So the minimal uncontrolled roof-fall span, displacementAngle and caving Angle are studied by similarity simulation.
借助相似模拟试验，研究了顶板自然垮落的最小跨度、移动角和垮落角。
2
In the second one, the input current displacementAngle is dynamically modulated as a function of positive-and negative-sequence components of the input voltages.
第二种控制策略中，输入电流矢量根据输入电压正、负序成分进行动态调制。
3
With mining depth increasing continuously in our country, in condition of mining in the deep-lying, there are many problems in determining displacementAngle of stratum at present.