Investigation of acoustic liner vibroacoustic response and its influence on impedance
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摘要: 声衬在高声压级声波激发下产生声振响应，刚性假设不再成立，其结构振动会对吸声产生一定影响。本文针对振动对声衬吸声的影响和声振响应开展实验研究，通过参数化研究，获得了不同工况和不同穿孔板几何参数下声振响应对声阻抗的影响规律。实验结果表明：穿孔板振动会导致声阻在结构共振频率处出现波峰或波谷，吸声系数出现“额外”的吸声波峰或吸声波谷；穿孔率和声压级的增大会减弱振动的影响，且存在一个临界穿孔率；穿孔板参数会影响高声压级下结构振动导致声阻变化的特征；在结构共振频率附近，小孔–面板速度相位差会发生突变，导致相对速度增大，吸声效果改变。Abstract: The acoustic liners produce vibroacoustic response under the excitation of sound waves at high sound pressure level, and the rigid structure assumption is no longer applied. Their structural vibrations have a certain impact on sound absorption performance. The work presented here is an experimental study on the influence of panel vibrations on sound absorption and vibroacoustic response, and the influence law of vibroacoustic response on acoustic impedance under different perforated plate geometric parameters is obtained through parametric research. The experimental results show that the vibration of the perforated plate causes resistance to the generation of peaks or dips at the structural resonance frequency, and the sound absorption coefficient generates extra absorption peaks or dips that cannot be understood assuming rigid acoustic liners. The increase of the perforation rate and sound pressure level suppresses the influence of vibration, and there is a critical perforation rate. Perforated plate parameters affect the characteristics of resistance changes caused by structural vibration at high sound pressure levels. The phase difference between the small holes and the panel near the structure resonance frequency changes abruptly, resulting in an increase in the relative velocity and a change in the sound absorption performance.
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Key words:
- acoustic liner /
- acoustic impedance /
- vibroacoustic
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图 1 声阻抗和声振响应测量系统
Figure 1. Acoustic impedance and vibroacoustic response measurement system
图 4 L1实验值与经验模型预测声阻对比（LS = 90 dB）
Figure 4. Comparison of experimental and predicted resistance of L1 at LS = 90 dB
图 5 L1实验值与经验模型预测声抗对比（LS = 90 dB）
Figure 5. Comparison of experimental and predicted reactance of L1 at LS = 90 dB
图 6 L1实验值与经验模型预测声阻对比（LS = 146 dB）
Figure 6. Comparison of experimental and predicted resistance of L1 at LS = 146 dB
图 7 L1实验值与经验模型预测声抗对比（LS = 146 dB）
Figure 7. Comparison of experimental and predicted reactance of L1 at LS=146 dB
图 8 L1实验值与经验模型预测吸声系数对比
Figure 8. Comparison of experimental and predicted absorption coefficient of L1
图 9 L1实验件在不同声压级下的声阻抗及吸声系数
Figure 9. Experimental results of acoustic impedance and absorption coefficient of L1 at different sound pressure level
图 10 L3实验件在不同声压级下的声阻抗及吸声系数实验结果
Figure 10. Experimental results of acoustic impedance and absorption coefficient of L3 at different sound pressure level
图 11 L4和L10实验件在不同入射声压级下的声阻
Figure 11. Experimental results of acoustic resistance of L4 and L10 at different sound pressure level
图 12 L3和L4实验件在不同入射声压级下的声阻实验结果图
Figure 12. Experimental results of acoustic resistance of L3 and L4 at different sound pressure level
图 13 L5和L8实验件在不同入射声压级下的声阻
Figure 13. Experimental results of acoustic resistance of L5 and L8 at different sound pressure level
图 14 L1～L3实验件在不同入射声压级下的声阻
Figure 14. Experimental results of acoustic resistance of L1～ L3 at different sound pressure level
图 15 L5～L7实验件在不同入射声压级下的声阻
Figure 15. Experimental results of acoustic resistance of L5～ L7 at different sound pressure level
图 16 振动的穿孔板表面粒子速度分布
Figure 16. Particle velocity distribution on the surface of the vibrating perforated plate
图 17 L1实验件穿孔板振动速度和小孔中空气振动速度幅值对比（LS = 152 dB）
Figure 17. Comparison of plate vibration velocity and air particles vibration velocity in holes of L1 at LS = 152 dB
图 18 L1实验件不同声压级下$\overline {{v_{\rm{p}}}}$和$\overline {{v_{\rm{a}}}}$的相位差
Figure 18. The phase difference of $\overline {{v_{\rm{p}}}}$ and $\overline {{v_{\rm{a}}}}$ at different sound pressure level of L1
表 1 声衬结构参数
Table 1. Summary of liner structure parameters
声衬编号 孔径d/mm 穿孔率σ/% 板厚t/mm 腔深D/mm L1 1 8.4 0.5 50 L2 1 8.4 0.8 50 L3 1 8.4 1.0 50 L4 1 19.6 1.0 50 L5 2 9.4 0.5 50 L6 2 9.4 0.8 50 L7 2 9.4 1.0 50 L8 2 19.6 0.5 50 L9 2 19.6 0.8 50 L10 2 19.6 1.0 50 
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