Article
Construction & Building Technology
Lei Gao, Chenzhi Cai, Cheuk Ming Mak, Xuhui He, Yunfeng Zou, Dizi Wu
Summary: This study proposes two types of periodic hollow steel trenches that can simultaneously exhibit Bragg band gaps and local resonance band gaps, aiming to attenuate surface waves induced by ambient vibration and seismic vibration. The effectiveness of these trenches in vibration isolation is demonstrated through numerical calculations and analysis.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Physics, Multidisciplinary
Geon Lee, Dongwoo Lee, Jeonghoon Park, Yeongtae Jang, Miso Kim, Junsuk Rho
Summary: Mechanical metamaterials and phononic crystals can localize, focus, and guide elastic or acoustic waves in various ways. These man-made structures allow for more efficient collection of energy and have a wide range of potential applications in renewable energy transformation.
COMMUNICATIONS PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Soo-Ho Jo, Heonjun Yoon, Yong Chang Shin, Wonjae Choi, Byeng D. Youn, Miso Kim
Summary: This study proposes an L-shaped arrangement of triple defects in a phononic crystal for broadband piezoelectric energy harvesting. The design effectively confines and harvests elastic-wave energy over a wide range of frequencies, overcoming the limitations of single and double defect designs.
Article
Automation & Control Systems
Ge Shi, Yinshui Xia, Yanmei Yang, Junfu Chen, Yansheng Peng, Huakang Xia, Xiudeng Wang, Libo Qian
Summary: This article introduces a broadband piezoelectric vibration energy harvesting system that actively adjusts its resonant frequency using a microstepper to regulate the position of the mass. It also presents a new method for online dynamic detection of the piezoelectric transducer's vibration status without additional sensors. Experimental results show that the system can efficiently self-power in a wide range of ambient vibration frequencies.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Marine
Huan-Wen Liu
Summary: Based on the band theory of Bloch waves, an approximate law is established to locate the phase of Class I Bragg resonance when linear shallow-water waves are reflected by a finite periodic array of widely spaced artificial bars. The law is described by a function of several parameters such as bar shape, dimensionless bar height, and dimensionless bar width. It is found that Bragg's law does not apply to Bragg resonances of linear shallow-water waves excited by any finite periodic array of widely spaced bars. The phenomenon of phase downshifting can be explained and predicted accurately based on the approximate law, which becomes more significant with increasing cross-sectional area of artificial bars.
Article
Chemistry, Physical
Tianrun Li, Zhemin Wang, Hanjie Xiao, Zhimiao Yan, Cheng Yang, Ting Tan
Summary: This study introduces a Helmholtz acoustic metamaterial (HAM) piezoelectric device with dual-band acoustic energy harvesting characteristics, which amplifies both structural and local resonances for improved energy conversion efficiency. Numerical simulations and experimental results demonstrate that the energy conversion efficiency of HAM is significantly higher than that of traditional acoustic metamaterials in both structural and local resonance bands.
Article
Energy & Fuels
Hyo-Kyung Shim, Shuailing Sun, Hyun-Soo Kim, Dong-Gyu Lee, Yeon-Jeong Lee, Ji-Soo Jang, Kyung-Hoon Cho, Jeong Min Baik, Chong-Yun Kang, Yonggang Leng, Sunghoon Hur, Hyun-Cheol Song
Summary: A nonlinear piezoelectric energy harvester with a coupled beam array is designed to broaden bandwidth and improve energy harvesting performance. Experimental results show that the harvester outperforms traditional non-coupled multi-resonance harvester, with 144.2% higher output power and a 93.3% wider bandwidth in a certain frequency range. The harvester can be used in unstable or varying conditions.
Article
Engineering, Mechanical
Yong Chang Shin, Heonjun Yoon, Soo-Ho Jo, Wonjae Choi, Choon-Su Park, Miso Kim, Byeng D. Youn
Summary: This study introduces a quarter-wave stack (QWS)-based piezoelectric energy harvesting (PEH) system for elastic waves, aiming to manipulate the standing wave pattern and optimize the placement of the piezoelectric layer to generate maximum output power. Analysis results show that increasing the number of unit cells enhances PEH performance, while the standing wave pattern and electroelastic coupling vary with excitation frequency. These findings offer guidelines for designing parameters to maximize the performance of QWS-based PEH systems under elastic waves for various applications.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Energy & Fuels
Sallam A. Kouritem, Muath A. Bani-Hani, Mohamed Beshir, Mohamed M. Y. B. Elshabasy, Wael A. Altabey
Summary: This paper investigates a new energy harvesting device that utilizes Automatic Resonance Tuning (ART) technique to enhance energy harvesting mechanism. The research reveals that the bandwidth of the ART harvester is increased by 1130% compared to the fixed resonance energy harvester. The proposed broadband design provides a high-power density for energy harvesting.
