Articoli di riviste: "FLEXIBLE PIEZOELECTRIC"

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XU, Qi, Long GU e Yong QIN. "Flexible piezoelectric nanogenerators". Chinese Science Bulletin 61, n. 12 (18 agosto 2015): 1288–97. http://dx.doi.org/10.1360/n972015-00724.

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Zhou, Lingyu. "Effective design of advanced flexible piezoelectric materials". Applied and Computational Engineering 7, n. 1 (21 luglio 2023): 179–87. http://dx.doi.org/10.54254/2755-2721/7/20230431.

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Abstract (sommario):

Piezoelectric ceramics are relatively common materials that can convert mechanical energy and electrical energy into each other. They are widely used in our life in electroacoustic devices, communication, navigation, precision measurement and ultrasonic energy conversion. Its texture is hard and brittle, its processability is not very good, and its use is limited. If piezoelectric ceramics are made into flexible piezoelectric composites by compounding with flexible matrices to improve mechanical properties, they can be applied to wearable and flexible devices. This paper briefly introduces the basic principle of the piezoelectric effect, introduces the preparation methods of three typical flexible piezoelectric composites and their dielectric, piezoelectric and mechanical properties, introduces the recent research work and the latest scientific research achievements of relevant teams, summarizes the research progress of flexible piezoelectric materials, and provides ideas for finding flexible piezoelectric composites that have good dielectric, piezoelectric and mechanical properties.

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Sa-Gong, G., A. Safari, S. J. Jang e R. E. Newnham. "Poling flexible piezoelectric composites". Ferroelectrics Letters Section 5, n. 5 (marzo 1986): 131–42. http://dx.doi.org/10.1080/07315178608202472.

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Guo, Shuaibing, Xuexin Duan, Mengying Xie, Kean Chin Aw e Qiannan Xue. "Composites, Fabrication and Application of Polyvinylidene Fluoride for Flexible Electromechanical Devices: A Review". Micromachines 11, n. 12 (3 dicembre 2020): 1076. http://dx.doi.org/10.3390/mi11121076.

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The technological development of piezoelectric materials is crucial for developing wearable and flexible electromechanical devices. There are many inorganic materials with piezoelectric effects, such as piezoelectric ceramics, aluminum nitride and zinc oxide. They all have very high piezoelectric coefficients and large piezoelectric response ranges. The characteristics of high hardness and low tenacity make inorganic piezoelectric materials unsuitable for flexible devices that require frequent bending. Polyvinylidene fluoride (PVDF) and its derivatives are the most popular materials used in flexible electromechanical devices in recent years and have high flexibility, high sensitivity, high ductility and a certain piezoelectric coefficient. Owing to increasing the piezoelectric coefficient of PVDF, researchers are committed to optimizing PVDF materials and enhancing their polarity by a series of means to further improve their mechanical–electrical conversion efficiency. This paper reviews the latest PVDF-related optimization-based materials, related processing and polarization methods and the applications of these materials in, e.g., wearable functional devices, chemical sensors, biosensors and flexible actuator devices for flexible micro-electromechanical devices. We also discuss the challenges of wearable devices based on flexible piezoelectric polymer, considering where further practical applications could be.

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Banno, Hisao, Kohji Ogura, Hideo Sobue e Kanji Ohya. "Piezoelectric and Acoustic Properties of Piezoelectric Flexible Composites". Japanese Journal of Applied Physics 26, S1 (1 gennaio 1987): 153. http://dx.doi.org/10.7567/jjaps.26s1.153.

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Zhou, Yu Hua, Yu Tao Ju e Chang Sheng Zhou. "Design of Flexible Wing with Embedded Piezoelectric Actuator". Applied Mechanics and Materials 325-326 (giugno 2013): 951–55. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.951.

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This paper introduces a new kind of flexible wing with embedded piezoelectric actuator as framework for Micro Air Vehicles (MAV), which was fixed spar in the previous flexible wing. This made it a controllable flexible wing because the new flexible wing can not only works as previous model without control, but also can change its wing profiles in our purpose by using the embedded piezoelectric actuator when its necessary. The mathematical model of the deformation of piezoelectric actuator under control has developed. with which the structure of the flexible wing was designed. The simulation of dynamic characteristic of the flexible wing with embedded piezoelectric actuator has been done with ANSYS software.

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Choi, Sejin, Jihwan Lim, Hansol Park e Han Seong Kim. "A Flexible Piezoelectric Device for Frequency Sensing from PVDF/SWCNT Composite Fibers". Polymers 14, n. 21 (7 novembre 2022): 4773. http://dx.doi.org/10.3390/polym14214773.

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Polymer piezoelectric devices have been widely studied as sensors, energy harvesters, and generators with flexible and simple processes. Flexible piezoelectric devices are sensitive to external stimuli and are attracting attention because of their potential and usefulness as acoustic sensors. In this regard, the frequency sensing of sound must be studied to use flexible piezoelectric devices as sensors. In this study, a flexible piezoelectric device composed of a polymer and an electrode was successfully fabricated. Polyvinylidene fluoride, the active layer of the piezoelectric device, was prepared by electrospinning, and electrodes were formed by dip−coating in a prepared single−walled carbon nanotube dispersion. The output voltage of the external sound was matched with the input frequency through a fast Fourier transform, and frequency matching was successfully performed, even with mechanical stimulation. In a high−frequency test, the piezoelectric effect and frequency domain peak started to decrease sharply at 300 Hz, and the limit of the piezoelectric effect and sensing was observed from 800 Hz. The results of this study suggest a method for developing flexible piezoelectric-fiber frequency sensors based on piezoelectric devices for acoustic sensor systems.

