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

{"title":"Application of Finite Element Modeling to the Problem of Determining Hydrodynamic Noise Generated by Local Inhomogeneity","authors":"A. Suvorov, V. Eremeev, S.G. Zaitseva, N.V. Balakireva","doi":"10.1109/DVM55487.2022.9930911","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930911","url":null,"abstract":"Determining the hydrodynamic noise that occurs when various inhomogeneities of a body flow around a fluid is one of the most urgent problems of acoustics. The report presents a finite element method for determining the hydrodynamic noise, developed at the IAP RAS and implemented in the software “CATEC”. This method is based on the numerical solution of the Helmholtz equations in combination with boundary conditions on the scattering surface of the body and at infinity, which makes it possible to eliminate the most significant disadvantages of integral methods. The main disadvantages of integral methods are the inability to take into account the elasticity of a streamlined body, as well as re-reflection from a part of the body outside the control surface. Acoustic radiation in this case is defined as the result of the scattering of the pseudosonic field of turbulent sources on the surface of the body, which are the Lighthill tensor. The purpose of the report is to validate the method on the basis of experimental data on the noise emission of a cavity streamlined by an air flow, as well as to compare the results obtained with the solution by the integral FW-H method. The specificity of the problem is the noise of non-physical turbulence generated at the input boundary in the hydrodynamic part of the problem, and the need to filter it.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"233 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":"122222497","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":"Revealing Parameters of Hidden Periodicities by Parametric DFT Method in Functional Diagnostics of Machines and Mechanisms","authors":"Ponomarev Alexey, Ponomareva Olga, Smirnova Natalia","doi":"10.1109/DVM55487.2022.9930914","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930914","url":null,"abstract":"The purpose of the study is to develop a new method for monitoring the technical condition and functional diagnostics of machines and mechanisms for various purposes based on the spectral analysis of the vibroacoustic signal generated by them. The developed new method for monitoring the technical condition and functional diagnostics of machines and mechanisms for various purposes is based on a generalization of classical discrete Fourier transform (DFT) in the form of parametric DFT (DFT-P). The paper reveals and formulates the problems that arise when using the classical DFT to identify the parameters of hidden periodicities in a vibroacoustic signal generated by machines and mechanisms for various purposes. These are the aliasing effect, the scalloping effect, the picket fence effect. The advantages of DFT-P over DFT in solving the fundamental problems of dynamics and vibroacoustics, solving the problems of noise and vibration are studied in detail. Theoretical foundations for measuring the parameters of a discrete harmonic signal based on parametric discrete Fourier transform have been developed. The reasons for the occurrence of non-invariance of the energy spectrum of a discrete harmonic signal given on a finite interval are investigated by the method of parametric discrete Fourier transform. A technique for determining (estimating) the errors in measuring the amplitude of a harmonic signal by the method of parametric discrete Fourier transform is proposed. An experimental verification of the theoretical results obtained in the work on revealing the parameters of hidden periodicities by parametric DFT method in the functional diagnostics of machines and mechanisms using a vibroacoustic signal was carried out by numerical simulation.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"173 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":"124219041","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":"Measurement of Dynamic Characteristics of Structures by the Speckle Interferometry on Single Speckle","authors":"M. D. Limov, M. N. Osipov, R. N. Sergeev","doi":"10.1109/DVM55487.2022.9930891","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930891","url":null,"abstract":"- In this article the results associated with the use of speckle interferometry on a single speckle to determine the dynamic characteristics of mechanical constructions are presented. The optical scheme of the speckle interferometer on a single speckle is proposed, which makes it possible to simultaneously record the form and amplitude of the resonant vibrations of mechanical constructions. Theoretical and experimental results demonstrating the behavior of the output signals from the speckle interferometer on a single speckle in the study of the resonant vibrations are presented. The resonance method for measuring the logarithmic decrement of vibrations and other dynamic characteristics of a mechanical constructions using speckle interferometry on a single speckle is proposed.","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":"130751355","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 the Recalculation