基于PE算法的管道噪声声传播预测技术

Prediction of Propagation of Pipeline Noise Based on Parabolic Equation Algorithm

本文针对风扇外涵道声传播数值预测问题,基于PE方法,开发了声阻抗边界条件模型。针对二维与三维的声传播问题、多种声学边界模型,应用有限差分法进行离散,采用四阶龙格库塔法进行推进,开发了管道噪声声传播预测软件。标模算例验证结果表明,此软件与传统声学有限元软件相比,可以有效缩短风扇外涵道声传播数值预测时间,其既能保证足够的预测精度,又提高了计算效率。

In this paper, based on the PE method, the acoustic impedance boundary condition model is developed for the numerical prediction of the noise propagation in the duct outside the fan. Aiming at the two-dimensional and three-dimensional sound propagation problems and various acoustic boundary models, the finite difference method is used for discretization, and the fourth-order Runge-Kutta method is used for advancement, and the pipeline noise sound propagation prediction software is developed. The verification results of the standard model calculation example show that compared with the traditional acoustic finite element software, this software can effectively shorten the numerical prediction time of the ducted sound propagation outside the fan. It can not only ensure sufficient prediction accuracy, but also improve the calculation efficiency.