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The Research Onactive Noise Controlalgorithms and Experimental Systems Based on cRIO

Author: LiZeChao
Tutor: ZhangLi；FengTao
School: Beijing Technology and Business University
Course: Mechanical Manufacturing and Automation
Keywords: cRIO FXLMS The mixed active noise control Pipeline Point source
CLC: TB535
Type: Master's thesis
Year: 2010
Downloads: 61
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Abstract


With the improvement of the level of social life , the noise problem is getting people 's attention and concern . Technically 1930s generation of active noise control (ANC) was first proposed , but because of the speed control hardware problem has not been large-scale practical . With the development of digital processing technologies and the introduction of adaptive filtering techniques , practical degree of active control technology gradually improve the the NI cRIO platform has the characteristics of the input and output ports reusable configuration , real-time computing speed and ease of development , this thesis is the development of the prototype system used for active noise control . Active noise control algorithms and structure of this thesis , and in-depth study the advantages and disadvantages of FXLMS algorithm under different conditions such as single-channel and multi- channel LMS , RLS , Lattice Subband FLMS active filter algorithm were analyzed and compared. This thesis, using Simulink and LabVIEW software simulation study of active noise control algorithms , analysis of the results with sub- channel LMS algorithm convergence factor μ control system stability and convergence rate , the weight coefficients of the adaptive filter algorithm recognition acoustic transfer characteristics measurement results of a comparative study to verify the reasonableness of algorithm . Application experiments and numerical simulation mixed model experimental system by piping as an object , the feedforward and active noise control algorithm simulation , and control purposes . This thesis is based on hybrid ANC algorithm in the the NI company's cRIO (FPGA) hardware and software platforms , the development of applications in LabVIEW FPGA module and real - time control module corresponding active control program , establish a point sound source for piping noise and space active noise control experimental system , two typical acoustic object noise active control . Point source system , 200Hz ~ 1000Hz single-frequency noise 3dB above the noise reduction amount ; For piping systems , 200 Hz to 1000Hz between white noise above 10dB noise reduction , noise reduction of single-frequency noise available up to 20dB.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use
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