of the Results of Laboratory and Static Tests of Propeller-Driven Power Plants on with Flight Conditions","authors":"P. Moshkov","doi":"10.1109/DVM55487.2022.9930927","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930927","url":null,"abstract":"The problem of recalculation of the results of laboratory and static tests of propeller-driven power plants on with flight conditions is considered. The paper presents a comparative analysis of the acoustic characteristics of the AN-2, YAK-18T and MAI-223M light propeller-driven airplanes obtained in flight and static conditions. Also in the work, the results of laboratory acoustic tests in the presence of an incoming flow of the Ptero-GOVAV were compared with the data of the in-flight experiment. The measurement results are reduced to one distance.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"4 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":"133338731","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":"Software for Research of Acoustic Characteristic of Power Plants on the Basis of Discrete-Time Model","authors":"A. Vasilyev","doi":"10.1109/DVM55487.2022.9930908","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930908","url":null,"abstract":"Noise generated during power plants operation may reach intensive levels and may cause illnesses of population and industrial workers. In order to reduce efficiently noise radiation it is necessary to calculate power plant acoustic characteristic. Software was developed allowing calculate sound transmission and radiation in pipelines of power plants by using of discrete-time model. Simulation of sound propagation in pipeline is carried out by using of wide number of acoustic elements (source, emitter, conductor etc.). By using of the software it is possible to calculate the efficiency of noise reduction by using visualization instruments (sound spectrum analyzer, oscilloscope etc.) in set up control points. Examples of realization of software are shown.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"323 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":"124569968","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":"Finite element modeling of noise emission in mechanoacoustic systems with rotating subdomains","authors":"A. Suvorov, E. M. Sokov, V.A. Sharagina","doi":"10.1109/DVM55487.2022.9930863","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930863","url":null,"abstract":"Vibroactive mechanisms often contain rotating elements that determine their acoustic characteristics. Existing numerical methods make it possible to calculate the acoustics of such rotating systems exclusively in the time domain, while these methods require large computing power and accumulate a calculation error with each subsequent time step. In this paper, a numerical method that allows modeling of the noise emission of rotating mechanoacoustic systems in the frequency domain has been developed. The method is based on the separation of rotating and stationary subdomains from the computational domain and combining them into a single finite element model using a special contact interface that considers the circumferential sliding of the finite element mesh. The method enables one to predict sound emission both at the main frequency of the source and at frequencies that are multiples of the rotation frequency of the elastic body. The method is verified on simple analytical models.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"3 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":"117102672","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 Dynamic Wear at the Jet Nozzle Shutters Synchronization System Elements","authors":"A. Gvozdev, V. S. Melentjev, I. Ibatullin","doi":"10.1109/DVM55487.2022.9930919","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930919","url":null,"abstract":"This study is aimed at increasing of durability by the synchronization system of gas turbine engine nozzle exit. The analysis of in-service environment and elements design features of the jet nozzle shutters synchronization system in area of contact between the slider and the upper guide plate were complied with. To assess the dynamic wear of elements, a finite element model was created. Strength calculations were performed under the conditions of contact interaction and oscillatory loads. The simulation results of the slider behavior were verified experimentally. The tests involved sliders of different geometric forms and different coatings, selected by accordance with principles of frictional compatibility. It was meant to due to dynamic wear, a characteristic type of destruction of elements contact surfaces of the jet nozzle shutters synchronization system is frettage, accompanied by fatigue spalling of the friction surfaces in the form of pitting. Recommendations for optimizing of the slider's geometry and the using of hard anti-friction coatings are given.