System, equipment and method for detecting structural damages
A technology for structural damage and detection equipment, which is applied in the direction of measuring vibration, measuring devices, and vibration measurement in solids. Implementation and improvement of detection accuracy
Active Publication Date: 2012-12-12
TSINGHUA UNIV
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However, this method does not install a percussion device on the vehicle, so it is difficult to excite the higher frequency response of the bridge, and the obtained acceleration signal is not sensitive to local damage, and it is difficult to detect structural damage based only on the fundamental frequency of the bridge.
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0024] Before describing the embodiments of the present invention in detail, the principle of the present invention will be described first with reference to the accompanying drawings.
[0025] figure 1 is a simplified model of structural damage detection equipment used to illustrate the principles of the invention. Such as figure 1 As shown, a simplified model is adopted to illustrate the theoretical basis of the tap-scan scheme proposed by the present invention. In this model, the structural damage detection device is modeled as having k V The mass block M on the spring with the highest stiffness, and two sets of opposite rotating wheels with different axes are installed on the mass block Each of these runners starts from the initial angle θ 0i start at constant angular velocity (i=1, 2, ..., N) rotate to simulate the generator of the ...
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The invention relates to a structural damage detection method for detecting the structural damages. The method comprises the following steps of: scanning the surface of a structure by using a knocking device, meanwhile, knocking with knocking force with a preset frequency, wherein the preset frequency is close to one natural frequency or one of the more natural frequencies of the structure; sensing response signals transmitted from the surface of the structure to be detected to the knocking device by utilizing a sensor; transforming the signals sensed by the sensor to acquire a signal spectrogram of all positions on the surface of the structure; intercepting a spectrogram envelope curve corresponding to the preset frequency band of the knocking force from the signal spectrogram; calculating damage indicated values of all positions on the surface of the structure, wherein each damage indicated value reflects the similarity level of the spectrogram envelope curve of the position with the spectrogram envelope curves of other positions; and determining positions of which the damage indicated values mutate to be positions having structural damages. The invention also relates to a structural damage detection system of the structural damage detection method and structural damage detection equipment using in the method.
Description
technical field [0001] The invention relates to a structural damage detection system, equipment and a structural damage detection method, in particular to a structural damage detection system, equipment and a structural damage detection method for non-destructively detecting engineering structure damage. Background technique [0002] During the manufacture and use of engineering structures, some local damages, such as cracks, pits, debonding, etc., will often occur due to technological reasons or the use of loads. The accumulation of these damages to a certain extent will affect the normal use of the structure. In order to ensure the normal operation of the structure, it needs to be inspected for damage before it is put into use or after a period of service. For example, a bridge needs to be tested before it is opened to traffic to ensure that it meets the design requirements. During the service period, regular routine inspections or irregular special inspections are require...
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IPC IPC(8): G01N3/34G01H1/00
Inventor 向志海陆秋海戴晓玮张尧
Owner TSINGHUA UNIV