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高速面铣刀气动噪声由离散噪声与对总噪声影响较大的宽带噪声组成.针对高速面铣刀流场和声场的非定常特点,采用计算流体动力学(computational fluid dynamics,CFD)方法对面铣刀周围气流特性进行数值模拟,分析铣刀容屑槽区域的速度分布.计算线性欧拉方程(linear euler equation,LEE)中的声源项确定铣刀表面声源位置及强度.通过应用基于Lighthill声学类比的Ffowcs Williams-Hawkings(FW-H)积分变换方程计算获得远场噪声.针对铣刀表面不同声源产生的气动噪声频谱进行分析,发现铣刀容屑槽及刀片前刀面是高速面铣刀气动噪声的主要声源.等距及不等距铣刀噪声频谱分析表明不等齿距布置可改变频谱声能分布,降低离散噪声的基频峰值,进而可降低铣刀气动总噪声.
The aerodynamic noise of high-speed face milling cutter consists of discrete noise and wide-band noise, which has a great influence on the total noise.According to the unsteady characteristics of flow field and sound field of high-speed face cutter, CFD The numerical simulation of the airflow characteristics around the knife was used to analyze the velocity distribution in the chip flute area of the milling cutter.The sound source in the linear euler equation (LEE) was calculated to determine the position and intensity of the sound source on the cutter surface.Through the application of Lighthill Far-field noise was calculated by the Ffowcs Williams-Hawkings (FW-H) integral transformation equation of acoustic analogy.Analysis of the aerodynamic noise spectrum generated by different sound sources on the milling cutter surface showed that the milling chip flute and the rake face of the blade were high-speed surface The main source of pneumatic noise of milling cutter noise spectrum analysis of isometric and unequal milling cutter shows that the arrangement of unequal pitch can change the spectral sound energy distribution and reduce the fundamental frequency peak of discrete noise, which can reduce the total aerodynamic noise of milling cutter.