火箭整流罩内降噪装置低频声学性能仿真
发布时间：2018-09-03 18:58
【摘要】：针对运载火箭整流罩内降噪装置所具有的特殊曲线颈部Helmholtz共鸣器,基于仿真方法研究降噪装置的低频声学性能.应用虚拟阻抗管法分析了Helmholtz共鸣器共振频率及吸声系数与其壁面厚度的变化关系.研究了降噪装置不同安装位置对圆柱空腔内平均声压级的影响.仿真结果表明,随着壁面厚度增加,Helmholtz共鸣器共振频率逐渐趋于刚性壁面的值,但吸声系数先增大后减小.降噪装置不同的安装位置可使空腔内平均声压级相差10dB以上,在工程应用中需将其放置于空腔模态振幅较大的位置.
[Abstract]:Aiming at the special curve neck Helmholtz resonator of the noise reduction device in the fairing of the launch vehicle, the low frequency acoustic performance of the noise reduction device is studied based on the simulation method. The relationship between the resonance frequency and the sound absorption coefficient of the Helmholtz resonator and the wall thickness is analyzed by using the virtual impedance tube method. The influence of different installation position of noise reduction device on the average sound pressure level in cylindrical cavity is studied. The simulation results show that the resonance frequency of Helmholtz resonator tends to the rigid wall with the increase of wall thickness, but the sound absorption coefficient increases first and then decreases. Different installation positions of the noise reduction device can make the average sound pressure level in the cavity more than 10dB. It is necessary to place the noise reduction device in the position where the mode amplitude of the cavity is large in engineering application.
【作者单位】： 北京理工大学宇航学院;北京强度环境研究所;
【基金】：国家部委航天资助项目
【分类号】：V475.1
本文编号：2220879
[Abstract]:Aiming at the special curve neck Helmholtz resonator of the noise reduction device in the fairing of the launch vehicle, the low frequency acoustic performance of the noise reduction device is studied based on the simulation method. The relationship between the resonance frequency and the sound absorption coefficient of the Helmholtz resonator and the wall thickness is analyzed by using the virtual impedance tube method. The influence of different installation position of noise reduction device on the average sound pressure level in cylindrical cavity is studied. The simulation results show that the resonance frequency of Helmholtz resonator tends to the rigid wall with the increase of wall thickness, but the sound absorption coefficient increases first and then decreases. Different installation positions of the noise reduction device can make the average sound pressure level in the cavity more than 10dB. It is necessary to place the noise reduction device in the position where the mode amplitude of the cavity is large in engineering application.
【作者单位】： 北京理工大学宇航学院;北京强度环境研究所;
【基金】：国家部委航天资助项目
【分类号】：V475.1
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