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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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Lift Coefficient Variation on a Cylinder Forced to Oscillate 被迫振荡的圆柱体的升力系数变化
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0052
J. Bernhardt, Jadran A. Mihailovic, C. F. Jines, Aziz Abouel-Fotouh, T. Corke, David R. Williams
{"title":"Lift Coefficient Variation on a Cylinder Forced to Oscillate","authors":"J. Bernhardt, Jadran A. Mihailovic, C. F. Jines, Aziz Abouel-Fotouh, T. Corke, David R. Williams","doi":"10.1115/imece1997-0052","DOIUrl":"https://doi.org/10.1115/imece1997-0052","url":null,"abstract":"\u0000 The instantaneous pressure distribution around the azimuth of a cylinder undergoing forced oscillations is measured using an array of 18 miniature microphones. The microphones were placed at the midspan of the cylinder with 20 degree increments between each sensor. The Reynolds number for the experiments was 13,800. The cylinder is driven in a sinusoidal motion by a printed circuit motor with an amplitude A/D = 0.18 and with bare winding numbers (Ω = f/fn) of 0 ≤ Ω ≤ 1.1. Regions of lock-in between the cylinder motion and the lift coefficient were observed at dressed winding numbers of ω = 2:3, 1:2 and 1:1. Phase diagrams show two distinctly different synchronization mechanisms, one fundamental and the other a subharmonic type, which supports the findings of Ongoren and Rockwell (1988).","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"124 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":"132579036","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 Singular Nature of Rotating Circular Rings With Symmetry 对称旋转环的奇异性
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0071
D. Quinn, C. Clemons, K. M. Dempsey
{"title":"The Singular Nature of Rotating Circular Rings With Symmetry","authors":"D. Quinn, C. Clemons, K. M. Dempsey","doi":"10.1115/imece1997-0071","DOIUrl":"https://doi.org/10.1115/imece1997-0071","url":null,"abstract":"\u0000 We study the S𝒪(2) symmetric deformation of circular rings. The equations of motion are based on general partial differential equations governing the elastodynamics of geometrically exact rings, which have been formulated by Dempsey [2], based on the work of Libai and Simmonds [6]. Thus, the formulation is valid for arbitrary pressure forcing, large deformations, and finite strains, although the results are tempered by a linear constitutive relation and an assumption of plane strain.\u0000 With the assumption that the deformation retains S𝒪(2) symmetry, the partial differential equations are reduced to a set of coupled ordinary differential equations. Within this restricted space of solutions, we study the existence and stability of relative equilibria and discuss the effects of constant hydrostatic pressure on the dynamical response. Specifically, we find that interaction between inertial effects arising from rotational motion and the combined elastic and external pressure forces can produce unexpected behavior, including the existence of a “buckled” state which retains the symmetry, yet physically implies that material planes do not lie in the radial direction. Such a state is shown to effect the large-amplitude response of the system in a singular limit of the governing equations.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"27 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":"114455164","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
Multibody Systems in Nonlinear Waves 非线性波中的多体系统
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0064
R. Kral, E. Kreuzer, V. Schlegel
{"title":"Multibody Systems in Nonlinear Waves","authors":"R. Kral, E. Kreuzer, V. Schlegel","doi":"10.1115/imece1997-0064","DOIUrl":"https://doi.org/10.1115/imece1997-0064","url":null,"abstract":"\u0000 Almost all offshore structures have to be modeled as multibody systems. Only ships or single pontoons can be modeled as a single rigid body. The dynamic behavior of the multibody system is significantly influenced by fluid-structure interactions. So far, most available methods for analyzing these interactions are restricted to single bodies, small wave amplitudes and body motions, or both.\u0000 In the present paper a two-dimensional boundary integral approach with fully nonlinear boundary conditions on the free surface is used to simulate the behavior of elastically coupled floating multibody systems in gravity waves. This method will be applied to analyze the dynamics of two floating bodies moored to a quay.\u0000 The results of numerical simulations for selected configurations are shown.","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":"116801486","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
Method for Measuring the Sound Intensity of Rotating Broadband Aerodynamic Noise Sources 旋转宽带气动噪声源声强的测量方法
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0086
Daniel A. Haid, L. Mongeau
