The Research of Gantry Crane Girder Damage Problem by Modal Analysis Method

2014 ◽  
Vol 578-579 ◽  
pp. 872-876
Author(s):  
Xiao Peng Nie ◽  
Xin Gang Li ◽  
Hong Wei Fan ◽  
Ke Qin Ding ◽  
Li Bin Xu
Keyword(s):  
Numerical Simulation ◽  
Wavelet Analysis ◽  
Static Analysis ◽  
Damage Identification ◽  
Three Dimensional ◽  
Gantry Crane ◽  
Analysis Method ◽  
Ansys Software ◽  
Vibration Equation ◽  
Damage Location

most crane damage identification of the work has focused on the static analysis, that can't explain whether the crane has a damage or not by this way. So the paper explained the modal signal to analysis this problem , Used 300 tons gantry crane’s beam for background and ANSYS software as a tool was used for numerical simulation. The purpose is to find difference between the damage beam of the crane and health one,because if there was a damage on the beam , the formations and frequency will be changed. This theory of analysis is based on the vibration equation. In order to illustrate it better, the wavelet analysis method as a tool has been used ,in this case the signal was filtered, we can judge the damage location from the three dimensional curve. The basic aim of this paper is to arrive at a better way to judge the damage.Through the above analysis, the results proved the author's idea, identify structural’s damage basically, but it still need further research.

The Feasibility Study of Vibration Transmissibility Applied to Structure Damage Identification

2013 ◽  
Vol 347-350 ◽  
pp. 107-110
Author(s):  
Sen Wu ◽  
Bin Wang ◽  
Hai Hua Zhang
Keyword(s):  
Numerical Simulation ◽  
Cantilever Beam ◽  
Feasibility Study ◽  
Structural Damage ◽  
Simulation Experiment ◽  
Damage Identification ◽  
Structure Damage ◽  
Damage Location ◽  
Identification Method ◽  
Vibration Transmissibility

In view of the defects of the traditional damage identification method based on vibration,the damage identification method based on vibration transmissibility is put forward. The feasibility of the vibration transmissibility applied to structural damage identification is analyzed by the numerical simulation experiment of a cantilever beam, the analysis results show that, vibration transmissibility contains the structure damage severity, damage location and other useful information, and all the information is favor of the damage identification.

Space Rigid Frame Damage Identification Method Based on Modal Analysis

2013 ◽  
Vol 351-352 ◽  
pp. 1244-1248
Author(s):  
Hong Yu Jia ◽  
Peng Fei Yue ◽  
Xiao Fei Wang
Keyword(s):  
Modal Analysis ◽  
Structural Damage ◽  
Vibration Mode ◽  
Damage Identification ◽  
Three Dimensional ◽  
Frame Structure ◽  
Space Frame ◽  
First Order ◽  
Damage Location ◽  
Rigid Frame

Space frame structure of no damage and injury finite element models were established with ANSYS, and analyze 3D curvature mode as well three-dimensional vibration mode variety rate of the space rigid frame based on modal analysis. Curvature mode and three-dimensional vibration mode variety rate as the labeled amount was selected and applied to structural damage. The calculated results showed that the first-order curvature mode not only identify against single or multiple damage location, but also determine the initial degree of injury, and the axial curvature mode is better than the horizontal curvature mode for damage identification; The calculated results also showed that the variety rate of the first-order vibration mode can identify against damage location. Methods were provided by identifying the space frame structural damage of the curvature mode or three-dimensional vibration mode variety rate.

Dynamic Buckling Simulation of Cylindrical Liquid Storage Tanks Subjected to Seismic Motions

2010 ◽  
Author(s):  
Akira Maekawa ◽  
Katsuhisa Fujita
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Large Deformation ◽  
Three Dimensional ◽  
Mesh Size ◽  
Buckling Analysis ◽  
Dynamic Buckling ◽  
Storage Tanks ◽  
Analysis Method ◽  
Liquid Storage

A three-dimensional and elastic-plastic dynamic buckling analysis method that takes into consideration fluid-structure coupling and large deformation is proposed in order to accurately simulate the seismic response of cylindrical liquid storage tanks. The results of a dynamic buckling experiment of a tank using seismic motions closely match those of numerical simulation by the proposed method. The mesh size of the analytical model greatly influences the buckling analysis results. Optimization of the size is also discussed.

The Study on the Basic Theory of Gold Seamless Pipe Welding Numerical Simulation

2013 ◽  
Vol 456 ◽  
pp. 467-470 ◽  
Author(s):  
Wen Chao Qin ◽  
Jian Ru Qi ◽  
Li Xin Wang ◽  
Wei Hong Ye
Keyword(s):  
Numerical Simulation ◽  
Theoretical Basis ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Field Analysis ◽  
Analysis Method ◽  
Seamless Pipe ◽  
Pipe Welding ◽  
Reasonable Choice ◽  
Gold Industry

Based on the theory of FEM, we have established a viable three-dimensional dynamic simulation of welding field analysis method, heat distribution with a double ellipse as a welding heat source, to establish a reasonable boundary conditions, which is a reasonable choice of welding numerical simulation provides a theoretical basis, laying the groundwork for welding numerical simulation analysis of the gold industry.

