Bibliographies thématiques / Piezopolymer sensor

Littérature scientifique sur le sujet « Piezopolymer sensor »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Piezopolymer sensor"

Chen, Yuquan, Liren Wang et Wen H. Ko. « A piezopolymer finger pulse and breathing wave sensor ». Sensors and Actuators A : Physical 23, n^o 1-3 (avril 1990) : 879–82. http://dx.doi.org/10.1016/0924-4247(90)87051-j.

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Bernasconi, Roberto, Davood Hatami, Hossein Nouri Hosseinabadi, Valentina Zega, Alberto Corigliano, Raffaella Suriano, Marinella Levi, Giacomo Langfelder et Luca Magagnin. « Hybrid additive manufacturing of a piezopolymer-based inertial sensor ». Additive Manufacturing 59 (novembre 2022) : 103091. http://dx.doi.org/10.1016/j.addma.2022.103091.

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Wang, Feng, Mami Tanaka et Seiji Chonan. « A PVDF piezopolymer sensor for unconstrained cardiorespiratory monitoring during sleep ». International Journal of Applied Electromagnetics and Mechanics 16, n^o 3-4 (29 décembre 2002) : 181–88. http://dx.doi.org/10.3233/jae-2002-236.

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Sasaki, Minoru, et Masayuki Okugawa. « Motion Control of a Piezopolymer Bimorph Flexible Microactuator ». Journal of Robotics and Mechatronics 7, n^o 6 (20 décembre 1995) : 467–73. http://dx.doi.org/10.20965/jrm.1995.p0467.

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An optimal feedback control of a flexible microactuator made of a bimorph piezoelectric high-polymer material (PVDF: Poly Vinylidene Fluoride), is proposed in this paper. This optimal feedback control is based on the assumption that the full state vector of the system is available for measurement although practically all state variables are very difficult to measure in the case of a distributed parameter system. An observer is used to estimate the entire state vector of the system, but the presence of sensor noise tends to adversely affect the convergence of the observer. This naturally leads to a stochastic observer commonly known as the Kalman filter. Numerical and experimental results demonstrate the effectiveness of the proposed controller design method.

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Wang, Feng, Mami Tanaka et Seiji Chonan. « Development of a PVDF Piezopolymer Sensor for Unconstrained In-Sleep Cardiorespiratory Monitoring ». Journal of Intelligent Material Systems and Structures 14, n^o 3 (mars 2003) : 185–90. http://dx.doi.org/10.1177/1045389x03014003006.

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Zuckerwar, A. J., R. A. Pretlow, J. W. Stoughton et D. A. Baker. « Development of a piezopolymer pressure sensor for a portable fetal heart rate monitor ». IEEE Transactions on Biomedical Engineering 40, n^o 9 (1993) : 963–69. http://dx.doi.org/10.1109/10.245618.

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Lee, Young Sup, et Ki Hong Shin. « Velocity Feedback with a Non-Collocated Pair of Sensor and Actuator for Tip Vibration Suppression of a Beam ». Key Engineering Materials 321-323 (octobre 2006) : 200–203. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.200.

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This paper presents a theoretical and experimental study of a non-collocated pair of piezopolymer PVDF sensor and piezoceramic PZT actuator, which are bonded on a cantilever beam, in order to suppress unwanted vibration at the tip of the beam. The PZT actuator patch was bonded near the clamped part and the PVDF sensor, which was triangularly shaped, was bonded on the other part of the beam. This is because the triangular PVDF sensor is known that it can detect the tip velocity of a cantilever beam. Because the arrangement of the sensor and actuator pair is not collocated and overlapped each other, the pair can avoid so called "in-plane coupling", which can be found at a matched piezoelectric sensor and actuator pair and restricts the stability and performance of direct velocity feedback control. The test beam is made of aluminum with the dimension of 200 × 20 × 2 mm. Before control, the sensor-actuator frequency response function is confirmed to have a nice phase response without accumulation in a reasonable frequency range of up to 5000 Hz. The feedback control attenuates the magnitude of the first two resonances in the error spectrum of about 6 -7 dB.

