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Journal articles on the topic 'Vibroacoustic Analysis'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Burdzik, Rafał, Paweł Słowiński, and Łukasz Konieczny. "Preliminary studies of vibroacoustic signal images in the context of identification of a passing rail vehicle." WUT Journal of Transportation Engineering 121 (June 1, 2018): 31–40. http://dx.doi.org/10.5604/01.3001.0014.4552.

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Passing rail vehicles generate vibrations and noise. In most studies, these phenomena are analyzed in terms of impact on people, the environment and railway infrastructure. However, using the vibroacoustic methodology, generated vibration and noise signals can be treated as information carriers. The vast majority of publications in the field of vibroacoustics analyze the usability of signals to determine the technical condition of machines and systems. For many years Professor Rafał Burdzik has been conducting research in the area of vibration and noise propagation analysis in means of transport. As a result of this work, a new research hypothesis was developed as the ability to identify a vehicle or trainset based on recorded images of vibroacoustic signals. The article presents the results of preliminary tests, during which rail vibrations were recorded in three orthogonal axes and acoustic pressure signals in the axis perpendicular to the railway route.

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2

D'Amico, R., A. Pratellesi, M. Pierini, and N. Baldanzini. "Stochastic BEM for the Vibroacoustic Analysis of Three-Dimensional Structures." Advances in Acoustics and Vibration 2011 (July 24, 2011): 1–12. http://dx.doi.org/10.1155/2011/952407.

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Nowadays, extending the NVH prediction reliability to the whole frequency range is an attractive goal of vibroacoustics. Deterministic methodologies are well established for the low-frequency range, but, decreasing the wavelength, energy-based methods are necessary. In such a range, a crucial role is played by small perturbations which highly influence the response sensitivity. Moreover, taking into account these variations allows to make the product design more robust and even quicker. Introducing geometrical uncertainties within the classic BEM formulation allows to obtain the so-called stochastic BEM. As a result, the solution shows deterministic behaviour at low frequencies; decreasing the wavelength, the effect of the uncertainties smooths the response. Consequently, it is possible to obtain an averaged trend over the whole frequency range which asymptotically tends to the deterministic one. In this paper, we deal with three-dimensional acoustic SBEM. First, the formulation and its basic assumptions are presented. Secondly, they are applied to academic cases to show its potentialities in predicting vibroacoustic behaviour over a wide frequency range.

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3

Yao, Degui, Longfei Li, Songyang Zhang, Dianhai Zhang, and Dezhi Chen. "The Vibroacoustic Characteristics Analysis of Transformer Core Faults Based on Multi-Physical Field Coupling." Symmetry 14, no. 3 (March 7, 2022): 544. http://dx.doi.org/10.3390/sym14030544.

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Power transformers play an important role in the safe and reliable operation of the whole power grid. Once a fault occurs, it will endanger the normal operation of the transformer, and even result in power grid accidents. Accurate and practical methods of transformer fault monitoring and type identification have attracted extensive attention in the field of electrical engineering. However, it is difficult to obtain a large number of measurement data for different fault types on a large power transformer. The vibroacoustic characteristics of transformer faults have significant asymmetry. For the power transformer in service, it is complex and uneconomic to obtain the vibroacoustic signals under different fault conditions. To handle this problem, this paper proposes simulation methods of several common transformer core faults, based on multi-physical field coupling, and then analyzes the vibroacoustic signals generated by the operating transformer. Finally, it verifies the results of acoustic and vibration signals under several faults, through physical experiments. The results show that the transformer fault simulation method is reasonable and accurate. Furthermore, a change in the transformer core state will cause a change in the transformer vibroacoustic characteristics, and different types of core faults can be distinguished by the analysis of vibroacoustic characteristics.

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4

ZHENG, HUI, and ZHIPING WEI. "VIBROACOUSTIC ANALYSIS OF STIFFENED PLATES WITH NONUNIFORM BOUNDARY CONDITIONS." International Journal of Applied Mechanics 05, no. 04 (December 2013): 1350046. http://dx.doi.org/10.1142/s1758825113500464.

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This paper deals with vibroacoustic analysis of bidirectional stiffened thin plates with nonuniform discrete elastic edge restraints. The displacement-like governing equation of motion of the stiffened plate is derived by applying energy approach. A series of simple polynomials satisfying the Rayleigh–Ritz convergence criteria as well as the edge boundary conditions are then applied to discretize the governing equation, and the transverse displacements of the plate are solved considering the excitation of an incident acoustic plane wave. The commonly-adopted vibroacoustic indicators of elastic plane surface, i.e., mean square velocity (MSV), radiation efficiency (σ) and sound transmission loss (STL), are calculated for the stiffened plate with uniform and nonuniform discrete boundary conditions (BCs). Numerical studies are performed and results are discussed in detail for the vibroacoustic performance of the plate with different edge elastic restraints.

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5

Kao, Pi‐Jen, and M. A. Hamdi. "Sensitivity analysis for vibroacoustic interior problems." Journal of the Acoustical Society of America 102, no. 5 (November 1997): 3113. http://dx.doi.org/10.1121/1.420557.

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6

ANDO, Shigemasa, and Qinzhong SHI. "Vibroacoustic Analysis of Satellite Equipment Panel." Transactions of the Japan Society of Mechanical Engineers Series C 72, no. 720 (2006): 2462–69. http://dx.doi.org/10.1299/kikaic.72.2462.

