Article
Chemistry, Analytical
Antiopi-Malvina Stamatellou, Anestis Kalfas
Summary: A nonlinear piezoelectric energy harvester was tested with different combinations of aerodynamic and harmonic base excitation to study power output and efficiency, showing that efficiency is related to excitation frequency and phase difference between excitation and response.
Article
Chemistry, Multidisciplinary
Yasmin Mohamed Yousry, Voon-Kean Wong, Rong Ji, Yunjie Chen, Shuting Chen, Xiuying Zhang, David Boon Kiang Lim, Lei Shen, Kui Yao
Summary: In this study, conformable shear mode ultrasonic transducers made of flexible piezoelectric PLLA fibers were designed and evaluated for underwater structural health monitoring applications. The transducers exhibited consistent sensitivity in detecting defects in both liquid and air. The shear mode in PLLA fibers, which originates from the crystal structure, does not require electrical poling and is resistant to aging.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Majid Khazaee, Alireza Rezania, Lasse Rosendahl
Summary: Within the Vibration Piezoelectric Energy Harvesting (VPEH) framework, this paper investigates and designs an optimal piezoelectric harvester (PH) under stochastic real-time vibrations. The study analyzes the trapezoid non-uniform piezoelectric resonator using a stochastic-excitation high-order-shear-deformation finite element (FE) method. The significance of the contact layer and proper viscous-structural combined damping model is reported. A fast and effective model-updating method for structural modulation is developed, and parametric studies are conducted to investigate the optimum load-frequency and natural frequency-geometrical parameters relationships.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Engineering, Electrical & Electronic
Sha Wang, Junjie Shan, Hua Tian, Shuyu Lin
Summary: This article develops a high-power piezoelectric transformer based on sandwiched piezoelectric transducers with multioutput characteristics. The accuracy of the electromechanical equivalent circuit model (EECM) is verified by finite element method and experiments. The output power of the sandwiched piezoelectric transformers can reach at least 45 W and maintain an efficiency of approximately 35% under high-input electric power.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Phonexai Yingyong, Panu Thainiramit, Subhawat Jayasvasti, Nicharas Thanach-Issarasak, Don Isarakorn
Summary: This study found that pedestrian body weight and pace have a strong impact on the energy harvested by a piezoelectric energy harvesting floor tile, while pedestrian density has a weaker effect. These findings are directly useful for researchers and developers in formulating a realistic harvested energy specification for their developed EHFT.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Thermodynamics
Xudong Wang, Qi Wang, Wei Wang, Yongjie Cui, Yuling Song
Summary: A novel piezoelectric-mechanical electromagnetic compound vibration energy harvester (P-MECVEH) was proposed to address the energy waste issue during the electric tractor's travel on rugged ground.
Article
Instruments & Instrumentation
Shaik Sadikbasha, B. Radhika, V Pandurangan
Summary: This work presents an auxetic hexachiral cantilever substrate for low-frequency vibration energy harvesting applications. The proposed harvester demonstrates high voltage and power output, making it suitable for low-frequency applications.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Physics, Applied
Lanbin Zhang, Yixiang He, Bo Meng, Huliang Dai, Abdessattar Abdelkefi, Lin Wang
Summary: A novel energy harvester is proposed to efficiently gather wind energy from all horizontal directions by utilizing vortex-induced vibration of the sphere and piezoelectric effect. Experimental studies show that the harvester has excellent consistency in both lock-in region and average power for various wind azimuths. The effects of supporting spring length and sphere diameter on the power output and lock-in region are also investigated.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Computer Science, Information Systems
Michail E. Kiziroglou, Steven W. Wright, Eric M. Yeatman
Summary: This paper presents a power supply that collects, stores, and delivers regulated power from the stray magnetic field of current-carrying structures, along with the design and circuit principles involved. This method may enable power autonomy to wireless sensors deployed in current-carrying infrastructure.
IEEE INTERNET OF THINGS JOURNAL
(2022)
Article
Engineering, Mechanical
Donglin Zou, Keyu Chen, Zhushi Rao, Junyi Cao, Wei-Hsin Liao
Summary: This study develops a novel quad-stable energy harvester (QEH) with user-defined equilibrium point coordinates. By programming these coordinates, high-performance QEHs can be developed and personalized for different vibration environments. The designed QEH shows high average output power, normalized power density, and operating frequency range.
