A Unified Mechanics Modeling For Airport Special Equipment SLE

Scissor lifting mechanism(SLM) has been widely used in the production practice, such as in the fields of machinery construction and aeronautics. Many airport ground support equipments(GSE) are mounted with SLM as well.As a single degree of freedom mechanism, SLM has many different input configurations. A unified modeling process of input length vector and input force vector is firstly proposed. With which, input vectors under any configuration can be similarly calculated by introducing a characteristic triangle and defining corresponding parameters. Inverse kinematics of unified input vectors is built. Furthermore, mathematic analysis of unified model is studied in this paper. Results reveal that in most of configurations input length and input force are consistently and reversely monotonic except two configurations under particular parameter settings. Dead point position and input extremum position are proved to be coincident and only exist in above mentioned two special configurations. Proposed unified model and its mathematic properties are verified with four reported applications. Then build the unified expression of the internal force through internal nodes. On the basis of the internal force expression, internal force field function is established. Finally, dynamics simulation validation is conducted by SOLIDWORKS MOTION.To SLM research, the presented method can provide standard mechanical variables for analysis of internal forces and stresses, movement performance evaluation and optimal design of mechanism. Results of mathematic analysis indicate how to decide power of driver in design and compare different input configurations.