Structural Engineering and Mechanics

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Accuracy of incidental dynamic analysis of mobile elevating work platforms

  • Jovanovic, Miomir L.J. (University of Nis, Faculty of Mechanical Engineering) ;
  • Radoicic, Goran N. (University "Union - Nikola Tesla" Belgrade, Faculty of Applied Sciences in Nis) ;
  • Stojanovic, Vladimir S. (University of Nis, Faculty of Mechanical Engineering)
  • Received : 2018.08.31
  • Accepted : 2019.04.18
  • Published : 2019.09.10
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Abstract

This paper presents the results of a study into the dynamic behaviour of a support structure of a mobile elevating work platform. The vibrations of the mechanical system of the observed structure are examined analytically, numerically, and experimentally. Within the analytical examination, a simple mathematical model is developed to describe free and forced vibrations. The dynamic analysis of the mechanical system is conducted using a discrete dynamic model with a reduced number of vibrational degrees of freedom. On the basis of the expression for the system energy, and by applying Lagrange's equations of the second kind, differential equations are derived for system vibrations, frequencies are determined, and the laws of forced platform vibration are established. At the same time, a nonlinear FEM model is developed and the laws of free and forced vibration are determined. The experimental and numerical part of the study deal with the examination of the real structure in extreme conditions, taking into account: the lowest eigenfrequency, forced actions that could endanger the general stability, the maximal amplitudes, and the acceleration of the work platform. The obtained analytical and numerical results are compared with the experiments. The experimental verification points to the adverse behaviour of the platform in excitation cases - swaying. In such a situation, even a relatively small physical force can lead to unacceptably high amplitudes of displacement and acceleration - exceeding the usual work values.

Keywords

Acknowledgement

Supported by : University of Nis

References

  1. Arisoy, B. and Erol, O. (2018), "Finite element model calibration of a steel railway bridge via ambient vibration test", Steel Comp. Str., 27(3), 327-335. https://doi.org/10.12989/scs.2018.27.3.327.
  2. Arslan, G., Sevim, B. and Bekiroglu, S. (2017), "Determination of structural performance of 3D steel pipe rack suspended scaffolding systems", Str. Eng. Mech., 64(5), 671-681. https://doi.org/10.12989/sem.2017.64.5.671.
  3. Bosnjak, S., Gnjatovic, N., Momcilovic, D., Milenovic, I. and Gasic, V. (2015), "Failure analysis of the mobile elevating work platform", Case Studies Eng. Failure Analysis, 3, 80-87. https://doi.org/10.1016/j.csefa.2015.03.005.
  4. Bosnjak, S., Zrnic, N. and Dragovic, B. (2009), "Dynamic response of mobile elevating work platform under wind excitation", Strojniski vestnik - J. Mech. Eng., 55(2), 104-113.
  5. Dong, R., Pan, C., Hartsell, J., Welcome, D., Lutz, T., Brumfield, A., Harris, J., Wu, J., Wimer, B., Mucino, V. and Means, K. (2012), "An investigation on the dynamic stability of scissor lift", Open J. Safety Science Tech., 2(1), 8-15. http://dx.doi.org/10.4236/ojsst.2012.21002.
  6. Fujioka, D., Rauch, A. and Singhose, W. (2009), "Tip-over stability analysis of mobile boom cranes with double-pendulum payloads", American Control Conference, St. Louis, USA, June.
  7. HBM (Hottinger Baldwin Messtechnik GmbH) (2012), "HBM Data sheets", Im Tiefen See 45, 64293 Darmstadt, Germany, https://www.hbm.com/en.
  8. Jovanovic, M. (1990), "Optimization of the level-luffing system structure and resistance of the mechanism of portal-rotating cranes", Ph.D. Dissertation, University of Nis, Faculty of Mechanical Engineering, Nis, Serbia.
  9. Jovanovic, M., Milic, P., Janosevic, D. and Petrovic, G. (2010), "Accuracy of FEM analyses in function of finite element type selection", Facta Universitatis - Series Mech. Eng., 8(1), 1-8. https://scindeks.ceon.rs/article.aspx?artid=0354-20251001001J. https://doi.org/10.2298/FUACE1001001M
  10. Leah, C., Riley, D. and Jones, A. (2013), "Mobile Elevated Work Platform (MEWP) incident analysis", Research report RR961; The Health and Safety Laboratory/Health and Safety Executive, Buxton, United Kingdom. http://www.hse.gov.uk/research/rrpdf/rr961.pdf.
  11. Lu, P., Zhao, R. and Zhang, J. (2010), "Experimental and finite element studies of special-shape arch bridge for self-balance", Str. Eng. Mech., 35(1), 37-52. https://doi.org/10.12989/sem.2010.35.1.037.
  12. Radoicic G. (2016), "The dynamical behaviour of certain classes of heavy lifting and construction machinery from the aspect of accidental events", Ph.D. Dissertation, University of Nis, Faculty of Mechanical Engineering, Nis, Serbia.
  13. Radoicic, G. (2006), "The vibro-comfort testing on a mobile elevating work platform", J. Applied Eng. Science, 11(-), 25-34.
  14. Radoicic, G. and Jovanovic, M. (2013), "Experimental identification of overall structural damping of system", Strojniski vestnik - J. Mech. Eng., 59(4), 260-268. https://doi.org/10.5545/sv-jme.2012.569.
  15. Radoicic, G. and Jovanovic, M. (2017), "Transient simulation of impulse wind effect on a tall shipyard frame structure", Int. J. Applied Eng. Science, 15(2), 192-202. https://doi.org/10.5937/jaes15-12935.
  16. Radoicic, G., Jovanovic, M. and Marinkovic, D. (2014), "Nonlinear incidental dynamics of frame structures", Str. Eng. Mech., 52(6), 1193-1208. https://doi.org/10.12989/sem.2014.52.6.1193.
  17. Raskovic, D. (1965), Theory of Oscillations, Scientific Book (Naucna knjiga), Belgrade, Serbia.
  18. Sabuncu, M., Ozturk, H. and Yashar, A. (2016), "Static and dynamic stability of cracked multi-storey steel frames", Str. Eng. Mech., 58(1), 103-119. https://doi.org/10.12989/sem.2016.58.1.103.
  19. Stojanovic, V. and Kozic, P. (2015), Vibrations and Stability of Complex Beam Systems, Springer International Publishing, Switzerland.
  20. Tan, G., Wang, W., Jiao Y. and Wei, Z. (2017), "Free vibration analysis of continuous bridge under the vehicles", Str. Eng. Mech., 61(3), 335-345. https://doi.org/10.12989/sem.2017.61.3.335.
  21. Wu, X. and Li, H. (2017), "Experimental and analytical behaviour of a pre-stressed U-shaped girder bridge", Str. Eng. Mech., 61(3), 427-436. https://doi.org/10.12989/sem.2017.61.3.427.