EMD decomposition and AR model residual error based structural damage early-warning method

A technology of structural damage and AR model, which is applied in the fields of instrumentation, calculation, electrical and digital data processing, etc. It can solve problems such as unreliable results, and achieve the effect of wide application range, strong operability, and high computational efficiency.

CN105631213AActive Publication Date: 2016-06-01QINGDAO TECHNOLOGICAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-06-01

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Abstract

The invention relates to the field of structural damage identification and provides an EMD decomposition and AR model residual error based structural damage early-warning method According to the method, an EMD is utilized to decompose actually-measured acceleration response signals into a plurality of intrinsic mode functions containing single frequency components, then an AR model is utilized to conduct fitting on two large-energy intrinsic mode functions IMF, residual errors of the AR model are extracted, an elliptic control equation is established according to variances of the residual errors of the AR model, and structural damage early-warning is performed by utilizing the elliptic control equation. Compared with an existing structural damage identification method based on vibration, the structural damage early-warning method directly utilizes nonlinear and non-stationary acceleration response signals to perform structural damage early-warning, does not need a standard finite element model and modal parameters, is not influenced by uncertainty factors, such as nonlinear and non-stationary actually measured response signals, incomplete modal parameters and measurement noise, belongs to a data-driven method and is high in calculation efficiency, good in operability and wider application range.
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Description

technical field

[0001] The invention relates to the field of structural damage identification, in particular to a civil engineering structure damage early warning method based on vibration response signal processing technology. Background technique

[0002] Modern civil engineering structures continue to show the trend of large-scale, complex and diversified. Due to the impact of environmental erosion, material aging and load effects, civil engineering structures will be damaged to varying degrees during the service period. If the damage is not detected and dealt with in time, once the damage of some key components of the structure accumulates to a certain would expand rapidly, compromising the security of the entire structure, with catastrophic consequences. Therefore, it is necessary to conduct structural damage identification and health monitoring research.

[0003] In recent years, the vibration-based structural damage identification method has developed rapidly. Since...

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Embodiment Construction

[0026] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] figure 1 It is a flowchart of a structural damage early warning method based on EMD decomposition and AR model residual provided by an embodiment of the present invention. The structural damage early warning method includes the following steps:

[0028] Step 1: Obtain acceleration response signals x(t) and x'(t) of the same node before and after structural damage.

[0029] Step 2: Use EMD to decompose the obtained acceleration response signal x(t) before structural damage, and obtain the decomposition formula of x(t):

[0030] x ( t ) = Σ i = 1 n c i + r n - - - ...