NONLINEAR DYNAMICS
(2022)
Article
Nanoscience & Nanotechnology
Yajing Liu, Chao Yun, Yu Wang, Longjie Xu, Chongqi Wang, Zhongxu Li, Miao Meng, Sijia Song, Kaifeng Li, Dong Li, Feng Chen, Yang Liu, Yanda Ji, Tiangui You, Shuai Ning, Lei Qiu, Hao Yang, Weiwei Li
Summary: This study demonstrates the fabrication of a flexible and lightweight Pb(Zr0.53Ti0.47)O-3 piezoelectric film sensor via vdW heteroepitaxy. It exhibits stable damage monitoring sensitivity under harsh conditions of radiation, high temperature, and mechanical fatigue.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Mechanical
Mengjie Shang, Weiyang Qin, Haitao Li, Qi Liu, Han Wang
Summary: In this study, we proposed a novel energy harvester with characteristics of super-harmonic and subharmonic vibrations, which can significantly extend the working frequency bandwidth and maintain a large electric output for broadband excitation. Theoretical models and simulations were established and validated with experiments, showing the presence of super-harmonic and sub-harmonic vibrations. The experiments also demonstrated a transition from synchronization vibration to sub-harmonic resonance, resulting in a dramatic increase in amplitude and output. Additionally, the harvester showed a large electric output under weak stochastic excitations, with an output power of 21.2 μW for PSD = 0.07 g2/Hz.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Civil
Yupei Jian, Guobiao Hu, Lihua Tang, Wei Tang, Moein Abdi, Kean C. Aw
Summary: This paper investigates the potential of a piezoelectric metamaterial beam with a spatial grading pattern for broadband vibration attenuation through analytical and experimental methods. The results show that the bandwidth of the vibration attenuation zone can be significantly broadened and multiple resonant peaks can be attenuated by the spatial variation of the piezoelectric transducers. The experimental tests confirm the broadband vibration attenuation performance of the graded piezoelectric metamaterial.
ENGINEERING STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Bangyan Duan, Kefan Wu, Xiaoyang Chen, Jinyan Ni, Xin Ma, Weishuai Meng, Kwok-ho Lam, Ping Yu
Summary: With the rapid development of micro-energy harvesting technology, noise has great potential as a new type of micro-energy source, and a bioinspired PVDF piezoelectric generator offers a lightweight, compact, simple, and low-cost solution to harvest multi-frequency sound energy. This generator demonstrates high acoustoelectric conversion performance without the need for a sound-pressure amplifier, making it suitable for self-powered acoustic sensors.
ADVANCED ELECTRONIC MATERIALS
(2023)
Review
Thermodynamics
Saurav Sharma, Raj Kiran, Puneet Azad, Rahul Vaish
Summary: Piezoelectric energy harvesting is an important technology in powering engineering devices, and it can also be used as a clean energy source. This article provides a comprehensive review of the technologies and methodologies used in piezoelectric energy harvesting tiles, including discussions on designs, mechanisms, and electrical circuits. Feasibility aspects from economic and energy perspectives are critically presented, along with challenges and possible solutions for implementing piezoelectric tiles.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Hua Yang, Dmitry Timofeev, Ivan Giorgio, Wolfgang H. Muller
Summary: In this paper, a strain gradient continuum model for a metamaterial is proposed and its effects are investigated through numerical analysis. The study shows that the proposed model can accurately capture the size effects in the metamaterial.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Robin Darleux, Boris Lossouarn, Ivan Giorgio, Francesco dell'Isola, Jean-Francois Deu
Summary: This paper applies the method of electric analog synthesis to design a piezo-electro-mechanical arch capable of demonstrating multimodal damping capacity. Spatial and frequency coherence conditions are verified for the damped modes, and analogous boundary conditions ensure consistency between the curved beam and the analog circuit. It is believed that these results could lead to the design of multi-physics metamaterials based on micro-structures exploiting multimodal damping principles.
MATHEMATICS AND MECHANICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Fan-Fan Wang, Hui-Hui Dai, Ivan Giorgio
Summary: This paper derives the weak form for clamped plates made of incompressible neo-Hookean material from uniformly valid asymptotic plate theory and studies numerical solutions using the finite-element software COMSOL. The accuracy and efficiency of the weak form are demonstrated by comparing numerical results for two-dimensional and three-dimensional models. Results show that the uniformly valid plate theory is reliable and implementable for moderately thick plates with large deformations.
MATHEMATICS AND MECHANICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Alberto M. Bersani, Antonio Cazzani, Ivan Giorgio, Mario Spagnuolo
MATHEMATICS AND MECHANICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Alessandro Ciallella, Davide Pasquali, Francesco D'Annibale, Ivan Giorgio
Summary: In this paper, a generalized two-field model for pantographic sheets is proposed to describe the mechanical behavior of the sheets, including cyclic extension tests in elastic regimes and damage initiation. Experimental tests were performed to validate the model, and the observed rupture and dissipation mechanisms were attributed to the shear deformation of the interconnecting pivots.
