Determination of Anelastic-Induced Error in Wind Tunnel Test Force and Moment Measurements

Abstract

MicroCraft Inc. performed a specialized calibration of the NASA Langley 104B balance (fabricated from CVM 200 alloy) in their Automatic Balance Calibration System (ABCS) machine to identify and determine the magnitude of anelastic effects in the calibration results. The results analyzed thus far are for the axial force gage. These results show that anelastic effects for the balance in question are substantial enough to consider revising calibration methodology for situations where highest accuracy is needed. Worst case effects found thus far are of the order of 0.1 percent balance gage capacity. Modeling of the anelastic relaxation process with time constants that are linear with stress level was successful in reducing the uncertainty by at least 50 percent.

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Document Details

Document Type
Technical Report
Publication Date
Jan 14, 1999
Accession Number
ADA370968

Entities

People

  • Dennis Booth
  • Frank W. Steinle Jr.
  • Ray D. Rhew

Organizations

  • American Institute of Aeronautics and Astronautics

Tags

Communities of Interest

  • Air Platforms
  • Sensors
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Aeronautics
  • Air Force
  • Aircrafts
  • Calibration
  • Equations
  • Gages
  • Load Cells
  • Materials
  • Measurement
  • Relaxation Time
  • Standards
  • Strain Gages
  • Time Intervals
  • United States
  • Wind Tunnel Tests
  • Wind Tunnels

Readers

  • Fluid Dynamics.
  • Mechanical Engineering/Mechanics of Materials.
  • Systems Analysis and Design