FEM Design of a Cutting-Edge Support System for Micro-GT

Table 1

Design data of the reference micro-GT unit as well as the spline coupling.

	Design variable [unit]	Value
Micro-GT data	Rotational speed [rpm]	70,000
	Shaft diameter [mm]	15
	Power P [kW]	110
	Pressure ratio	4
	Turbine thrust [N]	1100 (case A), −1700 (case B)
	Compressor thrust [N]	−600 (case A), 1200 (case B)
	Total axial load [N]	500 (case A), −500 (case B)
	Radial load (rotor weight) [N]	40
	Turbine torque [N m]	30
	Compressor torque [N m]	−15
Helical spline coupling data	Type	IS0 141982 (E), shaft and hub
	Length [mm]	220
	Outer diameter [mm]	220
	Spline inner (or pitch) radius [mm]	5.5
	Spline outer radius [mm]	7
	Number of splines	6
	Side distance [mm]	3
	Young’s modulus [GPa]	206
	Poisson’s ratio	0.3