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Li, Chong, Liang Shen, Jiang Shao e Jiwen Fang. "Simulation and Experiment of Active Vibration Control Based on Flexible Piezoelectric MFC Composed of PZT and PI Layer". Polymers 15, n. 8 (7 aprile 2023): 1819. http://dx.doi.org/10.3390/polym15081819.

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In order to improve the vibration suppression effect of the flexible beam system, active control based on soft piezoelectric macro-fiber composites (MFCs) consisting of polyimide (PI) sheet and lead zirconate titanate (PZT) is used to reduce the vibration. The vibration control system is composed of a flexible beam, a sensing piezoelectric MFC plate, and an actuated piezoelectric MFC plate. The dynamic coupling model of the flexible beam system is established according to the theory of structural mechanics and the piezoelectric stress equation. A linear quadratic optimal controller (LQR) is designed based on the optimal control theory. An optimization method, designed based on a differential evolution algorithm, is utilized for the selection of weighted matrix Q. Additionally, according to theoretical research, an experimental platform is built, and vibration active control experiments are carried out on piezoelectric flexible beams under conditions of instantaneous disturbance and continuous disturbance. The results show that the vibration of flexible beams is effectively suppressed under different disturbances. The amplitudes of the piezoelectric flexible beams are reduced by 94.4% and 65.4% under the conditions of instantaneous and continuous disturbances with LQR control.

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Ryu, Jeongjae, Hanbert Jeong, Yugang Chen, Chungik Oh, Jaegyu Kim, Hongjun Kim, Seongwoo Cho et al. "Flexible piezoelectric liquid volume sensor". Sensors and Actuators A: Physical 276 (giugno 2018): 219–25. http://dx.doi.org/10.1016/j.sna.2018.04.035.

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Lu, Lijun, Wenqing Ding, Jingquan Liu e Bin Yang. "Flexible PVDF based piezoelectric nanogenerators". Nano Energy 78 (dicembre 2020): 105251. http://dx.doi.org/10.1016/j.nanoen.2020.105251.

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Duan, Shengshun, Jun Wu, Jun Xia e Wei Lei. "Innovation Strategy Selection Facilitates High-Performance Flexible Piezoelectric Sensors". Sensors 20, n. 10 (15 maggio 2020): 2820. http://dx.doi.org/10.3390/s20102820.

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Abstract (sommario):

Piezoelectric sensors with high performance and low-to-zero power consumption meet the growing demand in the flexible microelectronic system with small size and low power consumption, which are promising in robotics and prosthetics, wearable devices and electronic skin. In this review, the development process, application scenarios and typical cases are discussed. In addition, several strategies to improve the performance of piezoelectric sensors are summed up: (1) material innovation: from piezoelectric semiconductor materials, inorganic piezoceramic materials, organic piezoelectric polymer, nanocomposite materials, to emerging and promising molecular ferroelectric materials. (2) designing microstructures on the surface of the piezoelectric materials to enlarge the contact area of piezoelectric materials under the applied force. (3) addition of dopants such as chemical elements and graphene in conventional piezoelectric materials. (4) developing piezoelectric transistors based on piezotronic effect. In addition, the principle, advantages, disadvantages and challenges of every strategy are discussed. Apart from that, the prospects and directions of piezoelectric sensors are predicted. In the future, the electronic sensors need to be embedded in the microelectronic systems to play the full part. Therefore, a strategy based on peripheral circuits to improve the performance of piezoelectric sensors is proposed in the final part of this review.

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Lu, En, Wei Li, Xuefeng Yang, Yuqiao Wang e Yufei Liu. "Optimal placement and active vibration control for piezoelectric smart flexible manipulators using modal H2 norm". Journal of Intelligent Material Systems and Structures 29, n. 11 (25 aprile 2018): 2333–43. http://dx.doi.org/10.1177/1045389x18770851.

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The optimal placement and active vibration control for piezoelectric smart single flexible manipulator are investigated in this study. Based on the assumed mode method and Hamilton’s principle, the dynamic equation of the piezoelectric smart single flexible manipulator is established. Then, the singular perturbation method is adopted and the coupled dynamic equation is decomposed into slow (rigid) and fast (flexible) subsystems. After that, the couple optimal placement criterion of piezoelectric actuators is proposed on the base of modal H2 norm of the fast subsystem and the change rate of natural frequencies. Using an improved particle swarm optimization algorithm, the optimal placement of piezoelectric actuators is realized. Subsequently, in order to verify the validity and feasibility of the presented optimal placement criterion, the composite controller is designed for the active vibration control of the piezoelectric smart single flexible manipulator. Finally, numerical simulations and experiments are presented. The results demonstrate that the piezoelectric smart single flexible manipulator system has a better single modal controllability and observability and has a good result on the vibration suppression using the optimization results of actuators. The proposed optimal placement criterion and method are feasible and effective.

