Mechanical Analysis And Simulation Research Of Lifting Mechanism For Schnable Car

Schnabel car is a kind of railway special freight wagon use for the transportation of overload and overgauge goods, and it has large size and complex structure. As the main component to hold goods, lifting mechanism is crucial to the safety and stability. The huge components of lifting mechanism has different stiffness and the cargo’s unbalance loading will make force of lifting unbalance, and it may cause a major security accident because of the load of a Schnabel beam beyond its limit. Based on the detailed research of the existing technical documentation of Schnabel car, The kinematics, stiffness, load calculation of clamp and load sharing of lifting mechanism were deeply analyzed. The main research contents are as follows:Firstly, Take the current D38 Schnabel Car as a representative, the kinematics of the lifting mechanism was analyized in detail, concluding freedom calculation, location calculation and lift track of the cargo, the mapping relationship of velocit and force were obtained, and kinematics simulation was done by RecurDyn.Then, the beam element is established based on Timoshenko theory, and the element stiffness matrix was calculated, the stiffness matrix of Schnabel beam was assembled, then the deformation calculation and deformation simulation was compared to verify the accuracy of stiffness model.And then, the static calculation was done by simultaneous equations of elastic deformation coordination equation and static force balance equation, and the mapping relationships of the bearing capacity and stiffness of the mechanism were obtained. On this basis, the unbalanced load coefficient of the lifting mechanism was defined referring to the concept of mean square deviation, based on space mapping theory, non dimensional treatment of stiffness was produced and the influence on load sharing characteristics of stiffness deviation and load bias was analyzed, then the stiffness matching method is presented to improve the average load of the lifting mechanism.Finally, The rigid-flexible coupled simulation model of double parallel over constrained lifting mechanism was built in RecurDyn and simulation results verified the correctness of theoretical analysis.