Accurate detection method for defect of pipeline elbow
A technology of pipeline elbow and detection method, which is applied in the direction of measuring device, processing response signal of detection, generation of ultrasonic/sonic/infrasonic wave, etc. Information, failure to detect pipe elbows, etc.
Active Publication Date: 2019-11-19
西交思创智能科技研究院(西安)有限公司
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Problems solved by technology
[0005] The existing ultrasonic guided wave signal excitation method is to arrange the sensors evenly in the circumferential direction at both ends of the pipe elbow, one end is an excitation sensor arranged in a circular array, and the other end is a receiving sensor arranged in a circular array. The S0 mode is excited in the pipe elbow, and the T mode can be excited in the pipe elbow by applying circumferential excitation to the excitation sensor at the same time. This excitation method can only obtain one effective signal in a single measurement, so it limits the acquisition of elbows. Structural integrity information cannot achieve high-resolution detection of elbow defects; on the other hand, studies have shown that ultrasonic guided waves excited by existing excitation methods, whether using S0 mode or T mode, cannot The inner area of the pipe elbow is detected. Therefore, it is necessary to study new and effective guided wave excitation technology and signal processing methods to realize accurate, effective, comprehensive and rapid detection of pipe elbow defects.
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[0074] The present invention will be further described below in conjunction with the accompanying drawings and embodiments to verify the effectiveness of the present invention in application, but this example is not intended to limit the present invention.
[0075] refer to Image 6 , the high-precision detection method of pipeline elbow defects based on ultrasonic guided waves according to the present invention comprises the following steps:
[0076] Step 1, first build the figure 1 The pipeline elbow ultrasonic guided wave detection system shown, the pipeline elbow ultrasonic guided wave detection system includes a guided wave excitation system, a guided wave acquisition system and a computer, wherein the guided wave excitation system includes a waveform generator, an amplifier and a guided wave The excitation sensor is connected with the voltage amplifier, the amplifier is connected with the waveform generator, and the ultrasonic guided wave propagating along the pipe bend...
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The invention discloses an accurate detection method for a defect of a pipeline elbow. Chirp signals are sequentially applied to single excitation sensors to obtain Chirp excitation response signals;narrow-band pulse signals of guided waves at different center frequencies are extracted from the Chirp excitation response signals by using a narrow-band pulse extraction method, modal identificationis performed on wave packets in the extracted narrow-band pulse signals, and the center frequency of narrow-band extraction is confirmed by taking the acquisition of a pure S0 mode as the purpose; a pipeline elbow tomographic imaging forward model is built, and the guided wave flight time is calculated by utilizing a second-order differential forward algorithm; then, in combination with a steepestdescent inversion method, the narrow-band pulse extraction signals are analyzed based on the flight time features of the signals, and then defect feature information is identified and extracted for an analysis result; and finally, the depth and surface morphology features of the defect are displayed, so that the defect of the pipeline elbow is detected. The accurate, effective, comprehensive andrapid detection of the defect of the pipeline elbow can be realized.
Description
technical field [0001] The invention belongs to the field of defect detection of transportation pipelines, and relates to an accurate detection method of pipeline elbow defects. Background technique [0002] As the fifth largest transportation industry after railways, highways, water transportation and aviation, pipeline transportation plays an extremely important role in petrochemical, power generation and other industries and daily life due to its unique advantages. However, such pipelines usually work in harsh environments such as high temperature, high pressure, or electrical corrosion. In addition to the aging of the equipment structure itself, damages of varying degrees will inevitably occur, which will lead to major accidents and bring huge economic losses. Casualties will result. Pipeline elbows are an important part of the pipeline network, and the effective detection of their defects is of great significance for improving the detection of transportation pipelines....
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IPC IPC(8): G01N29/06G01N29/34G01N29/44
CPCG01N29/0672G01N29/069G01N29/348G01N29/44G01N29/4454G01N29/4472G01N2291/011G01N2291/023G01N2291/0289G01N2291/2638
Inventor王宇李学义
Owner西交思创智能科技研究院(西安)有限公司