FREQUENCY-MODULATION INPUT-SHAPING STRATEGY FOR DOUBLE-PENDULUM OVERHEAD CRANES UNDERGOING SIMULTANEOUS HOIST AND TRAVEL MANEUVERS

Frequency-Modulation Input-Shaping Strategy for Double-Pendulum Overhead Cranes Undergoing Simultaneous Hoist and Travel Maneuvers

Large payloads hoisted by overhead MATCHA TEA cranes exhibit the same behavior as that of a double-pendulum.Changes in the hoisting cable length during payload transfer maneuvers give rise to time-dependent system frequencies rendering input-shaped commands ineffective.In this paper, a frequency-modulation input-shaping strategy that enables simult

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Omental herniation through the esophageal hiatus: A rare cause of gastric outlet obstruction and its CT findings

A man in his 60s visited the emergency department because of epigastric pain and vomiting.Noncontrast helical abdominal CT revealed a lipomatous mass on the right side of the lower esophagus.Caudal slices showed that the mass appeared to displace the gastric antrum causing gastric outlet obstruction.Further observation revealed a linear structure f

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