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"43 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":"130030169","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":"Device of Active Noise Control in Duct of Power Plant with Increased Protection","authors":"A. Vasilyev","doi":"10.1109/DVM55487.2022.9930916","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930916","url":null,"abstract":"Low frequency noise generated in ducts during power plants operation may achieve significant values and may cause serious health problems of population and industrial staff. Active noise control is a promising method for low frequency noise reduction, but in conditions of exploitation of active noise control devices in industry, transport etc. the problem of influence of external factors to the efficiency, reliability and durability of active noise control devices is arising. Factors influencing to the operation of active noise control devices are analyzed. New device of active noise control in duct with improved protection is suggested. Construction and principle of operation of device are described. For the purposes of protection from negative impact of external sources (like temperature, humidity, masking interferences of other noise sources etc.) the elements of generation and of correction of active sound source with required acoustical characteristic are placed in proof housing in which also additional pressure sensor is installed. Such construction of device is giving the possibility of it efficient operation and low frequency noise reduction in different conditions of exploitation.","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":"130641534","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":"Numerical Simulation of High-Temperature Gas Flow Rate Control Valve with Laval Structure by Fluid-thermal-structure Coupling","authors":"Yayun Zhang, Jinghui Peng, Songjing Li","doi":"10.1109/DVM55487.2022.9930890","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930890","url":null,"abstract":"High-temperature gas flow rate control valve (GFRCV) with Laval structure is the core component of gas control system. The influence of fluid-thermal-structure (FTS) coupling deformations on the characteristics of GFRCV is a noteworthy issue. In this work, numerical simulations by two-way FTS coupling method and single computational fluid dynamics (CFD) method are conducted to analyze the velocity distribution, pressure distribution, deformations and flow characteristics of GFRCV with Laval structure. Variation regularities of velocity, pressure, and flow characteristics calculated by two-way FTS coupling method are more in line with the actual working conditions in consideration of the influence of FTS coupling deformations on flow characteristics, which reveals that two-way FTS coupling numerical calculations are more meaningful in engineering application.","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":"122270500","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":"Designing a jaw implant made of polyether-ether-ketone (PEEK) material taking into account anisotropy of mechanical properties caused by the application of additive technologies","authors":"I. Bajrikov, A. Bukatyj, Dmitry Evdokimov, A. Bajrikov, A. Ushakov, A. Nikolaenko","doi":"10.1109/DVM55487.2022.9930917","DOIUrl":"https://doi.org/10.1109/DVM55487.2022.9930917","url":null,"abstract":"The analysis of domestic and foreign literature has shown that modern maxillofacial surgery is in search of a solution to the problems of restoring the volume of bone tissue in defects resulting from the surgical treatment of patients with post-traumatic deformities, neoplasms, ankylosis of the temporomandibular joint, and this task is one of the most complex and relevant in modern maxillofacial surgery. Clinical and experimental work is carried out using both biological materials (carrying out auto-, allo-, xenoplasty, transplantation of bone and cartilage tissue), and non-biological (from metals and polymers). Traditionally, titanium metal structures are used for this purpose both by themselves and in combination with various types of grafts. Modern maxillofacial surgery not only explores and applies traditionally used bone grafts in clinical practice, but also expanded the search for biologically inert new materials. However, so far there are no studies containing a comprehensive analysis of the use of methodological techniques and evidence-based conclusions about the best ways to eliminate defects in the lower jaw, depending on their etiology, extent, localization, and stages of treatment. Constructs created on the basis of new technologies in maxillofacial surgery should play a significant role in the restoration of function, while possessing high ergonomics and bioadaptation. In this work, studies were carried out on the mechanical properties of the PEEK material, which is increasingly used in the field of medicine in the manufacture of implants. A feature of these studies is the fact that samples printed on a 3D printer were tested. Research on topics is especially relevant because, due to the complexity of the configuration of the geometry of human bone elements, the geometry of implants has a corresponding complexity of geometry, so it is rational to use 3D printing in their manufacture. Based on the results of the work carried out, recommendations were made that will allow optimizing any structure made of PEEK material using the 3D printing method in terms of strength.","PeriodicalId":227980,"journal":{"name":"2022 International Conference on Dynamics and Vibroacoustics of Machines (DVM)","volume":"41 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":"126091222","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}