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Balancing Impedance and Controllability in Response Reconstruction with $$\mathrm{TS-IMMAT}$$

Journal Article · · Experimental Techniques
 [1];  [2];  [2];  [3];  [3];  [4]
  1. University of Wisconsin, Madison, WI (United States)
  2. Brigham Young University, Provo, UT (United States)
  3. Honeywell Federal, Manufacturing & Technologies, Kansas City, MO (United States)
  4. Mayes Consulting, Albuquerque, NM (United States)
+ Show Author Affiliations

In a prior work the authors proposed a variant on the Impedance Matched Multi-Axis Test (IMMAT) in which a fixture is defined, called the Transmission Simulator (TS), and the desired environment is matched at a set of sensors on the TS. If the motion of the TS is matched then the response of the rest of the component will also match, provided that the attached component has the same dynamics as it did when the environment was measured. Hence, one would like the TS to be flexible so that it reproduces the boundary conditions that the component of interest experiences during flight, but the more flexible the TS, the more shakers might be needed to control its response. This work presents a derivation that gives expressions for these two potential error sources in TS-IMMAT. Then, various case studies are presented, both on simulated and real hardware, to understand the importance of each error term in practical testing. The theory explains the phenomena that were observed when using measurements from a component that flew on a sounding rocket. The environmental response was measured and then various fixtures were attached, each comprising more of the next assembly, or the hardware to which the component was attached in flight. MIMO testing was repeated with each fixture and the results were compared to seek to understand the role of the impedance match in this type of testing. Here the results show that the number of modes that are active in the transmission simulator is also very important, and so the best solution balances these two considerations. An improved method of simulating the MIMO test is then proposed, so simulations can be used to predict what fixture, or transmission simulator, will give the best results in a TS-IMMAT test.

Research Organization:
Kansas City Nuclear Security Campus (KCNSC), Kansas City, MO (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002839
OSTI ID:
1969019
Report Number(s):
NSC-614-4782
Journal Information:
Experimental Techniques, Journal Name: Experimental Techniques Vol. 48; ISSN 0732-8818
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (18)

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book October 2021
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Shaker-structure interaction modeling and analysis for nonlinear force appropriation testing journal January 2022

Figures / Tables (24)

Figure 1(p. 2)figure Figure 1
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Table 1(p. 10)table Table 1
Figure 6(p. 11)figure Figure 6
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Table 2(p. 12)table Table 2
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Figure 11(p. 16)figure Figure 11
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Table 3(p. 17)table Table 3
Figure 14(p. 19)figure Figure 14
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Figure 16(p. 21)figure Figure 16
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Table 6(p. 24)table Table 6

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Related Subjects

42 ENGINEERING
force reconstruction
operational vibration environment
shaker test
substructuring