Dynamic response of tower crane induced by the pendulum motion of the payload

Abstract

Dynamic response of tower cranes coupled with the pendulum motions of the payload is studied in this paper. A simple perturbation scheme and the assumption of small pendulum angle are applied to simplify the governing equation. The tower crane is modeled by the finite element method, while the pendulum motion is represented as rigid-body kinetics. Integrated governing equations for the coupled dynamics problem are derived based on LagrangeÕs equations including the dissipation function. Dynamics of a real luffing crane model with the spherical and planar pendulum motions is analyzed using the proposed formulations and computational method. It is found that the dynamic responses of the tower crane are dominated by both the first few natural frequencies of crane structure and the pendulum motion of the payload. The dynamic amplification factors generally increase with the increase of the initial pendulum angle and the changes are just slightly nonlinear for the planar pendulum motion.

Calculation method and control value of static stiffness of tower crane

“…Future work is necessary to study the dynamic response of tower cranes induced by different kinds of payloads, such as the job of Ju [13] and Chin [14].…”

Sources of structural failure in ship unloaders

“…Examples of rigid kinetic models can be found in Ghigliazza and Holmes (2002), Ju and Choo (2005) and Ju et al (2006). Combining this type of model with the loads models, it is possible to derive any variation of displacement, speed, acceleration and inner forces.…”

Elimination Contortion or Miss Shaping Effect in Vertical Pole (Mast) of 50t Level Lufing Crane.

“…As it is a main support on which crane rotates and carry load can cause damage in machinery and girder. It makes material uncap able to withstand [3]. 393 longitudinal, transverse, angular twisting, buckling and bowing.…”