Development of a New Method for Reducing Impulsive Aerodynamic Noise by means of Active Control Method

主动控制方法降低脉冲气动噪声新方法的开发

• 批准号: 07555380
• 负责人: MATSUO Kazuyasu
• 金额: $ 4.1万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555380/
• 关键词: shock wave; aerodynamic noise; active control method; compression wave; wave motion; 衝撃音

(1) Numerical and aerodynamic analyzes were carried out on the emission of a propagating compression wave from an open end of a constant area tube. The generation mechanism of an impulsive wave from the open end was charified and the effects of various factors on the magnitude of the inpulsive wave were indicated.(2) The experiment on the impulsive wave generated by the emission of a compression wave and a shock wave from an open end of constant area tube was carried out. The results agree well with the numerical results mentioned above. It is shown that the boundry between the near field and the far field is about one diameter downstream of the open end of the tube.(3) In order to do active noise cancellation of a positive impulsive noise by adding an inverse wave, a negative impulsive wave generator was designed and constructed. This device utilizes unsteady mass efflux by an unsteady expansion wave of a shock tube.(4) The strength of the negative impulsive wave generated by the above device depends only on the maximun time rate of pressure change of the expansion wave at the shock tube exit. The relationship between the unsteady mass efflux and the negative impulsive wave was obtained.(5) The effects of various types of silencers on an impulsive noise emitted from an open end of a shock tube was investigated numerically and experimentally, and the design factors of the silencer reducing impulsive aerodynamic noise were suggested.

(1) 对从恒定面积管的开口端发射的传播压缩波进行了数值和空气动力学分析。阐述了开口端冲击波的产生机理，指出了各种因素对冲击波幅值的影响。(2)对等面积管开口端发射压缩波和冲击波产生冲击波进行了实验。结果与上述数值结果非常吻合。结果表明，近场和远场之间的边界约为管开口端下游一个直径。(3)为了通过添加反波来对正脉冲噪声进行主动消噪，设计并构造了负脉冲波发生器。该装置利用激波管非稳态膨胀波产生的非稳态质量流出。(4)上述装置产生的负冲击波的强度仅取决于激波管出口处膨胀波压力变化的最大时间速率。得到了非定常质量流出量与负脉冲波之间的关系。(5)通过数值和实验研究了不同类型消声器对激波管开口端脉冲噪声的影响,提出了消声器降低脉冲气动噪声的设计因素。

项目成果

H.D.Kim: "Passive Contorol of Unsteady Compression Wave Using Porous Walls" Proc.Int.Conf.Fluid Engineering. 3. 1467-1471 (1997)

H.D.Kim：“使用多孔壁的非定常压缩波的被动控制”Proc.Int.Conf.Fluid Engineering。

青木 俊之: "円管開口端におけ衝撃的騒音のパッシブコントロール" 可視化情報. 17・2. 27-30 (1997)

Toshiyuki Aoki：“圆形管道开口端脉冲噪声的被动控制”可视化信息17・2。

Heuydong Kim, et.al.: "Passive Contorol of Unsteady Wave Using Porous Walls" Proceedings of International Conference on Fluid Engineering. 3. 1467-1471 (1997)

Heuydong Kim 等人：“使用多孔壁非稳态波的被动控制”国际流体工程会议论文集。

Tosiaki Setoguchi: "A Study of a Negative Impulsive Wave Generator" Journal of Sound Vibration. 197・5. 573-587 (1996)

Tosiaki Setoguchi：“负脉冲波发生器的研究”《声音振动杂志》197・5（1996）。

Toshiaki Setoguchi, et.al.: "A Study of a Negative Impulsive Wave Generator" Journal of Sound and Vibration. 197-5. 573-587 (1996)

Toshiaki Setoguchi 等人：“负脉冲波发生器的研究”声音与振动杂志。