Article
Physics, Condensed Matter
E. J. P. Miranda Jr, J. M. C. Dos Santos
Summary: The study reports on the wave attenuation of elastic Bloch waves in 1-3 piezoelectric phononic structures with BaTiO3 inclusions in a polymeric matrix, showing the observation of complete Bragg-type band gaps that improve band gap width and wave attenuation. This design can be used for surface acoustic wave filters and piezocomposite transducer design.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Engineering, Mechanical
M. Aravindan, S. Faruque Ali
Summary: Recent literature suggests that spectral characteristics of a harvester can be enhanced by invoking internal resonance between modes. This study analyzes the nonlinear dynamics and harvesting performance of a 1:3 internally resonant piezoelectric cantilever beam with a lumped mass under harmonic excitation. The results show that the higher mode invoked through internal resonance plays a significant role in broadband power generation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Long Zhao, Ze-Qi Lu, Hu Ding, Li-Qun Chen
Summary: This study proposes an approach to explore the band energy structures of elastic metamaterials using the Hamilton principle, Bloch theorem, and finite-element method. Experimental verification on ultralow frequency metamaterials with nonlinear resonators confirms the broadband isolation of longitudinal and transverse waves.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Analytical
Siyang Hu, Ulrike Fitzer, Khai Chau Nguyen, Dennis Hohlfeld, Jan G. Korvink, Tamara Bechtold
Summary: In recent years, topology optimization has been proven to be the cutting-edge technology in mechanical structure design, while energy harvesting has gained significant attention in both research and industry. This work presents a novel topology optimization approach for a multi-resonant piezoelectric energy-harvester device, aiming to develop a broadband design that can generate constant power output over a range of frequencies, ensuring reliable operation under changing environmental conditions. The optimization results suggest a promising design with satisfactory frequency characteristics.
Article
Engineering, Electrical & Electronic
Bao Zhao, Jiacong Qiu, Junrui Liang
Summary: This paper presents an impedance-based analysis and comparison of electromechanical joint dynamics in piezoelectric energy harvesting (PEH) systems employing various interface circuits. The study reveals that the achievable dynamic ranges of practical interface circuits are subsets of the ideal arbitrarily tunable scenario. The research findings provide insights for future design efforts towards high-capability and broadband PEH systems.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Crystallography
Soo-Ho Jo, Byeng D. Youn
Summary: This study introduces a novel design concept for phononic crystals, examining differently configured double defects to achieve broadband elastic wave energy localization and harvesting.
Article
Physics, Applied
Gorkem Okudan, Hrishikesh Danawe, Didem Ozevin, Serife Tol
Summary: This paper presents the research on torsional wave focusing in cylindrical structures integrated with conformal gradient-index phononic crystal (GRIN-PC) lenses. The main goal is to exploit the GRIN-PC concept for amplification of the fundamental torsional wave mode, T(0,1), especially for guided wave ultrasonic testing of pipelines. Measurements show that the amplitude of the torsional wave mode is amplified by 39% at the focal point with the presence of the GRIN-PC lens.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Gorkem Okudan, Hrishikesh Danawe, Lu Zhang, Didem Ozevin, Serife Tol
Summary: Phononic crystals can manipulate elastic wave propagation in solids and improve the detection of active defects in pipe-like structures by using gradient-index (GRIN) phononic crystal lenses. The GRIN lens design successfully enhances the amplitude of localized sources, leading to a significant increase in the signal amplitude for crack growth and leak simulations in experiments. This study demonstrates the potential of using GRIN lenses to enhance passive sensing of defects in pipe geometries.
