Prototype of the vision system for deflection measurements

• Autorzy: Kohut P. , Holak K. , Uhl T.

Warianty tytułu

PL

Prototyp systemu wizyjnego do pomiarów ugięć

• Języki publikacji: EN

Abstrakty

EN

The vision-based method of civil engineering construction's in-plane deflection measurements was developed. Displacement field of the analyzed structure resulting from load was computed by means of digital image correlation coefficient. The application of homography mapping enabled the deflection curve to be computed from two images of the construction acquired from two distinct points in space. The shape filter and rectangular marker detector were implemented to provide higher level of automation of the method. There are discussed developed methodology, created architecture of software tool as well as experimental results obtained from tests made on lab set-ups.

PL

W pracy przedstawiono opracowany prototyp systemu wizyjnego do pomiarów dwuwymiarowych deformacji konstrukcji. Pole przemieszczeń analizowanego obiektu, powstałe pod wpływem działających obciążeń, wyznaczono przy pomocy znormalizowanego współczynnika korelacji. Zastosowanie przekształcenia homograficznego umożliwiło wykonanie pomiarów ugięcia konstrukcji na podstawie jej dwóch obrazów zarejestrowanych z dwóch różnych punktów przestrzeni. Zaimplementowany filtr kształtów oraz detektor znaczników referencyjnych umożliwił zwiększenie automatyzacji procesu pomiarowego. W artykule przedstawiono opracowaną metodykę, architekturę stworzonego oprogramowania oraz wyniki testów eksperymentalnych systemu na stanowisku laboratoryjnym.

Słowa kluczowe

EN

digital image correlation; image registration; vision systems; deflection measurement

PL

korelacja obrazów; nakładanie obrazów; system wizyjny; pomiar ugięcia

• Wydawca: Polskie Towarzystwo Diagnostyki Technicznej
• Czasopismo: Diagnostyka
• Rocznik: 2011
• Tom: nr 4(60)
• Strony: 3--11
• Opis fizyczny: Bibliogr. 33 poz., rys., tab., wykr.

Twórcy

autor

Kohut P.

autor

Holak K.

autor

Uhl T.

• AGH University of Science and Technology, Department of Robotics and Mechatronics, Al. A. Mickiewicza 30, 30-059 Krakow, tel. [phone],

