针对超低空空投拉平阶段由航空发动机的噪声引起的非线性PIO (驾驶员诱发振荡)的问题，采用环形局域共振膜结构模型进行减振降噪。结合有限元法和仿真实验对环形弹性膜结构带隙生成机理、带隙宽度影响因素及隔声特性进行分析。仿真实验结果显示：带隙是由共振单元与弹性波耦合的结果，耦合强度直接影响共振频率和带隙宽度；带隙宽度和共振频率受薄膜尺寸和表面面密度的影响，即内环半径越大，表面面密度越大，带隙越宽，共振频率越高；隔声量取决于薄膜面密度、圆环面密度及中心质量环的位置。所得结果：通过优化结构参数，使其在低频范围具有良好的隔振效果，有效的抑制振荡，显著改善飞行品质。
Aiming at the nonlinear PIO problem caused by Aero-engine noise during ultra-low-altitude airdrop process, a circular membrane-ring structure mode local resonance mechanism resonators was applied to reduce noise and vibration. The analysis of band gap formation mechanisms , the width of band gap affect factors, and sound insulation quantities by theoretical analysis and simulation test. The simulation test results show that the locally resonant band gap is the consequence of the local resonances and the traveling wave modes interactions. The coupling strength affect bandwidth and sound insulation effect directly,which depends on thin membrane size and surface density, so the greater the radius of inner and the surface density, the wider band-gap, the higher the resonant frequency; sound Insulation depends on the thin membrane surface density,the circular surface density and the position of center ring. This research result that the structure has a good sound insulation of characteristics by optimizing structure parameters, which suppress vibration and improve flying qualities of transport effectively.
参考文献
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