Time-correlated gust loads using matched-filter theory and random-process theory a new way of looking at things

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Published by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va .

Written in English

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Subjects:

  • Airplanes -- Design and construction.

Edition Notes

Book details

Other titlesTime correlated gust loads using...
StatementAnthony S. Pototzky, Thomas A. Zeiler, and Boyd Perry III.
SeriesNASA technical memorandum -- 101573.
ContributionsZeiler, Thomas A., Perry, Boyd., Langley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL18034207M

Download Time-correlated gust loads using matched-filter theory and random-process theory

The SDG method is a time-domain approach and yields time-correlated gust loads by employing a search procedure.

Duri,ag the course of the NASA evaluation of the SDG method, the authors recognized that Matched Filter Theory (MFT) [2] could be applied to the linear gust problem to compute time-correlated gust loads. Calculating time-correlated gust loads using matched filter and random process theories. Prediction of Time-Correlated Gust Loads Using an Incremental Stochastic Search.

Gilholm and G. Watson ; Journal of Aircraft Vol. 36, No. 5 September Time-correlated gust loads using matched filter theory and random process theory - A new Cited by: Get this from a library.

Time-correlated gust loads using Time-correlated gust loads using matched-filter theory and random-process theory book theory and random-process theory: a new way of looking at things.

[Anthony S Pototzky; Thomas A Zeiler; Boyd Perry; Langley Research Center.]. This paper describes and illustrates two ways of performing time-correlated gust-load calculations. The first is based on Matched Filter Theory; the second on Random Process Theory. Time-correlated gust loads using matched filter theory and random process theory - A new way of looking at things By Anthony S.

Pototzky, Thomas A. Zeiler and III Boyd Perry Abstract. Random Process Theory Applied to Time-Correlated Gust Loads This figure contains a signal flow diagram with two paths and is analogous to the diagram.

in figure 8. This figure illustrates the steps necessary to generate time-correlated gust loads using Random Process Theory. Matched Filter Concept and Maximum Gust Loads. Thomas A. Zeiler ; Thomas A. Zeiler. University of Alabama, Tuscaloosa, Alabama Time-correlated gust loads using matched filter theory and random process theory - A new way of looking at by: Two ways of performing time-correlated gust-load calculations are described and illustrated.

The first is based on Matched Filter Theory; the second on Random Process Theory. Both approaches yield theoretically identical results and represent novel applications of the theories, are computationally fast, and may be applied to other dynamic.

Books. AIAA Education Series; Library of Flight; Progress in Astronautics and Aeronautics; The Aerospace Press; Time-correlated gust loads using matched filter theory and random process theory - A new way of looking at by: 3. It is then shown that the time histones of two time-correlated gust load responses, determined using the Matched Filter Theory approach, can be plotted as paramemc functions of time and that the resulting plot, when superposed upon the design ellipse corresponding to the two loads, is tangent to the.

by: 6. Sears function and lifting surface theory for harmonic gust fields. JOSEPH P. GIESING, Time-correlated gust loads using matched filter theory and random process theory - A new way of looking at things.

ANTHONY POTOTZKY, Cited by: Abstract This paper describes and illustrates two matched-filter-theory based schemes for obtaining maximized and time-correlated gust-loads for a nonlinear airplane. The first scheme is.

The first method is based on matched filter theory; the second is based on stochastic simulation. The paper summarizes the methods, discusses the selection of gust intensity for each method and.

It is then shown that the time histories of two time-correlated gust load responses, determined using the Matched Filter Theory approach, can be plotted as parametric functions of time and that the resulting plot, when superposed upon the design ellipse corresponding to the two loads, is tangent to the : Thomas A.

Zeiler and Anthony S. Pototzky. Determining design gust loads for nonlinear aircraft similarity between methods based on matched filter theory and on stochastic simulation. ROBERT SCOTT. A computer program to obtain time-correlated gust loads for nonlinear aircraft using the matched-filter-based method Article (PDF Available) March with 48 Reads How we measure 'reads'.

and the models of Probability Theory. That difierence is similar to that between laws of theoretical physics and the real world: even though mathematicians view the theory as standing on its own, when engineers use it, they see it as a model of the physical world.

Consider °ipping a fair coin repeatedly. Designate by 0 and 1 the two possible. Potozoky and Zeiler employed both the matched filter theory (MFT) and random process theory to predict time-correlated gust loads and demonstrated that the two approaches produced identical results. Recent extensions in aerodynamic correction factor methodology are also described.

With respect to analysis procedures, the paper reviews novel enhancements to Matched Filter Theory and Random Process Theory for predicting the critical gust profile and the associated time-correlated gust loads for structural design considerations. Pototzky, A. and Perry III, B., “Time-Correlated Gust Loads Using Matched Filter Theory and Random Process Theory - A New Way of Looking at Things,” AIAA Paper No.

