Page 24 - Modular design for machine tools

xxii Nomenclature

µ : Tangential force ratio
T
ξ , ξ : Compensation factor related to slideway configuration
k
g
τ: Shear stress
ϕ,∆ϕ: Inclination angle
ϕ : Torsional angle
T
ψ: Damping factor, energy loss factor
ψ : Torsional angle
T
ω: Angular frequency
3. Nomenclature for Appendices
A: Cross-sectional area
B , B : Constants
0
2
C: Sound velocity in medium
E: Young’s modulus
E : Echo height ratio ( h /h )
R
e0
e
E *: 1 – E R
R
I: Cross-sectional moment of inertia (second moment of area)
K: Stiffness
L: Representative length
M: Moment
P : Sound pressure
S
R: Surface roughness
R : Reflection rate of sound pressure
p
S, ∆S: Area
W: Representative load
WDE: Energy of reflected echo
b: Width of beam
f: Frequency
g: Acceleration of gravity
h: Height (thickness) of beam
h e : Height of echo on CRT
h e0 : Height of initial pulse on CRT
h w : Transformed echo height
t: Time
x: Reflected echo
y: Deflection of beam, vibration amplitude of beam
γ: Specific weight
κ : Load scale factor
s
λ : Length scale factor
s
ρ: Density of medium
: Time scale factor
τ s