Determination of Structural Damping Using the Impulse Response Function Brüel and Kjær Denmark

Format:

Conference/Event

Author/Creator:

Gade, Svend, author.

Conference Name:

Noise & Vibration Conference & Exposition (1991-05-01 : Traverse City, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1991

Summary:

This paper shows how the impulse response of each individual resonance in a frequency response function is calculated via a series of weighting functions and then used for damping calculations.The technique is not new (1)* but previously it has been indicated (2, 3) that when using pseudo-random excitation, T > 2.5τ must be fulfilled in order to make accurate damping measurements, where T is the Fast Fourier Transform record length and τ is the decay constant of the damping.It is shown that tolerable damping estimates can be made even if the record length T is as small as 0.05τ. This is because the short record length produces an aliasing phenomena on the amplitude of the impulse response function only - not on the slope of the decay

Notes:

Vendor supplied data

Publisher Number:

911052

Access Restriction:

Restricted for use by site license