Gearbox Fault Diagnosis Research Based on Wavelet Transform

2013 ◽  
Vol 274 ◽  
pp. 233-236
Author(s):  
G.B. Yu ◽  
Y. Zhao ◽  
J.F. Nie ◽  
B. Dai ◽  
X.W. Song
Keyword(s):  
Wavelet Transform ◽  
Fault Diagnosis ◽  
Wavelet Analysis ◽  
Three Dimensional ◽  
Vibration Signal ◽  
Analysis Method ◽  
Failure Frequency ◽  
Gearbox Vibration ◽  
The Time Domain ◽  
Better Than

The principle and application of wavelet analysis and gearbox fault diagnosis are described in the paper. To the experimental measurement of gearbox vibration signal, the time-domain and frequency-domain signals are got by wavelet transform. Then it get a clearly gearbox vibration signal by wavelet de-noising. The residual signal processing and three-dimensional wavelet analysis, it get the failure frequency and determine the fault characteristics. By the experimental signal wavelet transform, it reflects that the wavelet analysis method is better than traditional Fourier transform, so it is an effective method of fault diagnosis.

scholarly journals Numerical Analysis of the Pivot Node in Fracture Problems

2018 ◽  
Vol 774 ◽  
pp. 473-478
Author(s):  
J. Garcia-Manrique ◽  
Daniel Camas ◽  
A. Lima-Rodriguez ◽  
Antonio González-Herrera
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Load Level ◽  
Mode I ◽  
Ansys Software ◽  
Narrow Region ◽  
Factors Influencing ◽  
Experimental Correlation ◽  
Dimensional Distribution ◽  
Main Factors

Recent studies have allowed us to identify a narrow region of the thickness of the crack front in fracture problems that presents interesting characteristics for the numerical-experimental correlation. Taking the three-dimensional distribution of the stress intensity factor (K) as a reference, we observe how it remains invariant and independent of the main factors influencing this type of analysis. This article presents a summary of how to identify this point through the numerical simulation of the problem and its relationship with parameters such as thickness, load level or angle of curvature. The simulations are carried out with the ANSYS software in an aluminium CT specimen subjected to a fracture loading process in mode I.

scholarly journals Wavelet transforms and their applications to MHD and plasma turbulence: a review

2015 ◽  
Vol 81 (6) ◽  
Author(s):  
Marie Farge ◽  
Kai Schneider
Keyword(s):  
Numerical Simulation ◽  
Wavelet Transform ◽  
Wavelet Analysis ◽  
Turbulent Flows ◽  
Coherent Structures ◽  
Wavelet Transforms ◽  
Three Dimensional ◽  
Plasma Turbulence ◽  
Orthogonal Wavelet ◽  
Orthogonal Wavelet Transform

Wavelet analysis and compression tools are reviewed and different applications for the study of MHD and plasma turbulence are presented. We introduce the continuous and the orthogonal wavelet transform and detail several statistical diagnostics based on the wavelet coefficients. We then show how to extract coherent structures out of fully developed turbulent flows using wavelet-based denoising. Finally some multiscale numerical simulation schemes using wavelets are described. Several examples for analysing, compressing and computing one-, two- and three-dimensional turbulent MHD or plasma flows are presented.

A Method of Damage Identification for Shear Buildings

2012 ◽  
Vol 166-169 ◽  
pp. 1484-1488
Author(s):  
Feng Li ◽  
Ju Lin Wang
Keyword(s):  
Numerical Simulation ◽  
Present Method ◽  
Taylor Expansion ◽  
Damage Identification ◽  
Linear Equations ◽  
Damage Location ◽  
Identification Method ◽  
Before And After ◽  
Shear Buildings ◽  
High Measure

Based on the easy testability and high measure precision of structural frequency, a damage identification method for shear buildings is presented. With frequency being regarded as the function of damage parameters, the linear equations with damage parameters as unknowns can be constructed via Taylor expansion. The equations are solved to locate the whole damage location and quantify the severity of the damage. Furthermore, the iteration-self modification is proposed to improve the accuracy of damage identification greatly. The data used in the method include frequency before and after damage. A numerical simulation example using a three-storey sheer structure is given to validate the present method.

Damage Identification of Benchmark Structure Using ANN

2012 ◽  
Vol 152-154 ◽  
pp. 796-801 ◽  
Author(s):  
Xiao Ming Yang ◽  
Ya Mei Mi
Keyword(s):  
Neural Network ◽  
Numerical Simulation ◽  
Artificial Neural Network ◽  
Health Monitoring ◽  
Damage Identification ◽  
Task Group ◽  
Structure Health Monitoring ◽  
Second Stage ◽  
Damage Location ◽  
Two Stages

This paper presents an application of artificial neural network for damage identification of benchmark structure that is developed by the ASCE Task Group on Structure Health Monitoring. Many SHM studies apply their methods to the benchmark structure and test their methods. The benchmark structure is divided to three substructures such as brace, column and beam, so the first stage of damage identification is that the damage substructure is identified and the second stage of damage identification is that damage location in substructure is identified. When the damage identification is numerical simulated, the single damage and multi-damage are considered. The method of two stages is applied in the two conditions and ANN is used in every stage. From the result of numerical simulation, ANN can correctly identify the damage substructure and damage location in brace substructure and column substructure.

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