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Gotowa bibliografia na temat „Vibro-acoustic Wave”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 7 września 2023

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Artykuły w czasopismach na temat "Vibro-acoustic Wave"

Zhao, Nan, Linsheng Huo i Gangbing Song. "A nonlinear ultrasonic method for real-time bolt looseness monitoring using PZT transducer–enabled vibro-acoustic modulation". Journal of Intelligent Material Systems and Structures 31, nr 3 (4.12.2019): 364–76. http://dx.doi.org/10.1177/1045389x19891534.

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A real-time nonlinear ultrasonic method based on vibro-acoustic modulation is applied to monitor early bolt looseness quantitatively by using piezoceramic transducers. In addition to the ability to detect the early bolt looseness, a major contribution is that we replaced the shaker, which is commonly used in a vibro-acoustic modulation method, by a permanently installed and low-cost lead zirconate titanate patch. In vibro-acoustic modulation, when stimulating two input waves with distinctive frequencies, namely the high-frequency probing wave and the low-frequency pumping wave, the high-frequency probing wave will be modulated by the low-frequency pumping wave to generate sidebands in terms of bolt looseness. Thus, the influence of low-frequency voltage amplitudes on the modulation results, which is ambiguous in previous research, is also analyzed in this article. The results of experiment demonstrated that the lead zirconate titanate–enabled vibro-acoustic modulation method is reliable and easy to implement to identify the bolt looseness continuously and quantitatively. In addition, low-frequency amplitudes of actuating voltage should be selected in a reasonable range. Finally, we compared the vibro-acoustic modulation method with the time-reversal method based on the linear ultrasonic theory, and the result illustrates that vibro-acoustic modulation method has better performance in monitoring the early bolt looseness.

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Tebyanian, Afshin, i Mohammad Reza Ghazavi. "Vibro-acoustic and sound transmission loss analysis of truncated conical shell subjected to incident sound wave". Journal of Vibration and Control 25, nr 2 (29.06.2018): 435–44. http://dx.doi.org/10.1177/1077546318783553.

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A combination of analytical method for shell vibration, boundary element method (BEM) for acoustic media of shell outer space, and finite element method (FEM) for shell inner space was used to study the vibro-acoustic behavior and extract sound transmission loss factor (STL) of a coupled vibro-acoustic system. The equation of motion of the shell is extracted based on the Donnell–Mushtari hypothesis and using Hamilton principles. The acoustic pressure on the outer and inner space is obtained using BEM on the defined nodes on the surface and these localized nodal pressures are converted to nodal concentrated forces. Finally, vibration of the coupled vibro-acoustic model is solved in frequency domain and vibration response of shell and acoustic pressure at any point in the media (outer, on the surface, and inner of shell) are obtained. Also, the STL of the shell is extracted based on the ratio of total acoustic energy received by the shell to that transferred to inner space.

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Włodarska, Dorota, Andrzej Klepka, Wieslaw Jerzy Staszewski i Tadeusz Uhl. "Comparative Study of Instantaneous Frequency Extraction in Nonlinear Acoustics Used for Structural Damage Detection". Key Engineering Materials 588 (październik 2013): 33–42. http://dx.doi.org/10.4028/www.scientific.net/kem.588.33.

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Nonlinear acoustics deals with various nonlinear effects that occur in ultrasonic wave propagation. The method is suitable for material characterisation, as it uses different nonlinear phenomena associated with material imperfections. The method has been used for detecting nonlinearities in cracked solids by: measuring distortions of acoustic signals, estimating resonance frequency shifts or assessing nonlinear vibro-acosutic modulations. The latter is the most widely used non-classical approach to probe material nonlinearities. The method involves vibro-acoustic interactions of ultrasonic wave and modal vibration in damaged specimens. Modulation intensity that strongly relates to damage severity - is usually assessed in the frequency domain and often leads to confusing results when large modulations are involved. The paper investigates the time domain analysis of vibro-acoustic modulated signals. Several methods for instantaneous frequency calculation used to assess the intensity of modulation - are compared. Simulated and experimental data are used in these investigations.

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Volkov, Konstantin. "Coupled Simulation of Fluid Flow and Vibro-Acoustic Processes in the Channel with a Circular Cylinder". Fluids 7, nr 12 (11.12.2022): 382. http://dx.doi.org/10.3390/fluids7120382.