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7

Bentow, Brian, Jonathan Dodge, Aaron Homer, Christopher D. Moore, Robert M. Keller, Craig Lee, Mark Thomas, et al. "Grid-enabling a vibroacoustic analysis toolkit." International Journal of High Performance Computing and Networking 5, no. 3 (2008): 168. http://dx.doi.org/10.1504/ijhpcn.2008.020861.

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8

Borucki, Sebastian, Andrzej Cichoń, Henryk Majchrzak, and Dariusz Zmarzły. "Evaluation of the Technical Condition of the Active Part of the High Power Transformer Based on Measurements and Analysis of Vibroacoustic Signals." Archives of Acoustics 42, no. 2 (June 27, 2017): 313–20. http://dx.doi.org/10.1515/aoa-2017-0033.

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Abstract This article presents the results of research connected with the development and industrial use of vibroacoustic methods for the evaluation of the technical condition of the active part of transformers. The article presents the results of the analysis of vibrations generated by the high power transformer in which a defect was found on the basis of tests of oil carried out using the chromatography tests. In order to confirm the damage of the active part of this transformer, vibroacoustic measurements were performed in three states of its operation. The measurement using the classical vibroacoustic method included the registration of vibrations at the idle speed and during the load operation of the transformer. The original diagnostic method, so-called the modified vibroacoustic method, was also used during the measurement. The analysis of signals recorded using the classical vibroacoustic method was carried out in the frequency domain by indicating the amplitude of even harmonic vibrations. However, the analysis of signals measured during the commissioning of the transformer was conducted in the time-frequency domain using the short-time Fourier transform (STFT), continuous wavelet transform (CWT), and discrete wavelet transform (DWT). On the basis of the analysis of the results obtained it was stated that the increased level of vibrations of this transformer is a consequence of the loss of rigidity of the mechanical structure of its core.

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9

Rychlik, Arkadiusz. "DETECTION OF STRUCTURAL DAMAGE IN VIBROACOUSTIC ANALYSIS." Journal of KONES. Powertrain and Transport 23, no. 1 (January 1, 2016): 279–88. http://dx.doi.org/10.5604/12314005.1213589.

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10

Côté, André F., Noureddine Atalla, and Jean-Louis Guyader. "Vibroacoustic analysis of an unbaffled rotating disk." Journal of the Acoustical Society of America 103, no. 3 (March 1998): 1483–92. http://dx.doi.org/10.1121/1.421286.

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11

Lee, Y. Albert. "Vibroacoustic analysis of a space shuttle payload." Journal of the Acoustical Society of America 84, S1 (November 1988): S118. http://dx.doi.org/10.1121/1.2025708.

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12

Pyra, Józef, and Maciej Kłaczyński. "Vibroacoustic measurements and analysis of blasting works." Journal of Vibroengineering 21, no. 2 (March 31, 2019): 526–37. http://dx.doi.org/10.21595/jve.2019.20053.

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13

Le Bot, A. "A VIBROACOUSTIC MODEL FOR HIGH FREQUENCY ANALYSIS." Journal of Sound and Vibration 211, no. 4 (April 1998): 537–54. http://dx.doi.org/10.1006/jsvi.1997.1378.

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14

Klekot, Grzegorz. "Indicator of Vibroacoustic Energy Propagation as a Selection Criterion of Design Solution." Archives of Acoustics 38, no. 4 (December 1, 2013): 489–94. http://dx.doi.org/10.2478/aoa-2013-0058.

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Abstract Contemporary tools which help to design technical objects refer to the conclusions drawn from studying the changes of physical processes accompanying the exploitation, especially to vibroacoustic processes. The main problem is to define such vibroacoustic measures, where their changes would model the analyzed physical phenomena in the best way. Basing on simple indicators which refer to occurring phenomena, it is possible to obtain accurate solutions with a satisfactory reliance level without using complex computing techniques needing detailed descriptors. According to the author, the indicators which are based on the analysis of vibroacoustic energy propagation are very useful in solving engineering problems. These indicators are useful while diagnosing the condition of technical systems, identifying and minimizing the vibroacoustic risks. The possibilities of using such indicators in order to find design solution are illustrated by sample results of the research of the structures with vibroacoustic elements which reduce the noise of rail vehicles by the rail vibration damping.

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15

Jin, Lihong, Junpeng Shao, Xigui Wang, Yongmei Wang, and Baixue Fu. "Vibroacoustic characteristics analysis of a planetary gear reducer considering the exterior housing structure." Mechanical Sciences 12, no. 1 (May 20, 2021): 539–57. http://dx.doi.org/10.5194/ms-12-539-2021.

