Title

V/STOL Flight Test Instrumentation Requirements for Extraction of Aerodynamic Coefficients

Date

1968

Index Abstract

Coming Soon

Photo Quality

Not Needed

Report Number

AFFDL TR 68-154 Volume 1

Creator

Hill, R. W.

Bolling, N. F.

Clinkenbeard, I. L.

Corporate Author

LTV Aerospace Corporation

Laboratory

Air Force Flight Dynamics Laboratory

Extent

310

NTRL Accession Number

AD850956

Identifier

AD0850956

Access Rights

Export Controls

Distribution Classification

1

Contract

F33615-68-C-1222

DoD Project

3170

DoD Task

317004

DTIC Record Exists

No

Distribution Change Authority Correspondence

AFFDL LTR

Distribution Conflict

No

Special Scanning Requirements

fold out pages

Abstract

The results of a synthesis of pertinent maneuvers with a mathematical model of the XC-142 V/STOL airplane have served to establish tolerances in the measurement of flight parameters which provide the time histories used in the derivation of aerodynamic coefficients. Extracting valid aerodynamic coefficients from flight test time histories requires highly accurate instruments or detailed a priori knowledge of instrumentation errors. Furthermore, the mathematical technique used should provide the capability of extracting many coefficients simultaneously and delineating the probable error of each coefficient. The method of multiple linear regression, a least squares algorithm, provides the requisite mathematical tool with adequate statistical credentials. A state-of-the-art survey and a vendor-product-line review have provided guidelines for a system that will meet the overall accuracy requirements established. Details of equipment installations, oriented toward minimizing environmental stresses (particularly vibrations), have been studied. Conclusions drawn from this program are that the assembly and application of a precision data acquisition system based on digital 'onboard' handling techniques, with the appropriate sensing instrumentation, is entirely feasible but that limited development of measurement techniques, hardware, and software are required.

Report Availability

Full text available

Date Issued

1968-12

Provenance

AFRL/VACA

Type

report

Format

1 online resource