Bibliografie tematiche / 3D vibrometry

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Letteratura scientifica selezionata sul tema "3D vibrometry"

Autore: Grafiati

Pubblicato: 9 novembre 2024

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Articoli di riviste sul tema "3D vibrometry"

Breaban, Florin, Roger Debuchy e Didier Defer. "Laser Scanning Vibrometry and Holographic Interferometry Applied to Vibration Study". Applied Mechanics and Materials 801 (ottobre 2015): 303–11. http://dx.doi.org/10.4028/www.scientific.net/amm.801.303.

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The applications of high performance materials in the aerospace and in the automotive technology in the next years need to develop new vibration study, nondestructive testing, predictive maintenance and industrial control methods.The Laser Scanning Vibrometry and Holographic Interferometry methods of vibration study and nondestructive testing by modal analysis are described. The Laser Scanning Vibrometer PSV 400 is made by Polytec GmbH and the PSV software reconstructs the 3D model of the measured micro-deformation of the object. The holographic laser system HLS-3 from Lumonics Inc. has 100 MW ruby laser peak power and 30 ns pulse width.Using mechanical excitation to induce a measurable vibration, the Laser Scanning Vibrometry and Holographic Interferometry modal analysis measurements show up the vibrational signatures and the damaged areas of the objects made by high performance materials - polymers, composites.

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Orta, Adil Han, Mathias Kersemans e Koen Van Den Abeele. "On the Identification of Orthotropic Elastic Stiffness Using 3D Guided Wavefield Data". Sensors 22, n. 14 (15 luglio 2022): 5314. http://dx.doi.org/10.3390/s22145314.

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Scanning laser Doppler vibrometry is a widely adopted method to measure the full-field out-of-plane vibrational response of materials in view of detecting defects or estimating stiffness parameters. Recent technological developments have led to performant 3D scanning laser Doppler vibrometers, which give access to both out-of-plane and in-plane vibrational velocity components. In the present study, the effect of using (i) the in-plane component; (ii) the out-of-plane component; and (iii) both the in-plane and out-of-plane components of the recorded vibration velocity on the inverse determination of the stiffness parameters is studied. Input data were gathered from a series of numerical simulations using a finite element model (COMSOL), as well as from broadband experimental measurements by means of a 3D infrared scanning laser Doppler vibrometer. Various materials were studied, including carbon epoxy composite and wood materials. The full-field vibrational velocity response is converted to the frequency-wavenumber domain by means of Fourier transform, from which complex wavenumbers are extracted using the matrix pencil decomposition method. To infer the orthotropic elastic stiffness tensor, an inversion procedure is developed by coupling the semi-analytical finite element (SAFE) as a forward method to the particle swarm optimizer. It is shown that accounting for the in-plane velocity component leads to a more accurate and robust determination of the orthotropic elastic stiffness parameters.

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Parikesit, Gea O. F., e Indraswari Kusumaningtyas. "How to use 3D shadows for simple microscopy and vibrometry". Physics Education 52, n. 4 (13 giugno 2017): 045026. http://dx.doi.org/10.1088/1361-6552/aa74aa.

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Grigg, S., M. Pearson, R. Marks, C. Featherston e R. Pullin. "Assessment of Damage Detection in Composite Structures Using 3D Vibrometry". Journal of Physics: Conference Series 628 (9 luglio 2015): 012101. http://dx.doi.org/10.1088/1742-6596/628/1/012101.

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Weekes, Ben, e David Ewins. "Multi-frequency, 3D ODS measurement by continuous scan laser Doppler vibrometry". Mechanical Systems and Signal Processing 58-59 (giugno 2015): 325–39. http://dx.doi.org/10.1016/j.ymssp.2014.12.022.

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Marks, Ryan, Clare Gillam, Alastair Clarke, Joe Armstrong e Rhys Pullin. "Damage detection in a composite wind turbine blade using 3D scanning laser vibrometry". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, n. 16 (6 dicembre 2016): 3024–41. http://dx.doi.org/10.1177/0954406216679612.

