船用离心风机壳体振动噪声优化研究

当风机进出口连接长管道时,其外部辐射噪声主要是内部非定常流动诱发蜗壳振动产生的振动噪声。风机壳体的振动噪声是典型的流固干涉噪声,通常基于非定常流场获得振动激励源。为了控制此类噪声,通过振动噪声数值计算方法,并结合试验设计方法(Design of Experiment, DOE),给出了一种以壳体各板块厚度(前板TF,侧板TS,后板TB)为设计变量、以壳体振动辐射声功率为目标函数的单目标优化方法。研究表明,当保持壳体质量不变时,优化后,壳体表面辐射声功率均有不同程度降低,壳体表面基频辐射声功率降幅最大,达到6.23 dB。

Research on the vibro-acoustic coupling optimization of marine centrifugal fan volute casing

When the inlet and outlet of fan system is connected with long pipelines, the structural vibration noise is the main component of the external radiated noise. In fact, the fan casing noise induced by unsteady flow is a typical fluid-solid coupling noise, and the vibration source is usually obtained by the unsteady flow field. To control the vibration noise of fan volute casing, a vibration noise optimization control method based on the Design of Experiment (DOE) method is proposed, the thicknesses of the volute walls, including front-wall thickness-T_F, side-wall thickness-T_S, and back-wall thickness-T_B, are taken as design variables, and the acoustic power on the volute surface is taken as the optimal objective function. The study shows that when the volute total mass remains constant, the radiated sound power on the surface of volute can be reduced to some extent after optimization, and the maximum reduction of 6.23 dB appears at the fundamental frequency.