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Title: Characterizing Dynamic Test Fixtures Through the Modal Projection Error.

Abstract

Across many industries and engineering disciplines, physical components and systems of components are designed and deployed into their environment of intended use. It is the desire of the design agency to be able to predict whether their component or system will survive its physical environment or if it will fail due to mechanical stresses. One method to determine if the component will survive the environment is to expose the component to a simulation of the environment in a laboratory. One difficulty in doing this is that the component may not have the same boundary condition in the laboratory as is in the field configuration. This paper presents a novel method of quantifying the error in the modal domain that occurs from the impedance difference between the laboratory test fixture and the next level of assembly in the field configuration. The error is calculated from the projection from one mode shape space to the other, and the error is in terms of each mode of the field configuration. This provides insight into the effectiveness of the test fixture with respect to the ability to recreate the mode shapes of the field configuration. A case study is presented to show that themore » error in the modal projection between two configurations is a lower limit for the error that can be achieved by a laboratory test.« less

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1599276
Report Number(s):
SAND2020-1119
683639
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Schoenherr, Tyler Franklin, Rouse, Jerry W., and Harvie, Julie. Characterizing Dynamic Test Fixtures Through the Modal Projection Error.. United States: N. p., 2020. Web. doi:10.2172/1599276.
Schoenherr, Tyler Franklin, Rouse, Jerry W., & Harvie, Julie. Characterizing Dynamic Test Fixtures Through the Modal Projection Error.. United States. doi:10.2172/1599276.
Schoenherr, Tyler Franklin, Rouse, Jerry W., and Harvie, Julie. Wed . "Characterizing Dynamic Test Fixtures Through the Modal Projection Error.". United States. doi:10.2172/1599276. https://www.osti.gov/servlets/purl/1599276.
@article{osti_1599276,
title = {Characterizing Dynamic Test Fixtures Through the Modal Projection Error.},
author = {Schoenherr, Tyler Franklin and Rouse, Jerry W. and Harvie, Julie},
abstractNote = {Across many industries and engineering disciplines, physical components and systems of components are designed and deployed into their environment of intended use. It is the desire of the design agency to be able to predict whether their component or system will survive its physical environment or if it will fail due to mechanical stresses. One method to determine if the component will survive the environment is to expose the component to a simulation of the environment in a laboratory. One difficulty in doing this is that the component may not have the same boundary condition in the laboratory as is in the field configuration. This paper presents a novel method of quantifying the error in the modal domain that occurs from the impedance difference between the laboratory test fixture and the next level of assembly in the field configuration. The error is calculated from the projection from one mode shape space to the other, and the error is in terms of each mode of the field configuration. This provides insight into the effectiveness of the test fixture with respect to the ability to recreate the mode shapes of the field configuration. A case study is presented to show that the error in the modal projection between two configurations is a lower limit for the error that can be achieved by a laboratory test.},
doi = {10.2172/1599276},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {1}
}