Dynamic modulus Ratio of stress to strain under vibratory conditions. Excitation An external force or motion applied to a system that causes the system to respond in same way. Force Retardation Agency which gives a mass an acceleration. Impact Excitation of a structure with a force pulse e.g. using an Impact Hammer. Impulse Well defined pulse.
Periodic impulse is repeated impulses.
An electrical frequency filter used to convert a vibratory acceleration signal to one whose amplitude is proportional to velocity or displacement. A vector quantity that specifies time rate of change of acceleration. Mechanical impedance Ratio of applied force to resulting velocity during simple harmonic excitation. Mobility Mechanical admittance. Inverse of mechanical impedance.