Frequency and loss factor are two important indices of dynamic property of composite structures, in which the viscoelastic material is sandwiched between the upper layer and the lower layer.
频率和损耗因子是粘弹性材料复合夹层结构的两个重要的动力特性指标。
The speed of switching component is the primary factor that influences boosting frequency of inverter. Compared with IGBT, MOSFET can be used to improve dynamic responding speed.
开关管的开关速度是影响逆变焊机频率提高的主要因素，通过比较IGBT和MOSFET的优缺点，认为MOSFET焊机可以获得较好的动态响应速度。
The results show that, the natural frequency, dynamic amplification factor and acceleration root of mean square of seat suspension will decrease with the increase of proportional valve input voltage.
研究结果表明，座椅悬架的固有频率、位移传递率及加速度均方根值均随比例阀输入电压的增大而减小；
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