Sometimes a machine vibrates far more than the forcing on it should explain, and the culprit is resonance — the structure has a favourite frequency and something is exciting it. Modal & Resonance 101 explains why every structure has natural frequencies, set by its mass, stiffness and damping, and what happens when a forcing frequency lands on one of them. This is the concept that separates analysts who fix vibration from those who merely re-balance a machine again and again without success.
You will learn to read mode shapes — the patterns in which a structure prefers to deflect — and the frequency response function that maps how a structure answers an input. The course puts a practical tool in your hands: the bump or impact test, which reveals natural frequencies quickly on site so you can tell a genuine resonance from an ordinary forcing-frequency fault. Finally you will learn the three levers for detuning a resonance — add or remove stiffness, add or remove mass, or add damping — so you can move the problem out of the operating range rather than living with it.