Pub Date : 2021-01-01DOI: 10.36336/akustika20214190
S. Ryzhov, T. Finochenko, A. Chukarin, I. Yaitskov
The research paper is devoted to one of the engineering characteristics of the machine tool equipment, which largely determines the safe working conditions for machine operators and competitiveness that is the sound pressure levels at workplaces. The problem of reducing noise levels to sanitary standards at the workplaces of the machine operators is relevant for mechanical engineering and has an important scientific, engineering and socio-economic significance and it corresponds to the priority and advanced scientific directions of the Strategy for scientific and technological development of the Russian Federation (part 20 g “the possibility of an effective response of the Russian society to grand challenge with the interaction of man and technology ... ”It should be noted that in this direction a number of theoretical and practical works have been carried out to reduce the noise of the universal turning, milling, and abrasive wheel grinder machines.
{"title":"MODEL VALIDATION OF THE ACOUSTIC SYSTEMS \"TOOTH WHEELS-MANDRELS\" OF THE VERTICAL GEAR GENERATOR AND GEAR SHAPING MACHINES","authors":"S. Ryzhov, T. Finochenko, A. Chukarin, I. Yaitskov","doi":"10.36336/akustika20214190","DOIUrl":"https://doi.org/10.36336/akustika20214190","url":null,"abstract":"The research paper is devoted to one of the engineering characteristics of the machine tool equipment, which largely determines the safe working conditions for machine operators and competitiveness that is the sound pressure levels at workplaces. The problem of reducing noise levels to sanitary standards at the workplaces of the machine operators is relevant for mechanical engineering and has an important scientific, engineering and socio-economic significance and it corresponds to the priority and advanced scientific directions of the Strategy for scientific and technological development of the Russian Federation (part 20 g “the possibility of an effective response of the Russian society to grand challenge with the interaction of man and technology ... ”It should be noted that in this direction a number of theoretical and practical works have been carried out to reduce the noise of the universal turning, milling, and abrasive wheel grinder machines.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176902","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}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214179
T. Germanova
As things stand today, most of acoustic studies have been focused on predicting the pattern of noise and analyzing the related factors such as various types of noise protection installations, noise transmission, housing density, building position and landscaping. At the same time, the acoustic environment studies are directly linked to the main urban structures (the so-called urban morphology) comprising the coordinated open spaces, buildings and residential areas. An important element of assessing the expected level of the environment acoustic pollution appears to be the experience of implementing planned and project documents. The given article deals with the problem of street lines [1] (red lines). These lines became widely used at designing residential and public buildings in areas adjacent to highways, urban and city-wide roads. Due to this fact the legal and technical aspects in transforming the area introduce certain difficulties. The presented article is concerned with the circumstances of applying street (red) lines in urban transportation area from the viewpoint of its acoustic impact on adjacent territories.
{"title":"IMPORTANT FACTOR IN GENERATING ACOUSTIC ENVIRONMENT WITHIN THE TERRITORIES ADJACENT TO HIGHWAYS","authors":"T. Germanova","doi":"10.36336/akustika20214179","DOIUrl":"https://doi.org/10.36336/akustika20214179","url":null,"abstract":"As things stand today, most of acoustic studies have been focused on predicting the pattern of noise and analyzing the related factors such as various types of noise protection installations, noise transmission, housing density, building position and landscaping. At the same time, the acoustic environment studies are directly linked to the main urban structures (the so-called urban morphology) comprising the coordinated open spaces, buildings and residential areas. An important element of assessing the expected level of the environment acoustic pollution appears to be the experience of implementing planned and project documents. The given article deals with the problem of street lines [1] (red lines). These lines became widely used at designing residential and public buildings in areas adjacent to highways, urban and city-wide roads. Due to this fact the legal and technical aspects in transforming the area introduce certain difficulties. The presented article is concerned with the circumstances of applying street (red) lines in urban transportation area from the viewpoint of its acoustic impact on adjacent territories.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70177252","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}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214116
P. Moshkov
The role of ambient noise in the problem of community noise of propeller-driven unmanned aerial vehicle is considered. The results of the author's measurements of the spectral characteristics of the background in open terrain, in the mountains, near the sea and the highway are presented. An expression is proposed for calculating the spectrum of background noise in open terrain (wind noise). It is shown that the ambient noise can be an effective noise masker of propeller-driven UAV in the low and medium frequencies.
