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Q factorSharpness of Resonance. Q-factor is the amplification ratio of resonant peaks. Note that there is an inverse relationship between Q-factor and percentage bandwidth. A measure of the losses in a resonance system. The sharper the tuning curve, the higher the Q. Another term for amplification factor.
Quadrature PickingA manual technique that is used to estimate the mode shapes of a structure with lightly coupled modes. The technique takes the imaginary parts of the frequency response function at the modal frequency as a measure for the mode shape component for the particular mode and the particular degree-of-freedom.
Quadrature ResponseAnother name for the imaginary part of the frequency response function.
Quasi-periodic SignalA quasi-periodic signal is a deterministic signal whose spectrum is not a harmonic series, but nevertheless exists at discrete frequencies. The vibration signal of a machine that has non-synchronous components resembles a quasi-periodic signal. In most cases, a quasi-periodic signal is actually a signal containing two or more different periodic components.
Quasi-stationary SignalsSignals that are divided into short time segments.Brüel & Kjær Sound & Vibration Dictionary End User Agreement