The natural logarithm of this ratio is called the logarithmic decrement. 此比率自然对数称为对数的减量。
The studies show that compared with the conventional logarithmic decrement method, this method need not to determine the baseline, and is insensitive to baseline drift and low frequency interference. 研究表明,与传统的对数衰减法相比,新方法无须确定基线,估计结果对基线漂移和低频干扰不敏感。
The important action of eigenvector in estimating stability margin is investigated, and the limitation of both system damping and logarithmic decrement criteria is pointed out. 探讨了特征向量在评估稳定性裕度的重要作用,指出了传统的对数衰减率(LD)与系统阻尼判据在评估轴承稳定性裕度时的局限性。
This method considers the whole time histories of vibration, which differs from the traditional damping ratio identification method in the time domain which uses merely the amplitude to calculate damping ratio, and overcomes the defect of the traditional logarithmic decrement method for high accuracy requirement of amplitude. 该方法考虑了完整的基础振动时程,不同于传统的时域阻尼比计算方法仅仅依据振幅的数值计算阻尼比,克服了传统对数衰减法对幅值测量精度要求很高的缺陷。
At present, for nonlinear bearing rotor system, people usually use the logarithmic decrement of its linear system as the stability rule of system, this has made a great difference of theory and experiment result. 目前对于非线性轴承转子系统,仍普遍采用其线性化系统的对数衰减率(LD)作为系统的稳定性判据,这造成了理论和实验结果相差较大。