Influence of Fir-Tree Tenon Blade Parameters on Blade Dynamic Characteristics

Table 2

The parameters of the fir-tree tenon structure.

Symbols	Meaning	Unit
N	Centrifugal force on the blade	N
Nij	Positive pressure generated by N on the i-th pair of contact surfaces j	N
y (t)	Displacement of blade roots in the horizontal direction	mm
dij	Displacement of x on the tangent of the i-th pair of contact surfaces j	mm
αi	The angle between the i-th pair of contact surfaces 1 and the horizontal direction	°
βi	The angle between the i-th pair of contact surfaces 2 and the horizontal direction	°
Aij	The surface area of the i-th pair of contact surfaces j	mm^2
	Displacement of the friction dampers on the i-th pair of contact surfaces j	mm
kij	Coefficient of shear stiffness on the i-th pair of contact surfaces j	N/mm
μij	Coefficient of friction on the i-th pair of contact surfaces j	—
fij	Friction on the i-th pair of contact surfaces j	N