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Lou, Jun Qiang, e Yan Ding Wei. "Design and Application of a Novel Piezoelectric Torsional Actuator". Applied Mechanics and Materials 66-68 (luglio 2011): 1149–54. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1149.

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In this paper, a piezoelectric torsional actuator generating angular displacement from piezoelectric shear strain is proposed. The procedure for the design, and manufacture of the piezoelectric torsional actuator are presented. To evaluate the performance of the proposed piezoelectric torsional actuator, the torsional vibration suppression of a flexible manipulator system with the proposed actuator is studied. The experimental results show the piezoelectric torsional actuator is capable of producing large torque and angular displacement and is suited for vibration suppression on flexible torsional manipulator system.

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Chen, Ning, e Xianfu Liu. "Dynamic Modeling and Attitude Decoupling Control for a 3-DOF Flexible Piezoelectric Nano-Positioning Stage Based on ADRC". Micromachines 13, n. 10 (25 settembre 2022): 1591. http://dx.doi.org/10.3390/mi13101591.

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The paper proposes a three-degrees-of-freedom flexible nano-positioning stage constructed from compliant flexures and piezoelectric thin-sheet actuators, featuring a compact size and fast dynamic responses, which can be extensively applied to the typical micro/nano-positioning applications. Meanwhile, the dynamic model of the flexible PZT nano-positioning with distributed parameter characteristics is established to distinctly reflect the piezoelectric–mechanical coupling relationship between the four flexible PZT actuators and the three outputs of such a system. Furthermore, the attitude decoupling control for the 3-DOF flexible piezoelectric nano-positioning stage is achieved by the Active Disturbance Rejection Control (ADRC) method to compensate for the positioning errors in the actual positioning process. After this, a real-time experimental apparatus with two Position-Sensitive Detectors (PSDs) is also proposed and fabricated to test the three outputs of the flexible piezoelectric thin-sheet (PZT-5A) nano-positioning stage and validate the effectiveness of the dynamic modeling method and attitude decoupling control in the piezoelectric nano-positioning stage ranges.

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Liu, Xia, Tong-yu Wang, Hai-gang Wang e Xiao-chao Tian. "Design and Testing of Flexible Contacts for Piezoelectric Hydraulic Amplified Braille Dot Display". Journal of Nanoelectronics and Optoelectronics 17, n. 4 (1 aprile 2022): 710–19. http://dx.doi.org/10.1166/jno.2022.3244.

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To realize flexible output and fast response in Braille spotter contacts, in this study, a flexible contact structure of piezoelectric hydraulic amplified Braille spotter was designed. First, the structure and working principle of the piezoelectric Braille contact were designed and analyzed. Next, the mechanical model of the system was established, the expressions for the output displacement and amplification ratio of the flexible film and piezoelectric oscillator were derived, and the parameters affecting the output displacement and amplification ratio were determined. In addition, piezoelectric oscillator vibrations and the deformation of the flexible film of the hydraulic amplification structure were simulated using COMSOL Multiphysics software. Finally, the prototype was fabricated and tested experimentally. The results showed that the displacement of the flexible contact was 0.402 mm at a driving voltage and resonant frequency of 170 V and 282 Hz, respectively, and a displacement amplification of 10.1× was achieved. The response time of the piezoelectric Braille contact is less than 5 ms, which meets the requirement for application in tactile reading.

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Li, H., Zhaobo Chen e Yinghou Jiao. "Active vibration control characteristics of flexible manipulator with laminated piezoelectric actuator". Abstracts of the international conference on advanced mechatronics : toward evolutionary fusion of IT and mechatronics : ICAM 2010.5 (2010): 798–802. http://dx.doi.org/10.1299/jsmeicam.2010.5.798.

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Khan, Barlas Raheel, Shingo Okamoto e Jae Hoon Lee. "617 Vibration Control of a Flexible Link Manipulator Using Piezoelectric Actuators". Proceedings of Conference of Chugoku-Shikoku Branch 2014.52 (2014): _617–1_—_617–3_. http://dx.doi.org/10.1299/jsmecs.2014.52._617-1_.

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Jiang, Yijing, Yongju Deng e Hongyan Qi. "Microstructure Dependence of Output Performance in Flexible PVDF Piezoelectric Nanogenerators". Polymers 13, n. 19 (24 settembre 2021): 3252. http://dx.doi.org/10.3390/polym13193252.

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Abstract (sommario):

Flexible piezoelectric nanogenerators have attracted great attention due to their ability to convert ambient mechanical energy into electrical energy for low-power wearable electronic devices. Controlling the microstructure of the flexible piezoelectric materials is a potential strategy to enhance the electrical outputs of the piezoelectric nanogenerator. Three types of flexible polyvinylidene fluoride (PVDF) piezoelectric nanogenerator were fabricated based on well-aligned nanofibers, random oriented nanofibers and thick films. The electrical output performance of PVDF nanogenerators is systematically investigated by the influence of microstructures. The aligned nanofiber arrays exhibit highly consistent orientation, uniform diameter, and a smooth surface, which possesses the highest fraction of the polar crystalline β phase compared with the random-oriented nanofibers and thick films. The highly aligned structure and the large fraction of the polar β phase enhanced the output performance of the well-aligned nanofiber nanogenerator. The highest output voltage of 14 V and a short-circuit current of 1.22 µA were achieved under tapping mode of 10 N at 2.5 Hz, showing the potential application in flexible electronic devices. These new results shed some light on the design of the flexible piezoelectric polymer-based nanogenerators.

