阅读说明：本技术 燃气调压器的故障检测方法及装置 (Fault detection method and device for gas pressure regulator ) 是由 雷岩 刘瑶 谭松玲 苏峥 李梦媛 于 2019-09-27 设计创作，主要内容包括：提供一种燃气调压器的故障检测装置和故障检测方法,其特征在于,故障检测装置包括：多个燃气调压器,其设置在同一燃气管道上,每个燃气调压器上设置有多个声发射传感器,每个声发射传感器获得来自所述多个燃气调压器的声发射信号；上位机,其被构造为利用最优权矢量校正所述多个声发射传感器中的每一个获得的声发射信号,以得到所述声发射传感器所在的燃气调压器发出的实际源信号,并根据所述实际源信号进行频谱和包络谱分析,以确定发生故障的燃气调压器和故障类型；其中,利用快速独立成分分析算法得到所述最优权矢量。(The utility model provides a fault detection device and fault detection method of gas pressure regulator which characterized in that, fault detection device includes: the gas pressure regulators are arranged on the same gas pipeline, each gas pressure regulator is provided with a plurality of acoustic emission sensors, and each acoustic emission sensor acquires acoustic emission signals from the gas pressure regulators; the upper computer is configured to correct the acoustic emission signals obtained by each acoustic emission sensor by using an optimal weight vector so as to obtain actual source signals sent by a gas pressure regulator where the acoustic emission sensor is located, and perform frequency spectrum and envelope spectrum analysis according to the actual source signals so as to determine the gas pressure regulator with faults and the fault type; and obtaining the optimal weight vector by utilizing a rapid independent component analysis algorithm.)

1. A fault detection device of a gas pressure regulator is characterized by comprising:

the gas pressure regulators are arranged on the same gas pipeline, each gas pressure regulator is provided with a plurality of acoustic emission sensors, and each acoustic emission sensor acquires acoustic emission signals from the gas pressure regulators;

the upper computer is configured to correct the acoustic emission signals obtained by each acoustic emission sensor by using an optimal weight vector so as to obtain actual source signals sent by a gas pressure regulator where the acoustic emission sensor is located, and perform frequency spectrum and envelope spectrum analysis according to the actual source signals so as to determine the gas pressure regulator with faults and the fault type;

and obtaining the optimal weight vector by utilizing a rapid independent component analysis algorithm.

2. A method of fault detection for a gas pressure regulator, the method comprising:

obtaining acoustic emission signals from a plurality of gas pressure regulators with a plurality of acoustic emission sensors mounted on each of the plurality of gas pressure regulators;

correcting the acoustic emission signal obtained by each acoustic emission sensor by using the optimal weight vector to obtain an actual source signal sent by the gas pressure regulator where the acoustic emission sensor is located, and performing frequency spectrum and envelope spectrum analysis according to the actual source signal to determine the gas pressure regulator with the fault and the fault type;

and obtaining the optimal weight vector by utilizing a rapid independent component analysis algorithm.

3. The fault detection method according to claim 2, wherein the optimal weight vector is obtained by using a fast independent component analysis algorithm by:

performing centering processing on the plurality of acoustic emission signals to enable the average value to be 0;

whitening the acoustic emission signal after the centralization treatment to obtain data Z;

setting a weight vector of initial iteration as a Gaussian matrix, wherein the iteration number p is 1;

recalculating a new weight vector according to the nonlinear function g, the weight vector and the data Z, judging whether the new weight vector is converged, if so, taking the new weight vector as an optimal weight vector, and otherwise, continuing iteration until the new weight vector is converged; and finally acquiring the optimal weight vector.

Technical Field

The invention relates to the technical field of fault detection, in particular to a fault detection method and device for a gas pressure regulator.

Background

In recent years, acoustic emission technology has been widely used for medium and low pressure safety monitoring of pipeline or valve leakage and the like due to its high sensitivity and high identification rate. When the high-voltage ring network gas pressure regulator has a fault, the pressure intensity of inlet and outlet gas is not changed greatly, but faults such as cracks, gas leakage and the like can generate abnormal and obvious acoustic emission signals in the process of operation, and the frequency spectrum range of the abnormal signals is wide, so that the application of an acoustic emission detection technology in the process of detecting the high-voltage pressure regulator is restrained.

However, for the actual situation of the gas pressure regulators, a plurality of gas pressure regulators can be operated simultaneously on the same branch, and the plurality of gas pressure regulators are connected with each other through pipelines, so that the plurality of gas pressure regulators can vibrate simultaneously to generate acoustic emission signals and influence each other in the operation process, the acquired acoustic emission signals are aliasing signals, and the gas pressure regulators with faults and the corresponding fault types of the gas pressure regulators cannot be accurately detected through the aliasing signals.

