actran计算离心压气机噪声计算离心压气机噪声，使用mohring体声源计算，计算时遇到两个问题
第一个，定义无限源infinite acoustic时，计算报错The error was :Failed to gather speed of sound from neighbor component for infinite_acoustic 2 (the component does not touch any component from which speed of sound information can be extracted).可是我选择的无限源面确实是贴合morhing体声源的，共节点，怎么会获得不到声学信息呢？
第二个，计算mohring体声源时报错：The flow seems to be supersonic on some places. 就因为超音速了我才使用的mohring来计算而不是lighthill，结果因为速度过大报错
