By M.O. Tokhi, S.M. Veres
This publication offers the proven basics within the sector of energetic sound and vibration keep an eye on and explores new and rising applied sciences and methods. the newest theoretical, algorithmic and
practical functions are coated
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Extra info for Active sound and vibration control : theory and applications
Problems in technical ANC applications are often posed by the loudspeakers. Very high low-frequency noise levels are typically encountered in exhaust stacks or pipes, demanding high membrane excursions without nonlinear distortion and, often, robustness against aggressive gases and high temperatures. On the other hand, a smooth frequency response function (as for hi-fi boxes) is not an issue because frequency irregularities can be compensated for by the adaptive filter. Special loudspeakers for ANC systems are being developed [44, 62, 72].
This is due to the reduction in the spacing between the sources. 2a. 5A, 0). 2a. 2a. This has resulted from moving the ANC in three-dimensional propagation 35 observation point closer to the primary source and, relatively, away from the secondary source. The reverse situation will hold if the observation point is moved away from the primary source and, relatively, closer to the secondary source. It follows from the above that moving the observation point further away from the secondary source (relatively closer to the primary source) will lead to an overall increase in the level of noise in the medium and a reduction in the physical extent of cancellation around the observation point.
Much information on research in the field of smart materials and structures is published in specialised journals such as Smart Structures and Materials or Journal of Intelligent Material Systems and Structures. 9. The predominant sources of interior noise are engine and wheel vibrations which propagate as structure-borne sound through the car body and finally radiate as airborne sound into the cabin. It is therefore reasonable to develop active engine mounts and active shock absorbers which are stiff enough to carry the static load, but dynamically resilient so that vibrations are not transmitted.
Active sound and vibration control : theory and applications by M.O. Tokhi, S.M. Veres