Dynamic simulation of shaking impact of pulley-rope system in crane
Pulley-rope system in cranes is prone to problems of shaking,tilting and so on during operation to seriously reduce work efficiency and increase safety hazards.When dealing with the problem of real-time changes of contact state between pulleys and ropes,adopting the assumption of binding element nodes to material points makes element shape function unable to accurately describe various segments of circular arc curves,reducing element size is needed and solving efficiency is lowered.Here,Introducing the spatial description method,boundary points of contact area on pulley were used to divide different contact states of ropes.Discrete angle degree's circular arc interpolation and Hermite interpolation were used to describe shapes of ropes in contact segments and ropes between pulleys,respectively,and solve each node's material velocity and acceleration.Considering rope axial deformation,the dynamic equation of pulley-rope system was established according to the principle of virtual power.The effectiveness of the proposed method was verified by comparing its results with those of the dynamic simulation software ADAMS.Commonly used pulley-rope systems in lifting equipment were modeled,and effects of different winding modes,lifting weights,and pulley spacings on shaking and impact degree of pulley frame base were studied.It was shown that the proposed dynamic modeling method of pulley-rope systems can provide necessary theoretical supports for engineering practice.
pulley-rope systemshaking impactmulti-flexible body system dynamicsspatial description