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Showing 1 to 12 of 12 for “"describing functions"”.
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Describing functions for information channels subject to packet loss and quantization
… feedback channel. First, we derive and verify describing functions (DFs) for information channels subject to quantization and packet loss. The DFs represent the loss and quantization effects by frequency- and amplitude-dependent gains and phases, similar to transfer functions. These DFs are …
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Transient Analysis of Nonlinear Servomechanisms Using Describing Functions With Root-Locus Techniques
Made available in DSpace on 2014-12-04T21:02:55Z (GMT). No. of bitstreams: 1 0020862.pdf: 21612032 bytes, checksum: 8836b5115f0cc7cbcd98af66225ca98c (MD5) Previous issue date: 1957
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Measurement of combustion response to transverse modes at high pressure
… to select relevant time slices to generate flame describing functions of image magnitude and phase lag as a function of pressure amplitude. The magnitude flame describing functions showed low amplitude linear behavior with a divergence at high amplitude. For phase lag flame describing functions, a …
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Limit Cycle PIO Analysis With Simultaneously Acting Multiple Asymmetric Saturation
… These analyses involve the use of dual input describing functions which enable the prediction of frequency, amplitude, and mean point of oscillation.
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Design of Two-axis Multivariable Control Systems
… and is extended to nonlinear systems by means of describing functions. Design studies have been made with special reference to a system for positioning a free gyroscope. This system presents special problems; in particular a high degree of interaction is involved. The new method of controller …
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Analysis and feedback control of magnetic bearings with reference to flywheel energy storage.
… magnetic components is derived. Subsequently describing functions characterising the small- as well as large signal behaviour of the same bearing in the "voltage driven" mode, are obtained. It is shown that workable results are obtained for most practical situations by using linear systems …
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Extended describing function method for small-signal modeling of resonant and multi-resonant converters
The extended describing function method is proposed as a systematic small-signal modeling approach to nonlinear switching circuits. This method offers significant simplification upon the previous work on using the multi-variable describing functions to treat the circuit nonlinearities. As an …
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Suppression of limit cycle oscillations in an aeroelastic system using robust and adaptive control
… with pitch structural nonlinearity using the describing function method is determined. The model includes unsteady aerodynamics based on Theodorsen's theory. The dual-input describing functions of the nonlinearity are used for the limit cycle analysis. Interestingly it is found that flutter …
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Pilot Variability During Pilot-Induced Oscillation
… Using spectrograms and power spectral density functions, the frequency content of a signal in the pilot-aircraft system can also be investigated. An F-14 flight test was recently performed where the hydraulic system was modified to determine the feasibility of trying to recover the aircraft …
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The Role of Swirl in the Flow Structure and Response of Premixed Flames
… flows for the same blockage ratio. The flame describing functions of those swirling flames show typical characteristics involving gain minima and maxima in the frequency space and the swirl number can alter the frequencies at which they are encountered. It is then attempted to scale the flame …
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Nonlinear algorithms for fast and robust control of electrical drives
… theorem". Its global behavior is analyzed by describing functions. Very good operation of the SVS API speed control within the proportional position loop is demonstrated. Faster transient response is achieved by implementing the SLM adaptive proportional control in the position loop. The …
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Modeling and Stability Analysis for Multiphase Constant On-Time Control With Phase Overlapping
… operating with phase overlap, utilizing the describing function method. Prior works extended the small-signal models of single-phase COT control to design multiphase COT buck converters. These extensions rely on the assumption that multiphase and single-phase COT buck converters are …