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Abstract. Previous studies have attempted to identify weak links in the dynamic characteristics of the planetary gear reducer (PGR) exterior body structure (EBS). Through numerical simulation, these studies analyzed the mode and natural frequencies and the vibration types of each order of the EBS. However, these scholars have never focused on the main factors affecting the dynamic characteristics of the EBS of this subject. This study in the topic has analyzed the vibroacoustic characteristics of an EBS and optimized its design using numerical simulation. Herein, the contribution of the vibration transfer path from the excitation points on the exterior body to the machine foot is emphatically revealed, and the influences of the main structural parameters on the transfer characteristics are discussed. An optimal EBS for a PGR with lower acoustic vibrations is designed in detail, and a composite EBS with damping vibration attenuation and acoustic absorption is proposed. The radiation acoustic characteristics without acoustic protection and damping materials are analyzed. These research results are implemented in order to realize the dynamic characteristics, transmission, and radiation acoustic characteristics as objects of optimization, and the structural design parameters of the PGR exterior body are deeply optimized using dynamic modification and sensitivity analysis. This topic focuses on the vibroacoustic coupling of EBS in stationary fluid and average flow field. Based on the analysis method of theoretical modeling and numerical calculation, the EBS dynamic response and vibroacoustic characteristics under the action of frontal excitation external acoustic flow field are studied, which will be beneficial to explore the comprehensive optimization design of PGR dynamic and vibroacoustic properties.

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16

Gimadeev, M. R., and A. A. Li. "Analysis of automated surface roughness parameter support systems based on dynamic monitoring." Advanced Engineering Research 22, no. 2 (July 9, 2022): 116–29. http://dx.doi.org/10.23947/2687-1653-2022-22-2-116-129.

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Introduction. Domestic and foreign works on the milling of complex-profile surfaces with a ball-end tool were analyzed. Methods of surface quality control and ways to provide amplitude parameters of roughness, based on research data and field experiments, were considered. Theoretical provisions on the determination of cutting forces and the results of vibroacoustic diagnostics were presented.Materials and Methods. The methods of correlation analysis, comparison and generalization of the results were applied. The data were calculated at different tool angles, taking into account the instantaneous cutting forces, and were fixed in the range of values of the variable feed per tooth (fz) and the angle of inclination of the surface (γ). The vibroacoustic diagnostic data and theoretical data of the presented model at different tool inclination angles were verified by experiment. Consequently, such methods can be used to predict surface roughness parameters.Results. The relationship between cutting forces, tool inclination angle, and vibroacoustic diagnostics data was found. A model of the cutting force and tool displacements was formulated taking into account the inclination of the surface. The optimal range of the inclination angle of the tool to the surface to be machined, at which the minimum values of the amplitude parameters of roughness were achieved, was determined. The sound vibrations obtained empirically, presented in spectral and wave forms, were in good agreement with data from other sources. This allowed us to conclude about the feasibility of forecasting and monitoring roughness parameters in real time through acoustics.Discussion and Conclusions. It was established that the growth of forces in the direction ae(X) and fz(Y) was observed at γ > 40°. This was due to the distribution of the components of the cutting force along the cutting edge and depended on the inclination of the surface. The amplitude parameters decreased when the angle increased from 10 to 40 degrees. The found interrelations of force analysis, processing directions, and vibroacoustic diagnostics have validated the use of vibroacoustic diagnostics to predict surface roughness. Acoustic diagnostics, regardless of the layout of technological equipment, enables to quickly adjust the sound device and assess the impact of cutting modes on roughness parameters.

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17

Thomas, Valerie. "A Vibroacoustic Database Management Center for Shuttle and Expendable Launch Vehicle Payloads." Journal of the IEST 30, no. 6 (November 1, 1987): 24–26. http://dx.doi.org/10.17764/jiet.1.30.6.j172813701hn2553.

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A Vibroacoustic Database Management Center has recently been established at the Jet Propulsion Laboratory (JPL). The center uses the Vibroacoustic Payload Environment Prediction System (VAPEPS) computer program to maintain a database of flight and ground-test data and structural parameters for both shuttle and expendable launch-vehicle payloads. Given the launch-vehicle environment, the VAPEPS prediction software, which employs Statistical Energy Analysis (SEA) methods, can be used with or without the database to establish the vibroacoustic environment for new payload components. This paper summarizes the VAPEPS program and describes the functions of the Database Management Center at JPL.

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18

STELMASIAK, Zdzisław, and Mariusz RUDNICKI. "Detectability of gear damage in combustion engines through a vibroacoustic method." Combustion Engines 158, no. 3 (July 1, 2014): 12–22. http://dx.doi.org/10.19206/ce-116933.

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The paper presents a new methodology in vibroacoustic diagnostics of internal combustion engines during a cold test on the production line. This method utilizes order analysis of harmonic components of vibroacoustic signals taken from a combustion engine driven with an electric motor to identify the source of noise and vibration amplitude. The presented analysis of the harmonic orders was used to diagnose the damage of the gear teeth.

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19

Cascone, Nunziante, Luca Caivano, Giuseppe D’Errico, and Roberto Citarella. "Vibroacoustic Assessment of an Innovative Composite Material for the Roof of a Coupe Car." Applied Sciences 11, no. 3 (January 26, 2021): 1128. http://dx.doi.org/10.3390/app11031128.