“MSC/NASTRAN Quick Reference Guide,” The MacNeal-Schwendler Corporation. Linear Time Invariant (LTI) Systems and Matched Filter 3 Linear Time Invariant System To examine what a matched filter does, we need to visit the concept of a Linear Time Invariant (LTI) system.

Fig. 3 – The LTI transforms an incoming signal based on a fixed rule. The middle box in Fig. 3 is the LTI box which does something to a signal File Size: KB. A.S. Pototzky, T.A. Zeiler, B. Perry IIICalculating time-correlated gust loads using matched filter and random process theory Journal of Aircraft, 28 (5) (), pp.

Google ScholarCited by: reduced!iquency is determined by the effective influence on the. system flutter determinant: for control modes, by the effect on.

system gains: for gust modes. by the effect on the response IC. continuous gusts; and for hinge moment terms, by the hinge moment response to control surface a gust excitations.

Fidkowski also applied matched filter theory in combination with the Lyapunov equation to identify critical load for the stochastic gust in the conceptual aircraft design process. Knoblach [8] used robust performance analysis from control theory to identify critical loads due to discrete 1-cosine by: 6.

Section Transmission of a Random Process Through a Linear [Time-Invariant] Filter (all) Section Power Spectral Density (through page ) especially Equation () on page for time-averaged autocorrelation and the two limit definitions that immediately follow it. EL Lecture 12 May "Matched Filter, Pulse Compression and Ergodicity" - Duration: Probability, Stochastic Processes - Random Videos 4, views Maximum response with input energy constraints and the matched filter principle.

YOUSSEF and N. POPPLEWELL Journal of Sound and Vibrat A theory of the greatest maximum response of linear structures. JONES 9. POPPLEWELL and N. YOUSSEF Journal of Sound and Vibrat Cited by: This book provides a synthesis of concepts and materials that ordinarily appear separately in time series and econometrics literature, presenting a comprehensive review of both theoretical and applied concepts.

Perhaps the most novel feature of the book is its use of Kalman filtering together with econometric and time series methodology. From a technical point of view, state space models and /5(3). I believe OP is asking about the matched filter of signal processing, and another implementation called a correlation receiver.I believe this is off-topic on this site, but I'll keep you from having to go elsewhere to get your question answered.

A type of “matched filter” (MF), used extensively in the processing of one-dimensional spectra, is defined by multiplication of a free-induction decay (FID) by a decaying exponential with the same time constant as that of the FID.

This maximizes, in a sense to be defined, the signal-to-noise Cited by: $\begingroup$ Usually I would use lme from the nlme package and specify an autocorrelation structure (e.g., using corARMA).However, with 4 time points you probably won't be able to fit the autocorrelation.

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The Nelder--Mead simplex algorithm, first published inis an enormously popular direct search method for multidimensional unconstrained minimization. Despite its widespread use, essentially n Cited by: Testing the Correlated Random Coefficient Model James J.

Heckman, Daniel A. Schmierer, Sergio S. Urzua. NBER Working Paper No. Issued in October NBER Program(s):Technical Working Papers The recent literature on instrumental variables (IV) features models in which agents sort into treatment status on the basis of gains from treatment as well as on baseline-pretreatment levels.

The Nelder--Mead simplex algorithm, first published inis an enormously popular direct search method for multidimensional unconstrained minimization. Despite its widespreadCited by: Formal definition. Given a probability space (,), an X-valued random field is a collection of X-valued random variables indexed by elements in a topological space is, a random field F is a collection {: ∈}where each is an X-valued random variable.

Examples. In its discrete version, a random field is a list of random numbers whose indices are identified with a discrete set of points.

Random Factor Analysis: A statistical analysis performed to determine the origin of random data figures collected. Random factor analysis is Author: Will Kenton. A matched filter hypothesis for cognitive control Evangelia G. Chrysikou a,n,1, Matthew J.

Weber b,1, Sharon L. Thompson-Schill b a University of Kansas, Department of Psychology, Jayhawk Blvd., Fraser Hall, Lawrence, KSUnited States. The Great Filter theory says that one possible answer to this question is that there is some step (possibly more than one) in the process from "bare lifeless planet" to "galaxy-faring civilization" that must be very hard.

If that step is behind us (that is, humanity passed it at some point in our evolution), that's good news: it means we're one.

If you have a signal, x, then the matched filter's coefficients is given by time reverse of x, i.e., x(end: ). If your signal is complex, you also need to to use complex conjugate. You can then use it just as an FIR filter. For example. features in a preprocessing step using the supervised discretisation method of Fayyad and Irani ().

A measure based on information theory estimates the de-gree of association between nominal features. If Xand Y are discrete random variables, Equations 2 and 3 give the entropy of Ybefore and after observing X.

H(Y)=¡ X y2Y p(y)log 2p(y); (2.Finance. STUDY. PLAY. Limited Partnership. Theory stating that long-term rates should be higher than short-term rates. Model that uses a random variable for inputs and relies on the repetition of the same random process as many as several hundred times.

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