Balancing of Machinery
In the previous chapter, we have studied forces that act on rigid bodies due to accelerations. We named them inertia forces and studied the effect they have on a mechanism. In most situations, these forces have a negative effect on the machine, as they cause parasite time-periodic stress with negative consequences for the machine. Vibration is an important issue that will be addressed further ahead in this book. Usually, the best way to handle vibrations in a machine is to equilibrate inertia forces and torques with other forces. The process of studying and making changes in a machine in order to reduce or eliminate shaking forces and torques is called balancing. A link in a planar linkage can have two basic types of motion, rotation and translation, which give raise to two different balancing processes: the balancing of rotating masses and the balancing of masses with reciprocating linear motion. Both methods will be analyzed in this chapter.