International Journal of Acoustics and Vibration最新文献_第9页

Extra Edge Damping as a Way to Improve Sound Insulation of Window Structures 提高窗结构隔声性能的额外边缘阻尼方法

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/ijav.2018.23.11286

Aleksey Nikolaevich Puzankov, Dmitry Lvovich Shchegolev, V. A. Tishkov, V. N. Bobylev

引用次数: 2

Design Considerations and Establishment of a Low Frequency Hydrophone Calibration Setup using the Principle of Vibrating Water Column 基于振动水柱原理的低频水听器标定装置的设计与建立

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/IJAV.2018.23.11102

A. Malarkodi, G. Latha, P. Sridhar, N. Bøgholm

{"title":"Design Considerations and Establishment of a Low Frequency Hydrophone Calibration Setup using the Principle of Vibrating Water Column","authors":"A. Malarkodi, G. Latha, P. Sridhar, N. Bøgholm","doi":"10.20855/IJAV.2018.23.11102","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11102","url":null,"abstract":"This paper describes the design and implementation of a low frequency hydrophone calibration system, using a vibrating water column. The hydrophone to be calibrated is immersed in the water column and the position of the transducer is kept constant while a hydrodynamic pressure field is generated in the water column by means of a shaker (similar to what is described in IEC 60565). F. Schloss et al. used a vibrating water column for hydrophone calibration in the frequency range from 10 Hz to 700 Hz.1 An interlaboratory comparison calibration was carried out by the Russian Metrological Institute of Technical Physics and Radio Engineering (VNIIFTRI) and Hangzhou Applied Acoustics Research Institute (HAARI) in the frequency range from 250 Hz to 1 kHz.2 The dimensions of the test vessel are important for deciding the frequency range of operation. Simulations were carried out for the selection of vessel material and dimension. To overcome limitations in the frequency range caused by resonance in the water column, the principle of operation was modified from absolute calibration to calibration by comparison. By using a single cylindrical vessel, the frequency range is extended to cover frequencies from less than 100 Hz to 1 kHz. The calibrated reference hydrophone type Bruel & Kjaer (B&K) 8104 is used in this calibration. Some results obtained from the use of the calibration system are also presented in this paper. 1","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Efficient Model for Acoustic Attenuators using the Method of Fundamental Solutions 基于基本解方法的声衰减器有效模型

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/IJAV.2018.23.11148

E. Costa, L. Godinho, J. Santiago, W. Mansur

引用次数: 1

Active-suspension Design for a Special Road-Rail Vehicle Based on Vehicle-Track Coupled Model Using Genetic Algorithm 基于遗传算法车轨耦合模型的某型公路轨道车辆主动悬架设计

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/IJAV.2018.23.11063

R. Talebitooti, R. Bayat

引用次数: 0

Evaluation of Psychoacoustic Annoyance and Perception of Noise Annoyance Inside University Facilities 大学设施内心理声烦恼与噪声烦恼感知评价

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/IJAV.2018.23.11059

E. Hernández, I. García, Juan Manuel López Navarro, I. Campos-Cantón, E. Kolosovas-Machuca

引用次数: 16

Vibration Analysis of Elastic Beams With Unconstrained Partial Viscoelastic Layer 无约束部分粘弹性层弹性梁的振动分析

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/ijav.2018.23.11138

Amirali Sadeqi, S. Moradi

{"title":"Vibration Analysis of Elastic Beams With Unconstrained Partial Viscoelastic Layer","authors":"Amirali Sadeqi, S. Moradi","doi":"10.20855/ijav.2018.23.11138","DOIUrl":"https://doi.org/10.20855/ijav.2018.23.11138","url":null,"abstract":"Material damping treatments, such as adding viscoelastic layers (VEL) to engineered structures, are commonly used for vibration attenuation. Study of the VEL geometry, shape, location (in case of partially adding), and arrangement (in composites), are of engineering interest to optimize the damping effect versus the weight and cost. In order to show the possibility of higher damping characteristics for shorter VEL, this paper aims for a two-step vibration analysis of an elastic cantilever beam with an unconstrained partial VEL. The governing equations are developed based on Euler-Bernoulli beam theory and Kelvin-Voigt viscoelastic model. In order to answer how the VEL length and thickness affect the modal parameters and dynamic response, both free and forced vibration problems are solved analytically, and the results are manipulated to achieve a much more applicable size range with higher damping characteristic. A non-uniform trend and inconsistent behaviour in both frequency and amplitude changes is observed versus increasing the VEL length, which addresses the necessity of an optimization challenge and gives a good insight to take into account the concept of VEL critical length.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Modal Density of Honeycomb Sandwich Composite Cylindrical Shells Considering Transverse Shear Deformation 考虑横向剪切变形的蜂窝夹层复合材料圆柱壳模态密度

