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Fig. shows the limits for the fatiguedecreased proficiency boundary in terms of the amplitude, frequency and duration for a vertical vibration (along the toe-to-head axis). Exposure limits are 6 dB above and reduced comfort values 10 dB below these values, the shape of the contours remaining the same. The human subject is most sensitive to vertical vibrations in the frequency range 4-8 Hz. Above 8 Hz the response contours correspond to constant velocity amplitudes. e. containing many frequencies) to be evaluated .

The subject matter of parts 1,2 and 3 of IS0 2631 are also cover by BS6841 and BS6472. Although there are some similarities there are also some very significant differences between the British and International Standards. One of these is the introduction of the concept of Vibration Dose Value into the British Standards, in order to take into account the effects of impulsive and intermittent vibration. THE EFFECT OF VIBRATION ON BUILDINGS It is almost inevitable that high noise and vibration levels experienced by the occupants of a building should give rise to concern about the possible effects that these may have on the building.

Fourier (1768-1830) who showed that any repetative function can be broken down (ie analysed into) a series of sinusoidal functions. The waveform of a random vibration never repeats itself and has a continuous 35 frequency spectrum, ie one in which the lines have moved infinitesimally close together. The spectrum of a single transient vibration is also a continous spectrum, with, usually, higher levels at the lower frequencies and with the levels reducing at higher frequencies. Repeated transients produce a line spectrum in which the line spacing is determined by the repetition rate, but where the shape of the spectrum is determined by the waveform of the transient.

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Architecture - Acoustic Notes - School Of Architecture And Interior Design


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