Abstract
One degree of freedom model has been used in many researches of a overhead traveling crane. We propose two degrees of freedom model considering motion of a hook, and solve the basic behavior making mass ratio between a hook and a crane load mass, length ratio between a lope and a sling lope into a parameter. As a result, When mass and length ratio become large, system can be analyzed by single degree of freedom model. However, when mass and length ratio approach near one, a crane load motion greatly increase because a hook gives excitation to a load.
