Application of thermographic fields in identification of structural properties and defects

• Autorzy: Dems K. , Mróz Z.
• Języki publikacji: EN

Abstrakty

EN

The detection of defects as well as their location, orientation and size is performed using measurements of surface temperature either at some selected points or on selected surface areas or lines. The response temperature of a structure is caused by statically, quasi-statically or dynamically applied thermal load on some structural boundary parts or within its domain. On the basis of results of measurements, an inverse heat transfer problem is formulated for a model structure and next solved. The inverse solution is constructed by minimizing the properly defined distance norm of measured and model temperatures. The model temperature distribution is calculated using the finite element model of a structure, while in minimizing the distance norm functional the gradient-oriented methods are used. The proper sensitivities of introduced identification functional are also derived. Some simple examples illustrate the applicability of the proposed approach. Keywords: identification, sensitivity, thermographic methods, path-independent integrals

Słowa kluczowe

EN

identification; sensitivity; thermographic methods; path-independent integrals

PL

identyfikacja; termografia

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Computer Assisted Mechanics and Engineering Sciences
• Rocznik: 2006
• Tom: Vol. 13, No. 1
• Strony: 3--19
• Opis fizyczny: Bibliogr. 6 poz., tab., wykr.

Twórcy

autor

Dems K.

autor

Mróz Z.

• Department of Technical Mechanics, Technical University of Łódź, Żeromskiego 116, Łódź, Poland

Bibliografia

• [1] K. Dems and Z. Mróz. Shape sensitivity in mixed Dirichlet-Neumann boundary-value problems and associated class of path-independent integrals,. Eur. J. Mech. A/Solids, 14(2): 169-203, 1995.
• [2] K. Dems, R. Korycki and B. Rousselet. Application of first- and second-order sensitivities in domain optimization for steady conduction problem. J. Thermal Stresses, 20: 697-728, 1997.
• [3] K. Dems and Z. Mróz. Sensitivity analysis and optimal design of external boundaries and interfaces for heat conduction systems. J. Thermal Stresses, 21: 461-488, 1998.
• [4] K. Dems and B. Rousselet. Sensitivity analysis for transient heat conduction in a solid body. Struct. Opt., 17: 36-45 (part I), 46-54 (part II), 1999.
• [5] J K. Dems, Z. Mróz. Sensitivity analysis and path-independent integrals in heat transfer problems. In: Rozprawy z mechaniki konstrukcji i materiałów, pp. 51-64, Wyd. Politechniki Krakowskiej, Seria: Inżynieria Lądowa, Monografia 302, Cracow 2004.
• [6] S.W. Doebling, CR. Farrar, M.B. Prime and D.W. Sheritz. Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: a literature review. Los Alamos Natl. Lab. Rep. LA-13070-MS, 1996