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The objective of this paper is the vibroacoustic evaluation of an innovative material for a sports car roof, aiming at replacing fiberglass composite materials. Such evaluation was carried out using numerical and experimental analysis techniques, with cross-comparison between the corresponding results. The innovative material under analysis is a composite material, with a thermoplastic polypropylene matrix and reinforcement made of cellulose fibers. In order to validate the virtual dynamic modeling of the new material, the inertance on different points of some sheets made of the material under analysis was evaluated by an in-house made experimental activity, performed in the CRF (Fiat Research Center) test room, and cross-compared with corresponding results from a numerical analysis performed with the MSC Nastran software. Then, a realistic model of the car roof of the Alfa Romeo 4C car, made with the new material, was implemented and analyzed from the vibroacoustic point of view. The mere switch to the new material, with no changes in the geometry/structure of the car roof, did not allow preserving the original values of static rigidity, dynamic rigidity, and configuration of modal shapes. For this reason, a geometric/structural optimization of the component was performed. Once the new geometry/structure was defined, a vibroacoustic analysis was carried out, checking for a possible coupling between the fluid cavity modes and the structure car body modes. Finally, the vibroacoustic transfer functions to the driver’s ear node were assessed, considering two different excitation points on the structure. The excellent damping capacity of the proposed material led to an improvement in the vibroacoustic transfer functions and to a reduction in the weight of the pavilion.

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20

STELMASIAK, Zdzisław, and Mariusz RUDNICKI. "Impact of external interferences on vibroacoustic signals coming from combustion engine during cold test." Combustion Engines 160, no. 1 (February 1, 2015): 26–35. http://dx.doi.org/10.19206/ce-116899.

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In the paper is presented impact of external interferences on vibroacoustic signals coming from a spark ignition engine’s vibrations in cold test performed on engine assembly line. As the basis to the analysis were used signals of piezoelectric sensor mounted on cylinder block of the engine driven by electric motor. In course of the testing it has been used the order tracking analysis of the vibrations during the cold test, while experimental results were used to statistic analysis of significance of influence with use of the MiniTab computer program. The main objective of the investigations was to verify actually obtained vibroacoustic signals and to minimize interferences coming from the measuring system. It should contribute to reduction of tolerance limits and improved detection of faulty engines with use of vibroacoustic methods. The investigations have shown significant impact of contact surface of the cylinder block with the sensor and impact of deformations of compression spring on results of recorded vibroacoustic signal. Such impact should be taken into considerations in numerical analysis of the signal. It has been proposed to perform activities to reduce influence of the interferences on recorded signals. Results of the investigations have been already utilized in production cold tests of spark ignition engines.

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21

Nering, Krzysztof, and Alicja Kowalska-Koczwara. "Determination of Vibroacoustic Parameters of Polyurethane Mats for Residential Building Purposes." Polymers 14, no. 2 (January 13, 2022): 314. http://dx.doi.org/10.3390/polym14020314.

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This paper is aimed at investigating the use of polyurethane mats, usually used as ballast mats, for residential building purposes. Ballast mats have features that may improve the vibroacoustic comfort in residential rooms. Their strength is certainly an advantage, along with vibration and acoustic insulation. However, the problem that an engineer has to deal with, for example in modeling these types of mats, is a limited knowledge of the material’s vibroacoustic parameters. Knowledge of these may be useful for residential buildings. This paper presents measurements of the vibroacoustic parameters of polyurethane mats, together with a suitable methodology and some results and analysis. The two main material parameters responsible for vibroacoustic protection were measured: the dynamic stiffness, which is related to the acoustic properties of the material, and the critical damping coefficient, which is obviously responsible for damping. The measurement methodology is clearly described. A total of five polyurethane materials with different densities were tested. It was possible to identify a relationship between the material density and the vibroacoustic parameters, which could offer an indication of which material to use, depending on the stimulus affecting a human in a given location.

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22

SZYMAŃSKI, Grzegorz, and Wojciech MISZTAL. "Analysis of measurement points sensitivity of vibration signals on the stand of jet engine." Combustion Engines 171, no. 4 (November 1, 2017): 279–82. http://dx.doi.org/10.19206/ce-2017-448.

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The diagnostic testing of internal combustion engine can be made by using working processes and methods which take advantage of leftover processes. Working processes give information about general condition of internal combustion engine. Leftover processes give information about condition of particular subassemblies and kinematic couples; hence they are used as autonomous processes or as processes supporting other diagnostic methods. Methods based on analysis of vibrations and noise changes to determine technical condition of object are named as vibroacoustic diagnostics. In papers about vibroacoustic diagnostics of engine, problems connected with difficulty to select test point and to define diagnostic parameters containing essential information about engine’s condition, are most often omitted. Selection of engine’s working parameters and conditions of taking measurements or recording vibration signal are usually based on references, researcher’s experience or intuition. General assumptions about taking measurements of signal closest to its source are most often used. This paper presents a new approach to vibroacoustic diagnostics of jet engine. Selection of measurement points of vibration signals on the basis of tests stand results was suggested and perform a sensitivity analysis of measurement points on the engine support.

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23

Ihlenburg, Frank. "The Medium-Frequency Range in Computational Acoustics: Practical and Numerical Aspects." Journal of Computational Acoustics 11, no. 02 (June 2003): 175–93. http://dx.doi.org/10.1142/s0218396x03001900.

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The upper frequency limit of vibroacoustic calculations with finite element methods is usually concluded from resolution rules for the minimal wavelength encountered in the problem. Here, we derive general resolution rules that account for the pollution effect in finite element solutions of time-harmonic equations. These rules are given for the Helmholtz equation and the Bernoulli beam equation. The latter are based on an analysis of numerical dispersion for finite difference solutions. The theoretical results are given in the broader context of industrial vibroacoustic computations in the medium-frequency range. The governing equations of deterministic vibroacoustic computations and statistical energy analysis are reviewed with the goal to indicate, respectively, upper and lower frequency bounds for the applicability of either model. From the discussion of priorities in industrial application, open questions for theoretical investigations are deduced.

