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Measuring the Loudness of Door Slams

Brüel & Kjær Denmark-Klaus Højbjerg
Published 1991-05-01 by SAE International in United States
No Abstract Available.
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Determination of Structural Damping Using the Impulse Response Function

Brüel & Kjær Denmark-Svend Gade, Henrik Herlufsen
Published 1991-05-01 by SAE International in United States
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.
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A New Two-Microphone Impedance Tube with Improved Microphone Design for Materials Testing

Brüel & Kjær Denmark-Klaus Højbjerg
Published 1991-05-01 by SAE International in United States
No Abstract Available.
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