MTS Series 244 Actuators - Manual (Page 61)

Sideload Forces
Description Item
Sideload Forces 1
2. Calculate the actuator bearing load (L) using the following formula:
where:
S = Actuator stroke
A = Constant based on actuator bearing spacing
D = Constant based on actuator bearing size
3. Divide the actuator bearing load (L) by the actuator area constant (E) to determine the bearing pressure
(V).
where:
V = maximum allowable bearing pressure
E = Constant based on actuator bearing area
The maximum allowable bearing pressure (V) is 5.6 MPa (950 psi).
If the value produced by this step exceeds 5.6 MPa (950 psi), then you will have to select an actuator with
a larger piston rod diameter.
4. Calculate the bending stress placed on the actuator piston rod.
where:
(PRS) = piston rod stress
G = actuator piston rod diameter
The maximum allowable piston rod stress is 275.8 MPa (40,000 psi).
If the value produced by this step exceeds 275.8 MPa (40,000 psi), then you will have to select an actuator
with a larger piston rod diameter.
5. If the sideload force is applied to the actuator continuously, then determine the maximum allowable actuator
piston rod velocity for the bearing pressure (V) calculated in Step 3. This is the highest velocity that the
actuator can be allowed to experience when the current sideload is present.
Use the following equation:
Series 244 Actuators Product Information 61
Operation