Vibrations Flashcards
1
Q
spring constant equation
A
F = -kx
2
Q
Equation of motion (undamped) FREE vibration
A
= mx(..) + kx = 0
3
Q
SHM equation
A
a = -w(^2)x
4
Q
natural frequency equation
A
w = 2pif
5
Q
Equation of motion (damped) FREE vibration
A
= mx(..) + cx(.) + kx = 0
6
Q
damping ratio
A
z = C/Cc
7
Q
z for overdamped
A
z > 1
8
Q
z for underdamped
A
z < 1
9
Q
z for critically damped
A
z = 1
10
Q
Equation of motion (damped) FORCED vibration
A
mx(..) + cx(.) + kx = Fosin(wt)
11
Q
for torsional movement
A
k = kang m = Imass
