发布求助
文献互助 智能选刊 最新文献

Akustika最新文献

筛选
英文 中文
THE USE OF THE HILBERT HUANG TRANSFORMATION IN THE TESTING OF RAILWAY STRUCTURES 希尔伯特黄变换在铁路结构试验中的应用
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika20214029
J. Smutný, Dušan Janoštík, Viktor Nohál
{"title":"THE USE OF THE HILBERT HUANG TRANSFORMATION IN THE TESTING OF RAILWAY STRUCTURES","authors":"J. Smutný, Dušan Janoštík, Viktor Nohál","doi":"10.36336/akustika20214029","DOIUrl":"https://doi.org/10.36336/akustika20214029","url":null,"abstract":"The aim of the paper is to introduce a less used method for the evaluation of non-stationary and especially transient phenomena in railway structures to the wider professional public. This method may find wide application in many technical and other fields. It is the so-called Hilbert-Huang transform. In this paper, its application in the study of dynamic phenomena occurring in a selected superstructure structure is shown. The calculation procedure of the presented transform differs from traditional tools, which include, for example, the short-term Fourier transform or the Wavelet transform. The paper includes a mathematical analysis and description of this transformation. Furthermore, the paper contains a description of the measurement method used, a discussion of the results obtained and recommendations for practice.","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":"70174581","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}
引用次数: 0
ANALYSIS OF METHODS AND PRESENTATION OF RESULTS OF EXPERIMENTAL RESEARCH OF LOW FREQUENCY GAS DYNAMIC PULSATIONS IN PIPELINES OF POWER PLANTS 电厂管道低频气体动力脉动实验研究方法分析及结果介绍
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika202141200
A. Vasilyev
{"title":"ANALYSIS OF METHODS AND PRESENTATION OF RESULTS OF EXPERIMENTAL RESEARCH OF LOW FREQUENCY GAS DYNAMIC PULSATIONS IN PIPELINES OF POWER PLANTS","authors":"A. Vasilyev","doi":"10.36336/akustika202141200","DOIUrl":"https://doi.org/10.36336/akustika202141200","url":null,"abstract":"The results of analysis of Russian approaches and of experience of development of methods and of results of experimental research of low-frequency gas dynamic pressure pulsations in pipelines of power plants are described. Peculiarities of Russian standards and of the sanitary norms are considered. According to results of experimental researches is possible to conclude that the maximal vibration levels are observed on the frequencies 31,5 Hz and 40 Hz. The same results were obtained during the measurements of sound pressure level on the same experimental compressor mount. Earlier during the experiments on the same mount it was achieved that the maximal values of low frequency gas pressure pulsations are observed on the frequency 35 Hz. Thus, it was experimentally shown that gas pressure pulsations are making the main contribution into forming of low frequency sound and vibration of compressor mount.","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":"70175995","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}
引用次数: 0
APPROACHES TO CLASSIFICATION OF REDUCTION METHODS OF LOW FREQUENCY NOISE AND VIBRATION OF POWER PLANTS 电厂低频噪声与振动降噪方法分类探讨
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika20214152
A. Vasilyev
{"title":"APPROACHES TO CLASSIFICATION OF REDUCTION METHODS OF LOW FREQUENCY NOISE AND VIBRATION OF POWER PLANTS","authors":"A. Vasilyev","doi":"10.36336/akustika20214152","DOIUrl":"https://doi.org/10.36336/akustika20214152","url":null,"abstract":"The importance of the problem of low-frequency noise and vibration reduction now may be considered as urgent. Increased influence of low-frequency noise and vibration may cause both human health problems and equipment damage. Power plants (internal combustion engines, compressors, heat-exchanges etc.) are one of the main low-frequency noise and vibration sources. The principles of classification of methods of power plants low-frequency noise and vibration reduction are suggested. Author is proposing energetic approach, according of which all the methods and arrangements of reduction may be classified as passive (adaptive and non-adaptive), active and hybrid passive-active. The classification is illustrated by the different examples, including constructions of mufflers and dampers, some of which are developed by author.","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":"70176887","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}
