Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : February 28, 2017 - March 03, 2017
Dynamic characteristics of gearings in giant wind turbines are demanded for reliability improvement since they need situating in harsh condition due to varying wind and grid safety. This work focuses on transient dynamic analyses of a planetary gear system (PGS) especially at start-up stage including gross motion and gravity effect. At first, a 3D discrete dynamic model of PGS is formulated. The time varying equivalent spring stiffness can be derived for meshing gear pairs but only the stiffness average is adopted in the work. Transient responses of a PGS are obtained under assigned initial and operation conditions. Then, the dynamics of contact pairs of gears and bearings are analyzed. The transient responses are solved under four types of initial and operation conditions. Dynamic forces of a PGS are verified by a published experimental result. Finally, dynamic characteristics under kinds of operation conditions simulating the speed and torque shifting process during start-up or stop of the PGS are resulted.
