When designing FDF system of compact spinning, the negative pressure drops resulting from spindles at the front and back of the machine should be kept within allowance.
在紧密纺大风机系统设计中，车头、车尾各锭的负压差异要保持在允许误差范围之内。
2
The criterion for judging flow reversals can be obtained through FDF theory.
而FDF理论分析可得出一个壁面（冷壁）或两个壁面均出现倒流的判断准则。
3
The simulation results illustrate that the FDF detected the faults occurred in different sensors effectively.