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As worldwide wind energy generation capacity grows, there is an increasing demand to ensure structural integrity of the turbine blades to maintain efficient and safe energy generation. Currently, traditional non-destructive testing methods and visual inspections are employed which require the turbine to be out-of-operation during the inspection periods, resulting in costly and lengthy downtime. This study experimentally investigates the potential for using Lamb waves to monitor the structural integrity of a composite wind turbine blade that has been subject to an impact representative of damage which occurs in service. 3D scanning laser vibrometry was used to measure Lamb waves excited at three different frequencies both prior to, and after, impact to identify settings for an optimal system. Signal processing techniques were applied to the datasets to successfully locate the damage and highlight regions on the structure where the Lamb wave was significantly influenced by the presence of the impact damage. Damage size resulting from the impact was found to correlate well with the laser vibrometry results. The study concluded that acousto-ultrasonic-based structural health monitoring systems have great potential for monitoring the structural integrity of wind turbine blades.

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Sokołowski, Jacek, Adam Orłowski, Robert Bartoszewicz, Magdalena Lachowska, Alicja Gosiewska, Przemyslaw Biecek e Kazimierz Niemczyk. "Quantitative analysis of 3D-printed custom ossicular prostheses motion using laser Doppler vibrometry". Otolaryngologia Polska 77, n. 6 (29 febbraio 2024): 23–30. http://dx.doi.org/10.5604/01.3001.0053.9038.

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Introduction: In chronic otitis media, the reconstruction of the middle ear's sound conducting system involves repairing the tympanic membrane and filling the space between ossicular chain remnants. The final shape of the prosthesis is usually determined intraoperatively. However, the ossicular chain may be preoperatively measured using computed tomography (CT) scans, and an individualized prosthesis can be designed. Custom 3D printing seems to be an attractive solution for optimal adjustment. Aim: Our study aimed to assess the 3D-printed custom prosthesis movability and compare it to the original ossicular chain. Material and methods: Five fresh-frozen temporal bone specimens were used. Using Cone-Beam CT scans, the incus model was designed individually and 3D-printed. The ossicular chain was reconstructed inside the cadaveric temporal bone. Acoustic stimuli were applied to the external ear canal one frequency at a time. The laser Doppler vibrometer (LDV) measured the intact and 3D-printed prosthesis reconstructed ossicular chain vibrations. Results: At all stimulation frequencies, there was no significant difference in velocity values between the intact and reconstructed ossicular chain at the intensity of 80 dB SPL. The obtained values of the velocity gain were: −7.9 (SD-19) dB, −6.8 (SD8.12) dB, −10,9 (SD-5.3) dB, −7.4 (SD-8.16) dB for 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, respectively. The vibration threshold shift values ranged between –0.57 dB at 500 Hz and 3.81 dB at 2000 Hz. Conclusions: This study analyzed the movability of individualized 3D-printed custom ossicular prostheses using LDV. Compared to the intact ossicular chain, the reconstructed ossicular chain movability was characterized by statistically insignificant reduced movability at all tested frequencies. Because the prosthesis's new design conception as custom 3D individualized printing allows for patient-specific ossiculoplasty, it represents a promising new direction for ossicular chain reconstruction. It seems to be an attractive solution for prosthesis optimal adjustment and, hopefully, better hearing results.

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Derusova, Daria A., Vladimir P. Vavilov, Nikolay V. Druzhinin, Victor Y. Shpil’noi e Alexey N. Pestryakov. "Detecting Defects in Composite Polymers by Using 3D Scanning Laser Doppler Vibrometry". Materials 15, n. 20 (14 ottobre 2022): 7176. http://dx.doi.org/10.3390/ma15207176.

