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Decoupled three-degree-of-freedom forced vibration system for bridge section model

A vibration system and forced vibration technology, applied in aerodynamic tests, measuring devices, instruments, etc., can solve the problems of poor vibration waveform accuracy, difficult decoupling, large span, etc., and achieve good real-time performance and accurate test data Effect

Inactive Publication Date: 2012-07-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many technical problems in realizing the forced vibration of the bridge segment model in the wind tunnel, such as difficult decoupling, large span, poor synchronization of vibration systems on both sides, and poor vibration waveform accuracy.

Method used

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  • Decoupled three-degree-of-freedom forced vibration system for bridge section model
  • Decoupled three-degree-of-freedom forced vibration system for bridge section model
  • Decoupled three-degree-of-freedom forced vibration system for bridge section model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: (see Figure 1 to Figure 9 ) degree-of-freedom bridge segment model forced vibration system, which consists of an outer vibration system (1), an inner vibration system (2), a model support system (3) and a detection system (4). The outer vibration system (1) and the inner vibration system (2) are symmetrically arranged on both sides of the wind tunnel, the bridge segment model is connected to the model support system (3) through the detection system (4), the outer vibration system (1) and the inner vibration system The system (2) vibrates synchronously under the drive of the servo motor, so as to realize the three-degree-of-freedom forced vibration of the bridge segment model. figure 1 The middle and outer vibration system (1) is not equipped with a shell.

Embodiment 2

[0028] Embodiment 2: (see Figure 2 to Figure 9 ) The outer vibration system (1) consists of a frame (1-1), a horizontal vibration slider crank mechanism (1-2), a vertical vibration slider crank mechanism (1-3), a torsional vibration crank rocker mechanism (1- 5), XY motion composite mechanism (1-4), small wheel support type Oldham coupling (1-9), XY sliding bracket (1-6), locking mechanism (1-7) and angle of attack adjustment Organization (1-8) composition. The horizontal vibration crank slider mechanism (1-2) consists of eccentric wheel type adjustable crank (1-2-1), connecting rod (1-2-2), Y-shaped push rod (1-2-4), horizontal vibration Linear bearing seat (1-2-3) and horizontal vibration support (1-2-5), horizontal vibration linear bearing seat (1-2-3) and horizontal vibration support (1-2-5) are fixed on the frame On (1-1), the sinusoidal vibration in the horizontal direction is output under the drive of the servo motor; the vertical vibration crank slider mechanism (1-...

Embodiment 3

[0029] Embodiment 3: (see figure 1 ) The corresponding parts of the inner vibrating system (2) are mirror-image symmetrical with the corresponding parts of the outer vibrating system (1) in terms of shape and installation position, and the transmission principle is exactly the same, synchronously vibrating under the drive of the servo motor.

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Abstract

The invention provides a decoupled three-degree-of-freedom forced vibration system for a bridge section model. The system comprises an outer vibration system, an inner vibration system, a model support system and a detection system, wherein the outer vibration system and the inner vibration system are symmetrically arranged on the two sides of a wind tunnel; the model support system is connected with the outer vibration system and the inner vibration system respectively, and is also connected with the detection system; the detection system is connected with the bridge section model through an inner model connecting plate and an outer model connecting plate; and the outer vibration system and the inner vibration system synchronously vibrate under the drive of a servo motor to realize the synchronous three-degree-of-freedom sinusoidal vibration of the bridge section model. By the system, the transverse motion, vertical motion and torsional motion of the model in a section are realized, and are combined into totally seven kinds of motion with higher amplitude, and each kind of motion is independent simple harmonic motion with adjustable frequency, amplitude and phase. The system has the advantages of capability of acquiring three components of force of the bridge section model in real time, and data accuracy.

Description

technical field [0001] The invention relates to a completely decoupled three-degree-of-freedom bridge segment model forced vibration system, which realizes the horizontal vibration, vertical vibration, and torsional vibration of the bridge segment model in the cross section, and the above three forced vibrations are free combination vibrations. And the angle of attack can be adjusted. It is applied to the study of the vibration characteristics and failure mechanism of the bridge segment model in the wind tunnel flow field. Background technique [0002] In the wind tunnel flow field, the detection and analysis of the section mechanical parameters of the bridge segment model under forced vibration can obtain the aerodynamic derivative of the bridge segment model, which is an important means for studying bridge vibration damage. There are many technical difficulties in realizing the forced vibration of the bridge segment model in the wind tunnel, such as difficult decoupling, ...

Claims

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Application Information

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IPC IPC(8): G01M9/08
Inventor 李惠辛大波高永生张海兵
Owner HARBIN INST OF TECH
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