阅读说明：本技术 一种管道厚度实时监测装置和管道厚度计算方法 (Pipeline thickness real-time monitoring device and pipeline thickness calculating method ) 是由 马卫锋 黑创 罗明璋 曹俊 王珂 任俊杰 聂海亮 宋恩鹏 蔡克 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种管道厚度实时监测装置和管道厚度计算方法,属于监测管道厚度领域。一种基于超声尾波的管道厚度实时评价的方法,包括以下操作：对采集到的数据进行希尔伯特变换,得到希尔伯特变换后的信号的实部u(t)和虚部v(t),利用式(1)计算出信号的相位-时间的变化规律；基于相位-时间变化规律,获取相位突变点所对应的时间t-(1)；根据双程旅行时间计算得到管道厚度L。本发明的计算方法,计算结果更加精确。本发明的管道厚度实时监测装置,通过数据实时传输实现了管道厚度的实时监测,为管道厚度的状态实时评价提供了基础。(The invention discloses a pipeline thickness real-time monitoring device and a pipeline thickness calculating method, and belongs to the field of pipeline thickness monitoring. A method for evaluating the thickness of a pipeline in real time based on ultrasonic wake waves comprises the following operations: hilbert transformation is carried out on the acquired data to obtain a real part u (t) and an imaginary part v (t) of the signal after Hilbert transformation, and a phase-time change rule of the signal is calculated by using a formula (1); acquiring time t corresponding to phase catastrophe points based on phase-time change rule 1 (ii) a And calculating the thickness L of the pipeline according to the two-way travel time. The calculation method of the invention has more accurate calculation result. The real-time monitoring device for the thickness of the pipeline realizes the real-time monitoring of the thickness of the pipeline through the real-time data transmission and provides a foundation for the real-time evaluation of the state of the thickness of the pipeline.)

1. A pipeline thickness real-time evaluation device based on ultrasonic tail waves is characterized by comprising a power supply module, an acquisition module, a PZT sensor, a data transmission module, a data analysis module and cloud architecture software;

the acquisition module is used for acquiring ultrasonic signals;

the PZT sensor is arranged on the outer wall of the pipeline to be monitored and used for transmitting and receiving ultrasonic signals;

the data transmission module is used for exchanging ultrasonic signals between hardware equipment and cloud architecture software;

the data analysis module is used for analyzing the ultrasonic signals to obtain the thickness of the pipeline, filtering the original data, performing Hilbert transform to obtain phase mutation points, and calculating to obtain the thickness of the pipeline;

the cloud architecture software is used for storing and processing ultrasonic signals;

the power module is used for supplying power to the components.

2. A real-time pipe thickness evaluation method based on ultrasonic wake waves is characterized by comprising the following operations:

hilbert transformation is carried out on the acquired data to obtain a real part u (t) and an imaginary part v (t) of the signal after Hilbert transformation, and a phase-time change rule of the signal is calculated by using a formula (1);

acquiring time t corresponding to phase catastrophe points based on phase-time change rule₁：

θ＝arctan(v(t)/u(t)) (1)

Calculating according to the two-way travel time to obtain the thickness L of the pipeline:

L＝s×t₁/2 (2)

where s is the propagation velocity of the wave in the pipe.

Technical Field

The invention belongs to the field of monitoring of pipeline thickness, and particularly relates to a pipeline thickness real-time monitoring device and a pipeline thickness calculating method.

Background

The long-distance pipeline is widely applied to various aspects of transportation of petroleum, natural gas, coal gas, water and the like. However, the long-distance pipeline is mostly in a complex environment, and the wall thickness index of the pipeline cannot meet the safety requirement due to corrosion, corrosion and other factors, so that an oil-gas pipeline accident occurs, and even huge economic loss can be caused. Therefore, monitoring the wall thickness of the pipeline, finding out unqualified pipeline sections in time and maintaining the unqualified pipeline sections, and having important significance for guaranteeing the transportation safety of the oil and gas pipeline.