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The technique of 3D scanning laser Doppler vibrometry has recently appeared as a promising tool of nondestructive evaluation of discontinuity-like defects in composite polymers. The use of the phenomenon of local defect resonance (LDR) allows intensifying vibrations in defect zones, which can reliably be detected by means of laser vibrometry. The resonance acoustic stimulation of structural defects in materials causes compression/tension deformations, which are essentially lower than the material tensile strength, thus proving a nondestructive character of the LDR technique. In this study, the propagation of elastic waves in composites and their interaction with structural inhomogeneities were analyzed by performing 3D scanning of vibrations in Fast Fourier Transform mode. At each scanning point, the in-plane (x, y) and out of plane (z) vibration components were analyzed. The acoustic stimulation was fulfilled by generating a frequency-modulated harmonic signal in the range from 50 Hz to 100 kHz. In the case of a reference plate with a flat bottom hole, the resonance frequencies for all (x, y, and z) components were identical. In the case of impact damage in a carbon fiber reinforced plastic sample, the predominant contribution into total vibrations was provided by compression/tension deformations (x, y vibration component) to compare with vibrations by the z coordinate. In general, inspection results were enhanced by analyzing total vibration patterns obtained by averaging results at some resonance frequencies.

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Marks, Ryan, Alastair Clarke, Carol Featherston, Christophe Paget e Rhys Pullin. "Lamb Wave Interaction with Adhesively Bonded Stiffeners and Disbonds Using 3D Vibrometry". Applied Sciences 6, n. 1 (7 gennaio 2016): 12. http://dx.doi.org/10.3390/app6010012.

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Crua, Cyril, e Morgan R. Heikal. "Time-resolved fuel injector flow characterisation based on 3D laser Doppler vibrometry". Measurement Science and Technology 25, n. 12 (29 ottobre 2014): 125301. http://dx.doi.org/10.1088/0957-0233/25/12/125301.

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Più fonti

Tesi sul tema "3D vibrometry"

Bouzzit, Aziz. "Ellipsométrie acoustique pour le suivi et la caractérisation de matériaux complexes". Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1304.

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Les matériaux complexes sont aujourd'hui au cœur des enjeux sociétaux majeurs dans la plupart des grands domaines tels que l'énergie, le transport, l'environnement, la conservation/restauration du patrimoine, la santé ou la sécurité. En effet, de par les opportunités d'innovation offertes en matière de fonctionnalités, ces matériaux suscitent de nouvelles problématiques d'analyse et de compréhension multi-physiques et multi-échelles. Il en va de même pour l'instrumentation nécessaire à leur caractérisation.Répandues dans le domaine de la caractérisation non destructive des milieux complexes, les méthodes acoustiques utilisent les propriétés de propagation des ondes mécaniques dans ces matériaux pouvant être hétérogènes et anisotropes.Dans une approche multi-échelle, l'intérêt des méthodes ultrasonores est d'être particulièrement sensibles à leurs propriétés mécaniques, telles que l'élasticité, la rigidité et la viscosité. La nature hétérogène et multiphasique d'un milieu complexe conduit ainsi à la notion de milieu viscoélastique, caractérisé par les coefficients de Lamé généralisés complexes (��∗, ��∗) et leur variation en fonction de la fréquence.L'objectif de cette thèse est de développer une méthode de caractérisation de ces matériaux complexes viscoélastiques qui permette de mesurer simultanément la variation des deux coefficients de Lamé généralisés complexes (��∗, ��∗) en fonction de la fréquence. L'approche proposée est de suivre, dans l'espace et dans le temps, la propagation de l'onde de Rayleigh et d'extraire ses paramètres ellipsométriques (ellipticité χ et orientation θ) en complément des paramètres propagatifs (k' et k'') classiquement déterminés. Basée sur la détection de l'onde par vibrométrie laser 3D à la surface du matériau complexe, et au moyen de l'analyse de Gabor 2D dans l'espace des Quaternions, l'estimation de l'ensemble des paramètres - propagatifs et ellipsométriques - donne accès à la caractérisation complète du milieu avec cette seule onde de Rayleigh.Les développements théoriques proposés dans ce travail, ainsi que les résultats expérimentaux et issus de simulation, confirment l'intérêt de l'ellipsométrie acoustique pour la caractérisation de ces matériaux complexes
Complex materials are at the heart of major societal challenges in most major fields such as energy, transport, environment, heritage conservation/restoration, health and safety. Because of the opportunities for innovation offered in terms of features, these materials are giving rise to new problems of multi-physical and multi-scale analysis and understanding. The same applies to the instrumentation needed to characterize them.Acoustic methods, which are widely used in the non-destructive characterization of complex media, make use of the propagation properties of mechanical waves in these materials, which can be heterogeneous and anisotropic.In a multi-scale approach, the advantage of ultrasonic methods is that they are particularly sensitive to mechanical properties such as elasticity, rigidity and viscosity. The heterogeneous and multiphase nature of a complex medium thus leads to the notion of a viscoelastic medium, characterized by generalized complex Lamé coefficients (��∗, ��∗) and their variation as a function of frequency.The objective of this thesis is to develop a method for characterizing these complex viscoelastic materials that simultaneously measures the variation of the two generalized complex Lamé coefficients (��∗, ��∗) versus the frequency. The proposed approach is to follow, in space and in time, the propagation of the Rayleigh wave and to extract its ellipsometric parameters (ellipticity χ and orientation θ) in addition to the propagation parameters (k' and k'') conventionally determined. Based on the wave detection by 3D laser vibrometry at the surface of the complex material, and by means of 2D Gabor analysis in Quaternion space, the estimation of propagation and ellipsometric parameters gives access to the complete characterization of the complex material only by studying the interaction of a Rayleigh wave with the medium.The theoretical developments proposed in this work, together with experimental and simulation results, confirm the value of acoustic ellipsometry for characterizing these complex materials

