skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Response of a store with tunable natural frequencies in compressible cavity flow

Abstract

Fluid–structure interactions that occur during aircraft internal store carriage were experimentally explored at Mach 0.58–1.47 using a generic, aerodynamic store installed in a rectangular cavity having a length-to-depth ratio of seven. The store vibrated in response to the cavity flow at its natural structural frequencies, and it exhibited a directionally dependent response to cavity resonance frequencies. Cavity tones excited the store in the streamwise and wall-normal directions consistently, whereas the spanwise response to cavity tones was much more limited. Increased surface area associated with tail fins raised vibration levels. The store had interchangeable components to vary its natural frequencies by about 10–300 Hz. By tuning natural frequencies, mode-matched cases were explored where a prominent cavity tone frequency matched a structural natural frequency of the store. Mode matching in the streamwise and wall-normal directions produced substantial increases in peak store vibrations, though the response of the store remained linear with dynamic pressure. Near mode-matched frequencies, changes in cavity tone frequencies of only 1% altered store peak vibrations by as much as a factor of two. In conclusion, mode matching in the spanwise direction did little to increase vibrations.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1325714
Report Number(s):
SAND-2015-6962J
Journal ID: ISSN 0001-1452; 599048
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
AIAA Journal
Additional Journal Information:
Journal Volume: 54; Journal Issue: 8; Journal ID: ISSN 0001-1452
Publisher:
AIAA
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Wagner, Justin L., Casper, Katya M., Beresh, Steven J., Hunter, Patrick S., Spillers, Russell W., and Henfling, John F. Response of a store with tunable natural frequencies in compressible cavity flow. United States: N. p., 2016. Web. doi:10.2514/1.J054688.
Wagner, Justin L., Casper, Katya M., Beresh, Steven J., Hunter, Patrick S., Spillers, Russell W., & Henfling, John F. Response of a store with tunable natural frequencies in compressible cavity flow. United States. doi:10.2514/1.J054688.
Wagner, Justin L., Casper, Katya M., Beresh, Steven J., Hunter, Patrick S., Spillers, Russell W., and Henfling, John F. Fri . "Response of a store with tunable natural frequencies in compressible cavity flow". United States. doi:10.2514/1.J054688. https://www.osti.gov/servlets/purl/1325714.
@article{osti_1325714,
title = {Response of a store with tunable natural frequencies in compressible cavity flow},
author = {Wagner, Justin L. and Casper, Katya M. and Beresh, Steven J. and Hunter, Patrick S. and Spillers, Russell W. and Henfling, John F.},
abstractNote = {Fluid–structure interactions that occur during aircraft internal store carriage were experimentally explored at Mach 0.58–1.47 using a generic, aerodynamic store installed in a rectangular cavity having a length-to-depth ratio of seven. The store vibrated in response to the cavity flow at its natural structural frequencies, and it exhibited a directionally dependent response to cavity resonance frequencies. Cavity tones excited the store in the streamwise and wall-normal directions consistently, whereas the spanwise response to cavity tones was much more limited. Increased surface area associated with tail fins raised vibration levels. The store had interchangeable components to vary its natural frequencies by about 10–300 Hz. By tuning natural frequencies, mode-matched cases were explored where a prominent cavity tone frequency matched a structural natural frequency of the store. Mode matching in the streamwise and wall-normal directions produced substantial increases in peak store vibrations, though the response of the store remained linear with dynamic pressure. Near mode-matched frequencies, changes in cavity tone frequencies of only 1% altered store peak vibrations by as much as a factor of two. In conclusion, mode matching in the spanwise direction did little to increase vibrations.},
doi = {10.2514/1.J054688},
journal = {AIAA Journal},
number = 8,
volume = 54,
place = {United States},
year = {2016},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Save / Share: