Article
Multidisciplinary Sciences
Lianchao Wang, Julio A. Iglesias Martinez, Gwenn Ulliac, Bing Wang, Vincent Laude, Muamer Kadic
Summary: In this paper, a model for non-reciprocal and non-Newtonian mechanical metamaterials is demonstrated by combining the concept of local resonances and fixing boundaries. Via computational models and impact experiments, the authors show that stiffness substantially changes as a function of the loading velocity.
NATURE COMMUNICATIONS
(2023)
Article
Acoustics
H. Zhou, A. Baz
Summary: This paper introduces a class of active non-reciprocal metamaterials aimed at controlling the flow of acoustic waves in a one-dimensional acoustic duct. The method focuses on adjusting eigenvectors to enable spatial control and redistribution of wave propagation for desired non-reciprocal behavior. An experimental validation demonstrates basic features, non-reciprocal behavior, and control characteristics of the proposed approach.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Huu Nguyen Bui, Thanh Son Pham, Jong-Wook Lee
Summary: This work presents a time-varying, non-reciprocal, reconfigurable metasurface and demonstrates its active switching control on subwavelength waveguides operating at 13 MHz and 13.5 MHz. The dynamic reconfiguring capability offers versatile practical applications, overcoming the limitations of static passive metamaterials.
RESULTS IN PHYSICS
(2021)
Article
Mechanics
Mingkai Zhang, Jinkyu Yang, Rui Zhu
Summary: This research combines origami units with vibration-filtering metastructures using bistable origami structures as resonant unit cells. The adjustable stiffness of the metastructure's resonant unit is achieved through the geometric nonlinearity of the origami building block, with experiments conducted to verify its tunable vibration isolation abilities. Additionally, a two-dimensional plate-like metastructure is designed for controlling different vibration modes.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2021)
Article
Nanoscience & Nanotechnology
Saeed Osat, Ramin Golestanian
Summary: A hallmark of living systems is the ability to self-organize building blocks into different structures. Non-equilibrium dynamics, specifically programmable non-reciprocal interactions, play a crucial role in achieving automated control of such self-assembled structures and transitions between them.
NATURE NANOTECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Haidi Yang, Li-Yun Fu, Tobias M. Mueller, Bo-Ye Fu
Summary: Seismic exploration of deep oil/gas reservoirs requires considering wave propagation in high-pressure media, as well as nonlinear strain responses due to finite stresses. Decoupling the elastic waves from high-pressure deep formations is crucial for further development in prospecting technology. This study presents a decoupling method using acoustoelasticity equations and a finite-difference method, demonstrating the significant impact of prestressed conditions on seismic responses.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Physics, Applied
Danilo Braghini, Luis G. G. Villani, Matheus I. N. Rosa, Jose R. de F. Arruda
Summary: This work investigates non-Hermitian elastic waveguides with periodically applied proportional feedback efforts, showing non-reciprocal frequency components in dispersion diagrams and the effects of feedback sign and locality on wave propagation. The results contribute to designing metamaterials with novel properties and potential technological applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Optics
Sebastian Pucher, Christian Liedl, Shuwei Jin, Arno Rauschenbeutel, Philipp Schneeweiss
Summary: Researchers demonstrate non-reciprocal amplification of nanofibre-guided light using Raman gain provided by nearby spin-polarized atoms. The direction of amplification can be controlled via the atomic spin state.
Article
Engineering, Multidisciplinary
Danilo Karlicic, Milan Cajic, Stepa Paunovic, Aleksandar Obradovic, Sondipon Adhikari, Johan Christensen
Summary: Non-reciprocal wave propagation has attracted much attention in recent years, and researchers have explored breaking reciprocity using space-and/or time-dependent constitutive material properties to overcome the limitations of conventional mechanical lattices. This study investigates non-reciprocity in elastic locally resonant and phononic-like one-dimensional lattices with time-modulated mass and stiffness properties. The frequency-band structures and asymmetric band gaps are determined for each configuration, and the technique is extended to study more complex two-dimensional lattices.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Optics
D. A. Roman-Garcia, F. H. Maldonado-Villamizar, B. Jaramillo-Avila, B. M. Rodriguez-Lara
Summary: We demonstrate the scattering control of Gaussian-like wave packets with constant envelope velocity and invariant waist using coupled resonator optical waveguides (CROW) and an external resonator. The analytical and approximate results are in good agreement with numerical simulations. Various configurations, including light trapping, wave packet splitting, and non-local Mach-Zehnder interferometer, are engineered using an external resonator coupled to a CROW.
Article
Engineering, Multidisciplinary
Ugur Cem Hasar, Hamdullah Ozturk, Huseyin Korkmaz, Mehmet Akif Ozkaya, Omar Mustafa Ramahi
Summary: A novel line-line (LL) method is proposed to determine the forward and backward propagation constants and wave impedances of non-reciprocal networks/lines. It utilizes a reference network/line with arbitrary propagation constant, impedance, and length for this purpose. The method's effectiveness is examined through a theoretical analysis and validated through measurements of a microwave phase shifter.
Article
Mechanics
Sina Massoumi, Somaye Jamali Shakhlavi, Noel Challamel, Jean Lerbet
Summary: Non-symmetrical elastic interactions can induce flutter instabilities in one-dimensional lattices. This paper presents an exact solution for the vibration of such lattices with non-symmetrical elastic interactions and predicts the possibility of divergence and flutter instabilities.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Physics, Multidisciplinary
Huagen Yang, Kan Feng, Rong Li, Jing Yan
Summary: As a new type of elastic material, elastic wave metasurface has great significance in the research field of elastic wave regulation. However, most of the existing research on elastic wave metasurface is guided by traditional Generalized Snell's Law (GSL) and does not consider the effects of higher order diffraction waves caused by structural periodicity. This paper designs a helical metasurface based on the elastic wave theory of plate-beam structure to explain the complex transmission phenomenon of elastic wave metasurfaces. The results show that the structure has great potential in applications such as ultrasonic detection.
FRONTIERS IN PHYSICS
(2022)
Article
Polymer Science
Charlie Maslen, Azarmidokht Gholamipour-Shirazi, Matthew D. Butler, Jindrich Kropacek, Ivan Rehor, Thomas Montenegro-Johnson
Summary: A new paradigm for achieving anisotropic dynamics in a microscale actuator made of a single material is demonstrated. By incorporating micro-sized pores into certain segments of the structures, the rate of shrinking/swelling in the structure is locally modulated, generating global anisotropic, non-reciprocal dynamics. This design has the potential to be used as a foundational tool for inducing non-reciprocal actuation cycles with a single material structure, enabling new possibilities in producing customized soft actuators and modular anisotropic metamaterials for a range of real-world applications.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Paulina Obara, Justyna Tomasik
Summary: The paper conducts a parametric analysis of tensegrity structures under time-independent external loads. A complete dynamic stability analysis consists of three steps, focusing on identifying self-stress states, infinitesimal mechanisms, and examining static and dynamic behavior under time-independent external loads. This paper covers the first two stages and analyzes the impact of initial prestress on static parameters and frequency using a geometrically non-linear model.
Article
Automation & Control Systems
Benjamin L. Leon, Julian J. Rimoli, Claudio Di Leo
Summary: Closed-loop feedback control articulating landing gear, also known as robotic landing gear (RLG), have been proven to increase rotorcraft landing capabilities on sloped and rough terrain. However, modern RLG systems have limitations for landing on dynamic platforms due to a lack of fuselage roll and roll rate feedback. This study presents a cable-driven RLG system for the S-100 Camcopter which expands landing zone limits and enables dynamic platform landings in rough sea state conditions. An innovative roll and foot-force feedback fused control algorithm is developed for ship deck landings without the need for advanced vision-based landing systems.
JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME
(2021)
Article
Instruments & Instrumentation
Kaijun Yi, Zhiyuan Liu, Rui Zhu
Summary: This paper proposes a general method to design multi-resonant piezoelectric metamaterials and explains the mechanism of generating multiple bandgaps by analytically studying the effective bending stiffness of the metamaterial plate. The characteristics of these bandgaps are investigated, and the isolation effects of vibration transmission in the metamaterials at multiple line frequencies or within a broad frequency band are numerically verified in frequency domain. Time domain simulations are also performed to demonstrate the stability and functionality of the metamaterials.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Mathematics, Applied
Aarohi Shah, Julian J. Rimoli
Summary: A new framework is introduced to develop data-driven dimensionally-reduced surrogate models at the component level, termed smart parts (SPs), to establish a direct relationship between input-output parameters of components. This approach utilizes advanced machine learning techniques to preserve all information related to history and nonlinearities, allowing for straightforward application to a diverse set of engineering problems without imposing restrictions on analysis types. Results show that SPs significantly reduce computational cost while maintaining accuracy, enabling analysis of complex assemblies in the nonlinear regime.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Christine A. Gebara, Paul D. Lytal, Julian J. Rimoli
Summary: In the past decade, the use of complex deployable structures on CubeSats and large-scale spacecraft has become increasingly common. Traditional manufacturing challenges have led to advancements in metal additive manufacturing technology, opening up new possibilities for aerospace hardware.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Physics, Multidisciplinary
Danjie Yin, Kaijun Yi, Zhiyuan Liu, Anfu Zhang, Rui Zhu
Summary: This study proposes a novel cylindrical meta-shell with piezoelectric materials and digital circuits to control the low-frequency vibration of cylindrical shells. By optimizing the parameters in the transfer function, the meta-shell can significantly reduce the peak amplitudes of the first five modes, offering new opportunities for vibration mitigation of transport vehicles and underwater equipment.
FRONTIERS IN PHYSICS
(2022)
Article
Engineering, Multidisciplinary
Aarohi Shah, Julian J. Rimoli
Summary: This study proposes a method that utilizes machine learning techniques to develop a surrogate model and homogenize heterogeneous structures, aiming to improve computational efficiency and simplify analysis. The approach, which expands the operational frequency spectrum and improves prediction resolution, is not limited to specific material types or heterogeneities.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Aerospace
Hernan J. Logarzo, Julian J. Rimoli
Summary: Understanding the behavior of materials exposed to plasma is crucial for the design of electric propulsion devices. A plasma-material interaction model is introduced in this study to capture the evolution of surface features at the macroscopic scale on materials exposed to plasma over a long period of time. The results show that the model is able to reproduce both the mean erosion rate and the macroscopic anomalous ridges that appear after long exposure, highlighting the importance of considering complex thermomechanical material behavior.