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Chia, Gomez Laura Piedad. "Elaboration et caractérisation de matériaux fonctionnels pour la stereolithographie biphotonique". Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH9153.

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La stéréolithographie biphotonique (TPS) est une technique de microfabrication 3D basée sur la polymérisation par absorption biphotonique qui permet d’obtenir en une seule étape des structures 3D complexes avec des détails sub-100nm. Aujourd’hui, en raison des conditions spécifiques de fabrication liées à la TPS (fort flux, confinement spatial de la photoréaction,…), un des enjeux concerne le développement de matériaux fonctionnels compatibles avec ce procédé. Dans ce contexte, l’objectif de cette thèse a été de développer de nouveaux matériaux fonctionnels à base de polymères à empreintes moléculaires (MIP) pour élaborer des capteurs chimiques. Une première partie de ce travail a consisté à mettre en place différentes méthodes dédiées à la caractérisation des propriétés géométriques, chimiques et mécaniques des matériaux élaborés par TPS. Par exemple, la vibrométrie laser a été utilisée pour la première fois afin de sonder de façon non-invasive les propriétés mécaniques de microstructures réalisées par TPS. Dans un second temps, ce travail a été mis à profit pour étudier l’impact du processus de fabrication (i.e. conditions photoniques) ainsi que des paramètres physico-chimiques affectant la photoréaction (i.e. inhibition par oxygène et nature du monomère) sur les propriétés finales des matériaux. Enfin, en s’appuyant sur les résultats obtenus, des microcapteurs chimiques à base de MIP, à lecture optique ou mécanique, ont été fabriqués. Leurs propriétés de reconnaissance moléculaire, ainsi que leurs sélectivités ont été démontrées pour une molécule cible modèle (D-L-Phe)
The two-photon stereolithography (TPS) technique is a micro-nanofabrication method based on photopolymerization by two-photon absorption that allows in a single manufacturing step to obtain complex 3D structures with high-resolution details (sub-100nm). Due to the specific conditions of TPS process (intense photon flux, spatial confinement of the photoreaction…) one of the main concerns today is the development of functional materials compatible with the TPS. According to the aforementioned, the general objective of this thesis was to develop new functional materials based on molecularly imprinted polymers (MIP) to elaborate chemical microsensors. In the first step of this work, different methods were implemented to characterize the geometrical, chemical and mechanical properties of the materials synthesized by TPS. For example, laser-Doppler vibrometry was used for first time to evaluate the mechanical properties of microstructures fabricated by TPS in a non-invasive way. In the second step, the characterization methodology was used to study the impact of the manufacturing process (i.e. photonic conditions) and the physicochemical parameters that affect the photoreaction (i.e. oxygen inhibition and the nature of the monomer) and the final properties of the materials. Finally, the obtained results enabled the prototyping of chemical microsensors based on MIP. Their molecular recognition properties and their selectivity were demonstrated for the molecule (D-L-Phe) by an optical and a mechanical sensing method

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Langston, Paul Wesley. "Implementation and evaluation of a two-dimensional laser doppler vibrometer system for non-contact monitoring of external stress loading of aluminum samples". Thesis, Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33808.

