Logarithmic Decrement

Views Updated: Dec 15, 2025

Abbreviation

Pronunciation

/ləˈɡærɪðmɪk ˈdɛkrɪmənt/

The natural logarithm of this ratio is called the logarithmic decrement.
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.
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.
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.
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.

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