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在振动中有二种应用尺度:一种是线性的;另一种是对数的。线性尺度使用简便,意义直截了当。它是一个测量值与另外一个值之比,无须再加研究,例如,1/2值就是被测值的一半,或在记录上表示一半峰值。可是当应用对数尺度时,这种显而易见的线性就失去了。从另一方面来看,对数尺度能够使变化大的数值缩小它的表示范围,从信噪比观点来看这往往表现得更好些。对数尺度与均衡值一起能够改善信噪比,这意味着能够容易地探测出对应于测量系统基本噪声(电噪声)的低值信号。
There are two kinds of application scales in vibration: one is linear and the other is logarithmic. The use of linear scales is simple and straightforward. It is the ratio of one measurement to another, without further study. For example, 1/2 is half the measured value or half the peak on the record. But when the logarithmic scale is applied, this obvious linearity is lost. On the other hand, the logarithmic scale can make a large number of changes narrow its representation range, which tends to perform better from a signal-to-noise point of view. The logarithmic scale together with the equalization value improves the signal-to-noise ratio, which means that low-level signals corresponding to the basic noise (electrical noise) of the measurement system can easily be detected.