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Shi, Yunlai, Chengshu Lou e Jun Zhang. "Investigation on a Linear Piezoelectric Actuator Based on Stick-Slip/Scan Excitation". Actuators 10, n. 2 (20 febbraio 2021): 39. http://dx.doi.org/10.3390/act10020039.

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To perform a high resolution and long stroke application in optical precision instruments, a linear piezoelectric actuator operated in stick-slip/scan modes for driving a linear motion table is presented. The proposed piezoelectric actuator is a piezoelectric composite structure, which includes a metal elastomer, a piezoelectric stack, and a frictional ball. The purpose of this paper is to describe the operation principle, design, and the running test and resolution test of the linear motion table driven by the proposed piezoelectric actuator. The notable feature is the flexible hinges of the actuator, including composite hinge, pre-pressure adjustment flexible hinge, and transmission flexible hinge, which are designed for decoupling the motion in the action direction of the piezoelectric stack and the direction in which the pre-pressure is applied. A prototype has been fabricated and two operation modes of the piezoelectric actuator, stick-slip and scan mode, were utilized to test the driving characteristics of the linear motion table. Experimental results show that the finest step resolutions in stick-slip mode and scan mode achieved 12 nm and 4 nm, respectively.

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Zhang, Juan, Ya Feng Shu e Bin Bai. "Dynamic Modeling on Smart Flexible Beam with Large Overall Planar Motion". Applied Mechanics and Materials 387 (agosto 2013): 147–51. http://dx.doi.org/10.4028/www.scientific.net/amm.387.147.

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A simplified smart flexible spatial piezoelectric beam with overall motions is studied in this paper. Considering the geometrically nonlinear effect resulting from curved and twisted deformations, and considering the kinetic energy of the piezoelectric actuator and the coupled terms of deformations in the longitudinal, lateral and transversal directions, and taking into account the coupling of electric performance of piezoelectric material and structure deformation, finally, the Rigid-flexible-electric coupling dynamic model of piezoelectric smart beam is established by infinite element method and Lagrange equation.

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Chen, Caifeng, Daiwei Hong, Andong Wang e Chaoying Ni. "Fabrication of Flexible Piezoelectric PZT/Fabric Composite". Scientific World Journal 2013 (2013): 1–4. http://dx.doi.org/10.1155/2013/914380.

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Flexible piezoelectric PZT/fabric composite material is pliable and tough in nature which is in a lack of traditional PZT patches. It has great application prospect in improving the sensitivity of sensor/actuator made by piezoelectric materials especially when they are used for curved surfaces or complicated conditions. In this paper, glass fiber cloth was adopted as carrier to grow PZT piezoelectric crystal particles by hydrothermal method, and the optimum conditions were studied. The results showed that the soft glass fiber cloth was an ideal kind of carrier. A large number of cubic-shaped PZT nanocrystallines grew firmly in the carrier with a dense and uniform distribution. The best hydrothermal condition was found to be pH 13, reaction time 24 h, and reaction temperature 200°C.

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Cha, Youngsu, Hojoon Kim e Doik Kim. "Flexible Piezoelectric Sensor-Based Gait Recognition". Sensors 18, n. 2 (5 febbraio 2018): 468. http://dx.doi.org/10.3390/s18020468.

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Sakamoto, Walter Katsumi, Edmilson de Souza e Dilip K. Das-Gupta. "Electroactive properties of flexible piezoelectric composites". Materials Research 4, n. 3 (luglio 2001): 201–4. http://dx.doi.org/10.1590/s1516-14392001000300010.

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Yang, Yi, He Tian, Bing Yan, Hui Sun, Can Wu, Yi Shu, Li-Gang Wang e Tian-Ling Ren. "A flexible piezoelectric micromachined ultrasound transducer". RSC Advances 3, n. 47 (2013): 24900. http://dx.doi.org/10.1039/c3ra44619k.

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Kim, Yeunhee, Kahye Song, Jae-Bok Song e Youngsu Cha. "Energy harvesting from flexible piezoelectric ring". Smart Materials and Structures 28, n. 8 (23 luglio 2019): 084007. http://dx.doi.org/10.1088/1361-665x/ab29a8.

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Harvey, G., A. Gachagan, J. W. Mackersie, T. Mccunnie e R. Banks. "Flexible ultrasonic transducers incorporating piezoelectric fibres". IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 56, n. 9 (settembre 2009): 1999–2009. http://dx.doi.org/10.1109/tuffc.2009.1276.

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Indri, M., e A. Tornambè. "Robust regulation for flexible piezoelectric structures". IFAC Proceedings Volumes 27, n. 11 (settembre 1994): 199–204. http://dx.doi.org/10.1016/s1474-6670(17)47647-6.

