This rate of change of momentum of the air is allowed for by apparent mass components, the magnitudes of which must be determined experimentally.
空气动量的变化率可用表观质量分量描述，这些分量的大小必须通过实验来确定。
The calculation models of the effective area, the rate of change of the effective area and the rate of change of the effective volume are established for the diaphragm air spring.
在膜式空气弹簧结构与计算模型的基础上，建立起膜式空气弹簧有效面积、有效面积的变化率及有效体积变化率的计算模型。
Regardless of hysteresis of air system, the main factor that influences dynamic response of fuel cell is diffusion concentration polarization, which restricts the change rate of stack current.
不考虑空气系统的时间滞后，影响电池动态响应时间的主要因素为扩散浓差极化，它限制了电流的变化率。
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