{"title":"AMBIENT NOISE: PROBLEM AND STUDY IN THE FRAMEWORK OF UAV AEROACOUSTICS","authors":"P. Moshkov","doi":"10.36336/akustika20214116","DOIUrl":"https://doi.org/10.36336/akustika20214116","url":null,"abstract":"The role of ambient noise in the problem of community noise of propeller-driven unmanned aerial vehicle is considered. The results of the author's measurements of the spectral characteristics of the background in open terrain, in the mountains, near the sea and the highway are presented. An expression is proposed for calculating the spectrum of background noise in open terrain (wind noise). It is shown that the ambient noise can be an effective noise masker of propeller-driven UAV in the low and medium frequencies.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70175492","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}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214125
I. Khramtsov, V. Palchikovskiy, O. Kustov
The article considers the determination of the impedance of the acoustic liner sample on the basis of numerical simulation of physical processes in a honeycomb resonator with a grazing incidence of sound waves. The computational domain is the test section of a grazing incidence impedance tube with an acoustic liner sample. The liner sample is a single honeycomb resonator with a depth of 14 mm and an open area percent of 4.2%. Numerical simulation is performed based on the direct solution of the non-stationary compressible Navier-Stokes equations in a three-dimensional formulation. The pressure-time and velocity-time signals are recorded in the numerical simulation and processed by Dean's method and the direct method (from the ratio of acoustic pressure to normal acoustic velocity). The comparison of impedances obtained by the two methods demonstrates a good agreement with each other.
{"title":"DETERMINATION OF THE IMPEDANCE OF A HONEYCOMB RESONATOR BY DEAN’S METHOD AND DIRECT METHOD IN A COMPUTATIONAL EXPERIMENT WITH GRAZING INCIDENCE OF WAVES","authors":"I. Khramtsov, V. Palchikovskiy, O. Kustov","doi":"10.36336/akustika20214125","DOIUrl":"https://doi.org/10.36336/akustika20214125","url":null,"abstract":"The article considers the determination of the impedance of the acoustic liner sample on the basis of numerical simulation of physical processes in a honeycomb resonator with a grazing incidence of sound waves. The computational domain is the test section of a grazing incidence impedance tube with an acoustic liner sample. The liner sample is a single honeycomb resonator with a depth of 14 mm and an open area percent of 4.2%. Numerical simulation is performed based on the direct solution of the non-stationary compressible Navier-Stokes equations in a three-dimensional formulation. The pressure-time and velocity-time signals are recorded in the numerical simulation and processed by Dean's method and the direct method (from the ratio of acoustic pressure to normal acoustic velocity). The comparison of impedances obtained by the two methods demonstrates a good agreement with each other.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176189","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}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214134
K. Kuznetsov, V. Lavrov, P. Moshkov, Victor Rubanovsky
The work is devoted to the problem of designing aircraft according to the specified parameters of acoustic comfort of passengers and crew members. The initial data for the design of the aircraft are presented. The concept of acoustic design of the RRJ- 95NEW-100 aircraft based on the RRJ-95 prototype aircraft is considered. The issues of verification and validation of the calculation software used in the development of "digital twins" (acoustic simulation models) are considered, the main methods of visualization of the sound field in the aircraft cabin are presented.
{"title":"DESIGNING OF RRJ-95NEW-100 AIRCRAFT WITH REGARD TO CABIN NOISE REQUIREMENTS","authors":"K. Kuznetsov, V. Lavrov, P. Moshkov, Victor Rubanovsky","doi":"10.36336/akustika20214134","DOIUrl":"https://doi.org/10.36336/akustika20214134","url":null,"abstract":"The work is devoted to the problem of designing aircraft according to the specified parameters of acoustic comfort of passengers and crew members. The initial data for the design of the aircraft are presented. The concept of acoustic design of the RRJ- 95NEW-100 aircraft based on the RRJ-95 prototype aircraft is considered. The issues of verification and validation of the calculation software used in the development of \"digital twins\" (acoustic simulation models) are considered, the main methods of visualization of the sound field in the aircraft cabin are presented.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176756","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}
Pub Date : 2021-01-01DOI: 10.36336/akustika20214130
A. Shashurin, N. Ivanov, A. Vasilyev, Yu M Elkin, Zhenish Razakov
The method of James Lighthill is known and widely used, which allows determining the acoustic power of isothermal jets. A mathematical model for calculating the acoustic parameters (sound power, radiation pattern) of non-isothermal sound jets is proposed, taking into account the noise silencer installed in the gas exhaust tract. At the output, the equations of continuity, the amount of motion, energy, as well as the Lighthill wave equation are used. A statistical model is used as a turbulence model for calculations. A physical mechanism of noise generation by turbulent flows is proposed, which consists in considering "own" and "shear" noise. The " own " noise is caused by turbulent pulsations of the gas-dynamic flow, the "shift" noise is caused by the presence of a flow velocity gradient. Analytical dependences of the components of "own" and "shift" noise are obtained.
