A method and device for life prediction of a balanced control module based on health indicators

A technology of balanced control and health indicators, applied in general control systems, control/regulation systems, testing/monitoring control systems, etc., and can solve problems such as remaining service life prediction and aging of difficult systems

Active Publication Date: 2021-05-14
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the balance control module usually operates in the state of switching between different working conditions, and the collected data is data of multiple components. At this time, the data does not have an obvious aging trend, and it is difficult to predict the remaining service life of the system under multiple working conditions.
Many studies directly use learning-based methods for life prediction. However, this method largely depends on the completeness of the data set. The aging information hidden in the mode switching rules is rarely mined, and it is difficult to derive explanatory information based on the aging model. Therefore, a life prediction method and device suitable for the balance control module need to be studied

Method used

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  • A method and device for life prediction of a balanced control module based on health indicators
  • A method and device for life prediction of a balanced control module based on health indicators
  • A method and device for life prediction of a balanced control module based on health indicators

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Embodiment 1

[0068] This embodiment discloses a method for predicting the life of a balance control module based on health indicators, including the following steps:

[0069] Step S1: Based on the data of the brake balance control module in each action, extract its eigenvalues ​​at each action;

[0070] Step S2: Construct a health index model, determine the model parameters based on the eigenvalues ​​of the samples of the brake balance control module; Health indicators at the time;

[0071] Step S3: Construct a life prediction model, based on the health index sequence and the remaining service life sequence of the samples of the brake equalization control module (marking the remaining service life of each sample in each action = the total action of the sample in the entire life cycle Number of times - the number of actions the sample has performed during this action, such as the sample life cycle, that is, the total number of actions from healthy to fault is 100, then the remaining servic...

Embodiment 2

[0074] This embodiment is on the basis of embodiment 1, as figure 1 As shown, the feature extraction in the step S1 specifically includes the following steps:

[0075]Step S1.1, extracting static features:

[0076] Based on the driving current curve of each solenoid valve in each action of the brake balance control module, a set of aging characteristics of the solenoid valve is extracted. The aging characteristics of the solenoid valve include the statistical characteristics and energy characteristics of the driving current; the statistical characteristics of the driving current include the response time Δt, local peak value I, local valley value I', stable current value Among them, the energy characteristic is to use the empirical mode decomposition to decompose the driving current curve into Z intrinsic mode function components And the calculated components of each intrinsic mode function energy e z ,Calculated as follows:

[0077]

[0078] Where L is the number o...

Embodiment 3

[0093] In this embodiment, on the basis of Embodiment 1, in the step S2, the purpose of the health index model is to fuse the accumulated dynamic feature sequence to obtain the health index representing the aging state (system degradation trend) of the balance control module. Considering that the cumulative dynamic feature F consists of each part (F 1 , F 2 , F 3 , F 4 ) are multi-dimensional, let K be the total dimension of the cumulative dynamic feature, that is, the number of features it contains, then the cumulative dynamic feature corresponding to the balance control module’s t-time action can be expressed as F(t)=(f 1 (t), f 2 (t),...,f K (t)), the health index is expressed as a linear combination of features, that is, the constructed health index model is:

[0094] H(t)=w 1 f 1 (t)+w 2 f 2 (t)+...w k f k (t)+...+w K f K (t)

[0095] Among them, H(t) is the health index of the balance control module at the tth action, w 1 ,w 2 ,...,w k ,...,w K Indicate...

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Abstract

The invention discloses a method and device for life prediction of a balance control module based on a health index. The method includes the following steps: Step S1: Based on the data of the balance control module in each operation, calculate its characteristics in each operation value; Step S2: Construct a health index model, determine the model parameters based on the eigenvalues ​​of the balance control module samples; and based on the extracted eigenvalues, use the health index model after parameter determination to calculate the health indicators of the balance control module in each action ;Step S3: Build a life prediction model, train the prediction model parameters based on the health index sequence and the remaining service life sequence of the balanced control module sample, and obtain the trained life prediction model; Step S4: Put the historical health indicators of the balanced control module to be tested The sequence is input to the trained life prediction model, and its remaining service life is output. The invention can predict the service life of the balance control module with high accuracy.

Description

technical field [0001] The invention relates to the field of life prediction for a railway locomotive braking system, in particular to a method and device for life prediction of a brake equalization control module based on a health index. Background technique [0002] With the rapid development of the rail transportation industry, electropneumatic brakes (such as a new generation of electropneumatic brakes - DK-2 braking system) are widely used in railway transportation, and the balance control module is used to achieve balance The closed-loop control of the air cylinder pressure, as a key module to ensure the safe operation of the brake, has received extensive attention from researchers at home and abroad for its life prediction. [0003] The traditional life prediction technology mainly focuses on the research of a single component. Because the working condition of a single component is single and the aging trend is more obvious, it is better to predict. However, the bala...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
CPCG05B23/0283
Inventor 彭军王胜男黄志武杨迎泽李恒蒋富张晓勇刘伟荣程亦君顾欣
Owner CENT SOUTH UNIV
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