As the natural sampling method generating SPWM pulses closer to sine wave is impractical in real-time control, the regular sampling method with poor precision is usually adopted in practical projects.
自然采样法产生的SPWM脉冲效果最接近正弦波，但工程中不利于实时控制，在实际中常采用的规则采样法精度不够高。
After studied the natural gas flow speed, density and helicity in the spiral and sine flow channel, the effects of natural gas to the bending tubing was obtained.
通过对天然气在螺旋弯曲和正弦弯曲流道内的流动速度、密度和螺旋度进行研究，得到天然气对弯曲油管的作用力。
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