Abnormal Monitoring Data Detection Based on Matrix Manipulation and the Cuckoo Search Algorithm

Abstract

Structural health monitoring is an effective method to evaluate the safety status of dams. Measurement error is an important factor which affects the accuracy of monitoring data modeling. Processing the abnormal monitoring data before data analysis is a necessary step to ensure the reliability of the analysis. In this paper, we proposed a method to process the abnormal dam displacement monitoring data on the basis of matrix manipulation and Cuckoo Search algorithm. We first generate a scatter plot of the monitoring data and exported the matrix of the image. The scatter plot of monitoring data includes isolate outliers, clusters of outliers, and clusters of normal points. The gray scales of isolated outliers are reduced using Gaussian blur. Then, the isolated outliers are eliminated using Ostu binarization. We then use the Cuckoo Search algorithm to distinguish the clusters of outliers and clusters of normal points to identify the process line. To evaluate the performance of the proposed data processing method, we also fitted the data processed by the proposed method and by the commonly used 3-σ method using a regression model, respectively. Results indicate that the proposed method has a better performance in abnormal detection compared with the 3-σ method.

Investigating the Influence of Non-Uniform Characteristics of Layered Foundation on Ground Vibration Using an Efficient 2.5D Random Finite Element Method

“…Ma et al [32] established the governing equation for the dynamic response of gradient non-uniform soil under a moving load and analyzed the influence of soil non-uniformity using the back propagation ray matrix method. Although not commonly used, other methods, such as the finite difference method and differential quadrature method [33][34][35], are also useful for the further study of the ground vibration caused by train loads. It is shown in these studies that the non-uniform characteristics of ground soil is of great significance and worth considering to understand the special characteristics and propagation of the ground vibration.…”

A Numerical Analysis of the Non-Uniform Layered Ground Vibration Caused by a Moving Railway Load Using an Efficient Frequency–Wave-Number Method

“…The Weibull function used in this article makes it possible to easily take into account the foundation non-uniformity. For further investigation, it is a good idea to consider stochastic field theory [48] and some other distribution models proposed on the basis of in situ tests and back-analysis [49][50][51][52]. Furthermore, it can be found from Figure 15 that, for beta = 2, which indicates weaker ground homogeneity, ground acceleration has a limited increment when the train speed increases from 94.5 m/s to 130 m/s at an 8 m distance.…”

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“…If affirmative, output the current optimal individual's location. If negative, repeat operations from step (2) to step (5). (7) Obtain the parameters corresponding to the minimum fitness as the optimal parameters for the VMD algorithm.…”

“…The findings seem to demonstrate the concrete panel is much stiffer than the rockfill body, which leads to myriad problems in compatibility and deformation of the two. The foremost problems are the facts that a large or uneven settlement under load appears in the dam [4,5]. A challenging problem that arises in this domain is that large settlements can cause cracks in the concrete panel and damage the water stop, which then affects the dam safety [6,7].…”