Iterative computer aided procedure was developed which provides for identification of boiler transfer functions using frequency response data. Method uses frequency response data to obtain satisfactory transfer function for both high and low vapor exit quality data

Miles, J. H.

English

An iterative computer method is described for identifying boiler transfer functions using frequency response data. An objective penalized performance measure and a nonlinear minimization technique are used to cause the locus of points generated by a transfer function to resemble the locus of points obtained from frequency response measurements. Different transfer functions can be tried until a satisfactory empirical transfer function to the system is found. To illustrate the method, some examples and some results from a study of a set of data consisting of measurements of the inlet impedance of a single tube forced flow boiler with inserts are given

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Computer method for identification of boiler transfer functions

September 1972 B72-10582 
NASA TECH BRIEF 
Lewis Research Center	
_4V 
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 program may 
be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Computer Method for Identification

of Boiler Transfer Functions 
In order to establish dynamic system stability criteria, 
studies of the dynamic stability of single tube boilers 
have been conducted. These studies consist of measuring 
the frequency response of the system. As part of the 
analytical program, a method was developed to identify 
transfer functions from these measurements. 
The frequency response data consist of the amplitude 
ratio and the phase angle difference of two parameters 
at various frequencies. The frequency response is con-
sidered to be identified if a transfer function that fits 
the frequency response data is obtained. 
An iterative computer aided procedure has been 
developed which provides for the iaentification of 
boiler transfer functions using frequency response data. 
The method uses the frequency response data to obtain 
a satisfactory transfer ,
 function for both high and low 
vapor exit quality data. 
Notes: 
1. Although this method is not designed for any speci-
fic computer, it is recommended that a time-sharing 
system be used.
2. The following documentation may be obtained from: 
National Technical Information Service 
Springfield, Virginia 22151 
Single document price $3.00 
(or microfiche $0.95) 
Reference: NASA-TM-X-2436 (N72-13917), 
Computer Method for Identification of Boiler 
Transfer Functions 
Technical questions may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B72-10582
Soucre: Jeffrey H. Miles 
Lewis Research Center 
(LEW. 1 1808) 
Category 09, 06 
This document was prepared under the sponsorship of the National
	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States
	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights.
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Computer method for identification of boiler transfer functions

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