MTS Series 215 Rotary Actuator - Manual (Page 52)

Series 215 Rotary Actuator Product Manual 52
Test Setup Using Diaphragm Flexures
Operation
Calculate centerline
offset
Calculate the center line offset (∆) between actuator and reaction bracket due to
base plate twist by using the following formula:
Calculate flex angle
Calculate the angle of flex (q) imposed on each diaphragm flexure by using the
following formula:
Compare angular
deflection
Compare the maximum horizontal angular deflection of the diaphragm flexures
(qF2=0.015 rad.) with the calculated angle of flex imposed on foot mounting and
reaction bracket flexures (q=0.000305rad.) to determine if the flexures are
adequate.
θ < θ
F 2
In the case of the sample calculation, the flexures are adequate. If the flexures are
not adequate, additional flexural capability is required or base plate stiffness
must be increased. Consult MTS Systems for assistance.
Calculate lateral
stiffness
Calculate the lateral stiffness (k F 1
) of the diaphragm flexures by using the
following formula: