Finite element ultrasonic imaging method used for detecting defect in concrete
An ultrasonic imaging method and a technology for internal defects, which are applied in the processing of detection response signals and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as inaccurate imaging, and achieve the effects of wide application range, flexible use, and powerful functions
Active Publication Date: 2014-06-04
HUNAN ZHILI ENG SCI & TECH +2
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[0004] The technical problem solved by the present invention is: to provide a method for ultrasonic imaging of concrete using the finite element method, which can detect defects inside the concrete, and overcome the shortcomings of existing concrete ultrasonic detection methods that can only perform qualitative analysis based on the characteristics of ultrasonic signals. Or the disadvantage of inaccurate imaging due to the assumption that ultrasound travels along a straight line or that the speed of sound is constant when performing ultrasound imaging
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[0040] The technical scheme of the present invention will be further described below in conjunction with specific examples. In this example, we want to perform cross-sectional imaging on a prestressed concrete beam specimen containing metal bellows to obtain the distribution diagram of ultrasonic propagation velocity and the distribution diagram of ultrasonic attenuation coefficient, so as to judge the internal structure and composition of concrete. narrative order as figure 1 Shown in the flow chart of the invention.
[0041] Step 100: Transmit and Receive Ultrasound
[0042] First, suppose there are S ultrasonic transmitter locations and N ultrasonic receiver locations on the concrete surface. First, the ultrasonic transmitter at the first position emits ultrasonic waves, and the ultrasonic receivers at the N positions receive a series of ultrasonic signals, denoted as P 1 (t), P 2 (t)...P N (t); then the ultrasonic transmitter at the second position sends out ultrasoni...
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The invention discloses a finite element ultrasonic imaging method used for detecting defects in concrete. The finite element ultrasonic imaging method comprises an ultrasonic transmitter and a receiver which are positioned on the surface of the concrete. The ultrasonic transmitter and the receiver are respectively used for sending and receiving ultrasonic waves. After the filtering preprocessing is carried out to the collected ultrasonic signals, the finite element method is utilized to reconstruct physical parameters in the concrete. The finite element ultrasonic imaging method disclosed by the invention comprises the following specific steps of selecting ultrasonic propagating models, preprocessing signals, reconstructing finite element iteration, then processing images, analyzing the results according to the images, and determining the position, the size and the property of the defect in the concrete according to the structural design of the concrete.
Description
technical field [0001] The invention relates to an ultrasonic imaging method, in particular to a finite element ultrasonic imaging method for detecting internal defects of concrete. Background technique [0002] Concrete is composed of basic raw materials such as cement, sand, and stones. The quality problems that often occur include internal lack of compactness or holes, and external defects such as honeycomb pockmarks, cracks, and damaged layers, which will seriously affect the bearing capacity and durability of concrete components. , and even cause major safety accidents. Ultrasonic testing method is a conventional method in non-destructive testing of concrete. Compared with other non-destructive testing methods, it has good directivity, wide range of tested objects, large detection depth, accurate defect location, strong adaptability and high detection sensitivity. , low cost, small equipment size, fast speed, harmless to the human body and easy to use on site, so ultra...
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IPC IPC(8): G01N29/06G01N29/44
Inventor 朱自强章照宏喻波蒋奇云鲁光银肖嘉莹姚志立曾智力
Owner HUNAN ZHILI ENG SCI & TECH