2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)最新文献

{"title":"Torsion Vibration Calculation in Recipracating Compressors","authors":"P. Kapustin, T. Degtyareva","doi":"10.1109/DVM55487.2022.9930885","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930885","url":null,"abstract":"The trend in the development of compressor trains is that manufacturers are striving to increase its capacity while reducing the mass-dimensional parameters of the machine and maintaining its reliability. One of the main way to raise the capacity of a reciprocating compressor unit is to increase the shaft speed. However, as the speed increases, the risk of torsion vibration appears. The resulting torsion vibration is the reason of an additional source of noise, and also cause additional dynamic loads that reduce the life of the crankshaft and may lead to its breakdown. Furthermore, crankshaft failure can cause breakdown of other parts of the compressor unit such as bearings, crosshead, piston and etc. Additionally, the large generated peak torques can overload components such as gears, splines, and couplings. Accordingly, a thorough torsion vibration analysis should be included as an integral part of the reciprocating compressor design process. This paper presents main stages of torsion vibration calculation in a multi-row reciprocating compressor including natural and forced vibration analysis. General rules of modeling an equivalent torsion system, natural frequencies calculation by Holzer's method and matrix-eigenvalue method, evaluation of operation mode of a compressor unit by Campbell diagram, harmonic analysis of the torque, determination of the vibration amplitudes and additional stress caused by torsion vibration are described in this work.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126457355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acoustic and Aerodynamic Properties of the Petal-shaped Absorption Silencers","authors":"A. Taratorin, A. Mukhametov","doi":"10.1109/DVM55487.2022.9930897","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930897","url":null,"abstract":"Presented the mathematical modeling results of acoustic and aerodynamic properties of petal-shaped silencer. Petal-shaped silencers are used for noise reduction in cylindrical channels. Such channels are often formed behind axial fans, which provide high flow consumption. For example, axial fans of dry cooling towers or roof fans can be noise sources. A swirling stream moves in the channel behind the fan. The advantage of using petal-shaped silencers is that they have the least aerodynamic drag. A special twist of the petal-shaped plates of the silencer allows to achieve channel overlap. An extra effect of noise reduction is achieved by eliminating the sound energy transit through the channel. Two mechanisms determine the effectiveness of the petal-shaped silencer. Noise reduction occurs due to the absorption of sound energy by sound-absorbing material. But also, part of the sound energy is reflected from the surface of the plates back into the channel. In order to determine the acoustic efficiency of petal-shaped silencer, mathematical modeling was carried out in the Ansys. When modeling, the propagation of airborne noise along a cylindrical channel at the place where silencers are installed is considered. The acoustic efficiency of petal-shaped silencers with a twist angle of 50° and 75° is compared with cylindrical and radial ones. Authors determined that at the octave band frequency of 2000 Hz, the decrease in sound pressure level (SPL) in the channels of petal silencers is 15.4 dB. It is 4–11 dB higher than the acoustic efficiency of cylindrical and radial ones. The use of petal-shaped plates allows to increase the acoustic efficiency of the silencer. For different twist angles of the plates, dependences of the decrease in SPL in the channels of petal-shaped silencers for the octave bands are presented. The aerodynamic drag of the silencer as important as its acoustic efficiency. It is possible to increase the acoustic efficiency of a dissipative silencer due to a denser placement of the material in the channel. But, in this case, the aerodynamic drag of the silencer also increases. The cases when a flow with a uniform velocity profile and a swirling flow are considered. The aerodynamic drag calculated when using: a fairing in the central part at the inlet and outlet of the silencer, the installation of special blades on the output edges of the silencer, the use of spacers between the plates. Measures have been identified to achieve the lowest aerodynamic drag. Recommendations for the use of petal-shaped silencers in cylindrical channels are given. Such silencers allow you to reduce the aerodynamic drag by almost 4 times.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117088200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impedance of an Orifice in Nonlinear Regimes with Grazing Flow","authors":"A. Komkin, A. Bykov, Tanzilya Karakaeva","doi":"10.1109/DVM55487.2022.9930900","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930900","url":null,"abstract":"The results of experimental studies of the acoustic impedance of circular orifices in a wide range of the sound pressure level and the presence of a grazing flow are presented. Plates of 2 mm thick with an orifice of 5 and 10 mm in diameter were used. The dependences of the real and imaginary parts of the orifice impedance on the sound pressure levels and air flow velocity at frequencies of 150 Hz and 300 Hz are evaluated.