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| | | (2) Loads with inertia forces | | |
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| | | Table 1.4 Calculation Examples for Loads with Inertia Forces Considering the acceleration and deceleration | | |
| | | Load on one block | | |
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| | | | | | | | | | | 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 | | |
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| | | 4jJ » 4jJ c/2 c/2 | | =ltf | | |
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| | | Velocity (m/s) | | |
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| | | External force (N) Weight of object (N) Gravitational acceleration(9.8m/sec2) | | |
| | | F : W : g : | | |
| | | Times (s) | | |
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| | | 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. | | |
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| | | Table 1.5 Calculation Examples for Mean Load (Pm) Operation Condition Mean load | | |
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| | | 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 | | |
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| | | Linear variation | | |
| | | Pm= 1/3 ( Pmin+ 2 • Pmax) | | |
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| | | Pm : Mean load Pmin : Min. Load Pmax : Max. Load | | |
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| | | Sinusoidal loading | | |
| | | Pm= 0.65- Pm | | |
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| | | Pm : Mean load Pmax : Max. Load | | |
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