• 1. rated frequency range: 额定频率范围 | 额定输入频率范围 | 额外频率规模
• 2. rated frequency range of loudspeaker: 扬声器额定频率范围

• 1.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。
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