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Pullano, Salvatore A., Antonino S. Fiorillo, Gianluca Barile, Vincenzo Stornelli et Giuseppe Ferri. « A Second-Generation Voltage-Conveyor-Based Interface for Ultrasonic PVDF Sensors ». Micromachines 12, n^o 2 (20 janvier 2021) : 99. http://dx.doi.org/10.3390/mi12020099.

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Exploiting the transmission and reception of low frequency ultrasounds in air is often associated with the innate echolocating abilities of some mammals, later emulated with sophisticated electronic systems, to obtain information about unstructured environments. Here, we present a novel approach for the reception of ultrasounds in air, which exploits a piezopolymer broadband sensor and an electronic interface based on a second-generation voltage conveyor (VCII). Taking advantage of its capability to manipulate both voltage and current signals, in this paper, we propose an extremely simple interface that presents a sensitivity level of about −100 dB, which is in line with commercially available references. The presented results are obtained without any filtration stage. The second-generation voltage conveyor active device is implemented through a commercially available AD844, with a supply voltage of ±15 V.

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Chrysochoidis, N. A., et E. Gutiérrez. « Evaluation of the sensitivity and fatigue performance of embedded piezopolymer sensor systems in sandwich composite laminates ». Smart Materials and Structures 24, n^o 2 (23 janvier 2015) : 025032. http://dx.doi.org/10.1088/0964-1726/24/2/025032.

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Capineri, Lorenzo, et Andrea Bulletti. « A Versatile Analog Electronic Interface for Piezoelectric Sensors Used for Impacts Detection and Positioning in Structural Health Monitoring (SHM) Systems ». Electronics 10, n^o 9 (29 avril 2021) : 1047. http://dx.doi.org/10.3390/electronics10091047.

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Continuous monitoring of mechanical impacts is one of the goals of modern SHM systems using a sensor network installed on a structure. For the evaluation of the impact position, there are generally applied triangulation techniques based on the estimation of the differential time of arrival (DToA). The signals generated by impacts are multimodal, dispersive Lamb waves propagating in the plate-like structure. Symmetrical S0 and antisymmetrical A0 Lamb waves are both generated by impact events with different velocities and energies. The discrimination of these two modes is an advantage for impact positioning and characterization. The faster S0 is less influenced by multiple path signal overlapping and is also less dispersive, but its amplitude is generally 40–80 dB lower than the amplitude of the A0 mode. The latter has an amplitude related to the impact energy, while S0 amplitude is related to the impact velocity and has higher frequency spectral content. For these reasons, the analog front-end (AFE) design is crucial to preserve the information of the impact event, and at the same time, the overall signal chain must be optimized. Large dynamic range ADCs with high resolution (at least 12-bit) are generally required for processing these signals to retrieve the DToA information found in the full signal spectrum, typically from 20 kHz to 500 kHz. A solution explored in this work is the design of a versatile analog front-end capable of matching the different types of piezoelectric sensors used for impact monitoring (piezoceramic, piezocomposite or piezopolymer) in a sensor node. The analog front-end interface has a programmable attenuator and three selectable configurations with different gain and bandwidth to optimize the signal-to-noise ratio and distortion of the selected Lamb wave mode. This interface is realized as a module compatible with the I/O of a 16 channels real-time electronic system for SHM previously developed by the authors. High-frequency components up to 270 kHz and lower-frequency components of the received signals are separated by different channels and generate high signal-to-noise ratio signals that can be easily treated by digital signal processing using a single central unit board with ADC and FPGA.

