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Experimental Mechanics

, Volume 21, Issue 11, pp 401–407 | Cite as

Six-component strain-gage balances for large wind tunnels

This paper concerns the design, equipment, thermal-effects compensation and calibration of various multicomponent strain-gage balances used in the large subsonic and supersonic ONERA wind tunnels in France
  • Maurice Dubois
Article

Abstract

ONERA, the French Aerospace Research Institute, currently design, manufacture and calibrate the many dynamometers and balances, measuring one or several components, necessary for the tests in the large wind tunnels and other installations of its Modane-Avrieux and Le Fauga-Mauzac Centers, as well as those requested by external organizations, in France or abroad.

The number of dynamometric sensors realized since 1955 amounts to several hundreds. Their capacities range from 0.01 N to 1000 kN. Their precision is usually about 10−3, but may reach 10−4.

This paper describes the problems concerning the metallic architecture of the multicomponent balances, their strain-gage and electric equipment, thermal effects and their compensation it presents the general principles and the means used for the calibration of these balances.

Keywords

Mechanical Engineer Fluid Dynamics Thermal Effect Wind Tunnel General Principle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

A,a

linear-sensitivity coefficients

B,b

quadratic-sensitivity coefficients

d

dynamometric sensitivity

E

Young’s modulus

k

gage factor

R

electric resistance

TCD

thermal coefficient of sensitivity

TCE

thermoelastic coefficient of support

TCK

thermal coefficient of gage factork

X

force component

θ

temperature

σ

bridge signal

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References

  1. 1.
    Pierre, M. and Fasso, G., “The Aerothermodynamic Test Center of Modane-Avrieux,” ONERA Technical Note No. 166 (1970) — Also in French and German.Google Scholar
  2. 2.
    Pierre, M., ONERA (“The Pressurized Subsonic Wind Tunnel FI of ONERA”), L’Aéronautique et l’Astronautique No. 48, (1974–75).Google Scholar
  3. 3.
    Christophe, J., “Modane, (Experimental Techniques Used for the Tests of Concorde Models in the Modane Wind Tunnels),” unpublished, but available as ONERA T.P. n o 191 (1964).Google Scholar
  4. 4.
    Masson, A., “Modane-Avrieux, (Propeller Tests in the Large Sonic Wind Tunnel of Modane-Avrieux),” ONERA T.N. No. 161, (1970).Google Scholar
  5. 5.
    Schweisch, A., “Modane-Avrieux (Facility for Helicopter Rotor Tests in the Large Wind Tunnel of Modane-Avrieux),” in “Fluid Dynamics of Rotor and Fan Supported Aircraft at Subsonic Speeds,” AGARD Conf. Proc. No. CP-22, (1967).Google Scholar
  6. 6.
    Fasso, G., Pletin, M. and Broussaud, P., “Flux, (Installation for the Study of Multiple Flux Engine Nozzles),” ONERA T.N. No. 160, (1970).Google Scholar
  7. 7.
    Daniel, M. and Pletin, M., “Fusées, (Simulation of Rocket Stage Separation),” Rech. Aerosp. No. 107, (1965).Google Scholar
  8. 8.
    Broussaud, P., “Modane-Avrieux (Balances and Dynamometers Used in the Modane-Avrieux Test Center),” ONERA T.N. No. 122, (1968).Google Scholar
  9. 9.
    Dubois, M., “Design and Manufacture of High Precision Strain Gauge Dynamometers and Balances at the ONERA Modane Centre,” Strain, 188–194 (Oct. 1974). Also, in French in MESURES (Juin 1974).Google Scholar
  10. 10.
    Christophe, J., “Reynolds, (Genesis of the Project of the High-Reynolds European Transonic Wind Tunnel),” L’Aéronautique et L’Astronautique n o 72, 21–34 (1978–5).Google Scholar
  11. 11.
    Bazin, M. and Dubois, M., “Balance and Sting Design for Cyrogenic Wind Tunnels,” Southampton (April 1979), available as ONERA T.P. 1979–40. Google Scholar
  12. 12.
    Dubois, M., “Experimental Study of Strain Gauge High Precision Dynamometers at the ONERA Modane Test Centre,” IMEKO Meeting, the Hague, Sept. 1971-VDI Berichte, No. 176 (1972).Google Scholar
  13. 13.
    Hansen, R.M., “Mechanical Design and Fabrication of Strain Gage Balances,” AGARD Report No. 9 (Feb. 1956).Google Scholar
  14. 14.
    Pollock, N., “The Optimum Design of Strain Gauge Sting Balances for Wind Tunnel Models,” Aerodynamics Report 133, Department of Supply - Melbourne, (March 1969).Google Scholar
  15. 15.
    Tracy, R.R., “Wind Tunnel Sting Balances,” Strain Gage Readings,V (6),1963Stein Engineering Service, Phoenix (Arizona).Google Scholar
  16. 16.
    Dubois, M., “Mechanical Links during the Use of Dynamometers,” Measures (April 1974).Google Scholar
  17. 18.
    Stein, P.K., “Transducers in Temperature Gradient/Transient Environments,” IMEKO Meeting, Braunschweig, Sept. 1978 — VDI Berichte No. 312, 29–35 (1978).Google Scholar
  18. 19.
    Dubois, M., “Measurement of the Thermoelastic Coefficient of Metals by Strain Gauges,” Strain, 22–31 (Jan. 1978).Google Scholar
  19. 20.
    Dubois, M., “Modane (Survey of the Problems Raised by the Improvements of the Balances used in the Modane Wind Tunnels),” unpublished ONERA Note (Jan. 1975).Google Scholar
  20. 21.
    Hansen, R.M., “Evaluation and Calibration of Wire Strain-Gage Wind Tunnel Balance under Load,” AGARD Report No. 13 (1956).Google Scholar
  21. 22.
    Dubois, M., “Calibration of Six Components Dynamometric Balances,” Proceedings of the Round-Table Discussion on Measurement of Force and Mass, 7th IMEKO Meeting, London (May 1976).Google Scholar
  22. 23.
    Dubois, M., “Bancs (Description of the Dynamometric Calibration Bench and of the Multicomponent Force Standard, Intended for Comparisons Between Benches),” Bulletin BNM No. 34, 36–47 (Oct. 1978).Google Scholar
  23. 24.
    Dubois, M., “Progress in the Precision of the 250kN ONERA Force Standard Machine,” IMEKO Meeting, Braunschweig, Sept. 1979 —VDI Berichte No. 312, 85–93 (1978).Google Scholar
  24. 25.
    Dubois, M., “Modane-Avrieux (Description of a New Installation for Calibrating Aerodynamic Balances at the Modane-Avrieux Test Center),” Rech. Aéron. No. 92 (1963). English version: ARA Library Translation No. 5 (Nov. 1963).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1981

Authors and Affiliations

  • Maurice Dubois
    • 1
  1. 1.Office National d’Etudes et de Recherches Aerospatiales (ONERA)Modane-Avrieux Test/CenterFrance

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