A modal test of a space-truss for structural parameter identification
- Sandia National Labs., Albuquerque, NM (United States)
- Jet Propulsion Lab., Pasadena, CA (United States)
The Jet Propulsion Laboratory is developing a large space-truss to support a micro-precision interferometer. A finite element model will be used to design and place passive and active elements in the truss to suppress vibration. To improve the model's predictive capability, it is desirable to identify uncertain structural parameters in the model by utilizing experimental modal data. Testing of both the components and the system was performed to obtain the data necessary to identify the structural parameters. Extracting a modal model, absent of bias errors, from measured data requires great care in test design and implementation. Testing procedures that are discussed include: verification of non-constraining shaker attachment, quantification of the non-linear structural response, and the design and effects of suspension systems used to simulate a free structure. In addition to these procedures, the accuracy of the measured frequency response functions are evaluated by comparing functions measured with random excitation, using various frequency resolutions, and with step sine excitation.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6835091
- Report Number(s):
- SAND-92-2367C; CONF-930241-1; ON: DE93004043
- Resource Relation:
- Conference: 11. international modal analysis conference, Kissimmee, FL (United States), 1-4 Feb 1993
- Country of Publication:
- United States
- Language:
- English
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FINITE ELEMENT METHOD
MATERIALS TESTING
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