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This thesis details the development and validation of a laser Doppler vibrometer-based measurement system that is capable of quantifying not only the normal vibration of a solid body but also the component of vibration that is parallel to the plane containing the surface of interest. LDV manufacturers produce various devices that capture 3D measurements in a beam configuration that can be used to decompose the measured signals into not only the normal velocity of the surface of an object but also two orthogonal in-plane components of the vibration. It was a slightly simplified two-dimensional version of this approach that was chosen for implementation in the Wave Physics Lab using individual components to create a cheaper, more flexible system than those produced by companies such as Polytec. The goal of this system is to facilitate the exploration and discovery of areas and applications where 2D measurement may provide a more complete and precise view of the physics of different phenomena. Upon completion of the system development and validation, a study was done that sought to measure the acoustoelastic effect in an Aluminum plate by measuring how increasing loads alter both the normal and in-plane components of Lamb wave propagation in the plate. The acoustoelastic effect is the effect of stress on wave speed caused by non-linearity in the propagation medium.

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Aryan, Pouria. "A method for compensation of changing environmental and operational conditions for structural health monitoring using guided waves". Thesis, 2016. http://hdl.handle.net/2440/101789.

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Structural health monitoring (SHM) systems using guided waves permit the detection of structural damage via a network of permanently attached or embedded sensors. The benefits of such systems in terms of the reduction of maintenance and operation costs across many industries are now widely recognised. To identify the presence of damage, the amplitude of residual wave signals remaining after the subtraction of the reference data is often utilised in damage diagnostics. However, even in the absence of structural damage, these residual signals are usually not non-zero because of changing environmental or operational conditions (EOCs). Therefore, some form of compensation for variable EOCs is absolutely essential for guided wave based SHM methods reliant on baseline subtraction, to work accurately in real-world applications. Many studies have demonstrated that the effect of changing EOCs can mask damage to such a degree that a critical defect might not be detected. Several effective strategies, based on signal processing, have been developed in recent years, specifically in order to compensate for ambient temperature variations. Nevertheless, many other factors and conditions, such as a progressive failure of the actuator and the adhesive bonding layer, changing humidity and boundary conditions or degradation of material properties, cannot be identified or compensated for with the existing strategies and techniques. This research describes a conceptually new method, which is capable of reconstructing the baseline time traces corresponding to the current state of the structure and EOCs. Thus, there is no need for any other compensation for EOCs when using this method for damage diagnosis. The method is based on 3D surface measurements of the velocity field near the actuator, using laser vibrometry in conjunction with high-fidelity finite element simulations of guided wave propagations in the defect-free structures. To demonstrate the feasibility and efficiency of the proposed method, the thesis provides several examples of the reconstruction of named baseline time traces and damage detection in isotropic and composite structural components. It is recognised that the utilisation of 3D laser measurement systems and transient FE simulations can significantly increase the cost of the damage detection if this method is to be employed in practice. However, it is believed that with the advances in computer and laser technologies the cost-efficiency can be significantly improved and, in the future, the method will be applied in a wide range of engineering applications. It should be highlighted that for the current thesis the concept and idea have been verified through comprehensive numerical and experimental studies and this is a fundamental step in the development of this innovative method. As a result, this thesis is largely focused on the feasibility, quantifiable proof of the conceptualisations underpinning the thesis and demonstrations of the potential of this new development in engineering applications.
Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2016.

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Capitoli di libri sul tema "3D vibrometry"

Tilmann, Samuel. "Full Field Strain Measurements Using 3D Laser Vibrometry". In Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6, 105–12. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12935-4_12.

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Macknelly, D. J., e P. R. Ind. "Component Qualification Using 3D Laser Vibrometry and Transmissibility Models". In Experimental Techniques, Rotating Machinery, and Acoustics, Volume 8, 181–87. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15236-3_17.

