The sway motion of crane can be successfully suppressed by properly shaping the reference command. Input shaping is a one type of feed-forward shaping method that is based on linear superposition. In this paper, we present the impact of double pendulum type overhead crane (DPTOC) system on the effectiveness of input shaping. An unshaped bang-bang input force is used to determine the characteris...

BACKGROUND In this study, the measurement of job stress of electric overhead traveling crane operators and quantification of the effects of operator and workplace characteristics on job stress were assessed. METHODS Job stress was measured on five subscales: employee empowerment, role overload, role ambiguity, rule violation, and job hazard. The characteristics of the operators that were stud...

A gain-scheduled trajectory control is exemplary presented for two of six available axes of an overhead crane that allows for positioning and inclining the crane load according to specified trajectories. Besides its tracking capabilities, the proposed control provides an active oscillation damping. The overall control structure consists of independent axis controllers, which are adapted to meas...

A control strategy is presented for a 3-dimensional overhead crane. Using the differential flatness of the crane and a parameterization method, we calculate the optimal trajectory of the payload that results in minimum transfer time when there exist obstacles in the direct moving path. A learning algorithm is then used to generate the desired feedforward input signal that can drive the system o...