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放端发射的传播压缩波进行了数值和空气动力学分析。从开口端发出冲动波的产生机制是构造的，各种因素对螺栓波的大小的影响。（2）进行压缩波产生的脉冲波和从恒定区域管的开放端产生的冲击波产生的实验。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大约是管的开口端的下游直径。（3）为了通过添加逆波来消除正冲动噪声的主动噪声，设计和构造了负冲动波发生器。该设备通过冲击管的不稳定膨胀波利用了不稳定的质量外排。（4）上述设备产生的负冲动波的强度仅取决于电击管出口处膨胀波的最大压力变化的最大时间。 （5）在数值和实验上研究了各种类型的消音器对从冲击管开口端发出的冲动噪声的影响，并在数值和实验上研究了各种类型的消音器对脉冲噪声的影响，并提出了消音器降低冲动性空气动力学噪声的影响。

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）。

瀬戸口俊明: "衝撃騒音低減を目的とした負のパルス波発生装置に関する研究" 日本機械学会論文集. 61・587. 2485-2490 (1995)

Toshiaki Setoguchi：“用于降低冲击噪声的负脉冲波发生器的研究”日本机械工程师学会会刊 61・587（1995 年）。