Optimization of crane mechanisms to reduce vibration: Fid-Bau Portal

Optimization of crane mechanisms to reduce vibration

Chwastek, Stefan

Abstract Material handling operations give rise to Euler and Coriolis forces whose impacts should be minimized already at the stage of selection of the system parameters and mechanism structure. Effective optimization, confirmed by dynamic analysis, allows the dynamic overload values to be significantly reduced at the stage of design of the steel structure, resulting in a lighter and cheaper structure. Basing on the mathematical model the optimization criteria were formulated in the form of quadratic functionals for each crane mechanism. Solving the functionals to find the minimum values yields a set of optimal parameters of mechanisms such that their interactions should be optimal. The innovative feature of the presented solution is a comprehensive approach to optimization of multi-drive systems, targeting the vibration reduction of the load suspended on the hook and minimizing forces acting in the ropes. Optimization tasks should be executed independently, in the specified order resulting from feedback interactions between respective mechanisms. This approach paired with the method of selective analysis of mechanisms structures will be further developed into the method of synthesizing globally optimal configurations of interacting mechanisms.

Highlights • The impacts of Euler's and Coriolis's forces on crane dynamics should be minimized by selecting the mechanisms parameters. • Rope blocks positions in the compensation system determine the amplitudes of the hook trajectory during luffing. • Force acting in the winch rope and the power demand depend on the parameters of all interacting mechanisms. • Optimization criteria can be combined, but only in relation to one specific mechanism.