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2 Archives of Civil and Mechanical Engineering

2 2015

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The influence of constructive parameters on response of bucket wheel excavator superstructure in the out-of-resonance region

Bošnjak S. M., Oguamanam D. C. D., Zrnić N. D.

Archives of Civil and Mechanical Engineering

2015

Vol. 15, no. 4

977--985

The influence of constructive parameters on response of bucket wheel excavator superstructure is investigated by using a four degrees-of-freedom discrete dynamic model. Four representative geometric configurations of the superstructure are examined. The maximum displacements and accelerations are observed when the bucket wheel boom is in its lowest position. Further analysis on this configuration is performed to determine the effects of the structural elements stiffness and the bucket wheel weight on the system response. A set of the magnitudes of the parameters that may cause resonance are also determined.

Dynamic responses of a gantry crane system due to a moving body considered as moving oscillator

Zrnić N. D., Gašić V. M., Bošnjak S. M.

Archives of Civil and Mechanical Engineering

2015

Vol. 15, no. 1

243--250

This paper discusses a combined finite element and analytical method for obtaining transverse and longitudinal vibrations of a gantry crane system subjected to an elastically suspended moving body. The two-dimensional inertial effects of the moving body are included in derivation of differential equation of motion for the system. Factors as speed, acceleration and suspension characteristics of a moving body are studied, including the influence of structural damping. The obtained results validate the presented approach and can be used in the design process of gantry cranes.