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Thèses sur le sujet "Piezopolymer sensor"

MERLO, Eugenio MARINO. « Metodi di analisi passiva mediante sensori piezoelettrici in sistemi di monitoraggio strutturale e sviluppo di algoritmi per la localizzazione di impatti. (Passive analysis methods using piezoelectric sensors in structural monitoring systems and development of algorithms for the localization of impacts.) ». Doctoral thesis, 2019. http://hdl.handle.net/2158/1153042.

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Technique for Impact Localization on Carbon Fiber Laminate Sheets: il problema affrontato è stato quello della localizzazione di un impatto a bassa energia (simulati con sfere in caduta libera) su strutture planari in materiale polimerico rinforzato con fibra di carbonio (CFRP) per mezzo della formula di triangolazione di Tobias sviluppando un nuovo algoritmo “di verosimiglianza” per l’estrazione del tempo di arrivo differenziale (DToA) da una coppia di sensori piezoelettrici flessibili incollati alla superficie del materiale. In particolare, è stata fatta la caratterizzazione della lastra in CFRP in termini di diagramma delle velocità di propagazione delle onde di Lamb. L’algoritmo ha reso indipendente la valutazione del DToA dal tipo di trasduttore utilizzato, ha migliorato la stima l’accuratezza delle coordinate di impatto. I parametri da inserire nel sistema di elaborazione sono minimi e sono stati migliorati i tempi di elaborazione. Sono state sviluppate nuove geometrie per i sensori in PVDF. Infine, è stato popolato un data base con i segnali acquisiti ed estratti dati statistici con i quali è stato possibile valutare l’algoritmo e confrontarlo con il metodo classico a soglia fissa per lastre in CFRP. Analysis of the errors in the estimation of impact positions in plate-like structure through the triangulation formula: l’attività di ricerca si è svolta concentrandosi sullo studio di una sperimentazione che diminuisse i parametri di incertezza. È stata condotta quindi un’analisi degli errori nella stima della posizione di impatto su alluminio attraverso la formula di triangolazione. Inizialmente, al fine di ridurre l’incertezza sulla generazione degli impatti con sfere in caduta libera, è stato realizzato un sistema meccanico, completo di elettronica di pilotaggio, per la generazione di impatti controllati e ripetibili. Il lavoro si è concentrato su una semplice procedura di laboratorio basata su un set-up con una coppia di sensori posizionati simmetricamente rispetto al punto di impatto, per stimare l'incertezza del DToA e la velocità di propagazione. Successivamente dallo studio del modello matematico di triangolazione sono stati individuati ed indagati, in modo simulato, i due fattori che ne influiscono sulla stima: il tempo differenziale di arrivo (DToA) ad ogni coppia di sensori dell’array e l’incertezza sulla stima della velocità di gruppo delle onde guidate di Lamb. Le prove sperimentali per la misura della velocità delle onde di Lamb e per la stima del DToA, sono state fatte su di una lastra di alluminio di spessore 1.4 mm con sensori piezoelettrici commerciali. Poiché l'errore per la stima DToA dipende anche dal tipo di elaborazione del segnale adottato, tra i molti metodi riportati in letteratura per la stima del DToA, abbiamo analizzato e confrontato tre metodi: l'attraversamento di una soglia predeterminata, il metodo di correlazione e l’algoritmo di “verosimiglianza” sviluppato in [A1]. Per il rilevamento dell'incertezza della velocità di propagazione, sono state calcolate le curve di dispersione della piastra di alluminio ed i risultati sono stati poi confrontati con le misurazioni sperimentali. Inoltre, un'analisi teorica ha mostrato come gli errori che influenzano il DToA e la velocità di propagazione agiscano sulla stima del punto di impatto nella formula di triangolazione. L'analisi dell'errore di posizionamento, nell’ottica di un utilizzo di configurazione multisensoriale, è considerata utile per la progettazione di un sistema di monitoraggio strutturale (SHM).