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24

Borello, Gérard, Laurent Gagliardini, and Denis Thenail. "Virtual statistical energy analysis for vibroacoustic industrial prediction." Journal of the Acoustical Society of America 123, no. 5 (May 2008): 3314. http://dx.doi.org/10.1121/1.2933769.

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25

Christen, Jean-Loup, Mohamed Ichchou, Bernard Troclet, Olivier Bareille, and Morvan Ouisse. "Global sensitivity analysis of analytical vibroacoustic transmission models." Journal of Sound and Vibration 368 (April 2016): 121–34. http://dx.doi.org/10.1016/j.jsv.2016.01.009.

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26

Culla, Antonio, Walter D׳Ambrogio, Annalisa Fregolent, and Silvia Milana. "Vibroacoustic optimization using a statistical energy analysis model." Journal of Sound and Vibration 375 (August 2016): 102–14. http://dx.doi.org/10.1016/j.jsv.2016.04.026.

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27

Zhou, Haian, Yugang Zhao, Huayong Wu, and Jianbing Meng. "The vibroacoustic analysis of periodic structure-stiffened plates." Journal of Sound and Vibration 481 (September 2020): 115402. http://dx.doi.org/10.1016/j.jsv.2020.115402.

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28

Serbout, Sanae, Laurent Maxit, and Frédéric Michel. "Vibration of a stiffened pipe filled with a bubbly liquid: analysis of resonance frequencies in function of bubble fraction." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (August 1, 2021): 1008–18. http://dx.doi.org/10.3397/in-2021-1730.

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The characterization of the presence of bubbles in industrial fluid circuits may be extremely important for many safety issuses. It is well known that the acoustic properties of liquids can be drastically modified by a small amount of gaz content in the liquid. At sufficiently low frequencies, the speed of sound depends primarily on the gas volume fraction. The variation of the gas fraction may then induce some variations in the vibroacoustic behavior of the pipe transporting the liquid. Analysis of the pipe vibrations can then help in the monitoring of the bubble presence. In such a context, the aim of this study is to show how the the presence of bubbles in the liquid could affect the resonance frequencies of the pipe. A numerical vibroacoustical model has been developed to predict the vibroacoustical behavior of a stiffened cylindrical shell filled with a bubbly liquid exhibiting low frequency resonances. The model, experimentally verified with a well-characterized bubbly liquid, is then used to analyse the frequency shifts of the shell resonances in function of the bubble. Keywords : pipe, heavy fluid, numerical modelling, circumferential admittance approach, cylindrical shell, resonance frequency, void fraction

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29

Wieczorek, Andrzej N., and Radosław Kruk. "Minimization of Vibroacoustic Effects as a Criterion for Operation of Gear Transmissions in Accordance with Sustainable Development Principles." Management Systems in Production Engineering 21, no. 1 (March 1, 2016): 12–19. http://dx.doi.org/10.2478/mspe-02-01-2016.

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Abstract In correctly functioning maintenance systems it is most important to prevent possible failures. A reduction of the vibroacoustic effects accompanying the operation of machines and equipment, including transmissions, is among the factors that lower the probability of a failure. The paper presents the results of the research on the impact of operational factors on vibroacoustic conditions of transmissions. The factors covered by the analysis included a change in the mating conditions of gear wheels associated with the wear of tooth surfaces, operation of transmissions in subharmonic conditions of the main resonance and the temperature of the lubricating oil. The study demonstrated that it was possible to reduce the vibroacoustic effects generated by gear transmissions by changing the conditions of their operation. Based on the results obtained, it has been found that the operation of gear transmissions in accordance with the sustainable development principles requires technical services to take active measures consisting in the search for optimal operating conditions in terms of the vibroacoustic conditions.

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30

Karpiński, R., P. Krakowski, J. Jonak, A. Machrowska, M. Maciejewski, and A. Nogalski. "Analysis of differences in vibroacoustic signals between healthy and osteoarthritic knees using EMD algorithm and statistical analysis." Journal of Physics: Conference Series 2130, no. 1 (December 1, 2021): 012010. http://dx.doi.org/10.1088/1742-6596/2130/1/012010.

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Abstract The knee joint is the largest and one of the most vulnerable and most frequently damaged joints in the human body. It is characterized by a complex structure. All articular surfaces are covered with hyaline cartilage. This cartilage has minimal regenerative capacity. Under the influence of cyclical micro-injuries, inflammatory mediators, prolonged excessive pressure or immobility, and thus disturbance of tissue nutrition, the cartilage becomes susceptible to damage and is easily covered with villi, cracks and abrasion. As a result, this translates into changes in the friction and lubrication processes within the joint and may affect the generated vibroacoustic processes. In this study, the signals recorded in a group of 28 volunteers were analysed, 15 of them were healthy people (HC) and 13 were people diagnosed with osteoarthritis (OA) qualified for surgery. The study aims to check the usefulness of the EMD (Empirical Mode Decomposition) algorithm in the filtration procedures of vibroacoustic signals. This algorithm is most often used in the analysis of signals that are most often nonlinear and non-stationary. Selected statistical indicators, such as RMS, VMS, variance and energy, were determined for the signals constituting the sum of the IMFs (Intrinsic Mode Functions) 1-8, having a normal distribution in the assessment of damage to the articular cartilage of the knee joint. Statistical analysis was performed for the values of individual indicators obtained. The vibroacoustic signals were recorded using CM-01B contact microphones placed in the central part of the medial and lateral joint fissure for movement in the range of 90°–0°–90° in closed kinetic chains (CKC) in the control group (HC) and the group of patients diagnosed with osteoarthritis (OA).

