scholarly journals Modal parameter-based Damage Identification in Cylindrical Pipe using Dynamic Response

2017 ◽  
Vol 199 ◽  
pp. 1988-1993
Author(s):  
Kumar Gaurav ◽  
Kumari Sonam ◽  
Vaibhav Singhal ◽  
Koushik Roy
Keyword(s):  
Dynamic Response ◽  
Damage Identification ◽  
Modal Parameter ◽  
Cylindrical Pipe

Study on Damage Performance of Oil Storage Tank in the Basis of Modal Test and FEA

2010 ◽  
Vol 163-167 ◽  
pp. 2507-2510
Author(s):  
Guo Feng Du ◽  
Cheng Xiang Xu ◽  
Shan Po Jia
Keyword(s):  
Storage Tank ◽  
Damage Identification ◽  
Single Point ◽  
Physical Parameters ◽  
Modal Parameter ◽  
Tank Model ◽  
Modal Test ◽  
Oil Storage ◽  
Oil Storage Tank ◽  
Foundation Parameters

In order to learn about the dynamic characteristics of the oil storage tank, detect and identify the damaged oil storage tank, based on the basic principle of the experimental modal analysis, the modal test was maken on the vertical dome roof steel oil storage tank model with the hammer method of multi-point input and output on single point, and the identification ability of the modal parameter was studied when the oil storage tank model is damaged. At the same time, we carried out the model's simulation calculation with FEA, considering the effects of the structural physical parameters and the foundation parameters of the oil storage tank. The calculated results of modal test are in accordance with test values, the analysis results provides certain basis for the damage identification and health monitoring work of the oil storage tank structure.

scholarly journals The role of dynamic response parameters in damage prediction

2019 ◽  
Vol 233 (13) ◽  
pp. 4620-4636 ◽  
Author(s):  
Behzad Ahmed Zai ◽  
MA Khan ◽  
Kamran A Khan ◽  
Asif Mansoor ◽  
Aqueel Shah ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Dynamic Response ◽  
Health Monitoring ◽  
Structural Damage ◽  
Mode Shapes ◽  
Future Research ◽  
Modal Parameter ◽  
Structural Health ◽  
Structural Applications

This article presents a literature review of published methods for damage identification and prediction in mechanical structures. It discusses ways which can identify and predict structural damage from dynamic response parameters such as natural frequencies, mode shapes, and vibration amplitudes. There are many structural applications in which dynamic loads are coupled with thermal loads. Hence, a review on those methods, which have discussed structural damage under coupled loads, is also presented. Structural health monitoring with other techniques such as elastic wave propagation, wavelet transform, modal parameter, and artificial intelligence are also discussed. The published research is critically analyzed and the role of dynamic response parameters in structural health monitoring is discussed. The conclusion highlights the research gaps and future research direction.

An automated damage identification technique based on vibration and wave propagation data

2006 ◽  
Vol 365 (1851) ◽  
pp. 479-491 ◽  
Author(s):  
Ajit Mal ◽  
Sauvik Banerjee ◽  
Fabrizio Ricci
Keyword(s):  
Wave Propagation ◽  
Dynamic Response ◽  
Structural Damage ◽  
Damage Identification ◽  
Damage Index ◽  
Composite Plates ◽  
Ambient Conditions ◽  
Current State ◽  
Potential Applications ◽  
Identification Technique

This paper is concerned with the detection and characterization of hidden defects in advanced structures before they grow to a critical size. A novel method is developed using a combination of vibration and wave propagation data to determine the location and degree of damage in structural components requiring minimal operator intervention. The structural component is to be instrumented with an array of actuators and sensors to excite and record its dynamic response. A damage index, calculated from the measured dynamic response of the structure in a reference state (baseline) and the current state, is introduced as a determinant of structural damage. The index is a relative measure comparing the two states of the structure under the same ambient conditions. The indices are used to identify damages in the forms of delaminations and holes in composite plates for different arrangements of the source and the receivers. The potential applications of the approach in developing health monitoring systems in defects-critical structures are discussed.