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Sim, Hyeon Jun, Changsoon Choi, Chang Jun Lee, Youn Tae Kim, Geoffrey M. Spinks, Marcio D. Lima, Ray H. Baughman e Seon Jeong Kim. "Flexible, stretchable and weavable piezoelectric fiber". Advanced Engineering Materials 17, n. 9 (6 febbraio 2015): 1270–75. http://dx.doi.org/10.1002/adem.201500018.

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Malhis, M., L. Gaudiller e J. Der Hagopian. "Fuzzy Modal Active Control of Flexible Structures". Journal of Vibration and Control 11, n. 1 (gennaio 2005): 67–88. http://dx.doi.org/10.1177/10775463045046028.

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In this paper we propose a new active control strategy to control the dynamic behavior of flexible structures: fuzzy modal control (FMC). This strategy, based on the modal state feedback of the structure, uses independent fuzzy controllers for each mode to be controlled. This method is applied to a flexible beam controlled by a transverse plane of action using piezoelectric actuators. First of all, a model of a piezoelectric actuator is proposed, followed by the formulation of a finite-element model of the mechanical structure/actuator. The model is then fitted using an identification of the characteristics. After modal reduction, the FMC is carried out in two steps: the control of the beam in only one transverse direction by a piezoelectric pusher, then in two transverse directions by two orthogonal piezoelectric pushers located on the same plane. A digital controller was built in the Matlab®-Simulink® environment, and implemented on specialized cards in order to perform the corresponding experiment. The method is validated by comparing the results between the simulation and the experiment.

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Jeong, Chang Kyu, Kwi-Il Park, Jung Hwan Son, Geon-Tae Hwang, Seung Hyun Lee, Dae Yong Park, Han Eol Lee, Hwan Keon Lee, Myunghwan Byun e Keon Jae Lee. "Self-powered fully-flexible light-emitting system enabled by flexible energy harvester". Energy Environ. Sci. 7, n. 12 (2014): 4035–43. http://dx.doi.org/10.1039/c4ee02435d.

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We present a self-powered all-flexible light-emitting optoelectronic device using a flexible and high-performance piezoelectric energy harvester with a robustly developed flexible and vertically structured inorganic LED array.

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Zhang, Ting, e Hongguang Li. "Adaptive modal vibration control for smart flexible beam with two piezoelectric actuators by multivariable self-tuning control". Journal of Vibration and Control 26, n. 7-8 (6 gennaio 2020): 490–504. http://dx.doi.org/10.1177/1077546319889842.

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It has been popular for decades that the vibrations of space structures are suppressed with smart actuators. However, the higher mode vibrations are often motivated when a control strategy is applied to attenuate the vibration for the smart structures. Moreover, if the multi-mode vibration of a smart structure is suppressed with multi-actuators, a proper multivariable control law will be adopted to solve the coupling problem caused by the multi-actuators of the smart structure. Therefore, in the paper, a decoupling technique for two modal vibrations of a smart flexible beam with two piezoelectric patches is adopted by adaptive control. The proposed control law is designed with a multivariable minimum variance self-tuning control. Considering the first two orders of modal vibrations, two piezoelectric patches are configured on the flexible beam according to the strain of the first two orders of modal vibrations along the longitudinal direction of the beam. A dynamical model for the flexible beam with two piezoelectric actuators is constructed by the mode superposition method. With the dynamical model, simulations are implemented to suppress the free vibration of the flexible beam. Moreover, experiments are carried out to verify the effectiveness of the multivariable minimum variance self-tuning control for vibration suppression of the flexible structure. The control results clearly show that the free vibration amplitude of the cantilevered beam with two control voltages applied to the two piezoelectric patches is less than that with one control voltage applied to the first piezoelectric actuator. Thus, multivariable minimum variance self-tuning control is a more efficient approach for suppressing multimodal vibration for a smart flexible beam with two piezoelectric actuators compared with the conventional velocity feedback control.

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Pattipaka, Srinivas, Young Min Bae, Chang Kyu Jeong, Kwi-Il Park e Geon-Tae Hwang. "Perovskite Piezoelectric-Based Flexible Energy Harvesters for Self-Powered Implantable and Wearable IoT Devices". Sensors 22, n. 23 (5 dicembre 2022): 9506. http://dx.doi.org/10.3390/s22239506.

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In the ongoing fourth industrial revolution, the internet of things (IoT) will play a crucial role in collecting and analyzing information related to human healthcare, public safety, environmental monitoring and home/industrial automation. Even though conventional batteries are widely used to operate IoT devices as a power source, these batteries have a drawback of limited capacity, which impedes broad commercialization of the IoT. In this regard, piezoelectric energy harvesting technology has attracted a great deal of attention because piezoelectric materials can convert electricity from mechanical and vibrational movements in the ambient environment. In particular, piezoelectric-based flexible energy harvesters can precisely harvest tiny mechanical movements of muscles and internal organs from the human body to produce electricity. These inherent properties of flexible piezoelectric harvesters make it possible to eliminate conventional batteries for lifetime extension of implantable and wearable IoTs. This paper describes the progress of piezoelectric perovskite material-based flexible energy harvesters for self-powered IoT devices for biomedical/wearable electronics over the last decade.