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Vibro-acoustic processes are an interacting set of pulsations of the working fluid and vibrations of mechanical structural elements. The simulation of vibro-acoustic processes in a long pipe with an elastic round cylinder is considered. The mathematical model is developed in a coupled formulation, when not only pressure pulsations cause pipe vibrations, but also vibrations of the mechanical subsystem affect sound wave propagation in the working fluid. The influence of vortex formation processes in the channel on the system dynamics is taken into account. The fluid flow is found using delayed detached eddy simulation. The flow regimes around a single round cylinder corresponding to various Reynolds numbers are investigated to validate the computational algorithm. The distributions of the flow quantities and vibro-acoustic behavior of the system are discussed.

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Wang, Xian-Zhong, Quan-Zhou Jiang, Ye-Ping Xiong i Xin Gu. "Experimental studies on the vibro-acoustic behavior of a stiffened submerged conical-cylindrical shell subjected to force and acoustic excitation". Journal of Low Frequency Noise, Vibration and Active Control 39, nr 2 (9.05.2019): 280–96. http://dx.doi.org/10.1177/1461348419844648.

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An experimental model was made to investigate the influence of force and acoustic excitation on the vibration and underwater sound radiation of the stiffened conical-cylindrical shell. Meanwhile, a coupled precise transfer matrix method and wave superposition method was also proposed to analyze vibro-acoustic responses of combined shells. To test accuracy of the present method, vibration and acoustic results of combined shells are firstly examined. As expected, results of present method are in excellent agreement with the ones in literature and model test. The experimental results show that free vibrations of the experimental test are consistent with the literature data and the present method’s results. Forced vibration and acoustic test results are also well agreed with the numerical results from the coupled precise transfer matrix method/wave superposition method. The comparisons show that the coupled precise transfer matrix method/wave superposition method is reliable and credible to solve the vibro-acoustic response of combined shells. The analysis shows that the acoustic excitation is the key factor for radiated noise in low-frequency range. However, the radiated noise resulted from force excitation is dominant in mid-high frequency band.

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Klepka, Andrzej, Wieslaw Jerzy Staszewski, T. Uhl, Dario di Maio, Fabrizio Scarpa i K. F. Tee. "Impact Damage Detection in Composite Chiral Sandwich Panels". Key Engineering Materials 518 (lipiec 2012): 160–67. http://dx.doi.org/10.4028/www.scientific.net/kem.518.160.

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This paper demonstrates impact damage detection in a composite sandwich panel. The panel is built from a chiral honeycomb and two composite skins. Chiral structures are a subset of auxetic solids exhibiting counterintuitive deformation mechanism and rotative but not reflective symmetry. Damage detection is performed using nonlinear acoustics,involves combined vibro-acoustic interaction of high-frequency ultrasonic wave and low-frequency vibration excitation. High-and low-frequency excitations are introduced to the panel using a low-profile piezoceramic transducer and an electromagnetic shaker, respectively. Vibro-acoustic modulated responses are measured using laser vibrometry. The methods used for impact damage detection clearly reveal de-bonding in the composite panel. The high-frequency weak ultrasonic wave is also modulated by the low-frequency strong vibration wave when nonlinear acoustics is used for damage detection. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal.

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Liu, Habibi, Chai, Wang i Chen. "A Numerical Study of Axisymmetric Wave Propagation in Buried Fluid-Filled Pipes for Optimizing the Vibro-Acoustic Technique when Locating Gas Pipelines". Energies 12, nr 19 (27.09.2019): 3707. http://dx.doi.org/10.3390/en12193707.