{"title":"Method for Measuring the Sound Intensity of Rotating Broadband Aerodynamic Noise Sources","authors":"Daniel A. Haid, L. Mongeau","doi":"10.1115/imece1997-0086","DOIUrl":"https://doi.org/10.1115/imece1997-0086","url":null,"abstract":"\u0000 A method was investigated for the measurement of the near field sound intensity of rotating broadband noise sources. The method used two sound intensity probes held stationary in the laboratory reference frame, which were conditionally sampled to track the motion of pre-defined rotating source regions along their circumferential path. The cross-correlation coefficient of the sound intensity for a single location in the rotating frame of reference was then calculated from the two stationary probe signals. Multiple probe spacings provided the information required for an estimate of the cross-correlation function, which was then Fourier transformed to yield the sound intensity spectrum. The method was validated using known stationary random signals, and the numerical simulation of a rotating source. The source spectrum in each case was successfully estimated despite leakage, a high variance, and a bias error in the intensity. The method was then applied to a mixed flow automotive cooling fan and the results were compared to flow measurements.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"32 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":"125905780","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
Flow-Induced Vibration of a Tube Array in the Inlet Region of a High Performance Steam Generator: Part 2 — Unstable Vibration and Chaos 高性能蒸汽发生器进气道管阵的流激振动:第二部分——不稳定振动与混沌
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0067
Toshihiko Iwase, Takeshi Sunami, Kazuhiko Matsutani, Tomomichi Nakamura, N. Mureithi, A. Tsuge, J. Kasahara, K. Tomomatsu, O. Takaba
{"title":"Flow-Induced Vibration of a Tube Array in the Inlet Region of a High Performance Steam Generator: Part 2 — Unstable Vibration and Chaos","authors":"Toshihiko Iwase, Takeshi Sunami, Kazuhiko Matsutani, Tomomichi Nakamura, N. Mureithi, A. Tsuge, J. Kasahara, K. Tomomatsu, O. Takaba","doi":"10.1115/imece1997-0067","DOIUrl":"https://doi.org/10.1115/imece1997-0067","url":null,"abstract":"\u0000 The vibration of a tube array in the entrance region of a high performance steam generator, which is caused by the flow of the coolant fluid, has been shown to be random and having small amplitudes in Part 1 of this series. In this second part, the results of tests with modified tube boundary conditions are presented. Fluidelastic instability leads to chaotic vibration. All of the flexible tubes are at the extremities of the tube array, where the fluid-flow enters or exits the array. Even in this position the tube instability can be predicted by a Connors’ type criterion. Chaotic vibration occurs because the tubes have small gaps at the intermediate supports along the tube-span. A fractal dimensional analysis shows good coincidence with physical explanation of the phenomenon based on observation.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"3 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":"130084934","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
Exploration of Flow-Induced Vibration at Low Mass and Damping 低质量低阻尼流激振动研究
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0045
Mohammed R. Gharib, D. Shiels, M. Gharib, A. Leonard, A. Roshko
{"title":"Exploration of Flow-Induced Vibration at Low Mass and Damping","authors":"Mohammed R. Gharib, D. Shiels, M. Gharib, A. Leonard, A. Roshko","doi":"10.1115/imece1997-0045","DOIUrl":"https://doi.org/10.1115/imece1997-0045","url":null,"abstract":"\u0000 Elastically supported cylinders in cross flow are investigated experimentally and by numerical simulation. For very low values of cylinder mass ratio, it is found that the oscillation frequency is controlled by vortex shedding, with no lock-in to the mechanical frequency. In the numerical simulations the systems studied have zero mass and damping. A range of values of spring constant, including zero, is investigated at Reynolds number 100. It is found that the oscillation frequency stays in a narrow range 0.15 < fd/U∞ < 0.2 and the amplitude is in the range 0.4 < A/D < 0.6, eventually decreasing at large values of spring force.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"69 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":"126381568","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
Test Line Assessment of Mechanical Power Flow in Overhead Conductors and Efficiency of Damping Devices 架空导线中机械功率流的测试线路评估和阻尼装置的效率
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0056
A. Leblond, P. Van Dyke, L. Bibeau, C. Hardy
{"title":"Test Line Assessment of Mechanical Power Flow in Overhead Conductors and Efficiency of Damping Devices","authors":"A. Leblond, P. Van Dyke, L. Bibeau, C. Hardy","doi":"10.1115/imece1997-0056","DOIUrl":"https://doi.org/10.1115/imece1997-0056","url":null,"abstract":"\u0000 This paper deals with a method for evaluating the flow of vibration power in single overhead conductors along a full-scale test line. Aeolian vibrations of these conductors are represented by two opposite-moving traveling wave trains which convey vibration energy. The method leads to the determination of vibration power flow as well as the spectral content of these waves. Whenever a damping device is attached to the conductor, an average traveling wave reflection coefficient can be calculated, yielding the damping device efficiency. The efficiency of three different devices is calculated: a Stockbridge-type damper, a bretelle damper and a typical suspension clamp. The magnitude of the inherent error in the method is also evaluated.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"57 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":"129150263","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