{"title":"CONTRIBUTION OF NON-ISOTHERMAL JETS TO THE PROCESSES OF NOISE GENERATION OF ENERGY MACHINES WHEN INSTALLING SILENCERS","authors":"A. Shashurin, N. Ivanov, A. Vasilyev, Yu M Elkin, Zhenish Razakov","doi":"10.36336/akustika20214130","DOIUrl":"https://doi.org/10.36336/akustika20214130","url":null,"abstract":"The method of James Lighthill is known and widely used, which allows determining the acoustic power of isothermal jets. A mathematical model for calculating the acoustic parameters (sound power, radiation pattern) of non-isothermal sound jets is proposed, taking into account the noise silencer installed in the gas exhaust tract. At the output, the equations of continuity, the amount of motion, energy, as well as the Lighthill wave equation are used. A statistical model is used as a turbulence model for calculations. A physical mechanism of noise generation by turbulent flows is proposed, which consists in considering \"own\" and \"shear\" noise. The \" own \" noise is caused by turbulent pulsations of the gas-dynamic flow, the \"shift\" noise is caused by the presence of a flow velocity gradient. Analytical dependences of the components of \"own\" and \"shift\" noise are obtained.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70176547","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}
Pub Date : 2020-12-15DOI: 10.36336/akustika20203767
L. Kritly, C. Glorieux, M. Rychtáriková
An overview is given of the current knowledge on the perception of the daily environment by visually impaired people by means of echolocation. Passive echolocation is discussed, as well as active echolocation based on tongue click and hiss sounds.
{"title":"INTRODUCTION TO HUMAN ECHOLOCATION: A WAY OF SEEING THE WORLD EVEN FOR VISUALLY IMPAIRED PEOPLE","authors":"L. Kritly, C. Glorieux, M. Rychtáriková","doi":"10.36336/akustika20203767","DOIUrl":"https://doi.org/10.36336/akustika20203767","url":null,"abstract":"An overview is given of the current knowledge on the perception of the daily environment by visually impaired people by means of echolocation. Passive echolocation is discussed, as well as active echolocation based on tongue click and hiss sounds.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48604292","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}
Pub Date : 2020-12-15DOI: 10.36336/akustika20203740
I. Myshchenko, Anatolii Kolhanov
Most of non-auditory effects cannot be explained as a simple consequence of noise energy influence. The level of arousal also depends on predictability of acoustic signals (level of entropy). The present article aims to analyse the contribution of noise dose and the level of entropy in non-auditory effects. 117 metallurgists and 15 healthy non-adapted to noise men were exposed to 4 different combinations of noise dose and entropy (during 8 hour working shift and 1 hour in a soundproof room correspondingly). Experiment was 2x2 factorial design. Functional state of cardiovascular and central nervous system was evaluated before and after exposure. The chosen noise characteristics account for up to 80% of the dispersion of nonspecific effects. The largest number of significant differences were between the groups, where the controlled factors were either at the lower or the upper level of variation. Noise dose and entropy contribute to such non-specific reactions as systolic/diastolic blood pressure, Stress Index, Kerdo index, duration of RR intervals, visual/hearing motion time delay. The cardiovascular system is the most sensitive to the variation of the entropy of the acoustic field.
