Partial least square method-based pipeline corrosion prediction method under metro stray current

Abstract

The invention discloses a partial least square method-based pipeline corrosion prediction method under metro stray current. The method comprises the steps of 1, selecting a test point, and performing finite element simulation; 2, preprocessing data ; 3, obtaining a training sample; 4, selecting a first principal component pair; 5, carrying out regression of dependent variables and independent variables to principal components; 6, carrying out residual matrix replacement; 7, establishing a partial least square regression equation; 8, verifying cross validity; 9, removing redundant position variables, and selecting optimal sensor arrangement; and 10, testing the test sample. According to the method, the effective pipeline corrosion prediction current density is obtained through earth surface potential data obtained in the interval in combination with finite element simulation, the prediction regression equation is obtained according to the partial least square method, the corrosion condition of a pipeline is judged, the number of sensors is reduced, meanwhile, the prediction precision can be kept within the acceptable range, and the method has great practical significance for intuitively monitoring the corrosion condition of the pipeline and saving the cost.

Description

technical field [0001] The invention relates to the technical field of subway rail transit, in particular to a method for predicting pipeline corrosion under stray current of subway based on partial least square method. Background technique [0002] With the continuous development of society, my country's urbanization process is also in full swing, and the congestion problem caused by the urban transportation system cannot be underestimated. The urban rail transit system dominated by subways has the characteristics of large transport capacity, small footprint, environmental protection, safety and airtightness, etc. It is gradually relieving urban traffic pressure, improving residents' travel comfort, enhancing the city's image, and driving the linkage of the whole city. Catalyst for rapid development. At present, my country's subway mainly adopts DC750V or DC1500V DC traction power supply system. The traction substation provides traction current for the operation of subway ...

AI Technical Summary

Problems solved by technology

Long-term stray current leakage will cause serious electrochemical corrosion to the buried metal along the subway line, which will cause huge economic losses and bring huge hidden dangers to the safe travel of passengers

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