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/IJAV.2018.23.11241

S. J. K. Florence, K. Renji, K. Subramanian

{"title":"Modal Density of Honeycomb Sandwich Composite Cylindrical Shells Considering Transverse Shear Deformation","authors":"S. J. K. Florence, K. Renji, K. Subramanian","doi":"10.20855/IJAV.2018.23.11241","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11241","url":null,"abstract":"Honeycomb sandwich shells with composite face sheets are of extensive use in the spacecraft industry. Information on the number of resonant modes present in a frequency band is required to study their response behaviour under acoustic excitation. Modal densities of thin composite cylindrical shells have been reported while transverse shear deformations have not been considered. But in honeycomb sandwich panels, transverse shear deformations are significant, especially at higher order modes of vibration. In this work expressions for natural frequency and modal density of composite cylinders incorporating transverse shear deformation are derived. The modal densities of a typical cylinder that are obtained using the derived expression are compared with the results obtained using the finite element method and they are similar. Effects of transverse shear and orthotropic nature of the face sheets on the modal densities are investigated. It is shown that computing the modal density of honeycomb sandwich cylinders without considering the transverse shear deformation can lead to significant errors at high frequencies. Expressions of modal densities for special cases are also derived from the general expression.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Estimation of Viscous Damping Parameters of Fibre Reinforced Plastic Plates using Finite Element Model Updating 基于有限元模型修正的纤维增强塑料板粘滞阻尼参数估计

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2018-01-01 DOI: 10.20855/IJAV.2018.23.11064

S. Mondal, S. Chakraborty

{"title":"Estimation of Viscous Damping Parameters of Fibre Reinforced Plastic Plates using Finite Element Model Updating","authors":"S. Mondal, S. Chakraborty","doi":"10.20855/IJAV.2018.23.11064","DOIUrl":"https://doi.org/10.20855/IJAV.2018.23.11064","url":null,"abstract":"A combined numerical-experimental technique has been implemented using the finite element model updating technique to estimate a set of proportional viscous damping parameters for determining the global responses of fibre reinforced plastic (FRP) plates over a chosen frequency range of interest. The experimentally determined frequencies and mode shapes are used to update the homogenised anisotropic in-plane material constants, before estimating the damping parameters from the directly observed frequency response functions (FRFs). Gradient based inverse sensitivity method has been implemented for the parameter estimation. Existing FRP structures may degrade considerably due to environmental effects over the long period of existence—changing the material and damping properties significantly compared to their initial values after fabrication—thus requiring updating. The estimated viscous damping parameters using the current technique reproduces higher values of modal damping factors for FRP plates. For nonviscous damping, estimation of a set of relaxation factors produces a more realistic estimate of modal damping factors. Increased value of the relaxation factors make the model coincide with the viscous one. A numerically simulated plate problem has been presented along with the experimental validation.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"23 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67722474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fundamental Study of Momentum Exchange Impact Damper Using Pre-straining Spring Mechanism 基于预紧弹簧机构的动量交换冲击阻尼器的基础研究

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2017-12-01 DOI: 10.20855/IJAV.2017.22.4487

L. Son, M. Bur, M. Rusli, H. Matsuhisa, Keisuke Yamada, H. Utsuno

引用次数: 7

Parametric Excitation of Vibrations in Printing Machines 印刷机振动的参数激励

IF 1 4区工程技术

International Journal of Acoustics and Vibration Pub Date : 2017-12-01 DOI: 10.20855/ijav.2017.22.4490

M. Messer

{"title":"Parametric Excitation of Vibrations in Printing Machines","authors":"M. Messer","doi":"10.20855/ijav.2017.22.4490","DOIUrl":"https://doi.org/10.20855/ijav.2017.22.4490","url":null,"abstract":"In this paper the parametric excitation of vibrations in printing machines is analysed both experimentally and theoretically. Initially, selected results from experimental studies of these drive-belt-induced torsional vibrations are discussed. For this, twelve different drive belts are used during experiments at a test rig and at a sheet-fed offset printing machine. Measured vibration amplitudes from machine and test rig correlate very well. Depending on the chosen drive belt, large vibration amplitudes occur during printing in the vicinity of a critical production speed, where the first drive belt order coincides with the machine’s first eigenfrequency. This results in a clearly visible rhythm during printing and is therefore unacceptable. It is demonstrated experimentally, that active vibration control can be used successfully to reduce these parametrically excited torsional vibrations in sheet-fed offset printing machines. Furthermore, the machine is modelled as a dynamical multi-degree of freedom system with time-periodic coefficients, and the parametric excitation of torsional vibrations is studied numerically. First, a numerical stability analysis is carried out employing Floquet theory. The system’s damping parameters are derived from measured machine data. Accordingly, a simulation model with drive control results in parametrically excited torsional vibration amplitudes that match very well with measured amplitudes.","PeriodicalId":49185,"journal":{"name":"International Journal of Acoustics and Vibration","volume":"22 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41474652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0