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Buried pipeline systems play a vital role in energy storage and transportation, especially for fluid energies like water and gas. The ability to locate buried pipes is of great importance since it is fundamental for leakage detection, pipeline maintenance, and pipeline repair. The vibro-acoustic locating method, as one of the most effective detection technologies, has been studied by many researchers. However, previous studies have mainly focused on vibro-acoustic propagation in buried water pipes. Limited research has been conducted on buried gas pipes. In this paper, the behavior of gas-dominated wave motion will be investigated and compared against water-dominated wave motion by adapting an established analytical model of axisymmetric wave motion in buried fluid-filled pipes. Furthermore, displacement profiles in spatial domain resulting from gas-dominated wave in buried gas pipeline systems will be analyzed, and the effects of pipe material, soil property, as well as mode wave type will be discussed in detail. An effective radiation coefficient (ERC) is proposed to measure the effective radiation ability of gas-dominated wave and water-dominated wave. It is observed that the gas-dominated wave in gas pipes cannot radiate into surrounded soil as effectively as water-dominated wave in water pipes because of the weak coupling between gas and pipe-soil. In this case, gas-dominated wave may not be the best choice as the target wave for locating buried gas pipes. Therefore, the soil displacements result from the shell-dominated wave are also investigated and compared with those from gas-dominated wave. The results show that for buried gas pipes, the soil displacements due to radiation of shell-dominated wave are stronger than gas-dominated wave, which differs from buried water pipe. Hence, an effectively exciting shell-dominated wave is beneficial for generating stronger vibration signals and obtaining the location information. The findings of this study provide theoretical insight for optimizing the current vibro-acoustic method when locating buried gas pipes.

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WANG, YI, SIPING CHEN, TIANFU WANG, TING ZHOU, QIAOLIANG LI, YI ZHENG i XIN CHEN. "DEVELOPMENT OF A GENERIC ULTRASOUND VIBRO-ACOUSTIC IMAGING PLATFORM FOR TISSUE ELASTICITY AND VISCOSITY". Journal of Innovative Optical Health Sciences 05, nr 01 (styczeń 2012): 1250002. http://dx.doi.org/10.1142/s1793545812500022.

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Tissue elasticity and viscosity are always associated with pathological changes. As a new imaging method, ultrasound vibro-acoustic imaging is developed for quantitatively measuring tissue elasticity and viscosity which have important significance in early diagnosis of cancer. This paper developed an ultrasound vibro-acoustic imaging research platform mainly consisting of excitation part and detection part. The excitation transducer was focused at one location within the medium to generate harmonic vibration and shear wave propagation, and the detection transducer was applied to detect shear wave at other locations along shear wave propagation path using pulse-echo method. The received echoes were amplified, filtered, digitized and then processed by Kalman filter to estimate the vibration phase. According to the phase changes between different propagation locations, we estimated the shear wave speed, and then used it to calculate the tissue elasticity and viscosity. Preliminary phantom experiments based on this platform show results of phantom elasticity and viscosity close to literature values. Upcoming experiments are now in progress to obtain quantitative elasticity and viscosity in vitro tissue.

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Pieczonka, Łukasz, Wieslaw Jerzy Staszewski i Tadeusz Uhl. "Investigation of Nonlinear Vibro-Acoustic Wave Modulation Mechanisms in Composite Laminates". Key Engineering Materials 569-570 (lipiec 2013): 96–102. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.96.

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This paper investigates the effect of low-frequency vibration and the related temperature field on nonlinear vibro-acoustic wave modulations. Experimental modal analysis was used to find natural frequencies and mode shapes of a composite laminate plate with seeded delamination. Temperature distribution was analyzed with a thermographic camera in the vicinity of damage for the identified vibration modes. These frequencies of these vibration modes were then used for low-frequency excitation in nonlinear acoustic tests. The correlation between the thermal field and the observed wave modulations was analyzed.

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Koo, Kunmo, Bert Pluymers, Wim Desmet i Semyung Wang. "Vibro-acoustic design sensitivity analysis using the wave-based method". Journal of Sound and Vibration 330, nr 17 (sierpień 2011): 4340–51. http://dx.doi.org/10.1016/j.jsv.2011.03.030.

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Rozprawy doktorskie na temat "Vibro-acoustic Wave"

Liu, Ying. "Acoustic wave propagation in radially layered cylindrical waveguides and its application in fluid energy resource exploration and transportation". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2021. https://ro.ecu.edu.au/theses/2492.

