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4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I最新文献

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Vortex Induced Vibration of Chemical Plant Towers 化工塔涡激振动研究
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0049
H. Goyder
{"title":"Vortex Induced Vibration of Chemical Plant Towers","authors":"H. Goyder","doi":"10.1115/imece1997-0049","DOIUrl":"https://doi.org/10.1115/imece1997-0049","url":null,"abstract":"\u0000 It is well known that vortex shedding can cause vibration of cylindrical structures. However, an actual case of vortex shedding from a chemical plant distillation column revealed that pipework on the outside of the column can cause the vibration to be significantly enhanced in comparison to that of a bare cylinder. This observation contradicts the commonly held view that equipment and pipework on the outside of cylinders reduces the effects of vortex shedding. Wind tunnel studies on a fully flexible sectional model of the column indicated that in some cases relatively small pipework can increase the vibration by a factor of three in comparison to the vibration of a plain cylinder. The case history, the wind tunnel studies and the solution adopted for the column are described in this paper.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115264031","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
Aerodynamic Noise Calculation of a Detaching Flow 分离流的气动噪声计算
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0080
S. Huang, C. Béguier
{"title":"Aerodynamic Noise Calculation of a Detaching Flow","authors":"S. Huang, C. Béguier","doi":"10.1115/imece1997-0080","DOIUrl":"https://doi.org/10.1115/imece1997-0080","url":null,"abstract":"\u0000 A numerical study based on the macro-simulation method is carried out in order to determine the aerodynamical noise of a turbulent detaching flow. The macro-simulation method uses a Large Eddy Simulation (LES) code to obtain at the same time, the large structures of the flow and the small structures modelled by a sub-grid eddy viscosity, and an acoustic code able to calculate, in the far field, the radiated aerodynamical noises, from the Lighthill-Curle formalism. The method permits to dissociate the different aerodynamical noises: the wall noise, due to the wall-pressure fluctuations, the shear noise, due to the large scale quadrupole sources, and the turbulence self noise, generated by the small scale quadrupole sources. The case of the normal backward facing step is presented, for which the different emitted noises are analysed and compared together. Some theoretical hypotheses are also tested.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127162780","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
The Flow Dynamics of an Asymmetrical Circular Cylinder Under Acoustic Excitation 声场激励下非对称圆柱的流动动力学
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0089
K. Lo, N. Ko
{"title":"The Flow Dynamics of an Asymmetrical Circular Cylinder Under Acoustic Excitation","authors":"K. Lo, N. Ko","doi":"10.1115/imece1997-0089","DOIUrl":"https://doi.org/10.1115/imece1997-0089","url":null,"abstract":"\u0000 In the present study, the asymmetry of the cylinder was achieved by attaching a 90° V-grooved strip on the cylinder surface. Different flow regimes are present on the grooved and smooth halves. Under acoustic excitation, the flow regimes over the two halves are changed and the near wake structures of the grooved cylinder are modified. Further, the transition process is not stationary in time and two different transient processes are observed during the transition.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123740065","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
Fluid-Structural-Acoustical Interactions of a Thin Plate in a Cannel With Flowing Fluid 流动流体通道中薄板的流-固-声相互作用
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0083
I. Zolotarev
{"title":"Fluid-Structural-Acoustical Interactions of a Thin Plate in a Cannel With Flowing Fluid","authors":"I. Zolotarev","doi":"10.1115/imece1997-0083","DOIUrl":"https://doi.org/10.1115/imece1997-0083","url":null,"abstract":"\u0000 The dispersion properties of the structural and acoustic waves in the coupled plate-fluid system are presented. The thin elastic plate considered as a simply supported one in the first case and as a part of an unlimited wall of a cannel with flowing fluid in the second case. The linear potential flow theory for inviscid fluid is used. The frequency and modal characteristics are analysed in the range of parameters where the coupling effects between vibration of plate and fluid are either weak or dominant.\u0000 The properties of simply supported steel plate interacting with air in cannel for some dimensionless parameters of system was studied by using ANSYS finite element code. As a result of this calculation some dispersion characteristics and fluid pressure distribution in the cannel were obtained.