Abstract
Systematic monitoring of torsion (swivelling) of guyed mast shafts has been performed in ITAM since 2005. The occurrence of this phenomenon is conditioned by the fact that the guy ropes are attached to the surface of the shaft, i.e. out of its axis.
The presented two examples of experimental verification describe the analysis of dynamic response of the shaft of real masts and on an aerodynamic model.
The simple calculation model serves for making the proof of the occurrence of the moment, affecting the shaft, which is guyed by three ropes. The exact theoretical solution of the real phenomenon assumes the introduction of dynamics of guy ropes, which vibrate in 3D shapes during the shaft’s movement along the orbit and it´s torsion (swivelling).
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Notes
- 1.
The orbit may degenerate into a line, it may also be circular.
- 2.
These conditions include the fact that the point of intersection of guy ropes; forces may lie “behind” the centre of gravity of the shaft cross section; “behind” means out of the orbit.
- 3.
Could be expressed in the angle.
- 4.
The deviations from ideal elliptical orbits and the courses of swivelling are causes for example by imperfect smoothness of the air flow.
References
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Acknowledgements
The support of the grants GA CR 103/09/0094, MPO TIP FR-TI3/654 and GA CR P105/10/2159 are gratefully acknowledged. Identification code of research project of the ITAM AS CR v.v.i. RVO: 68378297.
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© 2013 The Society for Experimental Mechanics, Inc.
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Urushadze, S., Pirner, M. (2013). Monitoring of Torsion of Guyed Mast Shafts. In: Allemang, R., De Clerck, J., Niezrecki, C., Wicks, A. (eds) Special Topics in Structural Dynamics, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6546-1_67
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DOI: https://doi.org/10.1007/978-1-4614-6546-1_67
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