Disclosure of Invention

The utility model provides a fault detection device of gas pressure regulator, its characterized in that includes:

the gas pressure regulators are arranged on the same gas pipeline, each gas pressure regulator is provided with a plurality of acoustic emission sensors, and each acoustic emission sensor acquires acoustic emission signals from the gas pressure regulators;

the upper computer is configured to correct the acoustic emission signals obtained by each acoustic emission sensor by using an optimal weight vector so as to obtain actual source signals sent by a gas pressure regulator where the acoustic emission sensor is located, and perform frequency spectrum and envelope spectrum analysis according to the actual source signals so as to determine the gas pressure regulator with faults and the fault type;

and obtaining the optimal weight vector by utilizing a rapid independent component analysis algorithm.

The present disclosure provides a fault detection method for a gas pressure regulator, which is characterized in that the method includes:

obtaining acoustic emission signals from a plurality of gas pressure regulators with a plurality of acoustic emission sensors mounted on each of the plurality of gas pressure regulators;

correcting the acoustic emission signal obtained by each acoustic emission sensor by using the optimal weight vector to obtain an actual source signal sent by the gas pressure regulator where the acoustic emission sensor is located, and performing frequency spectrum and envelope spectrum analysis according to the actual source signal to determine the gas pressure regulator with the fault and the fault type;

and obtaining the optimal weight vector by utilizing a rapid independent component analysis algorithm.

According to an embodiment of the present disclosure, the step of obtaining the optimal weight vector using a fast independent component analysis algorithm includes:

performing centering processing on the plurality of acoustic emission signals to enable the average value to be 0;

whitening the acoustic emission signal after the centralization treatment to obtain data Z;

setting a weight vector of initial iteration as a Gaussian matrix, wherein the iteration number p is 1;

recalculating a new weight vector according to the nonlinear function g, the weight vector and the data Z, judging whether the new weight vector is converged, if so, taking the new weight vector as an optimal weight vector, and otherwise, continuing iteration until the new weight vector is converged; and finally acquiring the optimal weight vector.

Drawings

Fig. 1 is a schematic diagram of a fault detection device of a gas pressure regulator according to an embodiment of the present invention.

Fig. 2 is a flowchart of a method for detecting a fault of a gas pressure regulator according to an embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic diagram of a fault detection device of a gas pressure regulator according to an embodiment of the present invention, which is composed of a plurality of acoustic emission sensors, a data acquisition card, and an upper computer. As shown in fig. 1, two acoustic emission sensors respectively and synchronously acquire data of a monitoring station gas pressure regulator and an operation station gas pressure regulator on the same gas pipeline, and transmit the acquired data to an upper computer through a data acquisition card. For example, acoustic emission sensors A and B are provided on a running board gas pressure regulator, and acoustic emission sensors C and D are provided on a monitoring board gas pressure regulator.

According to the embodiment of the present disclosure, a plurality of gas pressure regulators can be arranged on the same gas pipeline, and a plurality of acoustic emission sensors can be arranged on each gas pressure regulator. The frequency response of each acoustic emission sensor ranges from 0.5Hz to 40kHz with a sampling rate of 0-96KHz for the data acquisition card.

Fig. 2 is a flowchart of a method for detecting a fault of a gas pressure regulator according to an embodiment of the present invention, where as shown in fig. 2, the method includes steps 201 to 203:

in 201, an acoustic emission signal of a gas pressure regulator is acquired.

In this step, an acoustic emission signal of a gas pressure regulator is obtained, the gas pressure regulator being located in the gas transmission pipeline. For example, an acoustic emission signal corresponding to a monitoring station gas pressure regulator or a runtime station gas pressure regulator is acquired.

The acoustic emission signals acquired in the step are acquired by corresponding acoustic emission sensors, and each acoustic emission sensor corresponds to a different gas pressure regulator. For example, acoustic emission sensors a and B correspond to a monitoring station gas pressure regulator, and acoustic emission sensors C and D correspond to a running station gas pressure regulator.

It is understood that acoustic emission can be defined as a physical phenomenon, where a transient elastic wave is generated by the rapid release of energy within an object or material, and the deformation or rupture of the material is due to the release of strain energy in the form of an elastic wave by internal or external forces. The acoustic emission technology is a dynamic nondestructive detection method based on acoustic emission phenomenon, is used for judging the internal damage degree of a structure, and is very suitable for long-term real-time equipment fault detection. Therefore, the step detects the fault of the gas pressure regulator by acquiring the acoustic emission signal of the gas pressure regulator.

In this step, the acoustic emission signals of the gas pressure regulators collected by the acoustic emission sensor may be acquired by the data acquisition card in fig. 1, so that the upper computer connected to the data acquisition card may display the acoustic emission signals, for example, the upper computer may display the acoustic emission signals of the gas pressure regulator on the operation desk collected by the acoustic emission sensor A, B, and the acoustic emission signals of the gas pressure regulator on the monitoring desk collected by the acoustic emission sensor C, D.