引用次数: 2
EXPERIMENTAL STUDY OF DYNAMIC PARAMETERS OF COMPLEX PIPELINE SYSTEM 复杂管道系统动态参数的实验研究
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika20214165
A. Sekacheva, L. Pastukhova, A. Noskov
{"title":"EXPERIMENTAL STUDY OF DYNAMIC PARAMETERS OF COMPLEX PIPELINE SYSTEM","authors":"A. Sekacheva, L. Pastukhova, A. Noskov","doi":"10.36336/akustika20214165","DOIUrl":"https://doi.org/10.36336/akustika20214165","url":null,"abstract":"The article discusses the results of studies of the dynamic parameters of a pipeline connected to a pump, carried out in order to obtain data in full-scale conditions. At this stage of the study, the stationary process of the pump operation, which forms a turbulent flow in the pipeline, was studied. A computational and experimental technique for studying natural frequencies and vibration modes of pipelines of complex spatial configuration has been developed. The adequacy of the developed methods of finite element modeling of dynamic processes in pipeline systems in the frequency range up to 400 Hz has been confirmed.","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":"70177191","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}
引用次数: 1
THEORETICAL STUDY OF THE CLOSED BAR LOOS FACTOR 闭式杆流系数的理论研究
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika2021418
V. Krutova, B. Meskhi
{"title":"THEORETICAL STUDY OF THE CLOSED BAR LOOS FACTOR","authors":"V. Krutova, B. Meskhi","doi":"10.36336/akustika2021418","DOIUrl":"https://doi.org/10.36336/akustika2021418","url":null,"abstract":"The coefficient of vibrational energy loss is a physical and mechanical characteristic, the accuracy of calculation of vibroacoustic characteristics of corresponding machines at the stage of their design to a great extent depends on its value.","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":"70177260","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}
引用次数: 0
NOISE REDUCTION AT WORKPLACE IN CONSTRUCTION 减少建筑工地的噪音
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika20214194
M. Butorina, N. Ivanov, Alisa Troshchinina
{"title":"NOISE REDUCTION AT WORKPLACE IN CONSTRUCTION","authors":"M. Butorina, N. Ivanov, Alisa Troshchinina","doi":"10.36336/akustika20214194","DOIUrl":"https://doi.org/10.36336/akustika20214194","url":null,"abstract":"Construction machinery is one of the most common noise sources in the environment and at the workplace. In Russia about 40% of all occupational injuries and 40% of the loss of working capacity are recorded at the construction sites. The noise levels at the operator’s position exceeds noise limits up to 40 dBA. However, personal hearing protection recommended in Russia can not provide sufficient noise reduction. To reduce construction noise administrative and engineering controls, substitution of noise with the standardization of noise emissions and replacing of noisier equipment with quieter items can be recommended. Administrative measures of noise reduction include reduction of work time, training and audiometric testing. To elaborate engineering controls a method of separation of noise sources with mathematical modelling was proposed. Basing on this method the most effective noise reduction measures were proposed that helped to reduce noise in the cabin of a backhoe by 6-7 dBA.","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":"70176961","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}
引用次数: 1
ANALYSIS OF THE FACTORS DECREASING THE EFFICIENCY OF OPERATION OF ACTIVE NOISE AND VIBRATION CONTROL SYSTEMS IN DUCTS AND THE WAYS OF IMPROVEMENT OF PROTECTION 分析了影响管道噪声振动主动控制系统运行效率的因素及改进措施
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika202141205
A. Vasilyev
