This paper presents how the multibody dynamics is utilized in the company. In recent years, the advance evaluations considering the dynamics of the products become to be the mainstream on the design state in new product development. Moreover, the multibody dynamics is utilized to develop the advanced technology of the new products. As it becomes to be possible that the dynamics of the products is examined even in the design stage at the good accuracy by the progress of the multibody dynamics, the essential solutions and the quantitative evaluations can be carried out in the development of the new products. In the development of the completely new concept machine, the multibody dynamics is necessary to carry out the system optimization of the machine. In this paper, the activities using the multibody dynamics are introduced through the cases of the evaluation on the disorder winding of the wire rope in the tower crane, and the evaluation of the power consumption in the hydraulic excavator.

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