This paper describes CONFIG, an implemented hybrid modeling and simulation approach, within a discrete event system framework, and its application to control software validation. CONFIG system models are made up of connected evices and activities, and device models are made up of mode transition models, with behavior models for each mode. Behavior models can be discrete or continuous, and chara...

We investigate the behavior of adaptive time stepping numerical algorithms under the reverse mode of automatic differentiation (AD). By differentiating the time step controller and the error estimator of the original algorithm, reverse mode AD generates spurious adjoint derivatives of the time steps. The resulting discrete adjoint models become inconsistent with the adjoint ODE, and yield incor...

This paper features the mathematical modeling of a single input single output based Timoshenko smart beam. Further, this mathematical model is used to design a multirate output feedback based discrete sliding mode controller using Bartoszewicz law to suppress the flexural vibrations. The first 2 dominant vibratory modes is retained. Here, an application of the discrete sliding mode control in s...

In Fourier spectroscopy, the absorption mode spectrum V(f) and the dispersion mode spectrum U(f) are computed from the experimentally measured impulse response /z(t). Clearly, this general principle must be applicable here as well. Some consequences of practical importance will be discussed in this paper. In practical Fourier spectroscopy a periodic pulse sequence is used to excite the spin sys...

In this paper, a wavelet based adaptive sliding mode control is designed for a class of discrete time uncertain nonlinear nonaffine systems. An equivalent affine like structure is first developed form the original nonaffine system and subsequently a wavelet based adaptive sliding mode tracking control scheme is developed for the affine like system. Wavelet neural network (WNN) is used to mimic ...

The Discrete Wavelet Transform (DWT) is one of the powerful signal processing tools. It has been effectively used in wide range of applications including image processing, speech analysis, pattern recognition and biometrics. Large amount of memory is required for storing the intermediate values for the implementation of Two Dimensional Discrete Wavelet Transform. Transposition Memory (TM) requi...

An initial-value problem is formulated for a three-dimensional wave packet in a compressible boundary layer flow. The problem is solved using a Laplace transform with respect to time and Fourier transforms with respect to the streamwise and spanwise coordinates. The solution can be presented as a sum of modes consisting of continuous and discrete spectra of temporal stability theory. Two discre...

Conventional simulation and control methods for sliding mode control systems are limited by the available sampling bandwidth and allowable tracking error. Consequently, these methods suuer from harmful chattering. This paper presents an adaptive method for the discrete-time simulation and control of sliding mode control systems, based on an analysis on the relationship between tracking error an...