Inverse force determination is commonly used to determine input forces when they are not directly measurable. If transfer functions are measured with the source component attached, the inversely determined forces are, by definition, blocked forces. The primary advantage of using blocked forces is that the receiving structure may be modified and blocked forces, in theory, are unchanged. In this research, blocked forces are determined for a plastic engine cover connected to a base plate and a compressor attached to two different structures. At lower frequencies, blocked forces are determined using routine approaches where phase is included in both transfer function and operational response measurements. At high frequencies, it is demonstrated that predictions are improved if phase is ignored and blocked forces are assumed to be uncorrelated with respect to each other. It is also shown that the uncorrelated blocked forces are still valid even when changes are made to the receiving structure.
|Number of pages||12|
|Journal||Noise Control Engineering Journal|
|State||Published - Nov 2020|
Bibliographical noteFunding Information:
This research was supported by the Vibro-Acoustics Consortium at University of Kentucky.
© 2020 Institute of Noise Control Engineering. All rights reserved.
ASJC Scopus subject areas
- Building and Construction
- Automotive Engineering
- Aerospace Engineering
- Acoustics and Ultrasonics
- Mechanical Engineering
- Public Health, Environmental and Occupational Health
- Industrial and Manufacturing Engineering