Characterization of the Wind Noise Loading of Production Automobile Greenhouse Surfaces 量产汽车温室表面风噪声载荷特性研究
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0084
W. Coney, J. Her, J. Moore
{"title":"Characterization of the Wind Noise Loading of Production Automobile Greenhouse Surfaces","authors":"W. Coney, J. Her, J. Moore","doi":"10.1115/imece1997-0084","DOIUrl":"https://doi.org/10.1115/imece1997-0084","url":null,"abstract":"\u0000 Flow noise reaches the automobile interior through a variety of mechanisms including the aerodynamic excitation of vibration and its reradiation from greenhouse surfaces (the roof and glass panels). This paper describes an experimental characterization of this wind noise loading and an approximate procedure for its prediction.\u0000 Experimental procedures and unique instrumentation to measure parameters characterizing wavenumber-frequency spectra of the wind noise loading, i.e. wall pressure fluctuations, during wind tunnel tests of unmodified production automobiles are described. Results in the form of localized Corcos model parameters are presented.\u0000 The present modeling approach is semi-empirical, utilizing normalized wall pressure spectra. Steady flow data are used to scale the normalized spectra and to identify regions of differing flow structure which have each been assigned characteristic spectra. Spatial variation in predicted pseudo-noise is compared with measured values for several test configurations.","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":"115803932","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
Calculation of Vibro-Impact Dynamics of Loosely Supported Rods 松支杆振动冲击动力学计算
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0063
J. Knudsen, A. Massih, L. Johansson
{"title":"Calculation of Vibro-Impact Dynamics of Loosely Supported Rods","authors":"J. Knudsen, A. Massih, L. Johansson","doi":"10.1115/imece1997-0063","DOIUrl":"https://doi.org/10.1115/imece1997-0063","url":null,"abstract":"\u0000 Vibro-impact dynamics of a loosely-supported rod subject to harmonic and random forces are analyzed. A rod constrained by unilateral contact against springs at contact sites located at different positions is modeled. The beam equations of motion for the rod, with appropriate boundary conditions, are discretized in space by finite element method and in time. The contact forces are computed from the displacements. The model has been used to simulate one span of a rod fixed at one end and loose at the other end. Impact forces, and displacements are calculated as a function of time for different friction coefficients when the rod at one end is subject to sinusoidal or random forces. Lissajous figures and phase plane maps for the system are plotted. Further, the wear rate of the rod is predicted. Some of the predictions are compared with experiments and the results are satisfactory.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"73 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":"132562700","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
Optimization of Fluid-Structure Interaction Using the Sensitivity Equation Approach 基于灵敏度方程法的流固耦合优化
4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0042
R. Bhaskaran, G. Berkooz
{"title":"Optimization of Fluid-Structure Interaction Using the Sensitivity Equation Approach","authors":"R. Bhaskaran, G. Berkooz","doi":"10.1115/imece1997-0042","DOIUrl":"https://doi.org/10.1115/imece1997-0042","url":null,"abstract":"\u0000 A methodology for the optimization of coupled fluid-structure systems that couples flow and structural analysis codes without requiring iteration between the two codes is presented here. This method is valid in the nonlinear transonic and high-alpha regimes. It requires the sensitivity of the flow solution to perturbations in the geometry, in addition to the flow solution for the undeformed configuration. The flow solution for the base configuration and its sensitivity to geometric parameters are generated and transferred to the finite-element structural code. The structural code then solves the direct and sensitivity problems for the coupled fluid-structure system using a modified stiffness matrix. Results for the direct problem axe presented for the static aeroelastic effects on a wing section in inviscid transonic flow. The wing section is mounted through a torsion spring, in which case the geometry variation is due to deformation as well as rotation about the hinge point. The displacements show the expected aeroelastic relief effect due to the flexible loads increment. Both the flow sensitivity and the sensitivity of the coupled fluid-structure system are calculated using the sensitivity equation or direct differentiation approach. The flow sensitivity calculation is implemented by altering an existing flow code, CFL3D from NASA Langley. Implementation of optimization of the coupled system is being performed using the commercial C++ class library, PDESolve. Code snippets are presented to illustrate that an object-oriented library like PDESolve significantly reduces the effort in implementing the direct and sensitivity solutions.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"49 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":"129347600","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
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