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Radially layered cylindrical acoustic waveguide is one of the most common waveguide structures, as well as a physical model prototype for many practical applications, such as boreholes and buried pipelines. Study on the wave propagation in radial-layered cylindrical waveguides can provide a theoretical basis for acoustic methods in reservoir exploration and fluid resource transportation, including acoustic well logging, underground pipeline detection and location. This PhD study is conducted from two aspects: one is the monopole acoustic well logging in determining velocities of heterogenous formation based on the borehole acoustics; and the other is research on acoustic wave propagation within buried pipeline systems based on the thin shell theory. A theoretical model is established firstly to investigate the characteristics of wavefield within a borehole surrounded by heterogeneous formation, where an additional layer with different velocities from original homogenous formation is included to simulate the radial velocity distribution in practice. The arrival time difference and P-wave amplitude variation in time domain are observed and compared against the waveforms from homogeneous formation model. In order to study the contributing factors of wave amplitude variation, the current head wave theory is employed and its applicability in heterogeneous formation model is also investigated. It is found that the velocity difference of two formation layers, Poisson's ratio difference, the thickness of the additional layer and the source frequency contribute together to determine the magnitude of the disturbance to the original homogenous formation, which is the main applicable condition of the current head wave theory. Based on our established forward mode, the simulated waveforms in time domain are found to carry the valuable information of heterogeneous formation velocities. Therefore, a stepwise inversion method is proposed to image the radial profiles of formation P- and S-wave velocities. Instead of determining the formation velocity variation and its corresponding radial position simultaneously as traditional methods do, the inversion procedure is divided into two steps: 1) the velocity array is determined by semblance processing of contiguous receiver pairs of acoustic array data; and 2) the thickness of the layer (radial position) is obtained based on ray theory. The modelling-based inversion results and the application to field data validates its efficiency and accuracy in profiling both P- and S -wave velocities of formation. Buried pipeline systems share the same category of physical model prototype with borehole, i.e. a radial-layered cylindrical waveguide. However, the thickness of pipe wall is usually very smaller or much smaller than the radius. To address this special case, various thin shell theories have been developed. In this research, an established analytical model of buried fluid-filled pipes is deployed to study the axisymmetric wave motion. The behaviour of gas dominated wave is investigated and compared against water-dominated wave. It is observed that the gas-dominated wave in gas pipes cannot radiate into surrounded soil as effectively as water-dominated wave in water pipes because of the weak coupling between gas and pipe-soil. For buried gas pipes, the soil displacements due to radiation of shell-dominated wave are stronger than gas-dominated wave, which differs from buried water pipe. Hence, exciting shell dominated wave is beneficial to generating stronger vibration signals and obtaining the location information, which would optimise the current vibro-acoustic method in locating buried gas pipes.

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Grialou, Matthieu. "Vibro-acoustics substructuring : Combining simulations and experimental identification of subdomains for low frequency vehicle acoustics". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI109/document.

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La sonorité de l’échappement joue un rôle significatif sur le confort acoustique des occupants, ainsi que sur le caractère du véhicule. L’étude proposée porte sur la problématique industrielle suivante : « Description et quantification de la transmission du son entre la bouche d’échappement et l’intérieur du véhicule ». Physiquement la transmission sonore entre l’échappement et l’intérieur du véhicule s’effectue en trois étapes : Propagation des ondes sonores de la canule à la surface extérieure du véhicule et conversion en énergie vibratoire (1) ; Le bruit structurel se propage de la peau extérieure du véhicule à l’habillage intérieur (2) ; La surface intérieure du véhicule rayonne de l’énergie dans l’air à l’intérieur (3). Dans l’état de l’art proposé, la méthode de sous-structuration vibro-acoustique Patch Transfer Functions (PTF) est considérée comme une alternative viable à la problématique proposée. Cependant, avant d’appliquer la méthode sur un véhicule complet, la problématique suivante devait être résolue : « Caractérisation expérimentale d’un sous-système par des mesures sur un système couplé ». Ce manuscrit propose une méthode originale pour mesurer des fonctions de transfert d’un système découplé, sur la base de la réponse d’un système couplé. En raison de la nature mal posée du problème inverse, une méthode originale de régularisation a été proposée. La méthode a été validée pas des essais numériques, puis par un test physique
Exhaust noise has a significant impact on acoustic comfort and the sound identity of a vehicle brand. The present study focuses on the: “Description and quantification of the sound transmission from the exhaust outlet into the interior of a vehicle”. Physically the noise propagation from the exhaust pipe to the cabin consists of three steps: The sound waves propagate through the air from the exhaust outlet to the external skin of the vehicle (1); the external skin vibrates and transmits its vibration to the internal skin (2); the internal skin radiates sound in the passengers’ cabin (3). The Patch Transfer Functions method, which is based on the framework of dynamic substructuring, allows for the consideration of this complex problem as simpler subproblems that consist of subsystem interactions. Yet the application of the method to a full vehicle requires addressing the problem: “Characterization of Patch Transfer Functions of a subsystem by means of measurement on a coupled system”. This dissertation presents an original inverse method for the measurement of Patch Transfer Functions. In industrial structures, this in-situ characterization is generally the only possible measurement method. Yet, due to the ill posed nature of the problem, the inversion process is difficult. An original regularization method is proposed. The method is tested through numerical simulations, and is validated with an experimental setup

