A dynamometer test method for studying the effect of torsional vibration damping ratio on bridge flutter derivatives
A technology of torsional vibration and force measurement, which is used in vibration testing, testing of machine/structural components, measuring devices, etc., to achieve the effect of easy operation and high recognition accuracy
Active Publication Date: 2019-04-05
DALIAN UNIV OF TECH
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Problems solved by technology
However, the wind-induced vertical bending, side bending and torsional vibrations of actual bridge sections are generally damped non-uniform amplitude vibrations, so it is necessary to propose a new test method to study the influence of damped vibrations on bridge flutter derivatives
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[0009] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
[0010] Such as figure 1 As shown, a dynamometer test method for studying the influence of torsional vibration damping ratio on bridge flutter derivative, the test device includes bridge model 1, dynamometer balance 2, rigid strut 3, servo motor 4, rotating shaft 5, base 6 and The binary end plate 7; the bridge model 1 is placed vertically, and is fixedly supported on the force-measuring balance 2 placed inside it to ensure that the torsion center of the bridge model 1 coincides with the torsion center of the force-measuring balance 2; the force-measuring balance 2 is fixed on the vertical The top of the straight rigid strut 3, the bottom end of the rigid strut 3 is fixed on the rotating shaft 5 of the servo motor 4, the rotating shaft 5 is concentric with the rigid strut 3, the servo motor 4 is fixed on the base 6, ...
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The invention provides a force testing experiment method for studying the influence of the twisting vibration damping ratio on a bridge oscillation differential coefficient, and belongs to the technical field of nonuniform amplitude simple harmonic forced vibration tests. The inertia force is calculated according to the model mass inertia moment and vibration acceleration; pneumatic power, i.e., static wind power and self-excitation force is obtained by subtracting the inertia force from the scale force measuring signal; the average value is subtracted to obtain the self-excitation force; then, the bridge oscillation differential coefficient under the conditions of different damping ratios and nonuniform amplitudes is recognized according to the existing theories; further, the influence ofthe vibration amplitude and the damping ratio on the oscillation differential coefficient can be analyzed. The experiment method realizes the nonuniform-amplitude twisting vibration of a bridge mainbeam section model under the condition of different damping ratios; the influence of the damping ratio and the vibration amplitude on the bridge oscillation differential coefficient can be studied; the reliable calculation parameter basis is provided for the bridge wind-caused vibration response analysis.
Description
technical field [0001] The invention belongs to a forced vibration dynamometer test method capable of studying the influence of the torsional vibration damping ratio on bridge flutter derivatives, and specifically relates to a servo motor controlled by a special program to drive a bridge main girder section model to realize band damping (divergence or attenuation) The non-equal-amplitude harmonic forced vibration of the rigid support model is used to simultaneously measure the inertial force and aerodynamic force signal of the model, and the inertial force calculated according to the mass moment of inertia and vibration acceleration of the bridge model (including the binary end plate) , the aerodynamic force is obtained by subtracting the inertial force of the model from the measured force of the balance, and then the static aerodynamic force (ie its average value) is subtracted to obtain the aerodynamic self-excited force, combined with the displacement and velocity time histo...
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IPC IPC(8): G01M7/02
CPCG01M7/00
Inventor 许福友杨晶曾冬雷应旭永
Owner DALIAN UNIV OF TECH