The bridge's dynamic features and train's running com fort under resonant speed of simply supported beams with equal spans are analyzed.

分析了等跨布置的铁路简支梁桥在共振速度下的动力特性，及车辆运行平稳性和稳定性。

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For simply and reliably improving the rotor's stability and suppressing the resonant vibration around the first critical speed, a new passive electromagnetic damper was proposed.

为了简单可靠地增加转子系统的稳定性、抑制转子的共振振峰，提出一种新型的被动式电磁阻尼器。

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As the increase of running time, the resonant frequency of ultrasonic motor will decrease, which then leads to the decrease of speed.

随着超声波电机运行时间的增加，其谐振频率会下降，进而使电机速度降低。

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