modulus of decay

modulus of decay

[¦mäj·ə·ləs əv di′kā]
(mechanics)
The time required for the amplitude of oscillation of an underdamped harmonic oscillator to drop to 1/ e of its initial value; the reciprocal of the damping factor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.