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Nichols, Allen Bryant. "A method to use vibro-acoustic waves to diagnose pneumothorax and hemothorax /". Also available to VCU users online at:, 2005. http://hdl.handle.net/10156/1278.

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Nichols, Allen B. "A Method to Use Vibro-Acoustic Waves to Diagnose Pneumothorax and Hemothorax". VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd_retro/153.

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Whether caused by trauma, internal diseases, or spontaneously; pneumothorax and hemothorax are potentially life threatening illnesses. They are currently primarily diagnosed with x-rays, CT scans, and ultrasound imaging. While these methods are generally reliable, they are not always available to the injured patient. Life threatening pneumothoraces, such as tension pneumothorax, must be treated quickly. When diagnosed correctly, pneumothorax and hemothorax can be quickly mended through insertion of chest tubes. X-rays, CT scans, and ultrasound imaging require large scale equipment and are not always dependable. There is a more reliable, portable, and faster result producing method to diagnose pneumothorax. Vibro-acoustic waves can be sent through the chest and the resulting wave can be measured. By analyzing attenuation characteristics determined by the geometry of the chest structures, it can be determined if the patient's pleural space is healthy, contains air (pneumothrax), or contains fluid (hemothorax).

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Mazumder, Dibbyan. "Non-invasive Elastic Property Recovery of Tissue and Tissue-Like Objects from Ultrasound Excited Resonant Modes". Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4217.

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This thesis is on non-invasive elastic property measurement of tissue or tissue-mimicking materials through vibro-acoustography and ultrasound assisted diffusing wave spectroscopy (UA-DWS). Towards this, a known force is applied by focused ultrasound beams and the novel measurement is the set of natural frequencies of vibration of the object defined by the focal volume, also called the region-of-interest (ROI). In the first investigation, vibrio-acoustic (VA) secondary waves from the ROI, carrying its resonant modes, reaching the surface of the object, are made use of. A new physical model which explains the transport of local shear waves by modulating the VA wave and using it as a carrier is suggested and demonstrated. Through an eigenvalue analysis of the vibrating ROI (VROI) connection is established between the material properties of the ROI, including Young’s and shear modulus, and the measured resonant modes. The measured first natural frequencies from phantoms made of agar are inverted for their storage moduli, which are verified by simulation and independent measurement using a rheometer. The shift of the natural frequency with temperature is used to calibrate temperature at the ROI in tissue-mimicking objects. Through this, a remote temperature sensor for application in an ultrasound hyperthermia system is demonstrated. In the second investigation, ultrasound-assisted diffusing wave spectroscopy (UA-DWS) is adapted to measure many resonant modes of the ROI. The evolution of mean-squared displacement (MSD) obtained through DWS displays a plateau which becomes noisy with the introduction of ultrasound forcing. It is observed that the power spectrum of the fluctuations contains peaks at locations corresponding to many of the natural frequencies of the VROI. With this measurement of a number of resonant modes, recovery of the anisotropic elastic tensor of the material in the ROI is demonstrated in pork fat. This opens up the possibility of imaging progress of malignancy in soft-tissue organs through the components of this tensor. In the final part of the work, rotational diffusion micro-rheology is demonstrated by doing UA-DWS in agar phantoms using non-spherical scattering centres. The main findings of this study is the sharper rise in the transient part of the MSD curve and in the intensity of noise in its plateau leading to a scaling of the complex modulus of elasticity spectrum when compared those from spherical particles. The reason for these differences is owing to the ability of non-spherical particles to capture phase fluctuations arising of both translation and rotation. The modelling of the dynamics of the ROI was done through a generalized Langevin equation (GLE) for a single predominant translational degree of freedom (DOF) system particle representing the ROI. The fluctuations in the plateau are correctly recovered through a multiplicative, internal noise, constructed using micro-polar theory, in the stiffness term. Possibility of morphological characterization of biological cells and their internal constituents is demonstrated through laboratory experiments in phantoms.

