By M.O. Tokhi, S.M. Veres
This ebook provides the demonstrated basics within the sector of lively sound and vibration regulate and explores new and rising applied sciences and strategies. the newest theoretical, algorithmic and
practical purposes are lined
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Extra resources for Active sound and vibration control : theory and applications
A loudspeaker is mounted next to the exhaust pipe end, and is fed from a waveform synthesiser, realised with digital electronics. An error microphone is placed in the superposition zone and yields a control signal by which the loudspeaker output is optimised. The sync pulses (obtained, e. , by a toothed wheel and an inductive probe) guarantee that the compensation signal tracks changing engine rotation speed automatically. The waveform is adapted using a trial-and-error strategy either in the time domain or, more quickly, in the frequency domain.
1 is to reduce the level of noise to zero at the observation points. 2) Yco 1 = U D E M C L [ I - FMCL]- !! where I is the identity matrix. Substituting for Yoo and Yco from eqn. 2) into eqn. 4) 30 Active Sound and Vibration Control This represents the required controller design relation for optimum cancellation of noise at the observation points. 3 Physical extent of cancellation The interference of the component waves through a process of realisation of an ANC system, effectively, leads to a pattern of zones of cancellation and reinforcement in the medium; noise is cancelled in some regions and reinforced in others.
Thus, for cancellation of the primary wave to be achieved at a point in the medium, the amplitudes and phases of the secondary waves should be adjusted relative to the primary wave such that the condition in eqn. 9) is satisfied. 2 Three-dimensional description of cancellation Realisation of the required continuous frequency-dependent controller characteristics given in eqn. 1 will ensure cancellation of the noise at and in the vicinity of all the observation points. In this manner, a region of cancellation is created around each observation point.
Active sound and vibration control : theory and applications by M.O. Tokhi, S.M. Veres