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This paper concerns the fields of the eccentric payload crane systems. We firstly introduce a four-rope-driven self-levelling crane system, which can adjust the payload to level precisely and safely by changing the lengths of the ropes. Then, the system model is deduced according to force equation, moment equation principles and geometry restrictions, without considering the acceleration items. Finally,...
This paper concerns the fields of self-levelling crane systems. We firstly design a practical but simplified 3D crane model. And then, focusing on the self-levelling adjusting mechanism, we derive its static equilibrium equations as the model equations, based on engineering requirements. Thirdly, we propose a try-and-get (TAG) method to realize self-levelling adjustment. Finally, we analyze the defects...
An adaptive sliding mode fuzzy control approach is proposed for a two-dimensional overhead crane. System linearization transforms the two-dimensional system to two independent systems: X-direction transport system and Y-direction transport system. Both the two systems are with the same dynamic model and both include two subsystems: positioning subsystem and anti-swing subsystem. A sliding mode fuzzy...
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