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Health state prediction method for industrial equipment in noise environment

A technology of industrial equipment and health status, applied in computer-aided design, design optimization/simulation, calculation, etc.

Active Publication Date: 2020-06-05
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the defects in the above-mentioned prior art, and proposes a method for predicting the health status of industrial equipment in a noisy environment. The sequence data samples of the model are removed to build a more accurate prediction model

Method used

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  • Health state prediction method for industrial equipment in noise environment
  • Health state prediction method for industrial equipment in noise environment
  • Health state prediction method for industrial equipment in noise environment

Examples

Experimental program
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specific Embodiment 1

[0099] The simulation experiment is carried out with a turbofan engine. This experiment uses a data set generated by a turbofan engine simulation program, Commercial Modular Aviation Propulsion System Simulation (C-MAPSS), to verify the effectiveness of the method of the present invention.

[0100] This dataset contains four subsets, denoted by FD001, FD002, FD003 and FD004. Each subset contains a training set and a test set. The training set contains the life cycle monitoring data of 21 sensors and 3 operating condition sensors of multiple engines of the same type. In subsets FD001 and FD003, the operating conditions experienced by each engine remained constant, while in FD002 and FD004, the operating conditions were constantly changing. Therefore, the input sequences of subsets FD002 and FD004 contain operating condition sensor data, but FD001 and FD003 do not. So we merged FD001 and FD003 into one dataset, and FD002 and FD004 into another dataset, denoted by FD013 and FD...

specific Embodiment 2

[0120] The present invention uses real monitoring data of a milling machine to verify the effectiveness of the proposed method. In this embodiment, the monitoring data obtained by six sensors are used to predict the wear amount of the milling cutter.

[0121] This data set contains 16 knives, each of which has undergone different working times, and six sensors have recorded 9000 data points in each work, and only use the last 5000 data points in the steady working state to predict the current milling Knife wear. In this embodiment, only the data of No. 7, No. 13, No. 3 and No. 11 knives are selected, because these knives have the largest amount of data. Table 3 shows the experimental conditions of these four knives, which belong to two different experimental conditions, so two sets of experiments are designed to analyze the data of these two experimental conditions respectively. Knife No. 13 and No. 11 are used as training sets to build the model, and No. 7 and No. 3 knives ...

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Abstract

The invention provides a health state prediction method for industrial equipment in a noise environment, and the method is carried out based on deep learning and unsupervised noise sample detection, and comprises the steps: obtaining noise-containing monitoring data through employing a sensor disposed on the industrial equipment; generating a plurality of sequence data samples based on the noise-containing monitoring data by using a sliding time window of which the window size is stw; generating an attention weight vector alpha T for each sequence data sample by using a conversion model with an attention mechanism; clustering the alpha T based on a bottom-up hierarchical clustering algorithm of an average connection algorithm, removing a sequence data sample corresponding to the alpha T inthe abnormal class, and training an LSTM prediction model by using the remaining sequence data samples; predicting the health state of the industrial equipment by using the trained LSTM prediction model. According to the method, the multivariable input sequence is converted into the attention weight vector related to prediction, hierarchical clustering is carried out on the attention weight vector, and the noise sample is detected and removed, so that the accuracy of the prediction model is higher.

Description

technical field [0001] The invention relates to the technical field of industrial equipment health prediction, and relates to a method for predicting the health state of industrial equipment in a noisy environment, in particular to an unsupervised noise sample detection method for industrial equipment health state prediction. Background technique [0002] With the development of sensor technology, a large amount of monitoring data of equipment can be obtained to predict its health status. Compared with traditional forecasting methods based on signal processing, methods based on deep learning can process large amounts of data without requiring too much manual operation and professional domain knowledge. Many deep learning models have been used to predict the remaining life of devices, such as multi-layer perceptron models, convolutional neural networks, recurrent neural networks, and long short-term memory networks. Sliding time window methods are widely used to generate seq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/04
Inventor 林焱辉常亮
Owner BEIHANG UNIV