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130595796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Impedance Along the Surface of the Acoustic Liner Sample Based On Numerical Simulation","authors":"I. Khramtsov, V. Palchikovskiy, A. A. Kuznetsov","doi":"10.1109/DVM55487.2022.9930912","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930912","url":null,"abstract":"The aim of the study is a comparative analysis of the impedance values of a single-layer locally reacting acoustic liner sample, obtained by different methods based on numerical simulation of physical processes in a duct with grazing sound waves. The study considers a liner sample with 23 honeycomb cells arranged in a line along the sample. Each cell contains one hole with a diameter 5.6 mm located in the center of the cell, which corresponds to a perforation degree 11.7%. A full-scale experiment on the grazing incidence of waves relative to the sample surface in a duct is simulated; flow effect is not taken into account. Numerical simulation is performed on the basis of solving the non-stationary compressible Navier-Stokes equations in a three-dimensional formulation. As a result of numerical simulation, the acoustic pressure and normal acoustic velocity are found on the surface of the each cell and hole, which makes it possible to calculate the impedance for each cell by a direct method. In addition, for each cell, the impedance is calculated by Dean's method. Impedance calculations are carried out in the frequency range 500–2500 Hz. The results obtained demonstrate that the impedance varies along the liner sample. In this case, in the region of resonant frequencies, the real part of the impedance for the cells at the end of the sample (from the 20th to the 23rd cell) becomes negative, i.e. the cells amplifies the sound. The numerical simulation also gives the acoustic pressure at points on the wall opposite the liner sample, which corresponds to the microphones located in a full-scale experiment. Based on the acoustic pressures recorded at these points, the impedance is calculated by an impedance eduction method. This method represents the minimization of the objective function, which is the residual between the calculated and experimental (in our case, taken from numerical simulation) acoustic pressure values at the microphone installation points. The calculated acoustic pressure is determined by solving the linearized Euler equations with the impedance boundary condition by the finite element method. The eduction of constant and variable impedance along the acoustic liner sample is considered. A comparison of the obtained impedance values reveals that the impedance calculated by the direct method is in good agreement with the known concepts of physical processes in the locally reacting acoustic liner. In turn, the impedance eduction method, which takes into account the impedance variability along the liner sample, requires imposing the additional conditions that are responsible for the correct description of the impedance behavior at high SPL.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133036077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fast Algorithms for Two-Dimensional Discrete Fourier Transform of Vibroacoustic Signals in Solving Problems of Control and Technical Condition of Machines and Mechanisms","authors":"Ponomareva Olga, Ponomarev Alexey, Smirnova Natalia","doi":"10.1109/DVM55487.2022.9930921","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930921","url":null,"abstract":"The aim of the work is to develop fast algorithms for two-dimensional discrete Fourier transform of vibroacoustic signals in solving problems of control and technical condition analysis of machines and mechanisms. The development of science and technology, the improvement of digital information technologies, the expansion of the range of their applications has led to the need to describe the characteristics, properties and states of the studied complex objects of dynamics and vibration diagnostics of machines not by one-dimensional, but by two-dimensional vibroacoustic finite discrete signals (2D VFD signals). The performed systems analysis of the transition from one-dimensional Fourier processing (1D Fourier processing) to two-dimensional digital Fourier processing (2D Fourier processing) of 2D VFD signals showed that such transition is far from trivial. Some important properties of 2D Discrete Fourier Transform (2D DFT) underlying 2D Fourier Processing have no analogues at all in the case of 1D Discrete Fourier Transform (1D DFT) and hence some important properties of 2D DFT cannot be obtained by generalizing the properties of 1D DFT for the two-dimensional case. When passing from 1D to 2D Fourier processing of 2D VFD signals, the computational costs also increase by several orders of magnitude. This poses an important challenge in developing fast procedures for implementing 2D DFT of 2D VFD signals. At the same time, 2D VFD signals have a complex, mixed structure and, as a rule, consist of two parts: the sum of periodic deterministic components (most often with incommensurable spatial frequencies) and the sum of random components. The Fourier processing of such a class of 2D VFD signals also requires the development of methods for increasing the speed of 2D DFT. The paper sets and successfully solves the problems of increasing the speed of methods and algorithms for two-dimensional digital Fourier processing (2D Fourier processing) of 2D VFD signals of complex structure. One of the important analytical properties of 2D DFT is the separability of its kernel. Based on the consequences arising from this property of the 2D DFT kernel, two methods have been developed to reduce the number of computational operations in the implementation of 2D DFT of 2D VFD signals. The article considers a fast algorithm of one-dimensional fast Fourier transform with thinning in time, without replacement (no place) for calculating 2D DFT. The paper proves the effectiveness and efficiency of the proposed methods by means of mathematical modeling.