109. Strain modal analysis and fatigue residual life prediction of vibrating screen beam

Zerong Zhang

College of Electromechanical Engineering, Qingdao University of Science and Technology,
Qingdao, China

E-mail: cba1998@126.com

Received 17 December 2016; accepted 20 December 2016

DOI https://doi.org/10.21595/jme.2016.18113

Abstract. The displacement and strain modal analysis of vibrating screen beam is carried out, the results show that the relative deviation of the modal frequencies between intact and damaged beam is small, the displacement mode shapes of the damaged beam have no obvious variation, but the strain mode shapes have mutation peaks at the damaged location for the damaged beam. Therefore, a damage index is defined as the rate of strain modal change between damaged and intact beam. The rate of strain modal change increases with the increasing damage extent of the beam. The initial fatigue crack length is related to the damage extent of the beam; the fatigue crack propagation residual life of the beam is predicted by the Paris law. The results show that the rate of strain modal change is a sensitive and reliable damage index for indicating the damage location and damage extent. The predictions of the damage extent and the crack propagation residual life of the vibrating screen beam are beneficial to dynamic optimization design, which can improve the service life of the vibrating screen.

Keywords: vibrating screen, strain modal analysis, multiple damage, crack propagation, residual life.

References

[1]        Cleary P. W., Sinnott M. D., Morrison R. D. Separation performance of double deck banana screens – Part 1: Flow and separation for different accelerations. Minerals Engineering, Vol. 22, 2009, p. 1218‑1229.

[2]        Yantek D. S., Camargo H. R. Structural vibration as a noise source on vibrating screens. ASME International Mechanical Engineering Congress and Exposition, 2009, p. 213‑222.

[3]        Zhao L. L., Liu C. S., Yan J. X. A virtual experiment showing single particle motion on a linearly vibrating screen-deck. Mining Science and Technology, Vol. 20, Issue 2, 2010, p. 276‑280.

[4]        Peng L. P., Liu C. S., Song B. C., et al. Improvement for design of beam structures in large vibrating screen considering bending and random vibration. Journal of Central South University, Vol. 22, Issue 9, 2015, p. 3380‑3388.

[5]        Yam L. H., Leung T. P., Li D. B., et al. Theoretical and experimental study of modal strain analysis. Journal of Sound and Vibration, Vol. 191, Issue 2, 1996, p. 251‑260.

[6]        Adewuyi A. P., Wu Z. S. Modal macro-strain flexibility methods for damage localization in flexural structures using long-gage FBG sensors. Structural Control and Health Monitoring, Vol. 18, Issue 3, 2011, p. 341‑360.

[7]        He L. J., Lian J. J., Ma B. Intelligent damage identification method for large structures based on strain modal parameters. Journal of Vibration and Control, Vol. 20, Issue 12, 2013, p. 1783‑1795.

[8]        Cha Y. J., Buyukozturk O. Structural damage detection using modal strain energy and hybrid multiobjective optimization. Computer-Aided Civil and Infrastructure Engineering, Vol. 30, Issue 5, 2015, p. 347‑358.

[9]        Wang Y. Y., Zhang Z. R. Similar experimental study of test model and prototype of vibrating screen. Journal of Mechanical Engineering, Vol. 47, Issue 5, 2011, p. 101‑105.

[10]     Kranjc T., Slavič J., Boltežar M. A comparison of strain and classic experimental modal analysis. Journal of Vibration and Control, Vol. 22, 2016, p. 371‑381.

[11]     Li D. B., Zhang Y. R., Luo J. Using modal analysis method in analyzing dynamic strain/stress field. Journal of Vibration and Shock, Vol. 4, 1992, p. 15‑22.

[12]     Li Y. Y., Cheng L., Yam L. H., et al. Identification of damage locations for plate-like structures using damage sensitive indices: strain modal approach. Computers and Structures, Vol. 80, Issue 25, 2002, p. 1881‑1894.

[13]     Baragetti S. Innovative structural solution for heavy loaded vibrating screens. Minerals Engineering, Vol. 84, 2015, p. 15‑26.

[14]     Fan J. L., Guo X. L. Numerical simulation on elastic-plastic fatigue crack growth behavior. Journal of Mechanical Engineering, Vol. 51, Issue 10, 2015, p. 33‑40.

[15]     Niu J., Zong Z. H., Chu F. P. Damage identification method of girder bridges based on finite element model updating and modal strain energy. Science China Technological Sciences, Vol. 58, Issue 4, 2015, p. 701‑711.

[16]     Chen L., Cai L. X. Research on fatigue crack growth behavior of materials by considering the fatigue damage near the crack tip. Journal of Mechanical Engineering, Vol. 48, Issue 20, 2012, p. 51‑56.

[17]     Bai X., Xie L. Y. Steady random load method to predict fatigue crack growth life. Acta Aeronautica et Astronautica Sinica, Vol. 35, Issue 9, 2014, p. 2500‑2505.

[18]     Zerbst U., Vormwald M., Pippan R., et al. About the fatigue crack propagation threshold of metals as a design criterion – a review. Engineering Fracture Mechanics, Vol. 153, 2016, p. 190‑243.

Cite this article

Zhang Zerong Strain modal analysis and fatigue residual life prediction of vibrating screen beam. Journal of Measurements in Engineering, Vol. 4, Issue 4, 2016, p. 217‑223.

 

Journal of Measurements in Engineering. December 2016, Volume 4, Issue 4

© JVE International Ltd. ISSN Print 2335-2124, ISSN Online 2424-4635, Kaunas, Lithuania