At present, the commonly used method for measuring the wall thickness of the pipeline is an ultrasonic method (Fanwei, Rowa, which is a leap. ultrasonic detection technology for the wall thickness of the steel pipe of the pipeline [ J ]. welding pipe, 2015,38(2):56-59.[ doi: 1001-.

The existing ultrasonic echo travel time is mainly calculated by using a related algorithm, and the method depends on the selection of a window length and is greatly interfered by noise, so that the propagation time of ultrasonic waves in a pipeline is difficult to accurately calculate. In addition, the existing measuring means mainly comprises regular detection and cannot monitor the thickness change of the pipeline in real time.

Disclosure of Invention

The invention aims to overcome the defects that ultrasonic echo travel time is greatly interfered by noise and is difficult to accurately calculate propagation time when calculated by using a related algorithm in the prior art, and provides a pipeline thickness real-time monitoring device and a pipeline thickness calculating method.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a pipeline thickness real-time evaluation device based on ultrasonic tail waves comprises a power supply module, an acquisition module, a PZT sensor, a data transmission module, a data analysis module and cloud architecture software;

the acquisition module is used for acquiring ultrasonic signals;

the PZT sensor is arranged on the outer wall of the pipeline to be monitored and used for transmitting and receiving ultrasonic signals;

the data transmission module is used for exchanging ultrasonic signals between hardware equipment and cloud architecture software;

the data analysis module is used for analyzing the ultrasonic signals and realizing the analysis of the data by filtering the original data and performing Hilbert transform;

the cloud architecture software is used for storing and processing ultrasonic signals;

the power module is used for supplying power to the components.

A real-time evaluation method for pipeline thickness based on ultrasonic wake waves comprises the following steps:

hilbert transformation is carried out on the acquired data to obtain a real part u (t) and an imaginary part v (t) of the signal after Hilbert transformation, and a phase-time change rule of the signal is calculated by using a formula (1);

acquiring time t corresponding to phase catastrophe points based on phase-time change rule₁And calculating the thickness L of the pipeline according to the two-way travel time:

θ＝arctan(v(t)/u(t)) (1)

L＝s×t₁/2 (2)

where s is the propagation velocity of the wave in the pipe.

Compared with the prior art, the invention has the following beneficial effects:

the real-time monitoring device for the thickness of the pipeline realizes the real-time monitoring of the thickness of the pipeline through the real-time data transmission and provides a foundation for the real-time evaluation of the state of the thickness of the pipeline.

According to the method for calculating the thickness of the pipeline, the ultrasonic wake wave phase mutation is adopted for calculating the thickness, compared with the conventional thickness calculation method, the influence of the selection of artificial parameters on the thickness calculation is avoided, and the calculation result is more accurate.

Drawings

FIG. 1 is a signal waveform obtained by experimental measurement;

fig. 2 is a graph showing changes of the real part and the imaginary part obtained after hilbert transformation of an ultrasonic signal.

Fig. 3 is a diagram showing a phase change of a signal obtained by hilbert transform.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Aiming at the defects of the prior art, the invention provides a pipeline thickness real-time monitoring device based on PZT and cloud architecture and a pipeline thickness calculation method based on ultrasonic wake wave phase mutation.

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, fig. 1 is a waveform diagram of a signal obtained through experimental measurement, and it can be seen from the diagram that the tail waves after the ultrasonic direct wave are relatively cluttered, and it is difficult to extract the arrival time of the echo by using a common correlation method, and it is difficult to accurately calculate the thickness of the pipeline.

The method of the invention is utilized to carry out Hilbert transform on the ultrasonic signal to obtain a real part and an imaginary part of the signal, which are shown in figure 2; the phase change diagram of the signal is calculated by using the formula (1) in the invention. Referring to fig. 3, fig. 3 is a signal phase change diagram obtained by using hilbert transform, and it can be seen from the diagram that a sudden change occurs in the phase at the position indicated by the arrow, which is caused by the inner wall of the pipe encountered during the propagation of the ultrasonic signal, and the thickness of the pipe calculated by using the two-way travel time formula (2) is 5mm, which is consistent with the thickness of the pipe in the experiment.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.