Use the method of the frequency governor with machine speed. Bring about a stepless regulation of all constant power range, in the rotating main movement of universal machine tools.
用变频调速和机械变速相结合的方法，在主运动为旋转运动的通用机床中，实现全部恒功率范围内的无级调速。
This frequency range is proximate to main vibration frequency of the traction machine at rated speed, and, according to this, measures against elevator resonance are proposed.
并针对该频率区与曳引机主机额定转速———主振频率接近的特点，提出了防止电梯发生系统共振的措施。
Increase of detection range and fast precision tracking are main difficulties in weak aerial target detection for High Frequency Surface Wave Radar (HFSWR).
增大探测距离、快速精确跟踪是高频地波雷达探测飞行小目标所面临的主要困难。
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