For today’s demands for highest reliability, durability, and environmental performance of machines, electronics, and mechanical components, static measurements of stress/strain properties are not sufficient. Dynamic measurements are necessary and Vibration Analysis (VA) has subsequently found widespread use.
Vibration can be desirable – for example, the motion of the wooden body of a violin, a mobile phone vibrator, the cone of a loudspeaker, or the vibration of buildings during an earthquake.
In many cases, however, vibration is undesirable because of wasted energy, fatigue symptoms, or the creation of unwanted sound. For example, the vibrational motions of engines, electric motors, electronics, or any mechanical device in operation are typically unwanted. Such vibrations can be caused by imbalances in the rotating parts, uneven friction, the meshing of gear teeth, material design flaws, and more. Careful designs usually minimize unwanted vibrations. Experimental vibration measurements are typically used to validate analytical models, or used instead in case theoretical models are impossible or inaccurate.