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31

Dziurdź, Jacek. "Modelling of the Toothed Gear Operations with the Application of the Analysis of the Gear Sliding Mesh Velocity Changes." Solid State Phenomena 180 (November 2011): 200–206. http://dx.doi.org/10.4028/www.scientific.net/ssp.180.200.

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Searching for effective diagnostic methods of basic elements of driving systems is still the actual problem. The most often the vibroacoustic diagnostics based on the analysis of vibrations and noises generated by the working system is applied. Driving systems of vehicles are rather complicated. They consist, among others, of various types of toothed gears. Within the vibroacoustic signals recorded during their operation not only harmonic components – being the effect of these gears operations - are present, but also components generated by other elements. Due to this, there is a necessity of the development of models of the vibroacoustic signals generation by the main elements of the driving system. Such models will allow to identify – within the recorded signals – the harmonic components related to processes occurring during the gear operation. These models should be relatively simple due to the possibility of their application in diagnostic devices operating in the ‘on line’ mode. Modelling of the single-stage toothed gear, with the application of the analysis of the gear sliding mesh velocity changes, is presented in the hereby paper.

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32

Žiaran, Stanislav, and Ondrej Chlebo. "Noise Control Transmission Methods of the Combustion Engine by Means of Reduction of the Vibration." Archives of Acoustics 41, no. 2 (June 1, 2016): 277–84. http://dx.doi.org/10.1515/aoa-2016-0027.

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Abstract Transmission of vibroacoustic energy from an internal combustion engine (ICE) to its surroundings largely depends on how it is mounted, on available transmission paths and on the construction of the vehicle body and/or its surrounding structures. This is especially true in low speed engines in enclosed areas which generate perceptually weak noise, but strong low-frequency waves which energy has a negative impact on human health, comfort and driving safety especially in prolonged exposure to the source. The primary aim of the article was to analyse components of the ICE unit which had a determining impact on the reduction of low-frequency waves. Thus, the structurally transmitted noise from the ICE to its surrounding structure (body of the passenger vehicle) was analysed. The results of the vibroacoustic measurements were compared to modal analysis in order to determine possible resonance sources in the vehicle body and/or for assessing the influence of the vehicles safety gear on the generated vibroacoustic energy transfer into the cabin area of the passenger vehicle. Measurements were made for a passenger vehicle at rest and operating in its most common operational speed as well as for the stationary ICE of a cogenerate unit (CGU). Measurements and FFT analysis were used for the detection of the vibroacoustic energy sound pressure level (noise) and mechanical vibration. Firstly, the low-frequency noise sources were determined and their direct effects on the human body were investigated. Finally, this paper suggests some measures which may contribute to the reduction of undesirable vibroacoustic energy in enclosed areas.

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Ovechkina, Zhanna, Oksana Sachkova, and Anatoly Sharaban. "ANALYSIS OF THE RESULTS OF OPERATIONAL TESTS OF LOCOMOTIVE TRACTION PASSENGER CARS IN TERMS OF INFRASOUND AND INTERNAL NOISE." Akustika 32 (March 1, 2019): 256–58. http://dx.doi.org/10.36336/akustika201932256.

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Liu, Zhenguo, Ling Zhang, Biao Wu, Ming Jin, Degui Yao, Dianhai Zhang, and Dezhi Chen. "Measurement Analysis and Improvement of Vibroacoustic Characteristics of Amorphous Alloy Transformer." Energies 15, no. 3 (January 27, 2022): 949. http://dx.doi.org/10.3390/en15030949.

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The amorphous alloy transformer has a smaller coercive force and lower specific iron loss. It precedes the conventional silicon steel sheet transformer from the perspective of energy conservation. However, amorphous alloy material has a more significant magnetostriction coefficient, resulting in stronger vibration and acoustic noise. This paper investigates the measurement, analysis, and improvement of vibroacoustic characteristics of one three-phase, four-frame amorphous alloy distribution transformer to reduce environment noise pollution. This study adopts a coupling analysis method of magnetic–force–acoustic multi-physical fields to analyze the vibroacoustic characteristics. It then introduces a novel combination method of magnetic field analysis and an electric circuit to improve the efficiency of magnetic field analysis. This new combination method can greatly reduce the solution time of multiple physical fields through comparison with the traditional field-circuit coupling method. Different from other studies, this paper studies the acoustic and vibration characteristics of an amorphous alloy transformer under both no-load and load conditions. It is found that the load vibration noise of an amorphous transformer is more severe than that of a traditional silicon steel transformer. Accordingly, the study measures the vibroacoustic characteristic with different excitations and load levels under different working conditions to verify the numerical analysis method. Furthermore, according to the analysis results, this paper suggests a few vibration and noise control strategies. In conclusion, the paper deduces an essential basis for exploring strategies of vibration reduction and noise control for amorphous alloy distribution transformers.

