Dynamic responses of hydraulic mobile crane with consideration of the drive system

The dynamic behaviour of mobile cranes is determined not only by the steel structures and the external loads but also by the drive- and control systems. In today’s dynamic calculation of mobile cranes, the drive systems are modelled through the method of “kinematic forcing” or by measurements for outputs of the drive system. To improve this situation, a new method for dynamic calculation of mobile cranes has been developed. In this method, the flexible multibody model of the structure will be coupled with the model of the drive system. In that way the elastic deformation, the rigid body motion of structures and the dynamic behaviour of the drive system can be determined in an integrated model. The calculation method has been realized for a hydraulic mobile crane. In addition to the structural elements, the mathematical modelling for hydraulic drive- and control system is described. The crane rotating simulation for arbitrary working conditions has been carried out. As a result, a more exact representation of dynamic behaviour, not only for the crane structure, but also for the drive system is achieved.