Dynamics Simulation Research On All-terrain Crane Based On Dynamics Of Multi-body Systems

All-terrain crane is a mechanical system with very complex structure and high design requirement. All-terrain crane works in hard environment which needs many factors considered. For example, overturned stability of the whole machine, suddenly unload impact, side inertial impact caused by start-up or braking, etc.There are many factors affecting the dynamic characters, which make the calculation very hard when the dynamic analysis of the crane is carried out. At home and abroad, the coefficient of dynamic load is used to make the influence of the dynamic characters included in the crane structure design in order to simplify the calculation.Although the application of the dynamic load coefficient simplifies the dynamic problem, the dynamic characters of the crane cannot be reflected accurately. As a result, there are some errors in the analysis result. So when researching on the all-terrain crane, the dynamic calculation should be carried out to analyze the influence of each dynamic load factor, which can supply much help for the crane design.In this paper, in view of the present status that the dynamic calculation of the all-terrain crane is complex, the dynamic equation of the all-terrain crane is formulated considering the theory of multi-body systems. Then software is programmed to carry out numerical solution according to the formulation. A simulation of the all-terrain crane in ADAMS is carried out to verify the formulation's rationality. Finally, the factors that affect the rotatable characters of all-terrain crane platform is studied by use of the software. The rule how each factor changes and how the ramp acceleration time changes over radius, is summarized. The shortest ramp time is specified by calculation. Those can help to improve handle control precision and reduce structural vibration.