By Thomas Kletschkowski
This e-book provides a mechatronic method of energetic Noise keep an eye on (ANC). It describes the necessary components of method idea, engineering acoustics, electroacoustics and adaptive sign processing in a finished, constant and systematic demeanour utilizing a unified notation. additionally, it contains a layout technique for ANC-systems, explains its software and describes instruments for use for ANC-system layout. From the learn viewpoint, the e-book provides new methods to sound resource localization in weakly damped interiors. One relies at the inverse finite aspect process, the opposite is predicated on a valid depth probe with an lively unfastened box. moreover, a prototype of an ANC-system in a position to succeed in the actual limits of neighborhood (feed-forward) ANC is defined. this is often one instance for utilized learn in ANC-system layout. different examples are given for (i) neighborhood ANC in a semi-enclosed subspace of an plane shipment carry and (ii) for the combo of audio leisure with ANC.
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Additional info for Adaptive Feed-Forward Control of Low Frequency Interior Noise
17) The inverse operation is defined by X(j ω)•–◦x(t) = F−1 X(j ω) := 1 2π +∞ −∞ X(j ω)ej ωt dω. 19) and the auto spectral density (ASD) Sxx (j ω) = F rxx (τ ) . 21) Gxx (j ω) = 2Sxx (j ω) with 0 ≤ ω < ∞. 22) and In general the CSD is a complex function of frequency, whereas the ASD is a real valued quantity. 19) is evaluated for two signals xT (t) and yT (t) that are observed in the time interval T .
G. in (Fuller et al. 1997) and (Johansson 2000). In the first reference the authors report that: “commercial systems have been installed in aircraft such as the Saab 340 or Saab 2000 and typically comprise of 24–36 optimally located loudspeakers in conjunction with 48–72 error microphones. The total weight is around 70 kg for a 10 dB attenuation”, calculated from the changes in the sum of the squared sound pressure measured at all control microphones, “in the propeller fundamental frequency. Each speaker has a maximum power consumption of 25 Watts and approximately 1 km of wire is required in the Saab 2000.
1 Three different approaches to active control of interior noise . 7 Characteristic values directly obtained from time history of signal 28 Eigenfrequencies and eigenmode shapes of a finite duct with length L . . . . . . . . . . . . . . . 1 Comparison of active control strategies . . . . . . . 2 The multi-channel filtered reference least mean square algorithm in time domain with K reference signals, M control signals, L error signals, I coefficients in each control filter, and J coefficients for each secondary path model .