I'm new to the forums and this is my first post. I have quite a fundamental question about vibration. I have read many descriptions about the various measurement units, Velocity, Acceleration, Displacement. I understand the phase difference and how they are related. Everything I read states that Velocity is the best indicator of the destructive force of the vibration and acceleration is an indication of bearing or gear mesh fault. However, I can’t find a good explanation of why this is the case, in my mind any high amplitude vibration would be destructive?