MOTION PICTURE STUDIES ON THE MOTION OF NOCTILUCENT CLOUDS
Abstract
AD-264 146Div. 8U (TIPSE/DLW) OTS price $1.60 Space Technology Labs., Inc., Los Angeles, Calif. THE STABILITY OF PULSE-WIDTH MODULATED AUTOMATIC CONTROL SYSTEMS, by N. N. Pechorina, tr. by Z. Jakubski. Jan 61, 11p. incl. illus. tables (Rept. no. STL-TR 61-5110-3, Trans. from Izvestiya Akademii Nauk SSSR, Energetika i Avtomatika, No. 2, 1960) Unclassified report DESCRIPTORS: (Control systems, Automatic, *Pulse modulation, Stability, *Harmonic analy sis, Nonlinear systems, Functions, Bessel functions, Fourier analysis.) (Technological intelligence, Translations, USSR.) (Data, Sampling, *Control systems.) A harmonic analysis is presented of the modulator output for a sinusoidal input. This output is represented as a Fourier series whose coefficients are determined in terms of pulse amplitude, pulse duty cycle, and maximum pulse width. The basic assumption in the analysis is that phase shifts between the input sinusoids and the pulse train were not taken into account. The method of harmonic balance is used in an approximate stability analysis of a pulse width modulated sampled data control system. A complex transfer coefficient for the pulse-width modulated control system is defined in terms of the input amplitude and frequency. This enables amplitude and phase versus frequency characteristics to be determined for various input amplitudes of a pulse width modulated control system is presented with a numerical example. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1961
- Accession Number
- AD0264145
Entities
People
- N.i. Grishin
Organizations
- TRW Inc.