Device determines average rms value of buffet signals by integrating rms signals from strain gages for preselected period of time. System measures average rms value of other transient data, and the upper frequency limit depends on the frequency response of the amplifiers

Batts, C. N.

English

NASA Technical Reports Server

December 1970	 Brief 70-10639 
NASA TECH BRIEF 
NASA Tech Briefs announce new technology derived from the U.S. space program. They are issued to encourage commercial 
application. Tech Briefs are available on a subscription basis from the National Technical Information Service, Springfield, 
Virginia 22151. Requests for individual copies or questions relating to the Tech Brief progam may be directed to the Tech-
nology Utilization Division, NASA, Code UT, Washington, D.C. 20546. 
Integrator for On-Line Measurement of Buffet Signals
Output 
Output 
Output
	
Output. 
Dual Channel Buffet Data Acquisition System Block Diagram. 
A novel device determines the average rms value of 
bending-moment (buffet) signals by integrating rms 
signals from strain gages for a preselected period of 
time. The device also suppresses dc voltages from the 
strain-gage bridge and provides automatic recording 
of the amplifier-gain settings. Previously, the average 
rms value was estimated from fluctuations observed on 
an rms voltmeter, and each data point and gain setting 
was manually recorded and plotted. 
The new system (see fig.) incorporates several 
commercially available instruments: a dual-channel
oscilloscope, two rms voltmeters, and a dual-output 
power supply. The balance of the equipment is fabri-
cated from commercially available hardware and 
modular solid-state components. The system can be 
used to measure the average rms value of other 
tran'sient data, and the upper fequency limit depends 
on the frequency response of the amplifiers. 
Integration of the buffet signals eliminates the need 
for estimating their average rms value and in-
creases the accuracy of that value. The automatic 
suppression of dc voltages resulting from static loads 
(continued overlea(( 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19700000619 2020-03-17T01:01:29+00:00Z
eliminates the possibility of amplifier saturation and 
subsequent loss of data. Operator time is saved by 
eliminating the manual bridge-balance procedures 
that were previously required for the data points and 
automatic recording of the amplifier-gain settings 
eliminates human error in reading and recording infor-
mation, and saves operator time. The integrated out-
put signal can be recorded by devices having only a 
dc response. 
Note: 
Requests for further information may be directed 
to:
Technology Utilization Officer 
Langley Research Center 
Hampton, Virginia 23365 
Reference: TSP70- 10639
Patent status: 
Inquiries about obtaining rights for the commercial 
use of this invention may be made to: 
Patent Counsel 
Mail Code 173 
Langley Research Center 
Hampton, Virginia 23365
Source: C. N. Batts

Langley Research Center

(LA R-10627)
. 
[1 
. 
Brief 70-10639 Category 02


Integrator for on-line measurement of buffet signals

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server