Article
Multidisciplinary Sciences
H. Al Ba'ba'a, X. Zhu, Q. Wang
Summary: This study introduces a class of architected inertial metamaterials (AIMs) to address the inherent inability of mechanical topological systems to exhibit negative elastic or inertial couplings. The potential of AIMs is demonstrated through three examples, showing their ability to design mechanical lattices with novel topological and dispersion traits.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Physics, Applied
Hasan Al Ba'ba'a, Zhenkun Lin, Serife Tol
Summary: This study reports a novel electromechanical metamaterial called SEMM, which utilizes its electromechanical resonant effects to achieve enhanced and tunable damping properties. The scissor-like structure in SEMM amplifies the damping ratio through a displacement amplification mechanism, improving vibration mitigation. By quantifying the relative dissipation performance based on complex band structures, SEMM demonstrates higher damping performance compared to traditional systems through numerical verification and analysis. The electromechanical nature of piezoelectric material in SEMM allows for convenient tuning of the damping properties by adjusting the piezoelectric shunting circuit.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Acoustics
Hrishikesh Danawe, Serife Tol
Summary: In this paper, negative refraction of flexural waves in phononic crystal (PC) plates was demonstrated for designing flat elastic lenses. A thickness contrast-based plate design was proposed to achieve refractive index equal to-1 at the interface of the PC and host plate, allowing for wave number matching in the all angle negative refraction (AANR) frequency regime. The PC-lens design was verified to achieve subwavelength imaging of an omnidirectional excitation source by tuning the thickness contrast between the plate and PC.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Chemistry, Multidisciplinary
Kyung Hoon Lee, Hasan Al Ba'ba'a, Kunhao Yu, Ketian Li, Yanchu Zhang, Haixu Du, Sami F. Masri, Qiming Wang
Summary: This study presents a magnetoactive acoustic topological transistor that can switch on and off topological states and reconfigure topological edges using external magnetic fields. By tuning the air-cavity volumes within acoustic chambers and utilizing a non-topological band gap, the switching of topological transport and the construction of topological field-effect waveguides and wave regulators are demonstrated.
Article
Physics, Applied
Zhenkun Lin, Yuning Zhang, K. W. Wang, Serife Tol
Summary: This study presents a concept of nonlinear acoustic metasurface that utilizes the nonlinearity of locally resonant unit cells for wavefront control. Through numerical and experimental validation, the study explores nonlinear phenomena such as wave steering, wave focusing, and self-bending propagation. The proposed nonlinear metasurface effectively achieves significant second-harmonic generation and separation for wavefront control of acoustic waves, offering advanced technologies for manipulating acoustic waves.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Hrishikesh Danawe, Heqiu Li, Kai Sun, Serife Tol
Summary: This Letter presents a novel self-dual kagome lattice that exhibits peculiar finite-frequency topological modes under certain conditions. These modes resemble both the zero energy modes in Maxwell lattices and the finite energy in-gap modes in topological insulators, and hold great significance for technological advances in wave phenomena.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Hasan B. B. Al Ba'ba'a, Carson L. Willey, Vincent W. W. Chen, Abigail T. Juhl, Mostafa Nouh
Summary: This paper investigates the vibrational spectrum of finite phononic crystals in the form of one-dimensional rods and explains the factors that contribute to the origination of truncation resonances. By identifying a unit cell symmetry parameter, a family of finite phononic rods is defined. A transfer matrix method is utilized to derive closed-form expressions of the characteristic equations governing the natural frequencies and decipher the truncation resonances. This study establishes concrete connections between the localized vibrations, boundary conditions, and the configuration of the truncated chain, providing tools for predicting, tuning, and selectively designing truncation resonances.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Physics, Applied
Z. Lin, S. Tol
Summary: In this paper, a tunable phase-modulated metasurface composed of piezoelectric patches with resonant-type shunt circuits is designed. The metasurface can control the wavefront of Lamb waves in a small footprint due to its subwavelength features. By tuning the electric loads in the shunt circuits, the metasurface can accomplish wave deflection and wave focusing at different angles and focal points, respectively. Moreover, with multi-resonant shunts, the metasurface can achieve anomalous wave control over flexural waves at multiple frequencies.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Acoustics
Hasan B. Al Ba'ba'a
Summary: The definition of Brillouin zone (BZ) in a class of non-reciprocal Willis monatomic lattices (WMLs) is quantitatively analyzed. It is found that BZ boundaries only shift in response to non-reciprocity in one-dimensional WMLs, resulting in a constant BZ width. The dispersion diagrams exhibit unequal wavenumber ranges for forward and backward going waves. A similar phenomenon is observed in square WMLs, where shifted and irregularly shaped BZs emerge while maintaining constant areas regardless of non-reciprocity strength.
JASA EXPRESS LETTERS
(2023)
Article
Acoustics
Hasan B. Al Ba'ba'a, Kyung Hoon Lee, Qiming Wang
Summary: This article demonstrates the potential of using electroacoustic analogies to design topological acoustic lattices and compares it with the full three-dimensional model. The established analytical framework is of great importance for designing acoustic topological insulators with minimal computational cost.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2023)
Article
Materials Science, Multidisciplinary
Hrishikesh Danawe, Heqiu Li, Hasan Al Ba'ba'a, Serife Tol
Summary: This research investigates the emergence of special corner modes in elastic twisted kagome lattices, which are localized at specific corners independent of the overall shape. The existence of these modes is attributed to charge accumulation at the boundary, confirmed by the charge distribution plot in a finite lattice.