MTS Series 215 Rotary Actuator - Manual (Page 55)

Summary of Side Load Calculations
Series 215 Rotary Actuator Product Manual Operation 55
Side load calculations
when using standard
flexures
The following calculations are used when flexures are installed on the foot
mounting and reaction bracket.
1. Calculate the center line offset (∆) between the actuator and reaction bracket
due to base plate twist by using the following formula:
2. Calculate the angle of flex ( θ) imposed on standard flexure by using the
following formula:
3. Compare the maximum horizontal angular deflection of the standard
flexures in use with the calculated angle of flex imposed on the flexures.
This will determine if the flexures are adequate. The relationship should be:
4. Calculate the lateral stiffness (k F 2
) of the diaphragm flexures by using the
following formula:
5. Calculate the bending moment (M 1 ) that is applied to the actuator and
reaction bracket with standard flexures installed.
6. Calculate the bending moment (M2) that is applied to the test specimen with
standard flexures installed.