Strain Gage Loads Calibration Testing Of The Active Aeroelastic Wing F A 18 Aircraft
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Author | : |
Publisher | : |
Total Pages | : 20 |
Release | : 2002 |
Genre | : Airplanes |
ISBN | : |
Download Strain Gage Loads Calibration Testing of the Active Aeroelastic Wing F/A-18 Aircraft Book in PDF, Epub and Kindle
This report describes strain-gage calibration loading through the application of known loads of the Active Aeroelastic Wing F/A-18 airplane. The primary goal of this test is to produce a database suitable for deriving load equations for left and right wing root and fold shear; bending moment; torque; and all eight wing control-surface hinge moments. A secondary goal is to produce a database of wing deflections mesured by string potentiometers and the onboard flight deflection measurement system. Another goal is to produce strain-gage data through both the laboratory data acquisition system and the onboard aircraft data system as a check of the aircraft system. Thirty-two hydraulic jacks have applied loads through whiffletrees to 104 tension-compression load pads bonded to the lower wing surfaces. The load pads covered approximately 60 percent of the lower wing surface.
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 32 |
Release | : 2018-06-20 |
Genre | : |
ISBN | : 9781721510016 |
Download Strain Gage Loads Calibration Testing of the Active Aeroelastic Wing F/a-18 Aircraft Book in PDF, Epub and Kindle
This report describes strain-gage calibration loading through the application of known loads of the Active Aeroelastic Wing F/A-18 airplane. The primary goal of this test is to produce a database suitable for deriving load equations for left and right wing root and fold shear; bending moment; torque; and all eight wing control-surface hinge moments. A secondary goal is to produce a database of wing deflections measured by string potentiometers and the onboard flight deflection measurement system. Another goal is to produce strain-gage data through both the laboratory data acquisition system and the onboard aircraft data system as a check of the aircraft system. Thirty-two hydraulic jacks have applied loads through whiffletrees to 104 tension-compression load pads bonded to the lower wing surfaces. The load pads covered approximately 60 percent of the lower wing surface. A series of 72 load cases has been performed, including single-point, double-point, and distributed load cases. Applied loads have reached 70 percent of the flight limit load. Maximum wingtip deflection has reached nearly 16 in. Lokos, William A. and Olney, Candida D. and Chen, Tony and Crawford, Natalie D. and Stauf, Rick and Reichenbach, Eric Y. and Bessette, Denis (Technical Monitor) Armstrong Flight Research Center NASA/TM-2002-210726, NAS 1.15:210726, H-2490
Author | : William A. Lokos |
Publisher | : |
Total Pages | : |
Release | : 2002 |
Genre | : |
ISBN | : |
Download Strain-gage Loads Calibration Testing of the Active Aeroelastic Wing F/a-18 Airplane Book in PDF, Epub and Kindle
Author | : National Aeronautics and Space Adm Nasa |
Publisher | : Independently Published |
Total Pages | : 28 |
Release | : 2018-09-14 |
Genre | : Science |
ISBN | : 9781723718212 |
Download Deflection-Based Structural Loads Estimation from the Active Aeroelastic Wing F/A-18 Aircraft Book in PDF, Epub and Kindle
Traditional techniques in structural load measurement entail the correlation of a known load with strain-gage output from the individual components of a structure or machine. The use of strain gages has proved successful and is considered the standard approach for load measurement. However, remotely measuring aerodynamic loads using deflection measurement systems to determine aeroelastic deformation as a substitute to strain gages may yield lower testing costs while improving aircraft performance through reduced instrumentation weight. This technique was examined using a reliable strain and structural deformation measurement system. The objective of this study was to explore the utility of a deflection-based load estimation, using the active aeroelastic wing F/A-18 aircraft. Calibration data from ground tests performed on the aircraft were used to derive left wing-root and wing-fold bending-moment and torque load equations based on strain gages, however, for this study, point deflections were used to derive deflection-based load equations. Comparisons between the strain-gage and deflection-based methods are presented. Flight data from the phase-1 active aeroelastic wing flight program were used to validate the deflection-based load estimation method. Flight validation revealed a strong bending-moment correlation and slightly weaker torque correlation. Development of current techniques, and future studies are discussed.Lizotte, Andrew M. and Lokos, William A.Armstrong Flight Research CenterAEROELASTICITY; DEFLECTION; WINGS; F-18 AIRCRAFT; AERODYNAMIC LOADS; BENDING MOMENTS; FEASIBILITY ANALYSIS; STRAIN GAGES; CIRCUITS; POTENTIOMETERS (INSTRUMENTS); WING ROOTS; ROOT-MEAN-SQUARE ERRORS; GROUND TESTS
Author | : T. H. Skopinski |
Publisher | : |
Total Pages | : 80 |
Release | : 1953 |
Genre | : Aerodynamic load |
ISBN | : |
Download Calibration of Strain-gage Installations in Aircraft Structures for the Measurement of Flight Loads Book in PDF, Epub and Kindle
A general method has been developed for calibrating strain-gage installations in aircraft structures, which permits the measurement in flight of the shear of lift, the bending moment, and the torque or pitching moment on the principle lifting or control surfaces. Although the stress in structural members may not be a simple function of the three loads of interest, a straightforward procedure is given for numerically combining the outputs of several bridges in such a way that the loads may be obtained. Extensions of the basic procedure by means of electrical combination of the strain-gage bridges are described which permit compromises between strain-gage installation time, availability of recording instruments, the data reduction time. The basic principles of strain-gage calibration procedures are illustrated by reference to the data for two aircraft structures of typical construction, one a straight and the other a swept horizontal stabilizer.
Author | : Clinton V. Eckstrom |
Publisher | : |
Total Pages | : 68 |
Release | : 1976 |
Genre | : Aerodynamic load |
ISBN | : |
Download Flight loads measurements obtained from calibrated strain-gage bridges mounted externally on the skin of a low-aspect-ratio wing Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 150 |
Release | : 1997 |
Genre | : |
ISBN | : |
Download A Summary of Numerous Strain-Gage Load Calibrations on Aircraft Wings and Tails in a Technological Format Book in PDF, Epub and Kindle
Author | : Michael J. Allen |
Publisher | : |
Total Pages | : 22 |
Release | : 2003 |
Genre | : Airplanes |
ISBN | : |
Download Modeling Aircraft Wing Loads from Flight Data Using Neural Networks Book in PDF, Epub and Kindle
Author | : T.H. Skopinski |
Publisher | : |
Total Pages | : 71 |
Release | : 1952 |
Genre | : |
ISBN | : |
Download Calibration of Strain-gage Installations in Aircraft Structures for the Measurement of Flight Loads Book in PDF, Epub and Kindle
Author | : |
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Total Pages | : 56 |
Release | : 1980 |
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Download Loads Calibrations of Strain Gage Bridges on the DAST Project Aeroelastic Research Wing (ARW-1) Book in PDF, Epub and Kindle