Experimental studies of shell vibrations

Abstract

Results of modal analysis by ANSYS software for high pressure shaft of turbofan engine NK-8 are presented. Results of experimental researches of low modes and frequencies of the shell by photogrammetric complex ARAMIS HS are given as verification of calculations. The main attention is for experiment fulfillmentfeatures. For example, conditions of shell installation for free position of shaft are developed; different ways of researched shell vibration excitement are used. It gives a possibility of correct experiment for own frequencies obtaining. Comparison experiments for different values of crop-factor are fulfilled; analysis of information volume for obtained pictures is undertaken. Technology of researched object lighting for satisfactory image recognition for little exposure is developed. Methods of researched object photographing for complex algorithm of pictures switching are developed. It gives a possibility of experimental research of vibration processes which frequency is more than limit frequency of recording equipment. By these results an experimental methodic is developed and an experiment is fulfilled. First and second own frequencies are obtained experimentally; its values correspond to calculation results. In means that modeling of shaft in ANSYS software and boundary conditions are correct. Vibration modes for frequencies 211 Hz and 362 Hz are obtained. It corresponds to calculation results too. This research is fulfilled as a part of research of high pressure shaft of turbofan engine NK-8, as obtaining of correct model of boundary conditions (stiffness and damping of flange connection between shaft and disks of turbine and compressor) and influence of these boundary conditions on own frequencies and modes.

About the authors

D. S. Lezhin

Samara State Aerospace University

Author for correspondence.
Email: ldms@mail.ru

Candidate of Science (Engineering)

Associate Professor

Russian Federation

O. V. Nagurnaya

Samara State Aerospace University

Email: ulch_@mail.ru

Lead Programmer

Russian Federation

E. V. Nikulin

Samara State Aerospace University

Email: nikulinevgen@rambler.ru

Engineer

Russian Federation

D. Vergnano

Technical University of Torino, Torino

Email: vdk.88@mail.ru

Aerospace engineering master student

Italy

References

  1. Lezhin D.S., Parovay F.V., Sobul A.V. Application of contactless measuring complex «ARAMIS» in experimental tasks // Vestnik of the Samara State Aerospace University. 2011. No. 3(27), part 4. P. 244-253 (In Russ.)
  2. Ulanov A.M., Lezhin D.S., Shvecov A.V. Experimental research of vibrations of pipeline of GTD with support from MR for working off method of calculation in environment of ANSYS // Vestnik of the Samara State Aerospace University. 2012. No. 3(34), part 3. P. 245-250 (In Russ.)
  3. Schmidt T., Tyson J., Galanulis К. Full-Field Dynamic Displacement and Strain Measurement Using Advanced 3D Image Correlation Photogrammetry: Part I // Experimental Techniques. 2003. V. 27, no. 3. P. 47-50. doi: 10.1111/j.1747-1567.2003.tb00115.x
  4. Schmidt T., Tyson J., Galanulis К. Full-Field Dynamic Displacement and Strain Measurement Using Advanced 3D Image Correlation Photogrammetry: Part II // Experimental Techniques. 2003. V. 27, no. 4. P. 22-26. doi: 10.1111/j.1747-1567.2003.tb00118.x
  5. Schmidt T., Tyson J., Galanulis K., Revilock D., Melis M., "Full-field dynamic deformation and strain measurements using high-speed digital cameras". 26th International Congress on High-Speed Photography and Photonics, SPIE Vol, 5580. P. 174-185. (2005) doi: 10.1117/12.567142
  6. Eriksen R., Berggreen C., Boyd S.W., Dulieu-Barton J.M. Towards high velocity deformation characterisation of metals and composites using Digital Image Correlation // EPJ Web of Conferences. 2010. V. 6. Article number 31013. doi: 10.1051/epjconf/20100631013
  7. Yu JH, Dehmer PG. Dynamic Impact Deformation Analysis Using High-speed Cameras and ARAMIS Photogrammetry Software. Aberdeen Proving Ground, MD: Army Research Laboratory; 2010. doi: 10.21236/ada537764

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