INFLUENCE OF OBJECTIVE FUNCTIONS IN STRUCTURAL DAMAGE IDENTIFICATION USING REFINED AND SIMPLE MODELS

2009 ◽  
Vol 09 (04) ◽  
pp. 607-625 ◽  
Author(s):  
RICARDO PERERA ◽  
SHENG-EN FANG
Keyword(s):  
Dynamic Response ◽  
Objective Function ◽  
Structural Damage ◽  
Damage Identification ◽  
Computational Cost ◽  
Computational Time ◽  
Fe Model ◽  
Beam Model ◽  
Objective Functions ◽  
Multi Objective

The most usual approach for solving damage identification problems is the use of the finite element (FE) model updating method. To apply the method, a minimization of an objective function measuring the fit between measured and model predicted data is performed. Then, the success of the procedure depends strongly on the accuracy of the FE model and the choice of a suitable objective function. Although detailed FE models provide an accurate means for calculating the dynamic response of the structure, their size and complexity involve a large number of parameters to be updated and a high computational cost. In order to shorten the computational time, more simplified and practical models able to model the global dynamic response of the structure accurately would be desirable. Furthermore, working with several objective functions instead of only one would increase the robustness and performance of the procedure. In this paper, a multi-objective simple beam model is proposed and compared with a more refined model based on plane elements. Furthermore, in the multi-objective framework, different combinations of objective functions are studied. The reliability and effectiveness of the proposed model has been evaluated in a damage detection problem of a reinforced concrete frame experimentally tested under different levels of damage.

Modeling and Material Damage Identification of a Sandwich Plate Using MDOF Modal Parameter Estimation and the Method of Virtual Forces

2005 ◽  
Author(s):  
Jonathan R. White ◽  
Douglas E. Adams ◽  
Kumar Jata
Keyword(s):  
Parameter Estimation ◽  
Frequency Response ◽  
Sandwich Panel ◽  
Damage Identification ◽  
Thermal Protection ◽  
Estimation Algorithm ◽  
Impact Testing ◽  
Modal Parameter ◽  
Virtual Forces ◽  
Modal Parameter Estimation

High temperature and low density metallic materials are being considered for thermal protection systems (TPS) for future aerospace applications. In this paper, a method for damage detection, location, and quantification using one actuator with distributed vibration sensors is presented for estimating virtual forces introduced by damage in a model aluminum honeycomb (H/C) TPS panel. A simplified analytical transverse vibration model of a homogeneous flat plate is considered to verify the method, which is then applied to the model aluminum H/C sandwich panel to demonstrate the method experimentally. First, a fully populated frequency response function matrix from the healthy panel is measured using an equal number of actuators and sensors. Virtual forces due to damage are then estimated by filtering data from the damaged panel using the healthy baseline response matrix. Second, a modal dynamic model for the sandwich panel is extracted using a single degree-of-freedom modal parameter estimation algorithm (Global Least Squares). The estimated modal frequencies and residues are used to build a dynamic observer to synthesize frequency response measurements unavailable with only one actuator. Modal impact testing is used to acquire frequency response functions, which serve as inputs to the frequency and residue parameter estimation process. It is shown that the virtual force method, with or without a modal observer, can detect damage due to density changes.

Wavelet Analysis in Damage Detection for Bridge Structure

2009 ◽  
Vol 417-418 ◽  
pp. 813-816
Author(s):  
Wei Bing Hu ◽  
Wei Hu ◽  
Yu Zheng
Keyword(s):  
Energy Spectrum ◽  
Wavelet Analysis ◽  
Dynamic Response ◽  
Damage Detection ◽  
Structural Damage ◽  
Bridge Structure ◽  
Response Signal ◽  
Modal Parameter ◽  
Structural Dynamic ◽  
Signal Energy

The damage of structure leads to variation of structural modal parameter，so the wavelet transform for damage detection is introduced in this paper for considering the variation. First, structural dynamic response signal on the basis of the vibration-based structural damage diagnosis methods is calculated by structural analysis in the paper, then, each of sub-signals is calculated according to wavelet analysis, also, the sub-signal energy spectrum of dynamic response signal and energy spectrum variation are known. By observing the difference of the sub-signal and the variation of the sub-signal energy spectrum, we can get the variation of structural modal parameter and the sub-signal energy spectrum due to the performance degradation of the whole structure and local variations of damage level and location ,so that this method can be used in on-line damage detection for bridge structure.

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