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Książki na temat "Vibro-acoustic Wave"

Battis, James C. Vibro-acoustic forecasts for STS launches at V23, Vandenberg AFB: Results summary and the payload preparation room. Hanscom AFB, MA: Earth Sciences Division, Air Force Geophysics Laboratory, 1985.

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Części książek na temat "Vibro-acoustic Wave"

Andersen, Kristian Gjerrestad, Gbanaibolou Jombo, Sikiru Oluwarotimi Ismail, Yong Kang Chen, Hom Nath Dhakal i Yu Zhang. "Damage Characterisation in Composite Laminates Using Vibro-Acoustic Technique". W Springer Proceedings in Energy, 275–82. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63916-7_34.

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AbstractThe need to characterise in-service damage in composite structures is increasingly becoming important as composites find higher utilisation in wind turbines, aerospace, automotive, marine, among others. This paper investigates the feasibility of simplifying the conventional acousto-ultrasonic technique set-up for quick and economic one-sided in-service inspection of composite structures. Acousto-ultrasonic technique refers to the approach of using ultrasonic transducer for local excitation while sensing the material response with an acoustic emission sensor. However, this involves transducers with several auxiliaries. The approach proposed herewith, referred to as vibro-acoustic testing, involves a low level of vibration impact excitation and acoustic emission sensing for damage characterisation. To test the robustness of this approach, first, a quasi-static test was carried out to impute low-velocity impact damage on three groups of test samples with different ply stacking sequences. Next, the vibro-acoustic testing was performed on all test samples with the acoustic emission response for the samples acquired. Using the acoustic emission test sample response for all groups, the stress wave factor was determined using the peak voltage stress wave factor method. The stress wave factor results showed an inverse correlation between the level of impact damage and stress wave factor across all the test sample groups. This corresponds with what has been reported in literature for acousto-ultrasonic technique; thus demonstrating the robustness of the proposed vibro-acoustic set-up. Structural health monitoring, impact damage, acousto-ultrasonic testing, non-destructive testing.

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Tanner, Gregor, i Stefano Giani. "Wave transport in complex vibro-acoustic structures in the high-frequency limit". W IUTAM Symposium on the Vibration Analysis of Structures with Uncertainties, 187–200. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0289-9_14.

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Roy, Subhankar, i Tanmoy Bose. "Defect Detection in Delaminated Glass-Fibre/Epoxy Composite Plates Using Local Defect Resonance Based Vibro-Thermography Technique". W Acoustic Emission - New Perspectives and Applications. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101178.

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In the present scenario, composites are widely used for various applications in the field of aerospace, automobile, marine, sports, construction and electrical industries. The need of damage inspection for these composite structures has been of great importance. Complicated defects like delaminations present in the composite laminates can be detected effectively using nonlinear acoustic wave spectroscopy (NAWS). One of the NAWS techniques of detecting the delamination is based on intensification of vibration amplitudes at the delamination location, known as local defect resonance (LDR) technique. In this chapter, a numerical investigation for detecting delamination in glass fibre reinforced polymer (GFRP) composite based on vibrothermography technique will be discussed. A single periodic LDR frequency excitation is used to excite the GFRP plate, resulting in a local temperature rise at delamination region due to frictional heating at the damage interface. An explicit dynamic temperature displacement analysis will be carried out for a specific time period of LDR excitation. Subsequently, a heat transfer analysis will be performed to observe the temperature difference at top surface of the delaminated GFRP plate. Thus a numerical investigation will be carried out based on LDR excitation for high contrast imaging of delamination in composite materials using vibro-thermography.

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Pluymers, B., A. Hepberger, W. Desmet, H. H. Prebsch, D. Vandepitte i P. Sas. "Experimental validation of the wave based prediction technique for the analysis of the coupled vibro-acoustic behavior of a 3D cavity". W Computational Fluid and Solid Mechanics 2003, 1483–87. Elsevier, 2003. http://dx.doi.org/10.1016/b978-008044046-0.50362-6.

