• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study on the Frequency Domain Adaptive Algorithm for Active Control of Low Frequency Acoustic Noise

Research Project

Project/Area Number 10650442
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Control engineering
Research InstitutionTokyo National College of Technology

Principal Investigator

KOSAKA Toshifumi  Tokyo National College of Technology Dept. Computer Science, Professor, 情報工学科, 教授 (60153524)

Co-Investigator(Kenkyū-buntansha) INOUE Yasuo  INC Engineering co. ltd., Investing Engineer, 研究者職
MATSUBAYASHI Katsushi  Tokyo National College of Technology Dept. Mechanical Engineering, lecturer, 機械工学科, 講師 (80239061)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1999: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1998: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordsactive noise control / frequency domain adaptive algorithm / 周波数領域適応アルゴリズム
Research Abstract

In the area of the active acoustic noise control, if the frequency domain adaptive algorithm is employed, there will be possibility that it can obtain high conversion speed with modeling the plant parameters, because every frequency bin is controlled independently. Moreover, since the frequency domain algorithm makes use of Fast Fourier Transform it reduces the amount of calculation drastically. In addition, the calculation of the filtered X signal is also reduced. The main theme of this project is examining the behavior of the frequency domain adaptive algorithm in both the simulation and real experimental apparatus.
First, the semi rectangular window function was investigated. It is used in estimation of the cross spectrum that is necessary in the frequency domain adaptive algorithm. The window function of semi rectangular is used for the reference signal of the active control system, while the normal rectangular window function is for the error signal of the active control system. It … More is proved that the usage of the semi rectangular window function for the reference signal provides proper estimation of impulse response without any bias. The block length for FFT should be more than twice of the tap length of control filter, but just twice is recommended. The block length for FFT that is twice of the tap length of control filter is used widely in overlapped method.
Second, the new the frequency domain adaptive algorithm was suggest. It updates the control filter specific characteristic without the prior modeling work. The algorithm uses every control trial result with weight, while the algorithm I suggested before uses recent two trial results. The new algorithm always estimates the parameter of the active system with all of control history, and it can follow the change of the transfer functions of both the primary acoustic path and the plant i.e. secondary path. Until now, the numeric simulation of the active control of the duct noise was completed. The numeric simulation of the active control of the duct noise with acoustic feedback path was completed. The active control of the real duct noise with acoustic feedback path was completed. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 小坂敏文、吉本定伸、松林勝志 他: "プラント同定事前処理のいらない周波数領域能動消音アルゴリズム"日本音響学会講演論文集. 439-440 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] KOSAKA, YOSHIMOTO, MATSUBAYASHI et al: "frequency domain adaptive algorithm without the prior modeling work"The Acoustical Society of Japan1999 Autumn meeting proceedings. 439-440 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 小坂敏文,吉本定伸,松林勝志他: "プラント同定事前処理のいらない周波数領域能動消音アルゴリズム"日本音響学会講演論文集. 439-440 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 小坂敏文 松林勝志: "プラント同定事前処理のいらない周波数領域能動消音アルゴリズム" 日本音響学会講演論文集 98年秋. 631-632 (1998)

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi