Artykuły w czasopismach: „Nonlinear vibro-acoustics”

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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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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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Klepka, A., WJ Staszewski, RB Jenal, M. Szwedo, J. Iwaniec i T. Uhl. "Nonlinear acoustics for fatigue crack detection – experimental investigations of vibro-acoustic wave modulations". Structural Health Monitoring: An International Journal 11, nr 2 (25.07.2011): 197–211. http://dx.doi.org/10.1177/1475921711414236.

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Broda, Dariusz, Andrzej Klepka, Wieslaw Jerzy Staszewski i Fabrizio Scarpa. "Nonlinear Acoustics in Non-Destructive Testing - From Theory to Experimental Application". Key Engineering Materials 588 (październik 2013): 192–201. http://dx.doi.org/10.4028/www.scientific.net/kem.588.192.

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A growing interest in non-destructive testing methods based on nonlinear acoustics have been observed for the last ten fifteen years. The majority of methods in this area take their origin from the observation that fatigue damaged materials often behave like mesoscopic nonlinear materials (e.g. rocks) in which nonlinear phenomena have been observed for years. The most important phenomena include: higher harmonics generation, vibro-acoustic wave modulations, amplitude dependent resonance frequency shift and slow dynamic effects. All these phenomena result mainly from elastic wave interactions with contact-type defects. There is enough experimental evidence in the literature showing that these nonlinear effects are much more distinct in damaged materials than in intact ones. Despite the fact that many experimental techniques - based on nonlinear acoustic phenomena - have been developed for the last ten years, the physical mechanism of elastic wave interaction with damage materials still not clear. The main reason is the variety of possible nonlinear mechanisms involved. This includes: nonlinear elasticity and dissipation, contact acoustic nonlinearity based on herztian and rough surfaces contact theories and other effects such us adhesion, friction and thermoelasticity. This paper provides a short summary of various theoretical developments and examples of applications to damage detection in different materials.

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Pieczonka, Łukasz, Andrzej Klepka, Wieslaw Jerzy Staszewski, Tadeusz Uhl i Francesco Aymerich. "Analysis of Vibro-Acoustic Modulations in Nonlinear Acoustics Used for Impact Damage Detection - Numerical and Experimental Study". Key Engineering Materials 558 (czerwiec 2013): 341–48. http://dx.doi.org/10.4028/www.scientific.net/kem.558.341.

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The paper investigates experimentally the effect of low-frequency vibration on nonlinear vibro-acoustic wave modulations applied to the detection of Barely Visible Impact Damage (BVID) in a composite plate. Finite Element (FE) modeling was used in a pretest stage to identify different motion scenarios of delaminated surfaces and relate them to natural frequencies of the damaged plate. In particular the opening-closing and frictional sliding actions of the defected interfaces have been considered. Subsequently, the identified frequencies have been used for low frequency excitation in nonlinear acoustic experiments on a composite plate with impact damage.

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Klepka, Andrzej, Wieslaw Jerzy Staszewski, Dario di Maio, Fabrizio Scarpa, Kong Fah Tee i Tadeusz Uhl. "Sensor Location Analysis in Nonlinear Acoustics Used for Damage Detection in Composite Chiral Sandwich Panels". Advances in Science and Technology 83 (wrzesień 2012): 223–31. http://dx.doi.org/10.4028/www.scientific.net/ast.83.223.

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This paper demonstrates damage detection in a smart sandwich panel with integrated piezoceramic transducers. The panel is built from a chiral honeycomb and two composite skins. A low-profile, surface-bonded piezoceramic transducer is used for high-frequency ultrasonic excitation. Low-frequency excitation is performed using a piezoceramic stack actuator. Ultrasonic sensing is performed using laser vibrometry. Nonlinear acoustics is applied for damage detection. The study is focused on sensor location analysis with respect to vibro-acoustic wave modulations. The paper demonstrates that when structure is damaged, the high-frequency “weak” ultrasonic wave is modulated by the low-frequency “strong” vibration wave. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal. However, intensity of modulation strongly depends on sensor location.

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Zagrai, Andrei, Dimitri Donskoy, Alexander Chudnovsky i Hudson Wu. "Assessment of material fatigue damage using nonlinear vibro‐modulation technique". Journal of the Acoustical Society of America 115, nr 5 (maj 2004): 2576. http://dx.doi.org/10.1121/1.4784208.

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Korotkov, Aleksey S., i Alexander M. Sutin. "Nonlinear vibro‐acoustic method for diagnostics of cracks in construction materials". Journal of the Acoustical Society of America 97, nr 5 (maj 1995): 3377. http://dx.doi.org/10.1121/1.412620.

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Qiu, D., S. Seguy i M. Paredes. "Design criteria for optimally tuned vibro-impact nonlinear energy sink". Journal of Sound and Vibration 442 (marzec 2019): 497–513. http://dx.doi.org/10.1016/j.jsv.2018.11.021.