\u0000 The frequencies and modal properties of this system as a result of numerical solution (by using ANSYS modelling) are compared with some experimental results.\u0000 It is shown that in the fluid-elastic system the strongest acoustic-structural coupling exists if the resonances of acoustic and mechanical systems are sufficiently close. In this case the coupled fluid-mechanical system has two different natural frequencies that are neither pure structural properties nor acoustical. Consequently the fluid-plate arrangement can not be studied separately for the structural and acoustical resonances. Even a light medium can significantly change the spectrum of natural frequencies of a structure. Some expressions for calculation of critical flow velocities are derived.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127028978","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
Fluid Flow-Induced Vibration of Suspended Nonlinear Cables 悬吊非线性索的流体诱导振动
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0070
W. Chang, V. Pilipchuk, R. Ibrahim
{"title":"Fluid Flow-Induced Vibration of Suspended Nonlinear Cables","authors":"W. Chang, V. Pilipchuk, R. Ibrahim","doi":"10.1115/imece1997-0070","DOIUrl":"https://doi.org/10.1115/imece1997-0070","url":null,"abstract":"\u0000 The nonlinear interaction of the first two in-plane modes of a suspended cable with a moving fluid along the plane of the cable is studied. The governing equations of motion for two-mode interaction are derived based on a general continuum model. The interaction causes the modal differential equations of the cable to be non-self-adjoint. As the flow speed increases above a certain critical value, the cable experiences oscillatory motion similar to the flutter of aeroelastic structures. A coordinate transformation in terms of the transverse and stretching motions of the cable is introduced to reduce the two nonlinearly coupled differential equations into a linear ordinary differential equation governing the stretching motion, and a strongly nonlinear differential equation for the transverse motion. For small values of gravity-to-stiffness ratio the dynamics of the cable is examined using a two-time-scale approach. Numerical integration of the modal equations shows that the cable experiences stretching oscillations only when the flow speed exceeds a certain level. Above this level both stretching and transverse motions take place. The influences of system parameters such as gravity-to stiffness ratio, density ratio, and the fluid flow randomness on the response characteristics are also reported.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129513846","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: 7
Flow/Acoustic Interactions for Two Cylinders in Cross Flow 横流中两圆柱的流声相互作用
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0090
J. Fitzpatrick, F. Nitti
{"title":"Flow/Acoustic Interactions for Two Cylinders in Cross Flow","authors":"J. Fitzpatrick, F. Nitti","doi":"10.1115/imece1997-0090","DOIUrl":"https://doi.org/10.1115/imece1997-0090","url":null,"abstract":"\u0000 The noise generated by two cylinders placed in tandem (i.e. the second in the wake of the first) has been investigated for spacings of 5, 4 & 3 diameters. Measurements of turbulence were obtained between the two cylinders and of fluctuating pressure for the near field region for these cylinder spacings using a microphone with a nose cone. Turbulence levels in the test section were varied using a grid upstream and tests were conducted at different flow velocities and incident levels of turbulence. Although, for a number of cases, up to four peaks related to vortex shedding were evident in the spectrum, most measurements exhibited two peaks, a dominant one at the vortex shedding frequency with a secondary peak at twice this value. The measurements show that the vortex noise is strongest at the mid point between the cylinders and at the rear cylinder with levels of 130 dB. The harmonic component was strongest at the downstream cylinder where peak values of 110 dB were obtained.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128113428","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 Aeroelastic Instability of a Rectangular Cylinder in Heaving Oscillations 升沉振荡中矩形圆柱气动弹性失稳的数值研究
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0061
T. Tamura, Y. Itoh
{"title":"Numerical Study on Aeroelastic Instability of a Rectangular Cylinder in Heaving Oscillations","authors":"T. Tamura, Y. Itoh","doi":"10.1115/imece1997-0061","DOIUrl":"https://doi.org/10.1115/imece1997-0061","url":null,"abstract":"\u0000 The unsteady three-dimensional flows around a forced-oscillating or freely oscillating rectangular cylinder are numerically simulated by means of the direct finite difference method without any turbulence model. We discuss the accuracy of the present method for prediction of unsteady aerodynamic forces and responses to various dynamic properties. First we examine the aerodynamic forces in case of forced oscillation with D/B = 2 of a rectangular cylinder through the comparison with experiments. Also, in order to understand fundamental behaviors of unstable oscillations of a rectangular cylinder, which is elastically mounted in heaving mode in uniform flow, the effect of various dynamic parameters such as mass ratio, damping ratio or the Scruton number, on aeroelastic instabilities is individually investigated.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124568994","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
Modeling Vortex-Excited Vibrations of Uniform Cylinders in Uniform and Shear Flow 均匀和剪切流动中均匀圆柱涡激振动的建模
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0050
S. Balasubramanian, R. Skop
{"title":"Modeling Vortex-Excited Vibrations of Uniform Cylinders in Uniform and Shear Flow","authors":"S. Balasubramanian, R. Skop","doi":"10.1115/imece1997-0050","DOIUrl":"https://doi.org/10.1115/imece1997-0050","url":null,"abstract":"\u0000 In recent years, nonlinear wake oscillator models have been shown to arise as a leading order approximation to the vortex shedding instability from a circular cylinder in a uniform flow (Alberéde and Monkewitz, 1992). Skop and Balasubramanian (1995) and Balasubramanian and Skop (1996) have extended the Van der Pol oscillator to model vortex shedding in non-uniform flow scenarios by introducing an axial diffusive coupling term in the equation. The results of their investigations have yielded a universal linear relationship between a turbulent kinematic viscosity that scales the diffusive coupling term and the shear parameter that quantifies the shear in the flow.\u0000 In this paper, following Skop and Balasubramanian (1997), we use the diffusively coupled Van der Pol oscillator as the governing equation for one component of the fluctuating lift force on the cylinder. The second component of the lift force is represented by a stall term which is linearly proportional to the transverse velocity of the cylinder. The coupled fluid-structural equations are employed to numerically simulate the response of a uniform pivoted cylinder in uniform and shear flow. The numerically predicted response amplitudes and bounds of lock-in are compared to available experimental results.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114241274","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
Energy Flow Analysis of Flow-Excited Beams and Plates 流激梁与板的能量流分析
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0081
F. Han, R. Bernhard, L. Mongeau
{"title":"Energy Flow Analysis of Flow-Excited Beams and Plates","authors":"F. Han, R. Bernhard, L. Mongeau","doi":"10.1115/imece1997-0081","DOIUrl":"https://doi.org/10.1115/imece1997-0081","url":null,"abstract":"\u0000 Two methods for calculating the power density input to structures excited by turbulent flow were developed and used to predict the average response of the structure. The input power density was calculated using the cross-spectral density of the random fluctuating pressure loading on the structure. The energy response of structures excited by distributed loading was obtained using the energy flow analysis method. Both methods for calculating the input power density and the method for calculating the energy density response were verified for beams and plates using classical modal analysis.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133155894","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
Analytical Model for the Periodic Pressure Fluctuations Induced by Flow Over a Cavity 腔体流动引起周期性压力波动的解析模型
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0078
H. Kook, L. Mongeau
{"title":"Analytical Model for the Periodic Pressure Fluctuations Induced by Flow Over a Cavity","authors":"H. Kook, L. Mongeau","doi":"10.1115/imece1997-0078","DOIUrl":"https://doi.org/10.1115/imece1997-0078","url":null,"abstract":"\u0000 The interior of an open cavity exposed to a grazing flow is known to experience strong periodic pressure oscillations sustained for a wide range of flow velocities. In this study, an analytical model was investigated to allow predictions of the amplitude and the frequency of the pressure fluctuations induced inside the cavity. The flow-excited cavity system was assumed to be described in the frequency domain by two gain functions, forming a limit cycling closed-loop. The forward gain function is associated with the excitation mechanism, governed by the shedding of discrete vortices within the shear layer over the orifice. The backward gain function is associated with the acoustic response of the cavity resonator. An original approach was followed to determine the forward gain function, based on the vorticity formulation of the equations of motion (the so-called “vortex sound” theory). The analytical model was experimentally verified for a range of flow velocities and orifice dimensions. The predictions were found to be in good agreement with experimental observation.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130928733","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
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