It should be noted that, the plurality of gas pressure regulators may vibrate at the same time to generate acoustic emission signals and affect each other, so that the acoustic emission signals acquired by each acoustic emission sensor in step 201 are aliasing signals (for example, the acoustic emission signals acquired by the acoustic emission sensor a further include the acoustic emission signal from the gas pressure regulator on the monitoring console), which may not accurately reflect the operation condition of the corresponding gas pressure regulator, and therefore, the acquired acoustic emission signals need to be processed, so as to acquire the actual source signals transmitted by the corresponding gas pressure regulators.

Therefore, according to the embodiment of the present disclosure, in 202, a fast independent component analysis algorithm is performed on the acoustic emission signal to obtain an optimal weight vector, so as to extract an actual source signal corresponding to the acoustic emission signal.

Specifically, when performing fast independent component analysis on the acoustic emission signal, the step may extract the actual source signal in the following manner (i.e., solve the signal aliasing problem): centralize the acoustic emission signal (here, the acoustic emission signal includes the acoustic emission signal from the acoustic emission sensor A, B, C, D) to a mean value of 0; whitening the acoustic emission signal after the centralization treatment to obtain data Z; setting a weight vector W of an initial iteration_pIs a Gaussian matrix, and the iteration number p is 1; according to a non-linear function g, a weight vector W_pRecalculating new weight vector W for data Z_p+1And determining a new weight vector W_p+1Whether the vector converges or not, if so, the vector is used as an optimal weight vector, otherwise, the iteration is continued until the vector converges; and finally acquiring the optimal weight vector.

Specifically, the step uses data Z, a non-linear function g, and a weight vector W_pWhen calculating a new weight vector, the following formula can be used

Where g in the formula is a non-linear function, here a negative entropy function by default.

And obtaining an actual source signal corresponding to the voltage regulator according to the optimal weight vector and the acoustic emission signal after the optimal weight vector is obtained. Specifically, in this step, when obtaining the actual source signal corresponding to the emission signal according to the optimal weight vector and the acoustic emission signal, the following formula may be adopted:

Y＝W_pX(t)

wherein Y in the formula denotes that a particular acoustic emission sensor (e.g., acoustic emission sensor a) acquires the actual source signal, W, emitted by the corresponding gas regulator (corresponding, the benchtop gas pressure regulator)_PRepresents the optimal weight vector, and x (t) represents the acoustic emission signal acquired by the acoustic emission sensor a. That is, in this step, the acoustic emission signal obtained by each of the acoustic emission sensors is corrected by using the optimal weight vector to obtain the actual source signal emitted by the gas pressure regulator where the acoustic emission sensor is located.

In 203, the actual source signal is subjected to spectrum and envelope spectrum analysis, and the failed gas pressure regulator and the corresponding fault type thereof are determined according to the analysis result.

When the faulty gas pressure regulator is determined according to the analysis result, the following method can be adopted: determining whether the analysis result of the frequency spectrum and the envelope spectrum of the source signal conforms to the preset fault characteristics; if so, determining that the source signal is a fault signal, otherwise, determining that the source signal is not the fault signal; and determining the gas pressure regulator with the fault according to the signal source of the fault signal, wherein the signal source is the acoustic emission sensor for acquiring the acoustic emission signal corresponding to the source signal.

For example, if the acoustic emission signal analyzed in step 203 is acquired by the acoustic emission sensor a, and the acoustic emission sensor a acquires an acoustic emission signal emitted by the operation table gas pressure regulator, if it is determined that the actual source signal corresponding to the acoustic emission signal is a fault signal, the step may determine that the faulty gas pressure regulator is the operation table gas pressure regulator.

In addition, when determining the fault type of the fault, the following method may be adopted in this step: and determining the fault type corresponding to the analysis result of the actual source signal as the fault type of the gas pressure regulator with the fault according to the corresponding relation between the preset analysis result and the fault type.

For example, if the preset corresponding relationship indicates that the analysis result 1 corresponds to the fault type a, the analysis result 2 corresponds to the fault type B, and so on, if the analysis result obtained in this step is the result 2, it may be determined that the fault type of the failed gas pressure regulator is the type B.

Therefore, the method and the device obtain the corresponding actual source signal by separating the acoustic emission signal, then analyze the obtained actual source signal to obtain the analysis result, and further determine the gas pressure regulator with the fault and the corresponding fault type according to the obtained analysis result, thereby solving the problem that the fault position and the fault type cannot be accurately detected due to the aliasing of the acoustic emission signals generated by a plurality of gas pressure regulators on the same branch, and further improving the accuracy of the detection of the fault position and the fault type.