Panel Damping Loss Factor Estimation Using the Random Decrement Technique

ANEL damping loss factors can be computed using a number of techniques based on measured responses and, depending on the algorithm chosen, based on measured excitation forces as well. These many techniques are based on a range of mathematical models, including both continuous and discretized formulations. Here, a single degree of freedom model and a linear finite element-based model of a free, uniform thin plate are used to simulate the measurements needed for the Random Decrement Technique (RDT). In particular, the computational models are given a range of structural damping levels; then, the estimation techniques are used to “recover” the given level of damping. Presumably, if the validation is positive, the technique will be considered a valid process for measurements on actual structures. Comparisons with the Impulse Response Decay Method (IRDM) have been conducted using three damped plates. P