Hot Ground Vibration Tests

Metadata Updated: November 12, 2020

Ground vibration tests or modal surveys are routinely conducted to support flutter analysis for subsonic and supersonic vehicles. However, vibration testing techniques for hypersonic vehicles are not as well established due to the thermoelastic interactions that can occur when high-temperature materials are incorporated into a hot structure that contains metallic components.  The thermoelastic interaction between those materials can affect the hypersonic flutter analysis. In recent years, numerous high-temperature materials, new fabrication technologies, and sensors have been explored for hypersonic vehicle applications. This research team is working to develop a high-temperature modal survey to expand the research database for hypersonics and improve the understanding of such dual-material interactions.Work to date: NASA Armstrong directed a program to test a Carbon-Silicon Carbide (C/SiC) Ruddervator Subcomponent Test Article (RSTA) to support hypersonic material research. The RSTA has undergone numerous thermal, thermal-mechanical, and thermal-vibration tests. This research team conducted three modal surveys involving the RSTA to characterize the thermoelastic interaction of the hot-structure control surface. The team obtained good modal data at lower temperatures, but the off-the-shelf, high-temperature accelerometers malfunctioned on the hotter region of the test article. The experiments yielded test data that will be useful for future work and launched a high-temperature accelerometer development effort.Looking ahead: The research team has obtained custom-made and multiple other high-temperature accelerometers and are taking steps to understand, evaluate and characterize their complexity and functionality in preparation for future thermoelastic vibration tests.BenefitsInnovative: Expands the research database for hypersonics through high-temperature modal testingPioneering: Extends the understanding of the modal characteristics effects from high temperatures on hypersonic vehicle materialsAids research: Contributes to the understanding of flutter behavior at high temperaturesReduces risk: Will aid in the future design of hypersonic vehiclesApplicationsHypersonic vehicle research and design

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Publisher Space Technology Mission Directorate
Unique Identifier Unknown
Maintainer
Identifier TECHPORT_14673
Data First Published 2018-06-26
Data Last Modified 2020-01-29
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Homepage URL https://techport.nasa.gov/view/14673
Program Code 026:027
Source Datajson Identifier True
Source Hash 1d87db0cbc9db4f45717e82f5b87c43472154f99
Source Schema Version 1.1

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