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Donskoy, Dimitri, Alexander Chudnovsky, Andrei Zagrai, Edvard Golovin i Vinod Agarwala. "Fatigue Damage Monitoring and Remaning Life Assessment using Nonlinear Vibro‐Modulation Technique". Journal of the Acoustical Society of America 123, nr 5 (maj 2008): 3396. http://dx.doi.org/10.1121/1.2934077.

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Carcione, A., P. Blanloeuil i M. Veidt. "Demodulation technique to identify nonlinear characteristics of vibro-acoustic NDT measurements". Journal of Sound and Vibration 466 (luty 2020): 115014. http://dx.doi.org/10.1016/j.jsv.2019.115014.

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Norouzi, Hamed, i Davood Younesian. "Vibro-acoustic numerical analysis for the geometrically nonlinear viscoelastic rectangular plate subjected to subsonic compressible airflow". Applied Acoustics 174 (marzec 2021): 107779. http://dx.doi.org/10.1016/j.apacoust.2020.107779.

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Andrade, Luis, Robin S. Langley i Tore Butlin. "Equivalent linearisation in a hybrid FE-SEA approach for nonlinear vibro-acoustic modelling". Journal of Sound and Vibration 526 (maj 2022): 116788. http://dx.doi.org/10.1016/j.jsv.2022.116788.

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Houhat, Nesrine, Vincent Tournat, Sébastien Ménigot, Tarek Boutkedjirt i Jean Marc Girault. "Optimal pump excitation frequency for improvement of damage detection by nonlinear vibro acoustic modulation method in a multiple scattering sample". Applied Acoustics 155 (grudzień 2019): 222–31. http://dx.doi.org/10.1016/j.apacoust.2019.06.010.

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Lawal, Iyabo G., i Michael R. Haberman. "Meta-interface textures for increased frictional damping in elastic structures". Journal of the Acoustical Society of America 152, nr 4 (październik 2022): A171. http://dx.doi.org/10.1121/10.0015919.

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The unique behavior of acoustic and elastic metamaterials results from engineered subwavelength material composition and geometry. Though there has been a profusion of metamaterial research over the last two decades, relatively little focus has been on the dissipation of vibro-acoustic energy. Most research on metamaterials for acoustic damping have focused on viscous or viscoelastic effects [1]. However, the design of interfaces within materials or at connecting surfaces between elastic structures to amplify micro-friction events due to the relative motion of contacting surfaces is of interest for the reduction of vibro-acoustic energy. Dissipation due to friction is best represented as a nonlinear constitutive response. Here, we report on the use of friction via meta-interface textures to create interfaces with elevated damping, leading to increased macroscopic dissipation. We employ the five-parameter Bouc-Wen model to describe the complex behavior at these interfaces and study the influence of subwavelength interface texture on the parameters of the friction model. This increased dissipation from this approach can be used to reduce structural vibrations and the transmission of acoustical energy in structural components. [1] C. L. Bacquet et al., “Metadamping: Dissipation emergence in elastic metamaterials.” Adv. App. Mech. 51, 115i–164, (2018).

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Youssef, Balkis, i Remco I. Leine. "A complete set of design rules for a vibro-impact NES based on a multiple scales approximation of a nonlinear mode". Journal of Sound and Vibration 501 (czerwiec 2021): 116043. http://dx.doi.org/10.1016/j.jsv.2021.116043.

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Zhou, Jianxing, Wenlei Sun i Li Cao. "Vibration and noise characteristics of a gear reducer under different operation conditions". Journal of Low Frequency Noise, Vibration and Active Control 38, nr 2 (25.01.2019): 574–91. http://dx.doi.org/10.1177/1461348419825603.

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Gear system is characterized by high efficiency, compact structure, and transmission ratio stability, and it has been extensively applied in various industrial equipment. This paper presents a novel preliminary estimate method for gear reducer noise radiation and vibration characteristics, and systematic researches on radiation characteristics of gear reducer are made. In the noise analysis process, the influence of time-varying mesh stiffness, error excitation, and tooth flank contact feature are comprehensively considered, the linear vibration model and nonlinear vibro-impact model for transmission system is set up, and then the dynamic load of the gearbox is obtained by solving the model. The dynamic load of bearing is taken as an excitation, the finite element method/boundary element method is adopted to analyze vibration and noise radiation characteristics of the gear reducer. The time domain response and field point noise spectrum at sound field are obtained, and the influence of harmonic components in excitation on vibration noise radiation of gearbox are discussed. The dynamic characteristics and sound radiation characteristics of gear reducer under different operating conditions are calculated, the change pattern of frequency component of the bearing dynamic load and noise radiation based on operating condition are obtained, and some interesting conclusions are observed from research that the gearbox produce the linear vibration and noise under the heavy load condition. Meanwhile, the nonlinear vibro-impact and noise is appeared under light load condition. The distribution of the gearbox radiated nose is uniform in various conditions, but noise takes sub-harmonic components as fundamental frequency and more peaks in the noise spectrum are observed. With the increase of the rotary speed, the noise tallies with the trend described by Kato formula except that under the gear system resonance speed. The impact force between teeth flanks shall be on the increase with the increase of rotary speed, and gear pair vibration experiencing a course from irregular vibration to regular periodic rattle vibration. With the increase of load, the noise of reducer changes with load as the variation of logarithmic function. For the noise in the process with load on the increase from no-load (the load is 0), the gear reducer vibration condition experienced both sides collision, single-side collision, and normal meshing in three stages. The radiated nose is increased gradually, but the abrupt change happened in critical positions between both sides collision and single-side collision as well as single-side collision and normal meshing in the process. The conclusions of this paper will offer theoretical basis for reducer to reduce vibration and noise.

