By Thomas Kletschkowski
This e-book offers a mechatronic method of lively Noise keep an eye on (ANC). It describes the necessary parts of process concept, engineering acoustics, electroacoustics and adaptive sign processing in a accomplished, constant and systematic demeanour utilizing a unified notation. moreover, it features a layout method for ANC-systems, explains its software and describes instruments for use for ANC-system layout. From the examine viewpoint, the publication provides new ways to sound resource localization in weakly damped interiors. One is predicated at the inverse finite point strategy, the opposite relies on a legitimate depth probe with an energetic unfastened box. additionally, a prototype of an ANC-system capable of achieve the actual limits of neighborhood (feed-forward) ANC is defined. this can be one instance for utilized learn in ANC-system layout. different examples are given for (i) neighborhood ANC in a semi-enclosed subspace of an airplane shipment carry and (ii) for the combo of audio leisure with ANC.
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Fig. 14 Finite element model of a VLJ mock-up used to verify the performance of optimized actuator positions . . . . . . Fig. 15 Comparison of measured and calculated FRF for f = 100 Hz. Magnitude is shown in dB rel. 20 Pa · s2 m−1 (left); phase is shown in degree (right) . . . . . . . . . . . Fig. 16 Comparison of measured and calculated FRF for f = 300 Hz. Magnitude is shown in dB rel. 20 Pa · s2 m−1 (left); phase is shown in degree (right) . . . . .
23 Broadband ANC performance with the multichannel MFxLMS at microphone positions M1 (left) and M8 (right), adapted from (Pabst et al. 2009) . . . . . . . . . . . . . Fig. 24 Attenuation mapped at microphones M7 and M8, vertically and horizontally. Measurement points shown as white dots. Black dots represent the actual position of the error sensors that were not included by mapping . . . . . . . . . . . Fig. 25 Top: Cabin microphone signal with ANC (switched on after approximately 2 s).
Fig. 20 Acoustic mock-up interior with set, electro-dynamical loudspeakers and microphones mounted close to the backrests (from Pabst et al. 2009) . . . . . . . . . . . Fig. 21 Overview of the experimental system layout used for real-time testing of a combined ANC-audio system in a very light jet mock-up (from Pabst et al. 2009) . . . . . . . . . Fig. 22 Total sound pressure level (50 Hz < f < 500 Hz) with and without active control shown for all microphone positions (adapted from Pabst et al.
Adaptive Feed-Forward Control of Low Frequency Interior Noise by Thomas Kletschkowski