1 Degree of motion, 2 degree of freedom system
o No platform pitch, roll, yaw, horizontal
motion etc...
Frictionless, undamped motion
Motor spins at a constant speed
o Ignore effect of gravity on spinning mass
Linear range of spring operation
o Not bottoming out or over-stretching
Frame is rigid and does not vibrate
From the system schematic in Fig. 4 and using the
assumptions above, the system equation in Eq. 1 can be
derived, which characterizes the vibratory system [7].