Aerodynamic Stability Criteria of One-Way Types of Hanging Roofs in Smooth Uniform Flow

Kawamura, Sumio; Kimoto, Eiji

doi:10.1016/b978-1-4832-8367-8.50088-7

Cited by 8 publications

(6 citation statements)

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“…Usually, it is believed that when the damping of the structure decreases to zero, flutter will occur (Haruo, 1975;Kawamura and Kimoto, 1979;Yang and Liu, 2005). As a result, the damping of the structure is usually used to judge whether flutter occurs.…”

Section: Damping Ratio For the Structurementioning

confidence: 99%

“…He suggested the vibration was a divergent flutter. Kawamura and Kimoto (1979) used modified thin airfoil theory to deduce the aerodynamic stability criteria for one-way tensioned membranes and defined the first two critical velocities as the wind velocity where the total damping was equal to zero and the wind velocity where one mode disappears and another mode appears. They also tested the response of a full-scale one-way tensioned membrane under the action of the wind (Kimoto and Kawamura, 1983) and found that above a certain wind velocity the vibration amplitude of the roof increased rapidly; that wind velocity was called the critical velocity.…”

Section: Introductionmentioning

confidence: 99%

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Research on the wind-induced aero-elastic response of closed-type saddle-shaped tensioned membrane models

Chen²,

Sun

2015

J. Zhejiang Univ. Sci. A

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Abstract:The aero-elastic instability mechanism of a tensioned membrane structure is studied in this paper. The response and wind velocities above two closed-type saddle-shaped tensioned membrane structures, with the same shape but different pretension levels, were measured in uniform flow and analyzed. The results indicate that, for most wind directions, several vibration modes are excited and the amplitude and damping ratio of the roof slowly increase with the on-coming flow velocity. However, for particular wind directions, only one vibration mode is excited, and the amplitude and damping ratio of the vibration mode increase slowly with the on-coming flow velocity. The aero-elastic instability is caused by vortex-induced resonance. On exceeding a certain wind speed, the amplitude of the roof vibration increases sharply and the damping ratio of the vibration mode decreases quickly to near zero; the frequency of the vortex above the roof is locked in by the vibration within a certain wind velocity range; the amplitudes of the roof in these wind directions reach 2-4 times the amplitudes for other wind directions. The reduced critical wind speeds for the aero-elastic instability of saddle-shaped membrane structures at the first two modes are around 0.8-1.0.

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Section: Damping Ratio For the Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the wind-induced aero-elastic response of closed-type saddle-shaped tensioned membrane models

Chen²,

Sun

2015

J. Zhejiang Univ. Sci. A

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“…The damping coefficient and the restoring force seem to vary with the sign and the extent of amplitude in the structure, when the initial tension is only controlled by weight of the roof. In a full-scale structure under natural wind action, the amplitude is shown to increase rapidly beyond a certain wind velocity, which is known as the "starting velocity" [14] [15]. It was pointed out that aerodynamic problems could be classified into two parts: (1) stability problems; (2) response problems.…”

Section: Aeroelastic Wind Tunnel Test On Flexible Roof Systemsmentioning

confidence: 99%

Aeroelastic Model Test on Cable Dome of Geiger Type

Tamura

2006

International Journal of Space Structures

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Preliminary results of an aeroelastic wind tunnel test on cable dome of Geiger type are presented in this paper. The structural design of the model is given out in details. Similarity requirement based on dimensional analysis is discussed including Froude number, Cauchy number and Scruton number, for etc. The required structural tests on aeroelastic model are conducted. Dynamic instability subject to harmonic excitation like SDOF hardening system is verified. Both odd and even frequency components are excited when the shaking table dowels at 29Hz. For the one-degree-of-freedom Duffing model, even frequency components will be impossible due to the symmetry of the motion equation if symmetry-breaking bifurcation behaviors do not occur. Ambient modal test shows the aeroelastic damping is significant. Some statistical results of wind tunnel tests are presented. Possibility of aeroelasic instability of cable dome is discussed.

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“…But those methods are all based on the condition that the inlet of flow is determined beforehand, so they cannot consider the fluid-structure interaction (FSI) actually. To determine the exact wind loads of tension structures, especially for the effect of wind-structure interaction, wind tunnel tests or semiempirical methods have been developed (Irwin and Wardlaw, 1979;Kawamura and Kimoto, 1979). However, some unavoidable errors will occur when using those semi-empirical methods, and wind tunnel test is too expensive to carry out for large-scale researches, so it is commonly used for some special structures.…”

Section: Introductionmentioning

confidence: 99%