### ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

## 4pSA8. Statistical measures of transfer functions in complex structures.

**Richard G. DeJong
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*Eng. Dept., Calvin College, Grand Rapids, MI 49546
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The frequency response function of structures can be modeled with pole-zero
functions or as modal summations. Either representation can be used to obtain
probability distributions for the magnitude of the frequency response functions.
These probabiltiy functions range from trigonometric functions for simple
structures to log-normal distributions for complex structures. Examples are
given for simulated and measured frequency response functions of beams, plates,
and vehicle structures. The statistical measures obtained from frequency
averages are similar to those obtained from ensemble averages in complex
structures. This suggests that a sufficiently complex structure can be
considered ergodic in the frequency domain.

All posters will be on display from 1:00 p.m. to 4:00 p.m. To allow
contributors an opportunity to see other posters, contributors of odd-numbered
papers will be at their posters from 1:00 p.m. to 2:30 p.m. and contributors of
even-numbered papers will be at their posters from 2:30 p.m. to 4:00 p.m. To
allow for extended viewing time, posters will remain on display until 8:00 a.m.
Friday morning.