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de Oliveira, Aguinaldo Soares, Douglas da Costa Ferreira, Fábio Roberto Chavarette, Nelson José Peruzzi e Viviane Cassol Marques. "Piezoelectric Optimum Placement via LQR Controller". Advanced Materials Research 1077 (dicembre 2014): 166–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1077.166.

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The piezoelectric elements have received important attention from researchers because the piezoelectric materials are small, lightweight and resilient against adverse working environments and also piezoelectric materials can be used as both actuators and sensors. Actuators and sensors placement identification is a center study to avoid undesirable effects in flexible structure under control such as lack of observability and controllability system. In this research it was used a singular analysis of input control matrix as a piezoelectric placement tool and after piezoelectric placement study it was checked these positions through the piezoelectric elements placement in an optimum and no optimum positions and simulating the control through linear quadratic regulator technique in both positions. The flexible structure used as a model is a simply supported beam. As a main result the simulation demonstrate to be robust to piezoelectric placement identification.

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Li, Ke Tian, Xin Chen, Xin Du Chen, Qiang Liu e Huan Wei Zhou. "Study on the Fast Tool Servo (FTS) with the Replaceable Flexible Hinge". Key Engineering Materials 625 (agosto 2014): 398–401. http://dx.doi.org/10.4028/www.scientific.net/kem.625.398.

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It is a FTS with flexible hinge that can be replaceable. It includes flexible hinges, a movable block, piezoelectric ceramic driver and framework. The flexible hinge is installed on inner side of the frame, and the other side is connected with the movable block. The piezoelectric ceramic driver is installed in movable block, and its other end is installed on the end beam of the frame. There is a tool base in the front end of the movable block on which the diamond tools can be fixed. Under the support of the flexible hinges, the tool can move back and front driven be piezoelectric ceramic driver. Through the simulation analyses with finite element technology and experiment, it is certify that the design of FTS is successful and practical to further study.

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Liu, Guo Hua, Li Sui e Geng Chen Shi. "The Electricity Performance of Flexible Piezoelectric Generator". Applied Mechanics and Materials 556-562 (maggio 2014): 2035–38. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2035.

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A FPEG (flexible piezoelectric generator) composed of PVDF (polyvinylidene fluoride) piezoelectric film, conducting resin and titanium alloy substrate, which occupies less room and produces electrical energy while the axial wind flows through the oscillator surface. When the axial wind flows through the generator surface, generator begins to vibrate and produce electrical energy, as the wind speed reaches a critical value, generator yields resonance phenomenon. In this paper, more work was placed on how the substrate structure parameters such as length, width and thickness affected the power generation capacity in resonance mode.

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Jing, Ben, e Wang Hao. "Vibration Analysis of Rotating Wind Turbine Blades Based on Piezoelectric Materials". International Journal of Acoustics and Vibration 26, n. 1 (30 marzo 2021): 49–55. http://dx.doi.org/10.20855/ijav.2020.25.11721.

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Piezoelectric materials have a piezoelectric effect that converts mechanical energy into electrical energy. In this paper, the blades of the rotating wind turbine are simplified as flexible beams fixed on the rotating wheels, and piezoelectric ceramics are added to the beams as sensors and actuators respectively to establish an analysis model of the vibration behavior of the piezoelectric sandwich rotating wind turbine blades. Based on Newton's second law, different accelerations are added to the rotating wheel to obtain the differential equation of a vibration variable coefficient. The fourth order Runge-Kutta method is used to solve variable coefficient differential equations. The hypothetical modal method is applied to solve the displacement of the free end of the flexible beam. A numerical simulation is also carried out to analyse the magnitude and change trend of the voltage output by adding piezoelectric materials at different angular velocities. The results show that the greater the rotational angular velocity, the greater the displacement of the free end of the flexible beam, and the greater the voltage due to the piezoelectric effect of the piezoelectric material. When the rotation angular velocity reaches a stable value, the displacement of the free end and the generated voltage will also reach a stable value.

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37

Park, Teahoon, Byeonggwan Kim, Younghoon Kim e Eunkyoung Kim. "Highly conductive PEDOT electrodes for harvesting dynamic energy through piezoelectric conversion". J. Mater. Chem. A 2, n. 15 (2014): 5462–69. http://dx.doi.org/10.1039/c3ta14726f.

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38

Parangusan, Hemalatha, Jolly Bhadra e Noora Al-Thani. "Flexible piezoelectric nanogenerator based on [P(VDF-HFP)]/ PANI-ZnS electrospun nanofibers for electrical energy harvesting". Journal of Materials Science: Materials in Electronics 32, n. 5 (19 febbraio 2021): 6358–68. http://dx.doi.org/10.1007/s10854-021-05352-4.

