vfd的音标

the numerical results show that the scheme is correct and feasible, and that the vfd life is characterized by lognormal distribution, the accelerated model meets arrhenius equation. accurate calculation of the acceleration parameters enables rapid estimation of vfd life.

数值结果表明，该试验方案是正确可行的，VFD的寿命服从对数正态分布，其加速模型符合阿伦尼斯方程，加速参数的精确计算使得快速估算VFD的寿命成为可能。

Finally, finite element and dynamic substructure method for VFD model are applied to dynamic response calculation of SMR. Power spectrum density of SMR grain response is obtained under random excitation of trapezium acceleration power spectrum density.

将VFD模型有限元法和模态综合法用于发动机响应计算，得到了梯形谱随机激振作用下发动机药柱响应的功率谱密度，它集中在一个窄带频域内，形成共振尖峰。

Vibration test of pole-shaped grain is conducted under various frequencies. The experiment results of acceleration frequency response is in agreement with theoretical data, which shows VFD model can also be used in SMR frequency domain analysis.

同时，杆状药柱在不同频率下简谐振动试验的加速度频响函数与VFD理论分析结果比较接近，说明这种模型也可以用于药柱的频域响应分析。