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Instantaneous Wind-Tunnel Model Vibration Measurements Using a Kalman Flitering Approach

[+] Author and Article Information
Robert R. Long

Department of Aerospace Engineering, Texas A&M University, College Station, Texas 77840
robertlong13@tamu.edu

Edward B. White

Department of Aerospace Engineering, Texas A&M University, College Station, Texas 77840
ebw@tamu.edu

Nathan R. Tichenor

PM & AM Research, LLC Bryan, Texas 77802
ntichenor@physics-math.com

Kevin Kremeyer

PM & AM Research, LLC Bryan, Texas 77802
kremeyer@physics-math.com

1Corresponding author.

ASME doi:10.1115/1.4036270 History: Received September 15, 2015; Revised March 13, 2017

Abstract

Experiments in ground-test facilities are required to develop and mature aero-optic platforms. However, structural vibrations of the facility can introduce significant error in optical experiments, making it difficult to separate wind tunnel dynamics from the aero-optic measurements of interest. As a means of performing this separation, a Kalman filtering scheme, tuned using the Autocovariance Least-Squares method, is implemented to measure the dynamic motion of a generalized aero-optic model geometry. An example is presented for the case of a laser diode mounted on a flexible post undergoing vibration. Using a single three-axis accelerometer, combined with a priori knowledge of the system’s structural dynamics, pitch angle fluctuations on the order of 0.01 degree were successfully estimated within 0.002 degree uncertainty.

Copyright (c) 2017 by ASME
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