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Abstract Over the past decade, piezoelectric nanogenerator have attracted much attention to harvest mechanical energy from abundant resources in nature. Here, the ZnS microspheres is prepared by hydrothermal method and core-shell structured PANI/ZnS microspheres are synthesized by in situ polymerization method and then used as filler for the preparation of flexible [P(VDF-HFP)] based piezoelectric nanogenerator. The flexible P(VDF-HFP)/PANI-ZnS piezoelectric nanogenerator is prepared by Electrospinning technique. The core-shell PANI/ZnS composite improves the content of electroactive phase in [P(VDF-HFP)] and significantly improves the interfacial polarization between the PANI/ZnS particles and polymer matrix. Among all the samples, [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers exhibited the high piezoelectric peak-to-peak output voltage of 3 V compared with the neat [P(VDF-HFP)] (~ 120 mV). In addition, the high dielectric constant is observed for the [P(VDF-HFP)]/2 wt% PANI-ZnS composite nanofibers. These results implies that the fabricated flexible and efficient piezoelectric nanogenerator can be utilized for energy harvesting system.

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39

Zhou, Zhenji, Jinglei Li, Weimin Xia, Xuan Zhu, Tao Sun, Congjun Cao e Lin Zhang. "Enhanced piezoelectric and acoustic performances of poly(vinylidene fluoride-trifluoroethylene) films for hydroacoustic applications". Physical Chemistry Chemical Physics 22, n. 10 (2020): 5711–22. http://dx.doi.org/10.1039/c9cp06553a.

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40

Chen, Xinyu. "The Applications of Nano-Piezoelectric Composite in Flexible Wearable Self-Powered System". Journal of Physics: Conference Series 2393, n. 1 (1 dicembre 2022): 012007. http://dx.doi.org/10.1088/1742-6596/2393/1/012007.

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Abstract Nanomaterials have permeated every sphere of life, industry, and research. Due to the unique piezoelectric properties of nanometer materials and piezoelectric types, it is possible to convert mechanical energy into electricity by certain mathematical relationships, equivalent to the energy supply for equipment. This capability allows for the creation of sensitive sensor elements that can perceive the external environment on various levels, including thermal, mechanical, electrical, and optical. The generation of piezoelectric nanogenerators indicates that nanomaterials devices can be expected to achieve a natural self-powered system without external power or only provide a small amount of energy, and play an irreplaceable role in the fields of microelectronics, artificial intelligence, and human-computer interaction. In this review, examples of nano-piezoelectric ceramic materials and nano-piezoelectric polymers that can be applied to flexible self-powered systems are listed, and the advantages and problems of these two kinds of materials in flexible self-powered systems are comprehensively analyzed. This paper focuses on the performance improvement of 0-3 nano-composites on the original piezoelectric ceramics and polymer materials and their application in the flexible wearable self-powered system. In addition, it summarizes the difficulties and challenges in their practical applications and provides future research directions for researchers.

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41

Xie, Linfang, Guoliang Wang, Chao Jiang, Fapeng Yu e Xian Zhao. "Properties and Applications of Flexible Poly(Vinylidene Fluoride)-Based Piezoelectric Materials". Crystals 11, n. 6 (6 giugno 2021): 644. http://dx.doi.org/10.3390/cryst11060644.

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Poly (vinylidene fluoride) (PVDF) is a kind of semicrystalline organic polymer piezoelectric material. Adopting processes such as melting crystallization and solution casting, and undergoing post-treatment processes such as annealing, stretching, and polarization, PVDF films with high crystallinity and high piezoelectric response level can be realized. As a polymer material, PVDF shows excellent mechanical properties, chemical stability and biocompatibility, and is light in weight, easily prepared, which can be designed into miniaturized, chip-shaped and integrated devices. It has a wide range of applications in self-powered equipment such as sensors, nanogenerators and currently is a research hotspot for use as flexible wearable or implantable materials. This article mainly introduces the crystal structures, piezoelectric properties and their applications in flexible piezoelectric devices of PVDF materials.

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42

Ding, Yuxing, Ranran Geng, Ruijian Zhu, Weimin Zhang, Weijie Wang e Zengmei Wang. "Self-powered flexible piezoelectric sensor based on PbZr_0.52Ti_0.48O₃ nanofibers for impact force monitoring and rubber mat aging assessment". Smart Materials and Structures 31, n. 2 (27 dicembre 2021): 025015. http://dx.doi.org/10.1088/1361-665x/ac437f.

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Abstract In this work, a flexible piezoelectric sensor was fabricated based on PbZr0.52Ti0.48O3(PZT) nanofibers (NFs) composite, and its potential applications in impact force monitoring and rubber mat aging assessment were reported. The lead zirconate titanate (PZT) piezoelectric NFs with diameters of 150–260 nm were prepared via electrospinning technique, showing a high piezoelectric coefficient (d 33 ∼ 92.5 pm V−1) for piezoelectric fibers. The PZT NFs and carbon nanotubes (CNTs) were dispersed in polydimethylsiloxane (PDMS) to fabricate a highly stretchable and flexible impact sensor (PZT/CNTs/PDMS piezoelectric nanocomposite sensor), which showed excellent low frequency sensitivity (as low as 0.01 Hz), high bending deformation sensitivity (as low as 0.192 cm−1 curvature deformation with 6.64 V cm−1 sensitivity) and cycle stability under external impact force. Besides, it is the first attempt to assess railway tracks rubber mat aging based on piezoelectric nanocomposite impact sensor, and the static stiffness relative error reaches a low value of 6.91%.

