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CN-122015990-A - Gas ultrasonic flowmeter system with fault diagnosis function

CN122015990ACN 122015990 ACN122015990 ACN 122015990ACN-122015990-A

Abstract

The invention discloses a gas ultrasonic flowmeter system with fault diagnosis. Relates to the technical field of ultrasonic flow meters. The system comprises a measuring module, a data acquisition module, a fault diagnosis module and a decision output module, wherein an ultrasonic sensor is arranged in the measuring module and used for measuring the flowing state of gas in a sound channel, the data acquisition module acquires actual measured sound velocity, temperature, pressure and sensor working state parameters according to the flowing state of the gas and performs preprocessing, the fault diagnosis module performs fault diagnosis on the gas ultrasonic flowmeter according to the preprocessed data to obtain a fault diagnosis result, and the decision output module outputs an early warning prompt according to the fault diagnosis result. The invention solves the problems of one-sided measurement, data distortion, inaccurate diagnosis and inconvenient operation and maintenance of the traditional gas ultrasonic flowmeter fault diagnosis system, and greatly improves the running reliability and metering accuracy of the flowmeter.

Inventors

  • SU YINGXIN

Assignees

  • 辽东学院

Dates

Publication Date
20260512
Application Date
20260225

Claims (7)

  1. 1. The gas ultrasonic flowmeter system with fault diagnosis is characterized by comprising a measurement module, a data acquisition module, a fault diagnosis module and a decision output module; The measuring module is internally provided with an ultrasonic sensor and is used for measuring the flow state of the gas in the sound channel; the data acquisition module acquires actually measured sound velocity, temperature, pressure and working state parameters of a sensor according to the gas flow state and performs pretreatment; the fault diagnosis module performs fault diagnosis on the gas ultrasonic flowmeter according to the preprocessed data to obtain a fault diagnosis result; And the decision output module outputs an early warning prompt according to the fault diagnosis result.
  2. 2. The gas ultrasonic flowmeter system with fault diagnosis according to claim 1, wherein the ultrasonic sensor adopts a multi-channel distributed arrangement structure, and comprises at least two groups of ultrasonic transducers arranged in pairs, wherein each group of ultrasonic transducers respectively corresponds to different measurement channels preset on the flowmeter body and outputs corresponding original echo signals for measuring the flow states of the gas of the different measurement channels.
  3. 3. The ultrasonic gas flowmeter system with fault diagnosis according to claim 2, wherein the data acquisition module comprises a state identification unit, a multi-parameter synchronous acquisition unit and a data preprocessing unit; The state identification unit is used for receiving an original echo signal of the ultrasonic sensor, extracting time domain characteristics and frequency domain characteristics of the original echo signal, judging the gas flow state type through a preset threshold value, starting corresponding acquisition modes aiming at different flow states by the multi-parameter synchronous acquisition unit, and carrying out outlier rejection, data calibration, data normalization and data compression processing on acquired data by the data preprocessing unit.
  4. 4. A gas ultrasonic flow meter system with fault diagnosis as claimed in claim 3, The acquisition process of the actually measured sound velocity comprises the steps that a multi-parameter synchronous acquisition unit receives the transmitting signals and the receiving signals of each group of ultrasonic transducers, calculates the signal transmission time difference based on a cross-correlation algorithm, and calculates the actually measured sound velocity by combining the length of a sound channel, wherein the formula is as follows: ; Wherein L is the length of a sound channel, and t Cis-cis 、t Reverse direction is the forward and backward transmission time of an ultrasonic signal respectively; the acquisition process of the temperature parameter comprises the steps of arranging a temperature sensor in a flowmeter pipeline to output the temperature of a gas medium; the process for acquiring the pressure parameters comprises the steps of acquiring a real-time pressure value of a gas medium through a pipeline pressure sensor, and performing voltage stabilizing filtering treatment on a pressure signal in the acquisition process to eliminate pressure fluctuation interference caused by pipeline vibration; the acquisition process of the working state parameters of the sensor comprises the steps of acquiring the transmitting power, the receiving signal amplitude, the impedance matching value and the working voltage and current of the ultrasonic transducer, and simultaneously recording the accumulated working time length of the sensor to form a basic data set of the health state of the sensor.
  5. 5. The ultrasonic gas flowmeter system with fault diagnosis according to claim 3, wherein said fault diagnosis module comprises a feature extraction unit, a parallel diagnosis unit, a result fusion unit, and a fault level determination unit; The characteristic extraction unit is used for receiving the preprocessed data and extracting static characteristics and dynamic time sequence characteristics in the data, wherein the static characteristics comprise sound velocity deviation rate, temperature fluctuation coefficient and pressure fluctuation coefficient, and the dynamic time sequence characteristics comprise time sequence change slope of sensor working state parameters; The parallel diagnosis unit comprises a multi-layer sensing machine subunit and a gating attention network subunit, wherein static characteristics are input into the multi-layer sensing machine subunit to output fault type probability distribution; The result fusion unit sets a weight coefficient based on the historical diagnosis accuracy of each subunit according to the various diagnosis results output by the parallel diagnosis unit, completes result fusion through a weighted voting method to obtain candidate diagnosis results, judges whether secondary diagnosis is triggered or not through a preset consistency check threshold value, and re-invokes the feature extraction unit to supplement extracted features and then performs diagnosis again if the consistency of each primary diagnosis result is lower than the threshold value; The fault grade judging unit carries out grade division on the candidate diagnosis results to obtain fault grades, packages the fault type, the fault grade, the measuring sound channel position corresponding to the fault and the fault duration into fault diagnosis results, and transmits the fault diagnosis results to the decision output module.
  6. 6. The gas ultrasonic flowmeter system with fault diagnosis according to claim 5, wherein the multi-layer perceptron subunit adopts a fully-connected network architecture of an input layer, a hidden layer and an output layer, the number of neurons of the input layer is consistent with the dimension of static characteristics, the hidden layer is provided with 2 layers, the number of neurons of each layer is 2-3 times that of the input layer, a ReLU activation function is adopted, the number of neurons of the output layer is matched with the number of preset fault types, and a Softmax activation function is adopted; The gating attention network subunit adopts a combined framework of the GRU gating unit and the attention mechanism, screens effective time sequence information and focus fault related key feature points of the attention mechanism through the gating unit, outputs the fault occurrence time, duration and relevance values of time sequence feature parameters, and independently and parallelly operates the multi-layer perception machine subunit and the gating attention network subunit, and synchronously transmits output results of the GRU gating unit and the attention mechanism to the result fusion unit.
  7. 7. The ultrasonic gas flowmeter system with fault diagnosis as set forth in claim 1, further comprising a power module, a communication module, and a memory module, The power supply module is used for providing stable working voltage for the measuring module, the data acquisition module, the fault diagnosis module and the decision output module, the communication module is used for realizing local transmission of early warning signals of the decision output module and sending of remote warning signals, and the storage module is used for storing fault diagnosis results and early warning prompt information.

