论文部分内容阅读
有限元法(FEM)适合低频分析,统计能量分析(SEA)方法适合高频分析,而一类较宽频带(中频段)的声振响应问题不适合单独用FEM或SEA方法解决。基于波动耦合的混合FE-SEA方法兼顾了FEM与SEA方法的优点,可预测中频段含一定不确定性的声振系统的稳态响应。本文阐释了混合FE-SEA方法的理论,分别通过典型结构的蒙特卡罗仿真与复杂系统的噪声试验两案例对该方法进行了验证,其中梁-板典型结构能量响应计算值与蒙特卡罗仿真值具有较好的一致性;复杂飞行器系统的振动响应与试验结果较为吻合,舱内噪声声压级(SPL)误差小于3dB,证明了混合FESEA方法的有效性,解决了FEM与SEA方法在中频复杂声振响应中的局限性这一问题。
The finite element method (FEM) is suitable for low-frequency analysis, and the statistical energy analysis (SEA) method is suitable for high-frequency analysis. However, the acoustic vibration problem of a wider band (mid-frequency band) is not suitable for solving by FEM or SEA alone. The hybrid FE-SEA method based on wave coupling combines the advantages of FEM and SEA methods and predicts the steady-state response of the vibration system with some uncertainties in the middle frequency range. In this paper, the theory of hybrid FE-SEA method is illustrated. The method is validated by Monte Carlo simulation of typical structure and noise test of complex system respectively. The calculated values of energy response of typical structure of beam-plate and Monte Carlo simulation The vibration response of the complex aircraft system is in good agreement with the experimental results. The noise floor noise level (SPL) error is less than 3 dB, which proves the effectiveness of the hybrid FESEA method and solves the problem that the FEM and SEA methods operate at intermediate frequencies The problem of the limitations in complex acoustic vibration response.