Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observations of nonlinear eigen-states, localized versus non-imaging
  modal response of contact structures   In scientific inquiry of small scale energy and transition events, the effect
of an observer on the measurement can be substantial. Similarly, the methods of
observation can create entirely different understandings of the system
behavior, discussed here on a macro scale. An example using laser vibrometry
analysis of nonlinear clattering contact of armor plate shows the difference
between the common measurement-at-a-point compared to measuring the system
dynamics from the simultaneous behavior of the entire structure which can be
useful for remote identification of these ground and air vehicles. The former
pencil-thin laser technique fits the keep-it-simple maxim but hides crucial
coupling data. With careful observation methods it is possible to measure the
structural modal frequencies and calculate the transition probabilities between
these discrete modes. This work shows the genesis of what is sometimes called
1/f "noise" which is explained by Zienkiewicz and shown by analysis and
simulation herein - that the energy of the essentially discrete structural
vibration modes decreases with increasing mode number (and frequency).

18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph