NDLI: Experimental characterization of the effects of pneumatic tubing on unsteady pressure measurements

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Experimental characterization of the effects of pneumatic tubing on unsteady pressure measurements

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lindsey, William T. Curry, Robert E. Whitmore, Stephen A. Gilyard, Glenn B.
Copyright Year	1990
Description	Advances in aircraft control system designs have, with increasing frequency, required that air data be used as flight control feedback. This condition requires that these data be measured with accuracy and high fidelity. Most air data information is provided by pneumatic pressure measuring sensors. Typically unsteady pressure data provided by pneumatic sensing systems are distorted at high frequencies. The distortion is a result of the pressure being transmitted to the pressure sensor through a length of connective tubing. The pressure is distorted by frictional damping and wave reflection. As a result, air data provided all-flush, pneumatically sensed air data systems may not meet the frequency response requirements necessary for flight control augmentation. Both lab and flight test were performed at NASA-Ames to investigate the effects of this high frequency distortion in remotely located pressure measurement systems. Good qualitative agreement between lab and flight data are demonstrated. Results from these tests are used to describe the effects of pneumatic distortion in terms of a simple parametric model.
File Size	1070758
Page Count	32
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900018387
Archival Resource Key	ark:/13960/t8sb9096x
Language	English
Publisher Date	1990-03-01
Access Restriction	Open
Subject Keyword	Aircraft Instrumentation Pressure Sensors Flight Tests Air Data Systems Control Systems Design Friction Factor Feedback Control Unsteady Flow Pipes Tubes High Frequencies Flight Control Wave Reflection Pneumatic Probes Aircraft Control Instrument Errors Pressure Measurement Signal Distortion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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