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Radkowski, S. "Vibro-acoustic diagnostics of low-energy stage of failures evolution." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 223, no. 5 (May 1, 2009): 589–97. http://dx.doi.org/10.1243/09544100jaero413.

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The work concerns diagnosis of the origins and development of early stages of defects based on information found in vibroacoustic signal. At the beginning the necessity of selection of diagnostic parameters dependent upon the amount of dissipated energy and related defect development is proven. Emphasizing the fact that defect development does not always lead to a significant growth of the vibroacoustic signal's power, the author has shown importance of analysis and modelling of low-energy defects.

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Nowakowski, Tomasz, Paweł Komorski, and Franciszek Tomaszewski. "The efficiency of tram articulations compared to vibroacoustic emissions." Archives of Transport 44, no. 4 (November 30, 2017): 55–63. http://dx.doi.org/10.5604/01.3001.0010.6161.

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Human quality of life is constantly increasing, and so does the comfort of travel by various means of public transport, especially rail transport. One of the more crucial criteria for assessment of travel comfort is vibroacoustic comfort. This aspect is also substantial among rail vehicle operators and manufacturers. Sound quality evaluation is related to psychoacoustic indicators, but reducing the levels of acoustic pressure does not always correlate to increased quality of the perceived sound and improvement of human sound perception. Moreover the cause of unpleasant noise has to be taken into consideration. In many examples it is induced by specific vibrations and/or friction forces through components. The following article presents experimental research carried out in the in-situ conditions, testing the quality of work carried out by tram articulations considering vibroacoustic emissions. Several measurements were taken of vibroacoustic signals in several urban rail vehicles of the same type. Two different trams were chosen for analysis and their vibroacoustic emission levels as well as sound quality parameters were compared. One of the more crucial aspects of the research was to determine the dependency between vibrations around the area of articulations and squealing noise. The results indicate a large correlation between signals and deterioration in the work quality of the articulation in the given tram. Moreover, the authors suggest expanding on currently carried out maintenance in order to minimise inconvenient vibroacoustic phenomena during use.

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Wróbel, Radosław, Monika Andrych-Zalewska, Wojciech Ambroszko, and Szymon Fryda. "Practical application of wavelets in the engine's vibroacoustic analysis." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 12 (December 31, 2018): 282–84. http://dx.doi.org/10.24136/atest.2018.399.

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Vibrations are most often measured using ceramic piezoelectric sensors - accelerometers. The accelerometer uses a piezoelectric effect to measure the dynamic acceleration of its housing. They are mounted directly on the measuring system (moving or rotating, such as gearboxes, rotating blades, turbine engines or bearings). This is not their only use, because they can also be used in shock measurements, such as NCAP in the field of automotive safety or diagnostics (unfortunately they have lower accuracy than low-frequency LDV). The main advantage of using a piezoelectric accelerometer is its linearity in a wide range frequency and a huge range of work dynamics. Engine vibration measurements are usually made at different points of the engine to be independent of each other. The engine block is a characteristic measuring point because it is best available. Accelerometers are assembled by glue, screwing or magnetic connection. The obtained vibroacoustic signal is most often analyzed using Fourier analysis. The following article presents another possibility of on-line analysis: short-term wavelet analysis "on-line".

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Troszyń ski, Adam, and Michał Liss. "Possibilities of the electrochemical drilling process’s (ECM) vibroacoustic analysis." MATEC Web of Conferences 182 (2018): 02013. http://dx.doi.org/10.1051/matecconf/201818202013.

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In the course of metals treatment, there occurs a direct interaction of a tool with the processed material. It is connected with occurrence of different physio-mechanical processes significantly influencing the material’s properties, among the others such as the surface’s roughness. An attempt to estimate the shaped material’s surface in the course of the ECM process based on the measurements of the high-potential plate’s oscillations, is presented in the article.

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Lu, Huancai, and Sean Wu. "On vibroacoustic modal analysis of arbitrarily shaped vibrating structures." Journal of the Acoustical Society of America 125, no. 4 (April 2009): 2725. http://dx.doi.org/10.1121/1.4784471.

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Cohan, Lucy E. "Vibroacoustic launch analysis and alleviation of lightweight, active mirrors." Optical Engineering 50, no. 1 (January 1, 2011): 013002. http://dx.doi.org/10.1117/1.3530077.

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Nowicki, Ryszard, Roman Słowiński, and Jerzy Stefanowski. "Rough sets analysis of diagnostic capacity of vibroacoustic symptoms." Computers & Mathematics with Applications 24, no. 7 (October 1992): 109–23. http://dx.doi.org/10.1016/0898-1221(92)90159-f.

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Wu, Shuanglong, Shuguang Zuo, Xudong Wu, Fu Lin, Hongmin Zhong, and Yaodan Zhang. "Vibroacoustic Prediction and Mechanism Analysis of Claw Pole Alternators." IEEE Transactions on Industrial Electronics 64, no. 6 (June 2017): 4463–73. http://dx.doi.org/10.1109/tie.2016.2645502.

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Kornatowski, Eugeniusz. "Mechanical-Condition Assessment of Power Transformer Using Vibroacoustic Analysis." Key Engineering Materials 500 (January 2012): 40–44. http://dx.doi.org/10.4028/www.scientific.net/kem.500.40.