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Deng, Guoming, Jianwang Shao, Songlin Zheng i Xian Wu. "Study on sound transmission loss modeling through simplified sealing specimens and an automotive door sealing system". Noise Control Engineering Journal 69, nr 4 (1.07.2021): 301–30. http://dx.doi.org/10.3397/1/376929.

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An imperfect sealing system would be the main path of the noise propagating into the interior compartment of a high-speed vehicle. The study on the sound insulation modeling of automotive door sealing systems, which involve complicated threedimensional sealing structures and gap cavities, has attracted more and more attention. This study employs hybrid finite element–statistical energy analysis (FE-SEA) models to predict the sound transmission loss of three simplified sealing specimens and an actual automotive door sealing system. For the actual sealing system under compression, a three-dimensional FEmodel is built to simulate the nonlinear compression, which can acquire the compressed geometries and pre-stress modal results of the seals for further prediction of the sound transmission loss. The hybrid FE-SEA method is firstly verified by the experimental result of a double plate vibro-acoustic system and another numerical method. Several factors concerning the modeling, including the boundary conditions, the equivalent elastic modulus for the hyper-elastic rubber, the specimen length, and the structural grid size, are considered to study their impacts on the sound transmission loss. The effects of using shell elements and using solid elements to model the sealing rubber layers are also compared. The results of this study can provide guides regarding the trade-off between the modeling efficiency and accuracy, so that it has significance for engineering modeling, as well as the design and optimization of automotive door sealing systems.

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Singh, Ashish Kumar, Vincent B. C. Tan, Tong Earn Tay i Heow Pueh Lee. "Experimental Investigations Into Nonlinear Vibro-Acoustics for Detection of Delaminations in a Composite Laminate". Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems 2, nr 1 (17.09.2018). http://dx.doi.org/10.1115/1.4041122.

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In recent years, nonlinear vibro-acoustic methods have shown potential to identify defects which are difficult to detect using linear ultrasonic methods. However, these methods come with their own challenges such as frequency dependence, requirement for a high excitation amplitude, and difficulties in distinguishing nonlinearity from defect with nonlinearity from other sources to name a few. This paper aims to study the dependence of nonlinear vibro-acoustic methods for detection of delaminations inside a composite laminate, on the excitation methods and excitation frequencies. It is shown that nonlinear vibro-acoustic methods are highly frequency dependent and commonly used excitation signals which utilize particular values of excitation frequencies might not always lead to a clear distinction between intact and delaminated regions of the specimen. To overcome the frequency dependence, signals based on frequency sweep are used. Interpretation of output response to sweep signals to identify damage is demonstrated using an earlier available approach, and a simpler approach is proposed. It is demonstrated that the damage detection with sweep signal excitations is relatively less dependent on excitation frequency than the conventional excitation methods. The proposed interpretation technique is then applied to specimens with delamination of varying sizes and with delaminations at different depths inside the laminate to demonstrate its effectiveness.

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Kolappan Geetha, G., D. Roy Mahapatra, Chi-Won In i D. A. Raulerson. "Transient Vibro-Thermography and Nonlinear Resonant Modes". Journal of Vibration and Acoustics 142, nr 6 (22.05.2020). http://dx.doi.org/10.1115/1.4046860.