MATHEMATICS AND MECHANICS OF SOLIDS
(2022)
Article
Thermodynamics
Alessandro Ciallella, Francesco D'Annibale, Dionisio Del Vescovo, Ivan Giorgio
Summary: This paper aims to explore the mechanical potential of a material made of an orthogonal net of fibers arranged in logarithmic spirals. An annular plate is described with a second-gradient model to evaluate the material's behavior in a nonlinear elastic regime with large displacements and deformations. Mechanical tests are performed numerically under the finite element method approximation, and plots illustrating the overall mechanical behavior of the evaluated system are provided.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Mechanics
Fan-Fan Wang, Ting Wang, Xiaoliang Zhang, Yangchao Huang, Ivan Giorgio, Fan Xu
Summary: In this study, we investigate the wrinkling behavior and pitch-fork bifurcation of twisted thin films through experimental and theoretical approaches. We develop a refined finite-strain plate model and use the finite element method to quantitatively predict the post-buckling evolution of twist-induced wrinkling morphology. The effects of aspect ratios and pre-tension on the wrinkling profile are examined. Three distinguished wrinkling evolution regimes are revealed depending on the aspect ratios of thin films as the twisting angle increases.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Physics, Fluids & Plasmas
Luca Galantucci, Giorgio Krstulovic, Carlo F. Barenghi
Summary: We found that a toroidal bundle of quantized vortex rings in superfluid helium creates a significant wake in the normal fluid, reducing the friction and extending the bundle's lifetime. This effect resembles the drag reduction observed in systems of hydrodynamically cooperative agents like bacteria in aqueous suspensions, fungal spores in the atmosphere, and cyclists in pelotons.
PHYSICAL REVIEW FLUIDS
(2023)
Editorial Material
Thermodynamics
Zeljko Bozic, Siegfried Schmauder, Erkan Oterkus, Selda Oterkus, Emilio Barchiesi, Ivan Giorgio, Luca Placidi
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Mathematics, Applied
Dario Corona, Alessandro Della Corte
Summary: We study the measurable dynamical properties of the interval map generated by the model-case erasing substitution rho. We prove that the square of the map preserves the Lebesgue measure and is strongly mixing, thus ergodic. We also discuss the extension of the results to more general erasing maps.
ERGODIC THEORY AND DYNAMICAL SYSTEMS
(2023)
Article
Physics, Applied
Wandrille Ruffenach, Luca Galantucci, Carlo F. Barenghi
Summary: Drain vortices, characterized by the competition of vorticity's transport and diffusion, as well as the presence of viscous layers and a free surface, are commonly observed in daily life. A recent experimental study on drain vortices in liquid helium II, a quantum fluid with no viscosity and quantization of circulation in the superfluid component, reveals their complex physics. By using the Gross-Pitaevskii equation, a simple model is developed to capture the essential physics of drain vortices in pure superfluids, showing that they consist of twisting bundle of vortex lines that enhance the axial flow towards the drain.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Mechanics
R. Allena, D. Scerrato, A. M. Bersani, I. Giorgio
Summary: Bone remodelling is a self-adaptive process in bone tissue that aims to optimize its mechanical response to environmental demands. Osteocytes monitor this response and communicate with osteoblasts and osteoclasts to synthesize or reabsorb solid bone for proper functioning.
MECHANICS RESEARCH COMMUNICATIONS
(2023)
Article
Physics, Fluids & Plasmas
Luca Galantucci, Em Rickinson, Andrew W. Baggaley, Nick G. Parker, Carlo F. Barenghi
Summary: When the intensity of turbulence increases, the rate of kinetic energy dissipation decreases to a non-zero constant as smaller vortical flow structures are generated. This property, known as the dissipation anomaly, also applies to the quantum fluid liquid helium, which becomes inviscid at low temperatures. By performing numerical simulations and identifying the superfluid Reynolds number, evidence for a superfluid analog to the classical dissipation anomaly is shown.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Thermodynamics
Ivan Giorgio, Francesco dell'Isola, David J. J. Steigmann
Summary: A continuum theory of pantographic lattices, based on second-grade elasticity, is proposed to describe the mechanical behavior of materials with multiple layers of pantographic sheets. The model can predict the material response under different mechanical loads, including compression, torsion, and bending. Numerical simulations using the finite element method are conducted to assist in designing an experimental program using 3D-printed specimens made of different materials.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Multidisciplinary
Natalia Branecka, Mustafa Erden Yildizdag, Alessandro Ciallella, Ivan Giorgio
Summary: A macroscopic continuum model is proposed to predict the remodeling process in bone tissue. The model considers the independent evolution of two stiffness parameters to adapt to environmental changes, and the results suggest that this model can better explain the bone remodeling process.