Exponential Window

A special windowing function for minimizing leakage in lightly damped structures that is used in impact testing.

In a lightly damped structure, oscillations may not die out within the sampled time data block, T, which results in leakage error. An exponential window adds damping to the time signal to force it to die out within the time T, thus minimizing leakage. The added damping is then removed mathematically after the signal is processed.

See also: Modal Analysis, Windowing.

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Subjects: Noise & Vibration