Video measurement-based natural vibration frequency identification method for dam

A technology of natural frequency and video measurement, applied in measuring devices, color TV parts, TV system parts, etc., can solve the problem of low spatial resolution of data, achieve high spatial resolution, and save manpower, material and financial resources Effect

Active Publication Date: 2018-06-05
WUHAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the sparse arrangement of sensors relative to the dam, the spatial resolution of the acquired data is low

Method used

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  • Video measurement-based natural vibration frequency identification method for dam
  • Video measurement-based natural vibration frequency identification method for dam

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Embodiment Construction

[0022] The specific implementation of the video measurement-based dam natural frequency identification method involved in the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023]

[0024] Such as figure 1 As shown, a concrete gravity dam 1 has a height of 103m, a crest width of 14.8m, an upstream storage level of 93.0m, and a downstream storage level of 32.0m. In order to measure its natural vibration frequency, DJI M600PRO UAV 2 was used to take pictures of the vibration process of the dam, as shown in figure 2 As shown, in the present embodiment, the specific steps of the dam natural frequency identification method based on video measurement are as follows:

[0025] Step 1: Collect the drone's non-natural frequency

[0026] Firstly, the wireless acceleration sensor 3 is fixed on the fuselage of the UAV 2 to collect the vibration of the UAV 2 itself. In order to reduce the influence of the wireless acceleration sens...

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Abstract

The invention provides a video measurement-based natural vibration frequency identification method for a dam. The method is time-saving, labor-saving and cost-saving, and can provide relatively high space resolution. The video measurement-based natural vibration frequency identification method for the dam is characterized by comprising the following steps: acquiring a natural vibration frequency of an unmanned plane through a wireless acceleration sensor mounted on the unmanned plane; controlling the unmanned plane to fly above a dam top, and shooting a dam top surface by using a camera mounted on the unmanned plane to shoot the edge part of the dam top, so as to acquire a dam top vibration video; extracting a stable video including a dam top edge image from the dam top vibration video; processing the stable video based on a phase motion estimation algorithm to acquire dam top edge motion information; processing the dam top edge motion information through a frequency domain decomposition method, extracting a vibration frequency, and culling out the natural vibration frequency of the unmanned plane from the extracted vibration frequency, so as to obtain a natural vibration frequencyof the dam.

Description

technical field [0001] The invention relates to a method for identifying the natural vibration frequency of a dam based on video measurement. technical background [0002] As a water-retaining structure, a dam has obvious political and economic benefits to society. It plays an important role in flood control, shipping, irrigation and power generation. However, during the service period of the dam, it may be damaged to varying degrees due to material aging, earthquakes, terrorist attacks, repeated blasting and excavation vibration disturbances in expansion projects, and human factors, which may cause it to fail to fully exert its design benefits. More seriously, It will seriously threaten the personal safety of downstream residents. Therefore, dam safety monitoring has very important practical significance. [0003] The identification of the dynamic characteristics (natural frequency, mode shape and damping ratio) of the dam is one of the important ways to carry out safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/246G06T7/13H04N5/232G01H17/00
CPCG06T7/13G06T7/246G01H17/00G06T2207/20024G06T2207/30184G06T2207/10016H04N23/80
Inventor 王高辉李麒卢文波钮新强陈明严鹏
Owner WUHAN UNIV
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