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Chapitres de livres sur le sujet "Piezopolymer sensor"

Wang, Feng, Mami Tanaka et Seiji Chonan. « Development of a PVDF Piezopolymer Sensor for Unconstrained In-Sleep Cardiorespiratory Monitoring ». Dans Twelfth International Conference on Adaptive Structures and Technologies, 298–307. CRC Press, 2017. http://dx.doi.org/10.1201/9781315121338-27.

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Actes de conférences sur le sujet "Piezopolymer sensor"

Pietrzakowski, Marek. « Vibration Reduction of Laminated Plates With Various Piezoelectric Functionally Graded Actuators ». Dans ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59271.

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The aim of the present study is to develop models of active laminated plates containing monolithic piezopolymer sensor layers and a new type of actuator layers made of Piezoelectric Functionally Graded (PFG) material, which is a mixture of piezoceramics and polymer or epoxy matrix. The electromechanical properties of the PFG layers can be tailored varying continuously the piezoceramic volume fraction across the thickness during the manufacturing process. The analysis and numerical simulations are focused on the relationship between the material compositional gradient and electromechanical properties and also dynamic responses of the structure obtained. Three types of functions, which describe the volume fraction distribution of constituents, are considered: exponential, parabolic and sigmoid. The effective properties of the PFG material, i.e. the Young’s modulus and piezoelectric coefficient gradations, are determined using to the rule of mixtures. A constant velocity feedback algorithm is used for the active damping of transverse plate vibration. The dynamic analysis concerns steady-state behavior of rectangular symmetrically laminated plates and is based on hypothesis of the classical plate theory. The numerical simulations are performed to recognize the influence of the applied pattern of the piezoceramic fraction distribution and its parameters on the gradient of elastic and piezoelectric properties within the PFG actuators and, as the final result, the active plate structural response presented in terms of amplitude-frequency characteristics. The changes in both the natural frequencies and resonant amplitudes are compared and the influence of the piezoceramic gradation on the control system operational effectiveness is also indicated and discussed.

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CHRYSOCHOIDIS, NIKOLAOS, EUGENIO GUTIERREZ et GRAZIANO RENALDI. « Evaluation of the Performance of an Energy Harvesting Chain Based on Piezopolymer Sensors ». Dans Structural Health Monitoring 2015. Destech Publications, 2015. http://dx.doi.org/10.12783/shm2015/122.

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Lin, Bin, et Victor Giurgiutiu. « PVDF and PZT Piezoelectric Wafer Active Sensors for Structural Health Monitoring ». Dans ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80400.

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Piezoelectric wafer active sensors (PWAS) used in structural health monitoring (SHM) applications are able to detect structural damage using Lamb waves. PWAS are small, lightweight, unobtrusive and inexpensive. PWAS achieve direct transduction between electric and elastic wave energies. PWAS are essential elements in the Lamb-wave SHM with pitch-catch, pulse-echo, phased array system and electromechanical impedance methods. PWAS are charge mode sensors and they can be used as both transmitters and receivers. A model of PWAS is shown in this paper. In vibration, impact detections applications, the PWAS response is strong due to the large dynamic change of strain. In pitch-catch, pulse-echo and phased array applications, PWAS are used to generate and receive Lamb waves and the PWAS response is small. A charge amplifier for PWAS applications is introduced in this paper. PWAS are normally made of piezoceramic Lead Zirconate Titanate (PZT). The structural integrity tests require attachment of PWAS to the material surface and there are critical applications where the rigid piezoceramic wafers cannot conform to curved surfaces. As alternative one can use flexible piezopolymer such as polyvinylidene fluoride (PVDF); such PVDF-PWAS have been studied in this paper. PVDF-PWAS were mounted on a cantilever beam for the free vibration test and on a long rod for the longitudinal impact test. The experimental results of the PZT-PWAS and PVDF-PWAS have been compared with the conventional strain gauge. The theoretical and experimental results in this study gave the basic demonstration of the piezoelectricity of PZT-PWAS and PVDF-PWAS.

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