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Tatar, Kourosh, Erik Olsson e Fredrik Forsberg. "Tomographic Reconstruction of 3D Ultrasound Fields Measured Using Laser Vibrometry". In Experimental Analysis of Nano and Engineering Materials and Structures, 337–38. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_167.

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Renaud, Franck, Stefania Lo Feudo e Jean-Luc Dion. "Measuring 3D Vibrations Amplitude with a Single Camera and a Model of the Vibrating Structure". In Computer Vision & Laser Vibrometry, Volume 6, 63–68. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-34910-2_8.

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Alkady, Khalid, Christine E. Wittich e Richard L. Wood. "A Novel Framework for the Dynamic Characterization of Civil Structures Using 3D Terrestrial Laser Scanners". In Computer Vision & Laser Vibrometry, Volume 6, 91–95. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-34910-2_11.

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Witt, Bryan, e Brandon Zwink. "Pushing 3D Scanning Laser Doppler Vibrometry to Capture Time Varying Dynamic Characteristics". In Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7, 111–21. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74693-7_11.

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Mallareddy, Tarun Teja, Daniel J. Alarcón, Sarah Schneider e Peter G. Blaschke. "The Influence of Geometrical Correlation in Modal Validation Using Automated 3D Metrology". In Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7, 239–44. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74693-7_23.

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Chen, Da-Ming, e W. D. Zhu. "Rapid and Dense 3D Vibration Measurement by Three Continuously Scanning Laser Doppler Vibrometers". In Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7, 19–29. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74693-7_3.

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Yuan, Ke, e Weidong Zhu. "Modal Identification of a Turbine Blade with a Curved Surface Under Random Excitation by a 3D CSLDV System and the Extended Demodulation Method". In Computer Vision & Laser Vibrometry, Volume 6, 127–39. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-34910-2_16.

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Rohe, Daniel P. "Strategies for Testing Large Aerospace Structures with 3D SLDV". In Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8, 1–12. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54648-3_1.

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Atti di convegni sul tema "3D vibrometry"

Taylor, Rayanne, e Jinki Kim. "Monitoring Volumetric Defects in 3D Bioprinting Using Video-Based Vibrometry". In ASME 2023 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/smasis2023-117601.

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Abstract Additive manufacturing technologies have the potential to revolutionize the manufacturing industry by making it easier to fabricate complex structures, high value, and low volume parts in various contexts. Bio-additive manufacturing is particularly promising, as it has enabled the 3D printing of human organs. Researchers have made progress by developing novel materials and printing strategies for additively manufacturing complicated mission-critical geometries. On the other hand, assessing the structural integrity of these bio-printed structures has been challenging, as destructive contact-based approaches may interfere with the manufacturing process and affect the original dynamics and quality of the bio-prints, due to the relatively soft and lightweight nature of bio-prints. Furthermore, the repeatability of measurement is significantly dependent on the quality of how the sensor is attached to the part. Non-contact methods, such as laser and X-ray based techniques, can provide measurements without adding mass to the part. However, lasers may produce inaccuracies due to reflection and absorption in translucent materials, which are often found in bio-constructs. Although there have been significant advances in non-contact methods for reliably identifying damages in bio-printed structures, particularly embedded defects, implementing these approaches in a straightforward way has been challenging. To advance the state-of-the-art, this study proposes a novel method that can reliably assess the damage properties without contact by using video-based vibrometry. Vibration signals can provide a comprehensive response of the target structure, including material properties and geometry changes due to embedded defects in bioprinting. By analyzing the phase shift of the pixel intensity in the video, the vibration characteristics that indicate surface and/or embedded defects can be assessed for the entire structure captured in the camera angle, without the need for multiple sensors to be installed on the structure. This research focuses on analyzing the vibration characteristics of a cube that was manufactured by an extrusion-based bio-printer with pneumatic dispensing using sodium alginate based bioink. A high-speed camera and phase-based motion estimation technique are used to obtain experimental data on the vibration characteristics of the cube. Volumetric defects introduced by extrusion pressure irregularity and scaffolds with voids and their severities are identified by monitoring the vibration characteristics. These findings suggest that the proposed method could be utilized to effectively verify the structural integrity of additively manufactured organs during fabrication, which could enhance process optimization and operation safety. Future works include incorporating finite element model to compare its response characteristics for healthy and damaged models with the experimentally obtained results and identifying the detection sensitivity and limit with respect to parameters such as damage type and location.

