利用反演技术求解消声器内部结构参数

Computational Inverse Technique for Structure Parameters Characterization of Muffler

应用流体动力学理论研究消声器内部流场,建立消声器有限元模型,确定给定结构参数求解出口气流流速的正问题;在正问题基础上,将出口气流速度作为消声器结构参数变化时的响应,运用反演技术求解消声器内部结构参数,并将反演问题转化为最优问题,采用遗传算法和梯度法相结合的混合优化算法进行优化,得到了较理想的仿真实验结果,验证了反演技术应用于消声器设计的可行性。

A computational fluid dynamic （CFD） numerical method is used to research the flow field and pressure field within the muffler manifold. A finite element model of the muffler is established to found the forward solver which calculates the dynamic outlet velocity response for given structure parameters varying continuously along the axial direction. Using the dynamic outlet velocity response as input data, the inner structure parameters of the muffler is determined by using a computational inverse technique which is based on the forward solver. By constructing an objective function,the inverse problem is thereby reduced to an optimization problem and a combined algorithm is employed. Examples are presented to demonstrate this inverse technique for parameters characterization of muffler. It is found that the present in-verse procedure is very robust for determining the structure parameters of muffler.