以下为句子列表：
英文: A fault diagnosis mothed for hydro-generator units has been put forward according to their vibration frequency spectrum characteristics.
中文: 摘要针对水轮发电机组振动的频谱特点，提出了基于小波包分析的水轮发电机组振动的故障诊断方法。
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英文: A novel technique has been developed to diagnose the operating faults of the dry screw vacuum pump by monitoring the vibration and by analyzing spectrum of vibration frequency and the time domain waveform.
中文: 摘要针对干式螺杆真空泵的运行故障，采用振动监测的方法，利用时域波形和频谱分析技术进行故障诊断。
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英文: At the same time, the dependency of the vibration frequency on the Coulomb bound potential and magnetic field is discussed.
中文: 同时也讨论了振动频率与库仑束缚势、磁场之间的变化关系。
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英文: By using a numerical method, the effect of changing in magnetic field upon vibration frequency and coefficient of reduction is presented.
中文: 最后给出数值结果，表明磁场的变化对振动频率及衰减系数的影响。
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英文: In calculation of dynamical character of supporting structure in the powerhouse of hydropower station, the simulation range is larger and the value of the natural vibration frequency is less.
中文: 摘要对于水电站机组支承结构而言，模拟範围愈大，计算出的自振频率愈低。
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