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Swenson, Eric D., Hoon Sohn, Steven E. Olson e Martin P. Desimio. "A comparison of 1D and 3D laser vibrometry measurements of Lamb waves". In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, a cura di Tribikram Kundu. SPIE, 2010. http://dx.doi.org/10.1117/12.847362.

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Olsson, Erik, e Mikael Sjödahl. "3D Selective Imaging of Sound Sources in Air from 1D Laser Vibrometry Measurements". In Digital Holography and Three-Dimensional Imaging. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/dh.2009.jtub6.

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Weekes, B., D. Ewins e F. Acciavatti. "Continuous-scanning laser Doppler vibrometry: Extensions to arbitrary areas, multi-frequency and 3D capture". In 11TH INTERNATIONAL CONFERENCE ON VIBRATION MEASUREMENTS BY LASER AND NONCONTACT TECHNIQUES - AIVELA 2014: Advances and Applications. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4879604.

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Bouzzit, A., A. Arciniegas, L. Martinez, S. Serfaty e N. Wilkie-Chancellier. "Ultrasonic surface wave parameters monitoring using 3D vibrometry and ellipsometry for local material characterization". In 10th Convention of the European Acoustics Association Forum Acusticum 2023. Turin, Italy: European Acoustics Association, 2022. http://dx.doi.org/10.61782/fa.2023.0815.

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Barnoncel, David, Wieslaw J. Staszewski, Jochen Schell e Patrick Peres. "Damage detection in reusable launch vehicle components using guided ultrasonic waves and 3D laser vibrometry". In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, a cura di Tribikram Kundu. SPIE, 2013. http://dx.doi.org/10.1117/12.2009846.

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Pedrini, Giancarlo, Staffan Schedin e Hans J. Tiziani. "Combination of pulsed digital holography and laser vibrometry for the 3D measurements of vibrating objects". In 4th International Conference on Vibration Measurement by Laser Techniques, a cura di Enrico P. Tomasini. SPIE, 2000. http://dx.doi.org/10.1117/12.386721.

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Schubert, L., M. Barth, T. Klesse, B. Köhler e B. Frankenstein. "Guided elastic waves and their impact interaction in CFRP structures characterized by 3D laser scanning vibrometry". In The 15th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, a cura di Tribikram Kundu. SPIE, 2008. http://dx.doi.org/10.1117/12.777510.

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Hebaz, S. E., F. Agon, A. Bouzzit, H. Walaszek, R. Hodé, F. Zhang, S. Serfaty e N. Wilkie-Chancellier. "Longitudinal critically refracted wave for residual stress assessment on a welded plate using 3D laser vibrometry". In 10th Convention of the European Acoustics Association Forum Acusticum 2023. Turin, Italy: European Acoustics Association, 2022. http://dx.doi.org/10.61782/fa.2023.1009.

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Ayers, J., C. T. Owens, K. C. Liu, E. Swenson, A. Ghoshal e V. Weiss. "Guided wave-based J-integral estimation for dynamic stress intensity factors using 3D scanning laser Doppler vibrometry". In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: VOLUME 32. AIP, 2013. http://dx.doi.org/10.1063/1.4789030.

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Rapporti di organizzazioni sul tema "3D vibrometry"

Rohe, Daniel Peter. Documentation and Instructions for Running Two Python Scripts that Aid in Setting up 3D Measurements using the Polytec 3D Scanning Laser Doppler Vibrometer. Office of Scientific and Technical Information (OSTI), agosto 2015. http://dx.doi.org/10.2172/1213303.

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Blecke, Jill, e Daniel Peter Rohe. NMSBA High Frequency Modal Analysis of a Solid Metal Cylinder using a Polytec 3D Scanning Laser Vibrometer. Office of Scientific and Technical Information (OSTI), giugno 2015. http://dx.doi.org/10.2172/1183948.

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