Derrick Steel Structure Damage Identification Method Based on IMF Instantaneous Energy Curvature Difference

A technology for instantaneous energy and damage identification, applied in the field of signal processing, can solve the problem of difficulty in obtaining high-order modal parameters of large and complex steel structures, and achieve good stability.

Active Publication Date: 2019-09-27
YANSHAN UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application testing, it is difficult to obtain high-order modal parameters of large and complex steel structures

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Derrick Steel Structure Damage Identification Method Based on IMF Instantaneous Energy Curvature Difference
  • Derrick Steel Structure Damage Identification Method Based on IMF Instantaneous Energy Curvature Difference
  • Derrick Steel Structure Damage Identification Method Based on IMF Instantaneous Energy Curvature Difference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] The present invention will be further described below in conjunction with accompanying drawing:

[0054] The derrick steel structure finite element model that the present invention adopts is as figure 2 As shown, the main nodes of the right front column of the model are nodes 1 to 20 from bottom to top. Assuming that there is a unit between the two nodes, they are divided into units 1 to 19 from bottom to top.

[0055] Such as figure 1 Shown, method of the present invention comprises the following steps:

[0056] Step 1. Perform modal analysis on the derrick steel structure to determine the low-order vibration mode of the derrick steel structure, and perform transient dynamic analysis on the derrick steel structure to extract the vibration responses of different parts;

[0057] The modal analysis is carried out on the steel structure of the derrick, and the vibration shapes and frequencies of the first 4 orders of the model are extracted. Such as image 3 As shown,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a derrick steel structure damage identification method based on an IMF (Intrinsic Mode Function) instantaneous energy curvature difference value. The method comprises the following steps of: carrying out modal analysis on a derrick steel structure to determine the low-order vibration modal of the derrick steel structure, and carrying out transient dynamic analysis on the derrick steel structure to extract the vibration responses of different positions of the derrick steel structure; utilizing a band-pass filtering method to extract the low-order vibration signals of different positions of the derrick steel structure, carrying out EMD (Empirical Mode Decomposition) decomposition on the low-order vibration signals to select main IMF components, and adopting a central difference method to calculate the IMF instantaneous energy curvature; and taking the IMF instantaneous energy curvature difference value obtained before and after the derrick steel structure is damaged as a damage sensitive index so as to realize the identification and the analysis of derrick steel structure damage positions and degrees. By use of the method, only the low-order vibration information of the derrick steel structure needs to be used for realizing damage position identification, identification accuracy is high, and the problem that the damage can not be accurately identified since large complex steel structure high-order vibration information is difficult in obtaining is solved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method for identifying damage to a steel structure of a derrick based on an IMF instantaneous energy curvature difference using HHT signal feature extraction technology. Background technique [0002] With the development of signal processing technology, damage detection methods based on structural signal feature extraction are more and more widely used. Such methods use vibration sensors to collect the vibration response of structures, and adopt appropriate signal processing methods to extract damage sensitivity indicators, and then structures for damage detection or health monitoring. [0003] In 1998, N.E.Huang proposed the Hilbert-Huang Transform (HHT) method, and proved that it has stronger decomposition ability than the wavelet transform method HHT in many fields. The HHT method consists of two parts: empirical mode decomposition (EMD) and Hilbert transform. The...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 韩东颖魏世民时培明魏庆王斌高凯
Owner YANSHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products