The Isolation of Random Vibration : Cases of Narrow-Band White Noise and Ramp Noise in Linear Systems with Two-Degrees-of-Freedom

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In the previous paper the isolation of random vibration was considered when an ideally white noise over the whle frequency range was loaded on the movable foundation of a two-degrees-of-freedom linear system.In many cases, however, frequencies are practically limited in a specially-fixed range. Then in this paper the case of narrow-band process is dealt with. First the case of white noise is investigated from the rms value of absolute accelerations and relative displacements and secondly the case of ramp noise, whose example is a power spectrum in the roughness of road, is considered and we shall compare the case of ramp noise with that of white noise qualitatively and quantitatively, where the introduction of equivalent spectral density is tried in order to correlate both cases.
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