{"title":"ANALYSIS OF THE FACTORS DECREASING THE EFFICIENCY OF OPERATION OF ACTIVE NOISE AND VIBRATION CONTROL SYSTEMS IN DUCTS AND THE WAYS OF IMPROVEMENT OF PROTECTION","authors":"A. Vasilyev","doi":"10.36336/akustika202141205","DOIUrl":"https://doi.org/10.36336/akustika202141205","url":null,"abstract":"The factors influencing on the active noise and vibration control system efficiency of operation and the ways of the system protection improvement are discussed. Analysis of factors decreasing the efficiency of operation of active noise and vibration control systems in ducts is showing that there are such factors as physical characteristics of operating medium (temperature, pressure, moisture, vibrations, dust), masking acoustic and vibrating interferences of other sources of noise and vibration etc., which may significantly reduce the efficiency, reliability and durability of active systems operation. The ways of improvement of protection of the elements of the active noise and vibration control system are discussed. Further improvement of active noise control and vibration system elements protection allows the system to operate with higher efficiency and reliability. Widely, achieving of good results in the solution of this problem helps us to extend the possibilities of active noise and vibration control systems practical application.","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":"70176117","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}
引用次数: 0
COMPREHENSIVE ASSESSMENT OF THE IMPACT OF AIR NOISE AND DUST ON FOUNDRY OPERATORS 综合评价空气噪声、粉尘对铸造作业人员的影响
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika20214140
L. Drozdova, V. Manokhin, E. Golovina, Alexander Kudaev
{"title":"COMPREHENSIVE ASSESSMENT OF THE IMPACT OF AIR NOISE AND DUST ON FOUNDRY OPERATORS","authors":"L. Drozdova, V. Manokhin, E. Golovina, Alexander Kudaev","doi":"10.36336/akustika20214140","DOIUrl":"https://doi.org/10.36336/akustika20214140","url":null,"abstract":"The main goal of the work is a comprehensive assessment of the impact of noise and dust in the foundry. Based on the results of the analysis, the main disadvantage areas with exceeding the permissible noise and dust level are presented – areas of knockout grates and casting cleaning areas. Recommendations are proposed for the selection of technical measures, including the rational placement of equipment, their mode of operation, the installation of acoustic screens and sound-insulating partitions near unprotected workplaces, as well as a rational selection of the equivalent sound absorption area of the workshop premises, which will create safe production conditions. Ways of improving the working conditions of operators of sand and shot blasting installations by reducing noise at their workplaces are considered: increasing sound absorption in the body of the shot blasting chamber and installing noise-protective shielding structures to fence off areas with the most intense noise.","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":"70176747","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}
引用次数: 0
MODEL VALIDATION OF THE ACOUSTIC SYSTEMS "TOOTH WHEELS-MANDRELS" OF THE VERTICAL GEAR GENERATOR AND GEAR SHAPING MACHINES 立式齿轮发生器和插齿机“齿轮-心轴”声学系统的模型验证
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika20214190
S. Ryzhov, T. Finochenko, A. Chukarin, I. Yaitskov
{"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}
引用次数: 0
THEORETICAL ANALYSIS ON REGULARITIES OF THE PROCESS OF NOISE GENERATION OF PLANING, SLOTTING AND PLANING-MILLING MACHINES 刨、插、刨铣床噪声产生过程规律的理论分析
Akustika Pub Date : 2021-01-01 DOI: 10.36336/akustika202141173
A. Chukarin, B. Meskhi, David Shoniya
{"title":"THEORETICAL ANALYSIS ON REGULARITIES OF THE PROCESS OF NOISE GENERATION OF PLANING, SLOTTING AND PLANING-MILLING MACHINES","authors":"A. Chukarin, B. Meskhi, David Shoniya","doi":"10.36336/akustika202141173","DOIUrl":"https://doi.org/10.36336/akustika202141173","url":null,"abstract":"The acoustic characteristics of the planing machines, which are the most widespread and the most noisy metalworking equipment, are considered. The article presents the theoretical models of the process of noise generation of planing, slotting and planing-milling machines. Regularities of sound pressure levels and sound power are obtained for brittle materials (cast iron blanks) mounted on the machine table. The regularities of the vibration velocities of the cutting tool and the workpiece are derived. The system of second-order differential equations is obtained for the version of the cantilever fixing of the planing cutter, using the developed approaches to the calculating vibrations and noise of machine equipment.","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":"70175810","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}
引用次数: 2
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信