Advances in Acoustics and Vibration最新文献_第8页

Normal Incidence Of Sound Transmission Loss From Perforated Plates With Micro And Macro Size Holes 微孔和大孔穿孔板声传输损失的正常入射

Advances in Acoustics and Vibration Pub Date : 2014-04-17 DOI: 10.1155/2014/534569

A. Putra, A. Y. Ismail

引用次数: 10

Monitoring Machines by Using a Hybrid Method Combining MED, EMD, and TKEO 利用MED、EMD和TKEO相结合的混合方法监测机器

Advances in Acoustics and Vibration Pub Date : 2014-03-20 DOI: 10.1155/2014/592080

Mourad Kedadouche, M. Thomas, Antoine Tahan

{"title":"Monitoring Machines by Using a Hybrid Method Combining MED, EMD, and TKEO","authors":"Mourad Kedadouche, M. Thomas, Antoine Tahan","doi":"10.1155/2014/592080","DOIUrl":"https://doi.org/10.1155/2014/592080","url":null,"abstract":"Amplitude demodulation is a key for diagnosing bearing faults. The quality of the demodulation determines the efficiency of the spectrum analysis in detecting the defect. A signal analysis technique based on minimum entropy deconvolution (MED), empirical mode decomposition (EMD), and Teager Kaiser energy operator (TKEO) is presented. The proposed method consists in enhancing the signal by using MED, decomposing the signal in intrinsic mode functions (IMFs) and selects only the IMF which presents the highest correlation coefficient with the original signal. In this study the first IMF1 was automatically selected, since it represents the contribution of high frequencies which are first excited at the early stages of degradation. After that, TKEO is used to track the modulation energy. The spectrum is applied to the instantaneous amplitude. Therefore, the character of the bearing faults can be recognized according to the envelope spectrum. The simulation and experimental results show that an envelope spectrum analysis based on MED-EMD and TKEO provides a reliable signal analysis tool. The experimental application has been developed on acoustic emission and vibration signals recorded for bearing fault detection.","PeriodicalId":44068,"journal":{"name":"Advances in Acoustics and Vibration","volume":"2014 1","pages":"208-217"},"PeriodicalIF":0.0,"publicationDate":"2014-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/592080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64563469","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: 25

Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid 光球在含液倾斜旋转圆柱体中的振动悬架

Advances in Acoustics and Vibration Pub Date : 2014-03-16 DOI: 10.1155/2014/608058

V. Kozlov, S. Subbotin

{"title":"Vibrational Suspension of Light Sphere in a Tilted Rotating Cylinder with Liquid","authors":"V. Kozlov, S. Subbotin","doi":"10.1155/2014/608058","DOIUrl":"https://doi.org/10.1155/2014/608058","url":null,"abstract":"The dynamics of a light sphere in a quickly rotating inclined cylinder filled with liquid under transversal vibrations is experimentally investigated. Due to inertial oscillations of the sphere relative to the cavity, its rotation velocity differs from the cavity one. The intensification of the lagging motion of a sphere and the excitation of the outstripping differential rotation are possible under vibrations. It occurs in the resonant areas where the frequency of vibrations coincides with the fundamental frequency of the system. The position of the sphere in the center of the cylinder could be unstable. Different velocities of the sphere are matched with its various quasistationary positions on the axis of rotating cavity. In tilted rotating cylinder, the axial component of the gravity force appears; however, the light sphere does not float to the upper end wall but gets the stable position at a definite distance from it. It makes possible to provide a vibrational suspension of the light sphere in filled with liquid cavity rotating around the vertical axis. It is found that in the wide range of the cavity inclination angles the sphere position is determined by the dimensionless velocity of body differential rotation.","PeriodicalId":44068,"journal":{"name":"Advances in Acoustics and Vibration","volume":"2014 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2014-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/608058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64572918","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

Numerical Study on Energy Dissipation of Steel Moment Resisting Frames under Effect of Earthquake Vibrations 地震振动作用下钢抗弯矩框架耗能的数值研究

Advances in Acoustics and Vibration Pub Date : 2014-03-13 DOI: 10.1155/2014/510593

M. Gerami, Davood Abdollahzadeh

{"title":"Numerical Study on Energy Dissipation of Steel Moment Resisting Frames under Effect of Earthquake Vibrations","authors":"M. Gerami, Davood Abdollahzadeh","doi":"10.1155/2014/510593","DOIUrl":"https://doi.org/10.1155/2014/510593","url":null,"abstract":"In the regions near to active faults, if the fault rupture propagation is towards the site and the shear wave propagation velocity is near the velocity of fault rupture propagation, the forward directivity effect causes pulse-like long-period large-amplitude vibrations perpendicular to the fault plane which causes a large amount of energy to be imposed to structures in a short time. According to previous investigations, the amounts of input and dissipated energies in the structure represent the general performance of the structure and show the level of damage and flexibility of the structure against earthquake. Therefore, in this study, the distribution of damage in the structure height and its amount at the height of steel moment frames under the pulse-like vibrations in the near fault region has been investigated. The results of this study show that the increase rate of earthquake input energy with respect to increase in the number of stories of the structure in the near field of fault is triple that in the far field of fault which then leads to a 2–2.5 times increase in the earthquake input energy in the high rise moment frames in the near field of fault with respect to that in the far field of fault.","PeriodicalId":44068,"journal":{"name":"Advances in Acoustics and Vibration","volume":"2014 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2014-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2014/510593","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64527598","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: 6

Optimization of Natural Frequencies and Sound Power of Beams Using Functionally Graded Material 用功能梯度材料优化光束的固有频率和声功率

Advances in Acoustics and Vibration Pub Date : 2014-02-20 DOI: 10.1155/2014/752361

Nabeel Alshabatat, K. Naghshineh

引用次数: 18

Effect of Two Temperatures on Reflection Coefficient in Micropolar Thermoelastic with and without Energy Dissipation Media 两种温度对微极热弹性介质反射系数的影响

Advances in Acoustics and Vibration Pub Date : 2014-02-16 DOI: 10.1155/2014/846721

Rajneesh Kumar, K. Sharma, Shaveta Garg

引用次数: 17

Analysis of Excitation and Dead Vibration Modes of Quartz Resonators 石英谐振器的激励模态和死模态分析

Advances in Acoustics and Vibration Pub Date : 2014-02-10 DOI: 10.1155/2014/746847

Zi-Gui Huang, Zheng-Yu Chen

引用次数: 0

Erratum to “Anomalous Dispersion of the S1 Lamb Mode” “S1兰姆模的异常色散”的勘误

Advances in Acoustics and Vibration Pub Date : 2014-02-04 DOI: 10.1155/2014/714298

F. Ahmad, T. Hussain

引用次数: 0

Energy Harvesting with Piezoelectric Element Using Vibroacoustic Coupling Phenomenon 利用振动声耦合现象的压电元件能量收集

Advances in Acoustics and Vibration Pub Date : 2013-12-23 DOI: 10.1155/2013/126035

H. Moriyama, Hirotarou Tsuchiya, Y. Oshinoya

引用次数: 2

Optimal Placement of Piezoelectric Plates to Control Multimode Vibrations of a Beam 控制梁多模态振动的压电片优化布置

Advances in Acoustics and Vibration Pub Date : 2013-12-17 DOI: 10.1155/2013/905160

F. Botta, D. Dini, C. Schwingshackl, L. Mare, G. Cerri

引用次数: 23