Bibliografia

• [1] Kohut P., Holak K., Uhl T.: Application of image correlation for SHM of steel structures, Structural Health Monitoring 2008: proceedings of the fourth European workshop, Cracow, Poland, , July 2-4 2008, pp. 1257-1264.
• [2] Uhl T.: SHM of civil structures - methods, tools and applications, Proceedings of the international conference on Experimental Vibration Analysis for Civil Engineering Structures EVACES’09, Dolnośląskie Wydawnictwo Edukacyjne, Wrocław 2009.
• [3] Uhl T., Kohut P., Holak K.: Construction deflection examination by means of correlation coefficient, Proceedings of the 13th School of Modal Analysis,Cracow, Poland 2009.
• [4] Uhl T., Kohut.P, Szwedo M., Holak K.: Static and dynamic optical measurement in SHM of civil structures, Proceeding of the 7th international workshop on Structural Health Monitoring, DESTech publications, Lancaster 2009.
• [5] Kohut P., Kurowski P.: The integration of vision based measurement system and modal analysis for detection and localization of damage, Engineering achievements across the global village, The International Journal of INGENIUM, Cracow , 2005, pp.391-398.
• [6] Kohut P., Kurowski P.: The integration of vision system and modal analysis for SHM applications, Proc. Of the IMAC-XXIV a conference and exposition on structural dynamics, January 30-February 02 St. Louis, 2006, pp. 1-8.
• [7] Lee, M., Precht, M., Tyson, J., Schmidt, T.: Application of 3D Measurement System with CCD Camera in Microelectronics, Advanced Packaging, November 2003.
• [8] Schmidt, T., Tyson, J., Galanulis, K.: Full-Field Dynamic Displacement and Strain Measurement Using Advanced 3D Image Correlation Photogrammetry, Experimental Techniques, Vol.27, No.3, pp.41-44, May/June 2003.
• [9] Johnson, E., Woodard, N.: Low-Cost Electrical Resistance Spot Welding Technique for Micro-Optical Component Mounting with Sub-Micron Tolerance, Proceedings of Photonics Packaging Symposium, San Francisco, CA, Aug. 2003.
• [10] Schmidt, T., Tyson, J., Galanulis, K.: Dynamic Strain Measurement Using Advanced 3D Photogrammetry, Proceedings of IMAC XXI, Orlando, FL, Feb. 2003.
• [11] Tyson, J., Schmidt, T., Shahinpoor, M., Galanulis, K.: Biomechanics Deformation and Strain Measurements with 3D Image Correlation, Experimental Techniques, Vol.26, No.5, pp.39-42, Sept./Oct. 2002.
• [12] Tyson, J., Schmidt, T., Galanulis, K.: Advanced Photogrammetry for Robust Deformation and Strain Measurement, Proceedings of SEM. 2002 Annual Conference, Milwaukee, WI, June 2002.
• [13] Hotz, W., Hänggi, P., Determination of Forming Limit Curves, 2001. Bergmann, D., Ritter, R., 3D Deformation Measurement in small Areas based on Grating Method and Photogrammetry, 1998.
• [14] Alpers, B., Bergmann, D., Galanulis, K., Winter, D.: Advanced Deformation Measurement in Sheet Metal Forming, 1999.
• [15] Steinchen, W. & Yang, L.: Digital Shearography, Theory and Application of Digital Speckle Pattern Shearing Interferometry, SPIE Press, 2003.
• [16] Schmidt, T., Tyson, J.: Pulsed Laser Systems for Wide Field Vibration Analysis, ASNT Fall Conference, Oct. 2000.
• [17] Tyson, J.: Non-Contact Full-field Strain Measurement with 3D ESPI, Sensors, Vol. 17 No. 5, pp. 62 - 70, May 2000.
• [18] Tyson, J.: Dynamic Deformation Analysis with Pulsed ESPI, Society of Experimental Mechanics Conference, June 1999.
• [19] Tyson, J.: Full-field Vibration and Strain Measurement with 3D ESPI, Sensors, Vol 16 No. 6, pp. 16 - 22, June 1999.
• [20] Tyson, J.: Advanced Brake Squeal Analysis and Vibration Measurement, 4th International Brake Colloquium, Gramado, Brazil, April 15, 1999.
• [21]Tyson, John: Portable Interferometry Systems for Rapid NDI, USAF Aircraft Structural Integrity Conference, Dec. 1998.
• [22] Tyson, John: Practical Composite Repair Evaluation, Proceedings of 41st Int’l SAMPE Symposium, Vol. 41, Book 1, pp. 609-614, March 1996.
• [23] Tyson, John: Shearography NDE of Rocket Motor Components, Joint Army-Navy-NASAAir Force Nondestructive Evaluation Subcommittee Meeting, July 14-16, 1992.
• [24] Chu T. C., Ranson W. F., Sutton M. A., Peters W. H.: Application of digital-image correlation techniques to experimental mechanics. Exp Mech. 25, September 1985, pp.232-24.
• [25] Hartley R., Zisserman A.: Multiple View Geometry in Computer Vision, Cambridge University Press, 2004.
• [26] Ma Y., Soatto S., Kosetska J., Sastry S.: An Invitation to 3D Computer Vision, Springer-Verlag, New York 2004.
• [27] Gonzales R., Woods R.: Digital Image Processing, Prentice Hall 2002.
• [28] Russ J.: Image Processing Handbook, CRC Press 1998.
• [29] Shapiro L., Computer Vision, Prentice Hall, 2000.
• [30] Zitova B., Flusser J.: Image registration methods: A survey, Image and Vision Computing 21, Elsevier, 2003.
• [31] Holak K, Kohut P., Cieślik J.: Application of three-dimensional vision techniques in mechanical vibrations measurement (in polish), Proceedings of the 8th Workshop of Mechatronics Design, 2008, pp. 63-70.
• [32] Uhl T., Kohut P., Holak K.: Image correlation techniques in structures deflection measurement, Proceedings of the international conference on Experimental Vibration Analysis for Civil Engineering Structures EVACES’09, Dolnośląskie Wydawnictwo Edukacyjne, Wrocław 2009.
• [33] Bradsky G., Kaebler A.: Learning OpenCV, O’Reilly 2008.