Abstract

Anti-vibration control of turntable ladders is effective by controlling the steel ropes inserted in the hollow handrails. Previous studies that considered idealized conditions, such as ignoring friction, piston mass, and hydraulic oil compressibility, can not be strongly generalized. This study addresses these problems by describing in detail the equipment serving the anti-vibration solution, building a mathematical model for the steel rope hydraulic control system considering the above factors, and controlling the rapid extinguishing of vibrations on a model simulated in Matlab-Simulink. Furthermore, the simulation of the relationship between the control signal and oil flow through the proportional distribution valve produced a signal flow curve that was asymptotic to the actual. The results showed a difference compared to previous studies. Although the solution was only implemented on the lowest ladder section with the most unfavorable conditions, the time for vibration on the top ladder reached amplitudes of 3 and 5mm in 3 and 5s for empty and full baskets, respectively.

Full Text
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