no-load temperature drop test 无负荷降温试验
The results of the study show that cracks are not formed in the normal structure load, but abrupt temperature drop is the main reason for cracks formation.
研究结果表明：闸墩在正常的结构荷载作用下不会产生裂缝，温度骤降是产生裂缝的根本原因。
Because of the temperature rising of ultrasonic motors, load changes, and vicinal surrounding changes and so on, the resonant frequency will shift, leading to working stability drop.
由于超声波电机的温升、负载变化及周围环境变化等原因，使电机的谐振频率发生漂移，这将影响超声波电机运行的稳定性。
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