. V. Lebedev, M. Lizaranzu, A. C. Long, K. Masania, V. Michaud, P. Middendorf, D. Salvatori, R. Schubnel, N. Sharp, M. Sozer, J. Thomas, F. Trochu, R. Umer, J. Valette, J. H. Wang, B. Willenbacher
Summary: The study found that there was a significant variability in out-of-plane permeability between participants, but most values fell within a narrow range. The majority of participants used the 1D saturated test method, while a few used 1D unsaturated and 3D unsaturated flow methods with similar results. Analysis indicated that the number of layers in a specimen, fibre volume fraction, injection pressure, and sealing of specimen edges all affected the measured permeability.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Instruments & Instrumentation
Rico Weber, Samuel Seydel, Adriaan B. Spierings, Andrea Bergamini, Bart Van Damme, Konrad Wegener
Summary: Laser-based powder bed fusion of metals is a commonly used additive manufacturing process for fabricating complex metal parts. However, these parts are vulnerable to high amplitude resonant vibrations. This study presents techniques for integrating piezoelectric materials into additive manufactured parts and tracking the stress state during the integration process.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Giada Risso, Paolo Ermanni
Summary: Shape adaptable structures are highly desired in various fields, and a new class of multi-stable composite structures has been investigated. By arranging polygonal frames, the structures can achieve multiple stable states and large shape transformations. This study proves the flexibility of the design and opens up new possibilities for the applications of multi-stable composite structures.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
M. Mazzotti, A. Foehr, O. R. Bilal, A. Bergamini, F. Bosia, C. Daraio, N. M. Pugno, M. Miniaci
Summary: Hierarchy provides unique opportunities for advanced material design with superior properties. However, its role in vibration mitigation and wave manipulation remains unclear. In this study, we demonstrate that designing non self-similar hierarchical geometries enables the creation of periodic structures supporting multiple highly attenuative and broadband bandgaps at different frequencies. The type of band gap mechanism is identified by examining the vibrational mode shapes and dispersion diagram of the unit cell.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Aghna Mukherjee, Giada Risso, Paolo Ermanni
Summary: In recent years, there has been extensive research on using multi-stable components for designing adaptive structures and energy harvesting systems. However, there is limited work on quantifying the strength of stable equilibrium shapes. This study presents a mathematical framework that quantifies the strength of stability and identifies the minimum energy path between stable states. The method provides a quantitative measure of stability and simplifies the design of efficient actuation strategies.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Domenico Tallarico, Andrea Bergamini, Bart Van Damme
Summary: In this article, the scattering and localization phenomena in a thin elastic plate with an aperiodic arrangement of scatterers are discussed. The form factor of the scattering cluster is analyzed to sample the reciprocal space, which reveals strong scattering points associated with nontrivial dynamic response. Attenuating frequency regimes and bands with strong localization are identified and experimentally observed. It is shown that both localization and attenuation are induced by long-range aperiodic patterns, which is confirmed through analytical estimates, numerical predictions, and experiments.
