A visual test device for high frequency vibration of roadbed under plane strain condition
A technology of plane strain and high-frequency vibration, which is applied to measuring devices, instruments, and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems of high test costs, complex mechanical behavior of bulk media, and the inability to realize the fluctuation state of the subgrade cross section and Direct observation of displacement changes and other issues to achieve the effect of intuitive and accurate information acquisition and space saving
Active Publication Date: 2020-07-28
TONGJI UNIV
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Problems solved by technology
Since roadbed materials mostly use granular materials such as graded gravel and coarse gravel, and the mechanical behavior of bulk media is very complex, the existing research has not yet fully explained its deformation mechanism. It is necessary to study the internal stress wave propagation and deformation evolution law under loading
The in-situ test is expensive and can only obtain the time history changes of physical quantities by embedding sensors, and cannot directly observe the fluctuation state and displacement changes of the subgrade cross section
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[0024] Such as figure 1 As shown, the device includes three parts: High-frequency loading device: This device can simulate the dynamic load generated by the high-speed train during the running process by adjusting parameters such as loading amplitude and frequency. Visual vibration monitoring and analysis device: This device uses a high-speed camera to record image data, combined with high-speed image processing software, to analyze the model's vibration deformation and internal stress wave propagation rules under high-frequency loads. Energy dissipation monitoring device: This device is composed of acceleration sensor, displacement sensor and data acquisition instrument. Acceleration sensors are placed at the junction of various layers of bulk materials in the subgrade model. By measuring the vibration time-history curves of bulk materials at different interfaces of each layer, the energy of vibration waves can be back-calculated. By comparing the data of each interface, the...
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The invention relates to a visual testing device of high-frequency roadbed vibration under a plane strain condition. The visual testing device comprises a model testing box, a high frequency loading device, a visual vibration monitoring device and an energy dissipation monitoring device, wherein a roadbed model is simulated by arranging multiple layers of bulk materials inside the model testing box; the high frequency loading device is used for simulating a dynamic load generated in the driving process of a high-speed rail train by adjusting the loading amplitude and the frequency, and applying the dynamic load to the roadbed model; the visual vibration monitoring device is connected with the high frequency loading device, comprises a workstation, and a high-speed camera and an adjustable light source which are connected with the workstation respectively, and is used for acquiring image data containing vibration deformation and internal stress wave propagation rules under the action of a high-frequency load; the energy dissipation monitoring device is arranged inside the model testing box, and is used for acquiring fluctuation characteristics inside the roadbed model. Compared with the prior art, the visual testing device has the advantages of multi-point loading, visual monitoring, consistency with a prototype and the like.
Description
technical field [0001] The invention relates to the field of roadbed dynamics, in particular to a visual test device for high-frequency vibration of roadbed under plane strain conditions. Background technique [0002] With the rapid development of my country's high-speed railway construction, the speed of trains is accelerating, and it is increasingly important to ensure driving safety. As a common track support structure, the subgrade's stability under the impact load of high-speed trains has a great impact on the safety of high-speed trains. Since roadbed materials mostly use granular materials such as graded gravel and coarse gravel, and the mechanical behavior of bulk media is very complex, the existing research has not yet fully explained its deformation mechanism. It is necessary to study the internal stress wave propagation and deformation evolution law under loading. The in-situ test is expensive and can only obtain the time history changes of physical quantities b...
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IPC IPC(8): G01N29/04G01N15/10
CPCG01N15/10G01N29/045G01N2291/02458G01N2291/02827
Inventor 肖军华张骁张德周顺华郭佳奇
Owner TONGJI UNIV