Vibration and noise control considering waves propagation through continuous bodies from a dynamics perspective

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03956
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Kansai University
• Principal Investigator: YAMADA Keisuke 関西大学, システム理工学部, 教授 (80456798)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 波動 / 能動制御 / 騒音制御 / 進行波 / コムフィルタ / 振動解析 / モード解析 / 無反射境界

Outline of Final Research Achievements

In this study, instead of considering control methods with vibration modes that are standing waves, vibration and noise control methods that use traveling waves were proposed In this study, several methods were proposed to reduce noise propagating in a one-dimensional acoustic tube, based on the concept of using two loudspeakers to generate only forward traveling waves. This method avoids feedback because the reference microphone does not detect the controlled sound because the backward traveling waves are not generated by the loudspeakers. To conduct simulations of the proposed methods, we also proposed vibration analysis methods for acoustic tubes and beams with arbitrary impedances.

Free Research Field

機械力学・制御

Academic Significance and Societal Importance of the Research Achievements

従来の能動騒音制御では参照マイクロホンにおいて騒音だけでなく，制御音も検出し，それが系の安定性の低下につながっていたが，提案手法を用いれば制御音のフィードバックを回避できる．また，空間的・時間的細分を用いた進行波の抽出を提案したが，この方法を用いれば一方向の音波のみを検出できるため，前進波である騒音のみをリアルタイムに取り出せる．これらの成果は従来法にも適用できる，汎用性の高い手法である．また，振動解析手法は振動を定在波で考える場合にも利用することが可能で，こちらも汎用性の高い提案であり，機械力分野に広く貢献できる．