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Basic equation

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$ω$

Air-particle collision frequency
$n$

Air number density
$σ_{all-A}$

Allowable axial stress
$P_{all-B}$

Allowable bearing stress
$σ_{all-B}$

Allowable bending stress
$σ_{all-C}$

Allowable combined stress
$τ_{all-S}$

Allowable shear stress
$p_{air}$

Atmospheric pressure air
$d_1$

Basic minor diameter of external thread
$D_1$

Basic minor diameter of internal thread
$d_2$

Basic pitch diameter of external thread
$D_2$

Basic pitch diameter of internal thread
$d_3$

Basic smaller diameter of external thread
$A_b$

Cross‐sectional area of the bolts
$ρ_{air}$

Density air
$t_1$

Depth in the hub
$t$

Depth in the shaft
$μ$

Dynamic viscosity
$H$

Geopotential altitude
$g$

Gravitational acceleration
$r_2$

Groove rounding
$h$

Height key
$H$

Height of fundamental triangle
$ν$

Kinematic viscosity
$H_b$

Lower limit geopotential altitude
$p_b$

Lower limit pressure
$T_b$

Lower limit temperature
$r_1$

Max. rounding the key
$σ_{max}$

Maximum normal stress
$v̄$

Mean air-particle speed
$l$

Mean free path of air particles
$σ_{nom}$

Nominal or reference normal stress
$H_p$

Pressure scale height
$γ_{air}$

Specific weight air
$a$

Speed of Sound
$K_t$

Stress concentration factor
$K_{ts}$

Stress concentration factor for shear stress
$K_{tg}$

Stress concentration factor with the nominal stress based on gross area
$K_{tn}$

Stress concentration factor with the nominal stress based on net area
$T$

Temperature $ T $
$β$

Temperature gradient $ β $
$λ$

Thermal conductivity
$l_t$

Tolerance of key length
$t_{1t}$

Tolerance of the groove height in the hub
$t_t$

Tolerance of the groove height in the shaft
$b$

Width key

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Basic equation