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43

An, Zeng Yong, Ming Long Xu, Fu Yang Tao e Bo Feng. "Vibration Active Control Based on Torque Actuator of Piezoelectric-Stack". Advanced Materials Research 718-720 (luglio 2013): 1249–56. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.1249.

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Combining with the advantages of the piezoelectric material, positive and negative torque actuator using dual piezoelectric-stack is developed for vibration active control of annular flexible structure in this paper. The working principle of the actuator is described, and the output performance of the actuator is tested in this paper. Also the actuator is applied successfully to the vibration active control of annular flexible structure.

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44

Jin, Guang, e Mingcong Deng. "Operator-based nonlinear free vibration control of a flexible plate with sudden perturbations". Transactions of the Institute of Measurement and Control 42, n. 7 (20 dicembre 2019): 1375–87. http://dx.doi.org/10.1177/0142331219891352.

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In this paper, a new nonlinear vibration control scheme using piezoelectric actuator is proposed for a flexible plate with a free vibration and sudden perturbations. First, the effect of hysteresis nonlinearity from the piezoelectric actuator is considered by Prandtl-Ishlinskii (P-I) hysteresis model. Simultaneously, a dynamic model of the flexible plate with piezoelectric actuator is considered. Then, based on the dynamic model of the flexible plate, operator-based controllers are designed to guarantee the robust stability of the nonlinear control system. In addition, for ensuring the desired vibration control performance of the flexible plate with a free vibration and sudden perturbations, operator-based compensation method is given by the proposed design scheme. In the designed compensator, the desired compensation performances of tracking and of perturbations are obtained by increasing the number of designed n-times feedback loops. Finally, both of numerical simulation and experimental result are shown to verify the effectiveness of the proposed design scheme.

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Liu, Wei, Chunling Zhu e Dawei Wu. "Flexible piezoelectric micro ultrasonic transducer array integrated on various flexible substrates". Sensors and Actuators A: Physical 317 (gennaio 2021): 112476. http://dx.doi.org/10.1016/j.sna.2020.112476.

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46

Yu, Yang, Xiao-Xiong Wang, Guixu Xie, Junqing Ma, Tianyang Lv, Kefan Du, Han Hu et al. "Preparation and piezoelectric catalytic performance of flexible inorganic Ba_1−xCa_xTiO₃via electrospinning". Journal of Materials Chemistry A 9, n. 43 (2021): 24695–703. http://dx.doi.org/10.1039/d1ta05151b.

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47

Wu, Mengjun, Ting Zheng, Haiwu Zheng, Jifang Li, Weichao Wang, Mingsai Zhu, Fengzhu Li, Gentian Yue, Yuzong Gu e Jiagang Wu. "High-performance piezoelectric-energy-harvester and self-powered mechanosensing using lead-free potassium–sodium niobate flexible piezoelectric composites". Journal of Materials Chemistry A 6, n. 34 (2018): 16439–49. http://dx.doi.org/10.1039/c8ta05887c.

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Abstract (sommario):

A flexible piezoelectric nanogenerator (PENG) was fabricated based on a new inorganic piezoelectric KNN–BNZ–AS–Fe, which exhibited the great potential in energy harvesting and self-powered mechanosensing.

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48

Kaeopisan, Aphisak, e Hassakorn Wattanasarn. "Piezoelectric PVDF/CNT Flexible Applied on Motorcycle". Integrated Ferroelectrics 214, n. 1 (12 febbraio 2021): 166–72. http://dx.doi.org/10.1080/10584587.2020.1857193.

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49

Ogura, Kohji, Kanji Ohya e Hisao Banno. "Hydrostatic Pressure Properties of Piezoelectric Flexible Composites". Japanese Journal of Applied Physics 28, S1 (1 gennaio 1989): 60. http://dx.doi.org/10.7567/jjaps.28s1.60.

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50

Wang, Yong Rong, Pei Hua Zhang e Chun Ye Xu. "Develop Flexible Piezoelectric PVDF Nano-Fibrous Membrane". Materials Science Forum 675-677 (febbraio 2011): 465–68. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.465.

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Abstract (sommario):

Piezoelectric polymer, polyvinylidene fluoride (PVDF) film, has been widely investigated as sensor and transducer material due to its high piezo-, pyro-, and ferroelectric properties. However, there are many limitations for PVDF film as human-related tactile sensor, such as non-breathability, stretching, requirement of additional process like poling, etc. In this paper, PVDF nano-fibrous membrane which is light, flexible, and wearable was prepared by electrospinning technique. The electrospinning parameters such as the voltage, feeding rate, tip-tocollector distance, etc, were well controlled. More than 4 hours electrospinning time was needed for a certain thickness of PVDF nano-fibrous membrane. The morphology of PVDF nanofiber was determined by scanning electron microscopy (SEM), the diameter distribution was calculated and crystal structure was evaluated by FTIR spectroscopy. We found the feasibility of developing piezoelectric PVDF fibrous membranes through electrospinning technology, which is a good candidate for flexible human-related tactile sensors to sense garment pressure, blood pressure, heartbeat rate, accidental external impact on human body, etc.

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