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Streszczenia konferencji na temat "Vibro-acoustic Wave"

Osheku, Charles A., Vincent O. S. Olunloyo i Theddeus T. Akano. "Analysis of Flow Induced Acoustic Waves in a Vibrating Offshore Pipeline". W ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20060.

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Flow induced acoustic wave characteristics in a vibrating subsea pipeline is investigated. For this problem, acoustic wave equations are formulated and matched for the various vibrating segments. The pipeline system is idealized as a network of fluid conveyance elastic beams resting on a moving seabed via recent advances in subsea pipeline vibrations. By employing operational methods, closed forms results as influenced by internal fluid variables and subsea soil geotechnical properties, are computed for design applications. It is further shown that the vibration of any pipeline system is modulated by transverse, longitudinal and vibro-acoustic natural frequencies.

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Chen, Minghao, i Yanfeng Shen. "Multi-Bolt Loosening Monitoring Using an Integrated Vibro-Acoustic Modulation Technique". W ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-70345.

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Abstract This paper proposed an integrated vibro-acoustic modulation method (IVAM) for multi-bolt loosening monitoring. Numerical simulations and experiments of a single bolt model are initially conducted to illuminate the contact acoustic nonlinearity (CAN) and vibro-acoustic modulation (VAM) phenomenon. The finite element model considers the coupled field effects and the contact interface of the bolted joint. A pumping wave with a certain low frequency combined with a probing signal sweeping through the frequency range of 50 kHz to 100 kHz was implemented and verified to effectively trigger VAM on the bolted connection. A comprehensive damage index (CDI) associated with the linear energy and nonlinear CAN change due to the bolt looseness is then proposed to evaluate bolt looseness in a full life cycle. For further study, IVAM is applied on a complex multi-bolt connection part to locate and identify the loosened bolts. Several cases are investigated to analyze its performance. An intelligent self-verification mechanism is used to ensure the accuracy of the results. The proposed IVAM method with an outcome CDI matrix possesses great application potential for multi-bolt connection monitoring with high sensitivity and accuracy. This paper finishes with summary, concluding remarks, and suggestions for future work.

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Trubulec, Wojciech, Rafal Radecki, Mariusz Osika, Aleksandra Ziaja-Sujdak i Wieslaw J. Staszewski. "Structural damage detection based on nonlinear vibro-acoustic modulations observed in shear horizontal wave propagation". W Health Monitoring of Structural and Biological Systems XVII, redaktorzy Paul Fromme i Zhongqing Su. SPIE, 2023. http://dx.doi.org/10.1117/12.2658450.

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Houhat, Nesrine, Vincent Tournat, Sebastien Menigot, Tarek Boutkedjirt, Redouane Drai i Jean-Marc Girault. "Optimization of Bifrequential Pump Excitation Parameters by Genetic Algorithm in Nonlinear Vibro Acoustic Wave Modulation Technique". W 2019 IEEE International Ultrasonics Symposium (IUS). IEEE, 2019. http://dx.doi.org/10.1109/ultsym.2019.8925663.

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Sun, Chao, Yuan-an He, Yue-chan Liu i Da-jing Shang. "Reconstruction of vibro-acoustic field in half-space based on wave superposition method using dual surface measurement". W 2011 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA 2011). IEEE, 2011. http://dx.doi.org/10.1109/spawda.2011.6167223.

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Maess, Matthias K., i Lothar Gaul. "Simulation of Structural Deformations of Flexible Piping Systems by Acoustic Excitation Using Modal Controllabilities". W ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71028.