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Abstract Transient vibro-thermography for nondestructive evaluation and super-resolution imaging of material defects invariably employs nonlinear contact dynamics involving the ultrasonic actuator (horn) and the surface of the target structure. It produces nonlinear resonant modes of vibration in the target structural component. Vibration-induced heat generation is one phenomenon involved here. However, the contribution of nonlinear vibration on the thermal signature is poorly understood. In this study, we consider a metallic component with a thin-walled cavity as a representative sharp feature tuned to the main excitation frequency of the ultrasonic actuator. We have developed a mathematical model to simulate transient thermal signature of structural discontinuity/cavity/defect. The model incorporates a coupled thermo-viscoelastic heat generation process in the bulk material based on the Helmholtz free energy formulation. To capture the source of nonlinear resonant modes, we incorporate the stick-separation contact dynamics due to the ultrasonic horn and the target structural component. Commercial finite element simulation (comsol multiphysics) is used to quantitatively understand the nonlinear vibration response and the thermal transport behavior of the target structure with the cavity. The proposed model accounts for the effects of both the normal and the shear components of deformation contributing on heat generation and captures the nonlinear modal contribution on the heat flux map. The study shows how the geometric feature and material parameters produce an evolution of the nonlinear subsuper harmonics along with the primary harmonics tuned to the excitation frequency. Results obtained from numerical simulations are compared with the experimental results.

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Yoon, Jong-yun, i Iljae Lee. "Nonlinear Analysis of Vibro-Impacts for Unloaded Gear Pairs With Various Excitations and System Parameters". Journal of Vibration and Acoustics 136, nr 3 (1.04.2014). http://dx.doi.org/10.1115/1.4026927.

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Torsional systems with clearance-type nonlinearities have inherent vibratory problems such as gear rattle. Such vibro-impacts generally occur on the unloaded gear pairs of a vehicle correlated with the firing excitation of an engine. This study investigates the gear rattle phenomena on unloaded gear pairs with different excitation conditions and various system parameters. First, a linear time-invariant system model with six degrees of freedom is constructed and then a numerical analysis is applied to the gear rattle motion. Smoothening factors for clutch stiffness and hysteresis are employed for the stability of numerical simulations. Second, the dynamic characteristics of vibro-impacts are studied by examining the fast Fourier transform (FFT) components of the gear mesh force in a high frequency range. The effects of various system parameters on the vibro-impacts are examined using a nonlinear system model. Finally, the vibro-impacts, in terms of “single-sided” and “double-sided” impacts, are identified in phase planes.

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Li, Tao, Sébastien Seguy i Alain Berlioz. "Dynamics of Cubic and Vibro-Impact Nonlinear Energy Sink: Analytical, Numerical, and Experimental Analysis". Journal of Vibration and Acoustics 138, nr 3 (12.04.2016). http://dx.doi.org/10.1115/1.4032725.

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This paper is devoted to study and compare dynamics of primary linear oscillator (LO) coupled to cubic and vibro-impact (VI) nonlinear energy sink (NES) under transient and periodic forcing. The classic analytical procedure combining the approach of invariant manifold and multiple scales is extended from the analysis of steady-state resonance to other regimes, especially strongly modulated response (SMR). A general equation governing the variation of motion along the slow invariant manifold (SIM) is obtained. Numerical results show its convenience to explain the transition from steady-state response to SMR and the characteristics of SMR for periodic forcing. Targeted energy transfer (TET) under transient forcing can also be well understood. Experimental results from LO coupled to VI NES under periodic forcing confirm the existence of SMR and its properties (e.g., chaotic). They also verify the feasibility of the general equation to explain complicated case like SMR in experiments.

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Li, Wenke, Nicholas E. Wierschem, Xinhui Li, Tiejun Yang i Michael J. Brennan. "Numerical Study of a Single-Sided Vibro-Impact Track Nonlinear Energy Sink Considering Horizontal and Vertical Dynamics". Journal of Vibration and Acoustics 141, nr 6 (11.09.2019). http://dx.doi.org/10.1115/1.4044486.

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Abstract In this paper, the single-sided vibro-impact track nonlinear energy sink (SSVI track NES) is studied. The SSVI track NES, which is attached to a primary structure, has nonlinear behavior caused by the NES mass moving on a fixed track and impacting on the primary structure at an impact surface. Unlike previous studies of the SSVI track NES, both the horizontal and vertical dynamics of the primary structure are considered. A numerical study is carried out to investigate the way in which energy is dissipated in this system. Assuming a track shape with a quartic polynomial, an optimization procedure that considers the total energy dissipated during a time period is carried out, to determine the optimum NES mass and track parameter. It is found that there is dynamic coupling between the horizontal and vertical directions caused by the SSVI track NES motion. The vibrational energy, originally in the structure in the horizontal direction, is transferred to the vertical motion of the structure where it is dissipated. Considering that many civil and mechanical systems are particularly vulnerable to extreme loads in the horizontal direction, this energy transformation can be beneficial to prevent or limit damage to the structure. The effect on energy dissipation of the position of the impact surface in the SSVI track NES and the ratio of the vertical to horizontal stiffness in the primary structure are discussed. Numerical results demonstrate a robust and stable performance of the SSVI track NES over a wide range of stiffness ratios.

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Artykuły w czasopismach na temat „Nonlinear vibro-acoustics”

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