Description

Gas ultrasonic flowmeter system with fault diagnosis function Technical Field The invention relates to the technical field of ultrasonic flow meters, in particular to a gas ultrasonic flow meter system with fault diagnosis. Background The traditional gas ultrasonic flowmeter fault diagnosis system mainly adopts a single-channel or unreasonable sensor arrangement mode, gas flow states of different channels cannot be comprehensively captured, so that original data support of fault diagnosis is insufficient, the existing system lacks a targeted acquisition mode aiming at different gas flow states, the acquisition and calculation modes of key parameters are not standard, so that data quality input into the fault diagnosis module is poor, and diagnosis accuracy is affected. The traditional diagnosis scheme adopts a single model, cannot simultaneously consider static parameters and dynamic time sequence characteristics, and lacks an effective diagnosis result fusion and consistency verification mechanism, so that inaccurate fault type identification and fuzzy fault moment positioning are caused, and the accurate diagnosis requirement under complex working conditions is difficult to meet. Part of the existing systems do not define inter-module data interaction logic, and support of auxiliary modules such as stable power supply, remote communication and data storage is lacking, so that the system is poor in operation stability, failure early warning information is difficult to transfer efficiently, and the remote monitoring and operation and maintenance requirements of an industrial scene cannot be adapted. In summary, the existing gas ultrasonic flowmeter fault diagnosis system has the problems of incomplete measurement, poor data quality, low diagnosis precision, insufficient system stability and the like, and is difficult to meet the reliability guarantee requirement of industrial-grade gas metering. Therefore, it is necessary to provide a gas ultrasonic flowmeter system with clear architecture, standard data processing and accurate fault diagnosis. Disclosure of Invention In view of the above, the invention provides a gas ultrasonic flowmeter system with fault diagnosis, which effectively solves the problems of one-sided measurement, data distortion, inaccurate diagnosis and inconvenient operation and maintenance of the traditional gas ultrasonic flowmeter fault diagnosis system, and greatly improves the running reliability and metering accuracy of the flowmeter. In order to achieve the above purpose, the present invention adopts the following technical scheme: the gas ultrasonic flowmeter system with fault diagnosis comprises a measurement module, a data acquisition module, a fault diagnosis module and a decision output module; The measuring module is internally provided with an ultrasonic sensor and is used for measuring the flow state of the gas in the sound channel; the data acquisition module acquires actually measured sound velocity, temperature, pressure and working state parameters of a sensor according to the gas flow state and performs pretreatment; the fault diagnosis module performs fault diagnosis on the gas ultrasonic flowmeter according to the preprocessed data to obtain a fault diagnosis result; And the decision output module outputs an early warning prompt according to the fault diagnosis result. Preferably, the ultrasonic sensor adopts a multi-channel distributed arrangement structure, and comprises at least two groups of ultrasonic transducers arranged in a pairing mode, wherein each group of ultrasonic transducers respectively corresponds to different measurement channels preset on the flowmeter body and outputs corresponding original echo signals for measuring the flow states of gases of the different measurement channels. Preferably, the data acquisition module comprises a state identification unit, a multi-parameter synchronous acquisition unit and a data preprocessing unit; The state identification unit is used for receiving an original echo signal of the ultrasonic sensor, extracting time domain characteristics and frequency domain characteristics of the original echo signal, judging the gas flow state type through a preset threshold value, starting corresponding acquisition modes aiming at different flow states by the multi-parameter synchronous acquisition unit to obtain original data, and carrying out outlier rejection, data calibration, data normalization and data compression processing on the acquired original data by the data preprocessing unit. Preferably, the raw data comprise measured sound velocity, temperature parameters, pressure parameters and sensor working state parameters; The acquisition process of the actually measured sound velocity comprises the steps that a multi-parameter synchronous acquisition unit receives the transmitting signals and the receiving signals of each group of ultrasonic transducers, calculates the signal transmission time difference based on a cros