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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This paper analyzes the modal of Y7125 gear grinder spindle, gets out the main four stages of spindle vibration frequency and deals with the data.

基于有限元方法，对Y7125型磨齿机的砂轮主轴进行模态分析，得出了四阶主振动频率，并对数据进行了处理。

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The safety of a main well headframe would be reduced significantly, due to increased loading capacity and higher vibration frequency in a coalmine.

由于煤矿主井井架提升能力的增加，引起井架杆件受力增大，受迫振动频率增大，导致安全性能降低。

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