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Abstract This paper applies an efficient adaptive feedforward compensation (AFC) algorithm for periodic disturbance cancellation on a hard disk drive (HDD) servo system. Such an algorithm is shown to be equivalent to a linear time invariant (LTI) model. With the help of this equivalence, we can...
Abstract This research describes several characteristics of tunnel continuous waves (TCW), which are a kind of low-frequency pressure wave radiated from railway tunnel portals. Several theoretical results are presented and measurement data obtained in field tests. Ratios of the amplitude and the...
Abstract A transverse vibration model of a moving paper web is established by the rectangular mebrane theory. The differential equation of the moving paper web is established by considering constraint on the intermediate printing cylinders as an intermediate support, then the frequency equation...
Abstract The paper reviews perception of low frequency noise (LFN) and the responses of people to LFN. Sometimes, when there are complaints of LFN and its effects, a specific noise cannot be measured. The possibilities are considered for development of enhanced sensitivity, for alternative...
Suffering from more or less continuous and more or less steady low pitched sounds at home can be a serious threat to well-being. Often the sound source is not obvious or cannot be found. In many cases there is no clear evidence from the analysis of the ambient sound what the disturbing sound...
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