rte4563: Static force actually has two components because it is the force that is acting "all the time" during normal operation. The general equation is:
Static force = XXX (units of force) +/- 0.5*(weight of machine)
The first piece is the force exerted by the torque of the machine as it tries to rotate the stationary portion in opposition the shaft rotation. In this case, the force is the torque divided by the horizontal distance from the shaft centerline to the hold down bolt location. With that said, it acts to "push" the machine into the foundation on one side and "pull" it away on the other side. The second piece is a force related to the weight of the machine itself, acting downward because of gravity. If the machine is mounted above a beam, the force acts to push the machine into the beam. If it is hung under a beam, the force acts to pull the machine away from the beam. The total combined force is (usually) divided between two or four points of contact - essentially, where the rotating machine (or its sub-base) is bolted to the foundation.
Short Circuit force is a result of an electrical incident. There are multiple cases, but effectively the description is that one (or more) phases become shorted to another phase or to ground. When this occurs, the instantaneous torque increases dramatically (up to as much as 8X the normal rated torque). It usually doesn't last long when a machine is motoring (i.e., driving a process), but can last a while when generating (i.e., driven by a prime mover or process). For your purposes, it can be viewed as a "torque" event, which is the first part of the "static" equation above. Instead of XXX units of force, you'd use (8)*(XXX) units of force and thus get a new total. You'd still have to account for the weight of the machine for foundation reactions, since sometimes it acts with the torque load and sometimes against.
Faulty synch is just what it implies - the machine attempts to synchronize out of phase with the electrical supply. In this case, the peak torque is going to be roughly 2X the rated torque, which occurs when the breaker or contactor is closed at 180 degrees phase opposition. As per the previous cases, you still have to account for the machine weight for foundation reactions as the "fault" force is related to torque, and the weight sometimes acts to aid and sometimes to oppose it.
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