Dynalabs DYN-MS-250 Product Manual - Page 11

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3.3) Shaker-Structure Interaction (Stingers)

Stingers used in modal shakers are thin rods with a specific length yielding
low lateral and high axial stiffness. The high axial stiffness is necessary to
transmit the shaker force directly to the test structure with high efficiency
whereas the low lateral stiffness is necessary for protecting the shaker from
moment loads and to minimize shaker alignment issues. The stingers are
mounted on the shaker via a chuck. Force or impedance head sensors can be
mounted on the other side.
The Dynalabs modal shakers stinger sets include chuck and 3 stinger rod
sizes. The chuck consists of two pieces. The collet squeezes the stinger with
the tightening effect of the nut. Choose a collet size as close to your stinger
diameter as possible.

3.4) Shaker Alignment

Shaker alignment is a very important step of modal testing. Poor alignment
can cause force components in unmeasured directions and can even damage
the shaker. In order to overcome this problem, the trunnion can be adjusted
for proper alignment. Furthermore, the tip of the stinger can be removed
during the alignment process in order to reduce the free end deflection as
shown above.
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