Dynamic Analysis Of Scissors Aerial Work Platform Driven By Dual Hydraulic Cylinders

As a typical aerial working equipment, scissors aerial work platform has lots of advantages such as compact structure, flexibility, convenient operation, low cost and so on, so it is widely used in airport terminals, constructions maintenance, electrical installation, advertising, decoration and other occasions. Currently, the domestic enterprise mostly adopts the scheme driven by a single hydraulic cylinder, but with the increasing working height and load, some enterprises begin to adopt dual hydraulic cylinders synchronous driving scheme which uses upper and lower hydraulic cylinder arranged in parallel. Introducing dual hydraulic cylinders makes the dynamic characteristics of scissors aerial work platform more complex, the domestic research in this area is still in the exploratory stage.Taking scissors aerial work platform driven by dual hydraulic cylinders as the object of research, the dynamic analysis is carried on. The main contents are as follows:(1) Based on the principle of virtual displacement, the mathematical model of scissors aerial work platform driven by dual hydraulic cylinders is established, and the computing method of the hydraulic cylinder thrust and each hinge point force is researched.(2) Based on the software of ADAMS, the multi-rigid-body model of scissors aerial work platform is established. The impact parameters of hydraulic cylinder thrust are analyzed and optimized by the design evaluation function of ADAMS.(3) Based on ANSYS and ADAMS, the rigid-flexible coupling model of scissors aerial work platform is established. The simulation analyses are carried on for the dual hydraulic cylinders fully synchronized or not. To provide the data basis for modeling and simulation of hydraulic system, the particular situation of mechanical connection synchronization is analyzed by the combined method which uses inverse dynamics and control adjustment.(4) Based on AMESim and ADAMS, the mechanical and hydraulic co-simulation model of scissors aerial work platform is established. The simulation analyses are respectively carried on for the same cylinder bore, cylinder internal leakage and different cylinder bore. Through compared cylinder thrust, rod speed and hydraulic flow, the reference and basis are provided for selecting hydraulic cylinder and improving the structure of scissors aerial work platform.