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115828465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamics of a Jet Positional Pneumatic Drive System for Long-stroke Installation Movements","authors":"D. Korotych, V. Sidorenko, S. Prikhodko","doi":"10.1109/DVM55487.2022.9930895","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930895","url":null,"abstract":"- Long-stroke installation and coordinate movements occupy a significant amount of executive movements, these movements are used in coordinate tables, automated warehouses, cutting machines, etc. Long-stroke movements entail a deterioration in the dynamic quality and positioning of the drive due to the presence of piston friction and nonlinear characteristics of the compressed gas flow in significant volumes of the pressure and drain cavities of the cylinder. In this paper, a positional pneumatic drive system for long-stroke installation movement is proposed, a mathematical model is compiled, oscillograms are obtained, a description and discussion are carried out.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127511353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Vibroacoustics of the Superjet 100 Aircraft","authors":"P. Moshkov, V. Lavrov","doi":"10.1109/DVM55487.2022.9930929","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930929","url":null,"abstract":"The problem of vibroacoustics of civil aircraft is considered, which includes a set of tasks conditionally divided into directions - cabin noise, vibrations of the structure and acoustic strength. In these areas, complex computational and experimental studies are carried out during the design of the aircraft and its fine-tuning. Using the example of the Superjet 100 aircraft, some aspects of experimental vibroacoustics are considered. The spectrum of pressure fluctuation fields on the surface of the aircraft fuselage are presented. Ranking by intensity of the main noise sources in the cabin was performed (for experimental aircraft without interior). The influence of the interior on the noise levels in the cabin is considered. An example of visualization of the sound field in the cabin using spherical beamforming technology is shown.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130418961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the Propellers Noise of Light Aircraft under Static Conditions","authors":"P. Moshkov","doi":"10.1109/DVM55487.2022.9930902","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930902","url":null,"abstract":"The paper presents the results of static tests of propellers of light aircraft AN-2, YAK-18T, MAl-223M, MAI-890, MAI-890U and F30. The characteristics of the directional noise of propellers for the first three tones when operating at elevated modes are generalized. The energy dependences of the sound power of the individual components of the propeller noise on the rotational speed are obtained. It is established that the sound power of the tonal components in the noise spectrum of the propellers decreases on average for all the investigated modes of operation of propellers with a frequency of −3. Based on this, the semiempirical model of propeller noise has been corrected. It is shown that the dominant source of propeller noise under static condition is the component from the unsteady load on the blades due to the inhomogeneity and turbulence of the incoming flow.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122443091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of Aviation Shassis Parts Construction Based on Stress Stiffness Criterion","authors":"A. Bukatyj, Stanislav Bukatyj, E. Zotov, Ramil Akhtamiyanov","doi":"10.1109/DVM55487.2022.9930892","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930892","url":null,"abstract":"At present moment in the typical strength calculations the analysis of the stress-strain state on the basis of equivalent stress and the theories of durability is used for diagnostics of parts. However a number of the basic aviation parts are working at cyclically repeated loadings are exposed to loadings and deformation in the field of a low and high cycle fatigue. In this case there is a need of the calculations of deformation conditions or the stress-strain type which significantly influence on the cyclic durability of parts. In the bound of this research was shown the necessity to use the parameter of the stress state stiffness, which was determined by the G. A. Smirnov-Alyaev criterion for strength calculating of the most loaded parts. The method for estimating of the level of tension of parts and diagnostic of the most critical zones of parts, based on dimensionless energy and complex criteria, is proposed. The effectiveness of the method, which can be used not only to diagnose critical zones, but also to optimize the geometric parameters of the design of critical parts, is shown.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122766880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On Acoustic and Vibroacoustic Characteristics of Multilayer Composite Panels","authors":"A. Y. Zverev, Valery V. Chernyh","doi":"10.1109/DVM55487.2022.9930920","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930920","url":null,"abstract":"The results of experimental studies on determining the acoustic and vibroacoustic characteristics of multilayer composite panels are presented. Four flat 3-20-mm-thick panels made of 5, 9, 12, and 34 layers of a polymer composite material (PCM) are tested in the opening between reverberation chambers. The values of the transmission loss and acoustic vibroexcitability are determined for panels excited by a diffuse sound field. The radiation loss factors into the high- and low-level chambers and the total loss factors are determined for panels excited by a vibration exciter with an impedance head mounted on it. The values of the modal density of the panels are estimated. The results are obtained in one-third octave bands in the range of 100–8000 Hz. It is shown that the acoustic and vibroacoustic characteristics of the panels have a universal character. Simple empirical relations are derived for describing these characteristics. The measured vibroacoustic characteristics of the panels made of a PCM are compared to those of a traditional stiffened fuselage panel.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124004869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}