285 Matching Results

Search Results

Advanced search parameters have been applied.

A method for the calculation of the lateral response of airplanes to random turbulence

Description: In this method, the gust velocities are represented as rolling gusts, yawing gusts, and side gusts. Random distributions of gust velocities across the span are taken into account in defining the rolling and yawing gusts. Complex stability derivatives are used to account for the random distribution of side gusts along the fuselage and vertical tail and the lag effects in gust penetration. A sample calculation procedure is presented for obtaining the response of the airplane in each degree of freedom.
Date: February 1958
Creator: Eggleston, John M. & Phillips, William H.
Partner: UNT Libraries Government Documents Department

Theoretical study of the lateral frequency response to gusts of a fighter airplane, both with controls fixed and with several types of autopilots

Description: Report presenting a theoretical approach to determine the lateral frequency response of a fighter airplane to side gusts and rolling gusts at a Mach number of 0.7 and an altitude of 30,000 feet. Frequency response and power spectral density were determined with the controls fixed and in combination with three different basic types of attitude autopilots.
Date: March 1956
Creator: Adams, James J. & Mathews, Charles W.
Partner: UNT Libraries Government Documents Department

Comparison of several methods for obtaining the time response of linear systems to either a unit impulse or arbitrary input from frequency-response data

Description: Report presenting a description and comparison of several methods of obtaining the time response of linear systems to either a unit impulse or an arbitrary input from frequency-response data. All of the methods give good accuracy when applied to a second-order system; the main difference is the required computing time.
Date: July 1956
Creator: Donegan, James J. & Huss, Carl R.
Partner: UNT Libraries Government Documents Department

Comparison of several methods for obtaining the time response of linear systems to either a unit impulse or arbitrary input from frequency-response data

Description: From Summary: "Several methods of obtaining the time response of Linear systems to either a unit impulse or an arbitrary input from frequency-response data are described and compared. Comparisons indicate that all the methods give good accuracy when applied to a second-order system; the main difference is the required computing time. The methods generally classified as inverse Laplace transform methods were found to be most effective in determining the response to a unit impulse from frequency-response data of higher order systems. Some discussion and examples are given of the use of such methods as flight-data-analysis techniques in predicting loads and motions of a flexible aircraft on the basis of simple calculations when the aircraft frequency response is known."
Date: March 16, 1956
Creator: Donegan, James J. & Huss, Carl R.
Partner: UNT Libraries Government Documents Department

Matrix method of determining the longitudinal-stability coefficients and frequency response of an aircraft from transient flight data

Description: From Summary: "A matrix method is presented for determining the longitudinal-stability coefficients and frequency response of an aircraft from arbitrary maneuvers. The method is devised so that it can be applied to time-history measurements of combinations of such simple quantities as angle of attack, pitching velocity, load factor, elevator angle, and hinge moment to obtain the over-all coefficients. Although the method has been devised primarily for the evaluation of stability coefficients which are of primary interest in most aircraft loads and stability studies, it can be used also, with a simple additional computation, to determine the frequency-response characteristics. The entire procedure can be applied or extended to other problems which can be expressed by linear differential equations."
Date: December 15, 1950
Creator: Donegan, James J. & Pearson, Henry A.
Partner: UNT Libraries Government Documents Department

Method and tables for determining the time response to a unit impulse from frequency-response data and for determining the fourier transform of a function of time

Description: From Summary: "A simple and rapid method is presented for the determination of the time response to a unit impulse from a frequency-response data and for evaluating the Fourier transform of a function of time. Both methods are applicable to linear functions for which Fourier transforms exist. Tables are presented which greatly reduce the time required to perform the computations. Procedures for performing the calculations by use of the tables are illustrated and outlined step by step."
Date: January 1956
Creator: Huss, Carl R. & Donegan, James J.
Partner: UNT Libraries Government Documents Department

Lift and moment responses to penetration of sharp-edged traveling gusts, with application to penetration of weak blast waves

Description: Report presenting calculations of the lift and moment responses to penetration of sharp-edged traveling gusts for wings in incompressible and supersonic two-dimensional flow, for wide delta and rectangular wings in supersonic flow, and for very narrow delta wings. The results of the calculations indicate that the forward speed of the gusts has a large effect on the lift- and moment-response functions.
Date: May 1957
Creator: Drischler, Joseph A. & Diederich, Franklin W.
Partner: UNT Libraries Government Documents Department

Flight Investigation of Transient Wing Response on a Four-Engine Bomber Airplane in Rough Air With Respect to Center-of-Gravity Accelerations

