Linear guideways ( complete program ) - HIWIN - #9

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(2) Loads with inertia forces
Table 1.4 Calculation Examples for Loads with Inertia Forces
Considering the acceleration and deceleration
Load on one block
Constant velocity
pi~p4=t
Acceleration
P1=P3=^W- + -1-
W
• g
Vc ' TT
P2=P4=^---1-
W • g
Vc ' TT
Deceleration
p1=p3=^w---2-
W
• y
Vc ' T3
p2=p4=t+t
W
' "g"
Vc ' T3
Movement
4jJ » 4jJ
c/2 c/2
=ltf
o
Velocity (m/s)
External force (N)
Weight of object (N)
Gravitational acceleration(9.8m/sec2)
F : W : g :
Times (s)
1-5-2 Calculation of The Mean Load for Variable Loading
When the load on a linear guideway fluctuates greatly, the variable load condition must be considered in the life calculation. The definition of the mean load is the load equal to the bearing fatigue load under the variable loading conditions. It can be calculated by using table 1.5.
Table 1.5 Calculation Examples for Mean Load (Pm) Operation Condition Mean load
Step load
Pm=^/l/L(P13- L1 + P23 • L2+...+Pn3 • Ln)
Pm: Mean load Pn : Stepping
L : Total running distance
Ln: Running distance under load Pn
Linear variation
Pm= 1/3 ( Pmin+ 2 • Pmax)
Pm : Mean load Pmin : Min. Load Pmax : Max. Load
Sinusoidal loading
Pm= 0.65- Pm
Pm : Mean load Pmax : Max. Load

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