JOURNAL OF PROPULSION AND POWER
(2023)
Article
Physics, Applied
Han Wang, Julian J. Rimoli, Penghui Cao
Summary: By using atomistic simulations, we investigated a range of nanotwinned materials with different stacking fault energies (SFEs) to understand the limit of twin boundary (TB) strengthening. In contrast to Cu and Al, nanotwinned materials with ultra-low SFEs (Co, NiCoCr, and NiCoCrFeMn) exhibited continuous strengthening down to a twin thickness of 0.63 nm. Our study revealed that even at the nanometer scale, hard dislocation modes persisted while the soft dislocation mode, which caused detwinning in Cu and Al, resulted in phase transformation and lamellar structure formation in Co, NiCoCr, and NiCoCrFeMn. This enhanced understanding of dislocation mechanisms in nanotwinned materials showcases the potential for controlling mechanical behavior and ultimate strength through tunable composition and SFE, particularly in multi-principal element alloys.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Acoustics
Mingfei Wang, Kaijun Yi, Rui Zhu
Summary: This research studies the tunable underwater low-frequency sound absorption of locally resonant piezoelectric metamaterials (LRPM). A theoretical model is established to analyze the tunable sound absorption characteristics and perfect absorption mechanism from the perspective of effective materials. The theoretical results are in good agreement with the numerical ones. The research shows that a thin LRPM layer can achieve perfect sound absorption at targeted low-frequency, which can be actively tuned by manipulating the resonant shunt circuit. Furthermore, introducing negative capacitance (NC) shunt significantly improves the sound absorption bandwidth. The study also discusses the causal constraints and its improvement by NC shunt, providing guidance for efficient and widely adjustable ultra-thin underwater sound absorbers.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Multidisciplinary Sciences
Qian Wu, Xianchen Xu, Honghua Qian, Shaoyun Wang, Rui Zhu, Zheng Yan, Hongbin Ma, Yangyang Chen, Guoliang Huang
Summary: A class of active metamaterial with odd mass density tensor is presented, where the asymmetric part of the density arises from active and nonconservative forces. The odd mass density is realized using metamaterials with inner resonators connected by asymmetric and programmable control. Experimental validation shows that the odd mass in active solids leads to wave anisotropy and directional wave energy gain.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Zhou Hu, Zhibo Wei, Kun Wang, Yan Chen, Rui Zhu, Guoliang Huang, Gengkai Hu
Summary: In the field of flexible metamaterial design, harnessing zero modes is crucial for reconfigurable elastic properties. However, lacking systematic designs on the corresponding zero modes leads to quantitative enhancement rather than qualitative transformation of the metamaterials. Here, the authors propose a 3D metamaterial with engineered zero modes and demonstrate its transformable static and dynamic properties, covering seven extremal metamaterial types.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Zhibo Wei, Zhou Hu, Rui Zhu, Yan Chen, Gengkai Hu
Summary: This paper proposes a novel design for a three-dimensional pentamode metamaterial, which can exhibit both anisotropic and isotropic properties by changing its geometry. Experimental results demonstrate that this pentamode metamaterial can manipulate the amplitude and wavefront of acoustic waves, providing a wider platform for tunable control of acoustic waves in fluids.
MATERIALS & DESIGN
(2023)
Article
Multidisciplinary Sciences
Shaoyun Wang, Zhou Hu, Qian Wu, Hui Chen, Emil Prodan, Rui Zhu, Guoliang Huang
Summary: Topological pumping allows undisturbed navigation of waves in a sample. We show this phenomenon using elastic surface waves by strategically patterning the surface to create a synthetic dimension. Arrays of resonating pillars connected by slow-varying coupling bridges support eigenmodes below the sound cone. By developing a tight-binding model and a WKB analysis, we establish a connection between the dynamics of the pillars and that of electrons in a magnetic field, enabling us to predict the topological pumping pattern.
Proceedings Paper
Engineering, Aerospace
Kevin Garanger, Matthew Krajewski, Isaac del Valle, Utkarsh Raheja, Julian J. Rimoli, Miriam Rath, Marco Pavone
Summary: Tensegrity systems have the potential for planetary landing and exploration applications, with the ability to store and utilize energy, while achieving efficient structural design through the buckling of compression members.
EARTH AND SPACE 2021: SPACE EXPLORATION, UTILIZATION, ENGINEERING, AND CONSTRUCTION IN EXTREME ENVIRONMENTS
(2021)
Article
Engineering, Aerospace
Nathan P. Brown, Collin B. Whittaker, Julian J. Rimoli, W. Jud Ready, Mitchell L. R. Walker
Summary: This study quantified the formation and growth of microcracks on the surface of M26 grade boron nitride composite due to thermal shock, and evaluated their impact on plasma erosion. The results showed that the ratio of crack area to total area increased with thermal cycling, but microcracks did not significantly affect surface composition or feature development.
JOURNAL OF PROPULSION AND POWER
(2021)
