Abstract: In this paper, a novel periodic sliding mode control method is designed for 4-DOF tower crane systems with unmatched disturbances as well as unknown/time-varying control directions.

Abstract: Obstacle avoidance presents a great challenge for the control system of tower cranes due to their uncertain dynamics, underactuated nature, and strong coupling. Aiming at these issues, a ...

To Ryan Williams, it's all mental. Williams is still getting his share of targets. Through five games, he is second on the team with 21 receptions for 336 yards and three touchdowns. He's still made ...