Identical unbalanced masses m are secured to gears a and disks b so that either the resultant of the unbalanced forces acts along an axis perpendicular to the plane of the drawing, or a torque is produced with respect to this axis, or with respect to axis x-x. Frame 3 of the machine is rigidly attached to the structure being tested. Rotation is powered by two electric motors C₁ and C₂ linked together by meshing gears a. When shafts 1 and 2 rotate, a vibrational load is applied to frame 3 and to the structure being tested.
$2960$CxG,VM$