Description: Report presenting a flight investigation on a four-engine bomber to determine the effect of transient wing response in rough air on the acceleration measurements at the center of gravity of the airplane. Flights occurred in clear-air turbulence for two speed and two weight conditions. The results indicate that transient-response effects on total aerodynamic load are small for the test airplane.
Date: September 1952
Creator: Mickleboro, Harry C.; Fahrer, Richard B. & Shufflebarger, C. C.
Partner: UNT Libraries Government Documents Department

Frequency Response of Linear Systems From Transient Data

Description: "Methods are presented that use general correlative time-response input and output data for a linear system to determine the frequency-response function of that system. These methods give an exact description of any linear system for which such transient data are available. Examples are shown of application of a method to both an underdamped and a critically damped exact second-order system, and to an exact first-order system with and without dead time. Experimental data for a turbine-propeller engine showing the response of engine speed to change in propeller-blade angle are presented and analyzed" (p. 547).
Date: April 1, 1949
Creator: LaVerne, Melvin E. & Boksenbom, Aaron S.
Partner: UNT Libraries Government Documents Department

Investigation of the dynamic response of airplane wings to gusts

Description: Report presenting a method of predicting the dynamic response of airplane wings to gusts by considering only the fundamental mode of bending along with the results of model tests to evaluate the method. Results regarding experimental results and associated calculations, limitations of calculations, and results calculated for effect of change of certain parameters are provided.
Date: June 1947
Creator: Pierce, Harold B.
Partner: UNT Libraries Government Documents Department

The Role of Contingent-Anxious Versus Temporally Yoked Conditioned Stimulus Termination in the Enhancement or Conservation of Learned Fear

Description: This study investigated whether contingent-anxious conditioned stimulus termination was more important than temporally yoked termination in producing conservation or enhancement of learned fear. Thirty psychology students, twenty-six females and four males, were administered item thirty-nine from the Fear Survey Schedule and an avoidance test. After in vivo treatment exposure to a harmless snake, post-test measures identical to pretests revealed that contingent-anxious subjects retained significantly more fear (p <.05) on both indexes than temporally yoked subjects. No enhancement was found and only on the subjective measure did contingent-anxious subjects show fear conservation when contrasted with no-treatment controls (p >.05). Implications for "implosive" therapies were discussed.
Date: December 1974
Creator: Dial, Miles H.
Partner: UNT Libraries

Theoretical and Experimental Investigation of Random Gust Loads Part 2: Theoretical Formulation of Atmospheric Gust Response Problem

Description: Note presenting equations of motion derived for the dynamic response of an aircraft to random atmospheric gust loads. The equations include the degrees of freedom of plunging, pitching, rolling, and an arbitrary number of elastic normal modes. Results for simplified cases show that unsteady aerodynamic theory is not important for increasingly large values of the turbulence scale compared with values of the wing chord.
Date: May 1957
Creator: Richardson, A. S., Jr.
Partner: UNT Libraries Government Documents Department

An Investigation of the Relationships Between Counselors' Physiological and Therapeutic Responses in a Low-Stress and High-Stress Counseling Encounter

Description: The problem with which this study is concerned is to examine whether relationships can be identified between a counselor's change in verbal and physiological responses when subjected to low-stress and high-stress producing counseling encounters. It was concluded that under high-stress as opposed to low-stress conditions 1) counselors' heart-rates increase and become more variable; 2) counselors' levels of verbal effectiveness are relatively uninfluenced; and 3) no consistent and predictable relationship can be identified between counselors' verbal and physiological functioning. Caution is strongly advised in generalizing to subjects separate from this study.
Date: August 1977
Creator: Edwards, Martin R.
Partner: UNT Libraries

The U.S. Climate Change Science Program Vision for the Program and Highlights of the Scientific Strategic Plan

Description: The vision document provides an overview of the Climate Change Science Program (CCSP) long-term strategic plan to enhance scientific understanding of global climate change.This document is a companion to the comprehensive Strategic Plan for the Climate Change Science Program.
Date: July 2003
Creator: Climate Change Science Program and the Subcommittee on Global Change Research
Partner: UNT Libraries

Fiscal Year 2005- 2006 Accelerated Research on Global Climate Observations Fact Sheet

Description: Coincident with the release of the Climate Change Science Program strategic plan, the Administration announces plans for the acceleration of select high priority research projects and climate observations. These activities contribute to filling critical knowledge gaps identified in the plan (aerosols, oceans and the natural carbon cycle). The selected investments have been coordinated among the agencies to maximize the overall impact. Funding will be reallocated from lower priority areas to enable these critical investments.
Date: 2003
Creator: Climate Change Science Program
Partner: UNT Libraries