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Valve action and pump fluctuation in piping systems can lead to undesired excitation of structural components by propagating sound waves in the fluid path. This vibro-acoustic problem is addressed by studying the dynamics as well as excitation mechanism. Fluid-structure interaction has a significant influence on both hydroacoustics and on structural deformation. Therefore, pipe models are generated in three dimensions by using Finite Elements to include higher-order deflection modes and fluid modes. The acoustic wave equation in the fluid is hereby fully coupled to the structural domain at the fluid-structure interface. These models are used for simulating transient response and for performing numerical modal analysis. Unfortunately, such 3D models are large and simulation runs turn out to be very time consuming. To overcome this limitation, reduced pipe models are needed for efficient simulations. The proposed model reduction is hereby based on a series of modal transformations and modal truncations, where focus is placed on the treatment of the nonsymmetric system matrices due to the coupling. Afterwards, dominant modes are selected based on controllability and observability considerations. Furthermore, modal controllabilities are used to quantify the excitation of vibration modes by white noise at the pipe inlet representing acoustic sources. The excitation of structural elements connected to the piping system can therefore be predicted without performing transient simulations. Numerical results are presented for spatially arranged complex piping systems including elbow pipes and joints connected to target structures to demonstrate the usefulness of the presented method for vibro-acoustic investigations. The method is to support the design and the analysis of fluid-filled elastic piping systems and its environment in the presence of acoustic sources such as in hydraulic systems.

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Yin, T. "Higher-order effects of amplitude-modulation vibro-acoustic technique for characterization thermal damages in cement-based material". W Structural Health Monitoring. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902455-33.

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Abstract. This paper proposes a new amplitude-modulation vibro-acoustic (AMVA) technique to detect thermal damage in pristine graphene (PRG) mortar materials. A new third-order solution for an amplitude-modulated low-frequency pump wave and a high-frequency probe wave in infinite isotropic material is presented. The solution includes higher-order sidebands generated by intrinsic and acquired nonlinearities. A nonlinear parameter is defined according to the third-order solution to assess the different levels of thermal damage. The experimental study demonstrates the sensitivity and feasibility of the AMVA technique by comparing the nonlinear parameter with the linear measurements of the ultrasonic pulse velocity (UPV) test. The results show that the proposed AMVA technique is a potential tool to detect and monitor thermal damage in cement-based structures.

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Peng, Ying, Zoujun Dai, Hansen A. Mansy i Thomas J. Royston. "Poro-Visco-Elastic Modeling of Mechanical Wave Motion in the Lungs". W ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80544.

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Noninvasive measurement of mechanical wave motion (sound and vibration) in the lungs may be of diagnostic value, as it can provide information about the mechanical properties of the lungs, which in turn are affected by disease and injury. In this study, two theoretical models of the vibro-acoustic behavior of the lung parenchyma are compared: (1) a Biot theory of poroviscoelasticity and (2) a simplified “bubble swarm” model for compression wave behavior. A “slow” compression wave speed predicted by the Biot theory formulation agrees well with the bubbly swarm theory in both analytical calculations and computational simulation. Biot theory also predicts a fast compression wave and a shear wave. The relative contributions of all three wave types are assessed. The effect of the air volume fraction is also investigated. Preliminary experimental measurements of the slow compression wave speed in the lung parenchyma are carried out and agree with theoretical predictions.

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Rejlek, Jan, i Hans H. Priebsch. "On the Use of the Wave Based Technique for a Three-Dimensional Noise Radiation Analysis of Coupled Vibro-Acoustic Problems". W SAE 2011 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-01-1713.

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Hambric, Stephen A., David A. Boger, John B. Fahnline i Robert L. Campbell. "Structure- and Fluid-Borne Acoustic Power Sources in 90 Degree Piping Elbows Excited by Turbulent Flow". W ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93043.

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The structure-borne and fluid-borne vibro-acoustic power spectra induced by turbulent fluid flow over the walls of a continuous 90 degree piping elbow are computed. Although the actual power input by the wall pressure fluctuations to the piping is distributed throughout the elbow, equivalent total powers input to various structural wavetypes (bending, torsion, axial) and fluid (plane waves) at the inlet and discharge of the elbow are computed. The powers at the elbow ‘ports’ are suitable inputs to wave-based and statistically-based models of larger piping systems that include the elbow. Calculations for several flow and structural parameters, including pipe wall thickness, flow speed, and flow Reynolds number are shown. The power spectra are scaled on flow and structural-acoustic parameters so that levels for conditions other than those considered in the paper may be estimated, subject to geometric similarity constraints (elbow radius/pipe diameter). The approach for computing the powers, which links Computational Fluid Dynamics, Finite Element and Boundary Element modeling, and efficient random analysis techniques, is general, and may be applied to other piping system components excited by turbulent fluid flow, such as U-bends and T-sections.

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