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This paper presents a method for vibroacoustic analysis of a transformer in the steady state. The standard approach to this problem has been based on analysis of the vibration frequency spectrum recorded with an accelerometer mounted on the transformer’s tank. To improve legibility of measurement results, the paper suggests the analysis method for the relative coefficient of harmonic frequency contents hnorm(f). The conducted experiment showed that high values of hnorm within a wide frequency range testify to deformation of windings and degradation of solid insulation.

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Afonskii, B. D., A. I. Raigorodskii, V. V. Ditev, and V. B. Voronov. "Analysis of the vibroacoustic characteristics of cryogenic helium machines." Chemical and Petroleum Engineering 24, no. 9 (September 1988): 490–92. http://dx.doi.org/10.1007/bf01147287.

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Yotov, V. V., M. Remedia, G. S. Aglietti, and G. Richardson. "Improved Craig–Bampton stochastic method for spacecraft vibroacoustic analysis." Acta Astronautica 178 (January 2021): 556–70. http://dx.doi.org/10.1016/j.actaastro.2020.07.011.

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Ovechkina, Zhanna, Oksana Sachkova, and Anatoly Sharaban. "APECTS OF FORECASTING OF VIBROACOUSTIC CHARACTERISTICS OF CARS OF LOCOMOTIVE DRAFT." Akustika 32 (March 1, 2019): 259–61. http://dx.doi.org/10.36336/akustika201932259.

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Sawczuk, Wojciech, Agnieszka Merkisz-Guranowska, and Armando-Miguel Rilo Cañás. "Assessment of disc brake vibration in rail vehicle operation on the basis of brake stand." Eksploatacja i Niezawodnosc - Maintenance and Reliability 23, no. 2 (February 3, 2021): 221–30. http://dx.doi.org/10.17531/ein.2021.2.2.

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The scientific aim of the article is to present the relationship between the vibroacoustic signals of the right and left friction pad during braking, depending on the mass distribution, as an element of the lever system. This article presents the results of tests of a railway disc brake in the scope of vibrations generated by pads in various states of wear located on both sides of the brake disc. The tests were carried out on the brake stand using the vibroacoustic method including the analysis of amplitudes and frequencies and the thermal imaging method. Special attention was paid to the analysis of the classic lever mechanism as a multimass system influencing the thermo-mechanical characteristics and vibrations of the pads on the right and left side of the brake disc. Uneven mass distribution of the system translates into uneven wear of the friction components. The scientific aim of this paper is to present the relation between vibroacoustic signals of the right and left friction pad during braking depending on the mass distribution of the lever system component.

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Chen, Haosen, Peng Yang, and Yijun Shen. "Vibration Power Flow of an Infinite Cylindrical Shell Submerged in Viscous Fluids." Shock and Vibration 2020 (September 12, 2020): 1–14. http://dx.doi.org/10.1155/2020/8828204.

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In the previous investigations of the vibroacoustic characteristics of a submerged cylindrical shell in a flow field, the fluid viscosity was usually ignored. In this paper, the effect of fluid viscosity on the characteristics of vibration power flow in an infinite circular cylindrical shell immersed in a viscous acoustic medium is studied. Flügge’s thin shell theory for an isotropic, elastic, and thin cylindrical shell is employed to obtain the motion equations of the structure under circumferential-distributed line force. Together with the wave equations for the viscous flow field as well as continuity conditions at the interface, the vibroacoustic equation of motion in the coupled system is derived. Numerical analysis based on the additional-damping numerical integral method and ten-point Gaussian integral method is conducted to solve the vibroacoustic coupling equation with varying levels of viscosity. Then, the variation of the input power flow against the nondimensional axial wave number in the coupled system with different circumferential mode numbers is discussed in detail. It is found that the influence of fluid viscosity on the vibroacoustic coupled system is mainly concentrated in the low-frequency band, which is shown as the increase of the crest number and amplitude of the input power flow curves.

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Zyabirov, I. M., and V. I. Zyabirova. "Preventive diagnostics of grain combines." Traktory i sel hozmashiny 80, no. 1 (January 15, 2013): 38–39. http://dx.doi.org/10.17816/0321-4443-65920.

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SZYMAŃSKI, Grzegorz, and Franciszek TOMASZEWSKI. "Experimental method for the selection of points of measurement diagnostic vibration signals on internal combustion engine." Combustion Engines 150, no. 3 (September 1, 2012): 72–79. http://dx.doi.org/10.19206/ce-117035.

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The diagnostic testing of internal combustion engine can be made by using working processes and methods which take advantage of leftover processes. Working processes give information about general condition of internal combustion engine. Leftover processes give information about condition of particular subassemblies and kinematic couples; hence they are used as autonomous processes or as processes supporting other diagnostic methods. Methods based on analysis of vibrations and noise changes to determine technical condition of object are named as vibroacoustic diagnostics. In papers about vibroacoustic diagnostics of engine, problems connected with difficulty to select test point and to define diagnostic parameters containing essential information about engine’s condition, are most often omitted. Selection of engine’s working parameters and conditions of taking measurements or recording vibration signal are usually based on references, researcher’s experience or intuition. General assumptions about taking measurements of signal closest to its source are most often used. This paper presents a new approach to vibroacoustic diagnostics of internal combustion engine. Selection of test points of vibration on the basis of impact tests results was suggested and performed a sensitivity analysis of measurement points on the cylinder head, the force impulse.

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