{"title":"PECULIARITIES OF NON-AUDITORY EFFECTS OF NOISE DEPENDING ON THE DOSE AND PROCESSED AMOUNT OF ACOUSTIC INFORMATION","authors":"I. Myshchenko, Anatolii Kolhanov","doi":"10.36336/akustika20203740","DOIUrl":"https://doi.org/10.36336/akustika20203740","url":null,"abstract":"Most of non-auditory effects cannot be explained as a simple consequence of noise energy influence. The level of arousal also depends on predictability of acoustic signals (level of entropy). The present article aims to analyse the contribution of noise dose and the level of entropy in non-auditory effects. 117 metallurgists and 15 healthy non-adapted to noise men were exposed to 4 different combinations of noise dose and entropy (during 8 hour working shift and 1 hour in a soundproof room correspondingly). Experiment was 2x2 factorial design. Functional state of cardiovascular and central nervous system was evaluated before and after exposure. The chosen noise characteristics account for up to 80% of the dispersion of nonspecific effects. The largest number of significant differences were between the groups, where the controlled factors were either at the lower or the upper level of variation. Noise dose and entropy contribute to such non-specific reactions as systolic/diastolic blood pressure, Stress Index, Kerdo index, duration of RR intervals, visual/hearing motion time delay. The cardiovascular system is the most sensitive to the variation of the entropy of the acoustic field.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41797587","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}
Pub Date : 2020-12-15DOI: 10.36336/akustika2020378
Š. Hardoň, J. Kúdelčík
Magnetic fluids with nanoparticles dispersed in water or oils offer attractive applications in biomedicine and industry. Biocompatible magnetic fluids are used for diagnostics and therapy in medical applications, in pharmacy, and biosensors. Application of ferrofluids is expanding into energy conservation, faster and efficient cooling, and hence better performance in a wide variety of practical applications (in heat exchangers, mainly in micro-cooling systems). For the study of the influence of an external magnetic field on the aggregation processes of magnetic nanoparticles in magnetic fluids, acoustic spectroscopy was used. The jump changes of the magnetic flux density at various temperatures influenced the acoustic attenuation. The measured changes were results of nanoparticle aggregations into new structures.
{"title":"INFLUENCE OF MAGNETIC NANOPARTICLES ON ACOUSTIC ATTENUATION IN LIQUIDS","authors":"Š. Hardoň, J. Kúdelčík","doi":"10.36336/akustika2020378","DOIUrl":"https://doi.org/10.36336/akustika2020378","url":null,"abstract":"Magnetic fluids with nanoparticles dispersed in water or oils offer attractive applications in biomedicine and industry. Biocompatible magnetic fluids are used for diagnostics and therapy in medical applications, in pharmacy, and biosensors. Application of ferrofluids is expanding into energy conservation, faster and efficient cooling, and hence better performance in a wide variety of practical applications (in heat exchangers, mainly in micro-cooling systems). For the study of the influence of an external magnetic field on the aggregation processes of magnetic nanoparticles in magnetic fluids, acoustic spectroscopy was used. The jump changes of the magnetic flux density at various temperatures influenced the acoustic attenuation. The measured changes were results of nanoparticle aggregations into new structures.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48009865","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}
Pub Date : 2020-12-15DOI: 10.36336/akustika20203714
Peter Hockicko, Gabrieal Tarjányiová
This paper deals with the using of interactive acoustic experiments in teaching from the lowest levels of the education system, motivation and stimulation into science, physics and acoustics from early childhood. Initial playful experimentation is usually a stimulating factor that will later motivate students to analyse and evaluate higher cognitive goals according to Bloom's taxonomy in their studies at the technical universities. Recording of sounds followed by frequency analysis, investigation of oscillate solid, Chladni's pictures, Kund's tube, Helmholtz resonator and other acoustic experiments are very useful and illustrative not only for students at a technical university but they can also help in building basic ideas about the propagation of sound in children attending the primary school. The Children's University of Žilina every year in summer time try to increase the education level of the nation with the emphasis especially on the young people to show the research and development importance for the future improvement of the society.
{"title":"LAB-BASED LEARNING IN UNIVERSITY FOR PRIMARY SCHOOL STUDENTS FOCUSED ON ACOUSTICS","authors":"Peter Hockicko, Gabrieal Tarjányiová","doi":"10.36336/akustika20203714","DOIUrl":"https://doi.org/10.36336/akustika20203714","url":null,"abstract":"This paper deals with the using of interactive acoustic experiments in teaching from the lowest levels of the education system, motivation and stimulation into science, physics and acoustics from early childhood. Initial playful experimentation is usually a stimulating factor that will later motivate students to analyse and evaluate higher cognitive goals according to Bloom's taxonomy in their studies at the technical universities. Recording of sounds followed by frequency analysis, investigation of oscillate solid, Chladni's pictures, Kund's tube, Helmholtz resonator and other acoustic experiments are very useful and illustrative not only for students at a technical university but they can also help in building basic ideas about the propagation of sound in children attending the primary school. The Children's University of Žilina every year in summer time try to increase the education level of the nation with the emphasis especially on the young people to show the research and development importance for the future improvement of the society.","PeriodicalId":42295,"journal":{"name":"Akustika","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44213691","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}
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