Lyapunov‐stable discrete‐time model reference adaptive control

Discrete‐time model reference adaptive control (MRAC) is considered with both least squares and projection algorithm parameter identification. For both cases complete Lyapunov proofs are given for stability and convergence. The results extend the approach of Johansson (Int. J. Control 1989; 50 (3):859–869) to include Lyapunov stability for MRAC when the normalized projection algorithm is used for parameter identification. Copyright © 2005 John Wiley & Sons, Ltd.     

Improvement of a Direct Method for Outer Solution of Linear Parametric Systems

Recently, a direct method for outer solution of linear parametric systems has been suggested for the general case where the elements of the system are nonlinear functions of independent interval parameters. In this paper, an improvement of the method is introduced which may lead to a narrower outer solution.     

Addendum to: generic rules to evaluate system-failure frequency

In the paper on Generic rules to evaluate system-failure frequency, (see ibid., vol.49, p.85-7, 2000) the authora did not consider the case of shorter mission times while presenting the rules to evaluate system-failure frequency. Time-specific failure-frequency calculations are required for the systems with shorter mission times. One of the practical uses of time-specific failure-frequency is in finding reasonably accurate estimates of failure-rate and reliability of large systems consisting of repairable components, by using combinatorial methods (without using Markov models). This paper shows that, with some minor modifications, the rules in the original paper for evaluating steady-state failure-frequency can be used to find the time-specific failure-frequency     

Latest Developments in the Batchwise Application of Hot-dyeing Reactive Dyes to Cellulosic Knitwear

A dyeing profile for a range of reactive dyes suitable for application to cellulosic knitwear is defined. Such a profile shows good level-dyeing, reproducibility and fastness properties together with potential for simplified dyeing processes.     

Measuring errors of amplitude and phase for vibratory accelerations when testing objects

Measurement Techniques -     

Fast integration of reactor-kinetic equations in problems with large perturbations of the reactivity

Conclusions The method proposed for integrating the point-kinetics equations of a reactor, has a series of positive qualities ensuring its effective application in problems of the numerical analysis of the emergency dynamics of nuclear-power plants with deep perturbations of the reactivity. Its advantages include:simplicity of the programs executing the computational algorithms (the calculation is based on explicit formulas);the presence of an automatic regulator of the computation step;high speed (the number of operations in calculations at the step is comparable with the analogous characteristic of the Euler method).Translated from Atomnaya Énergiya, Vol. 67, No. 4, pp. 246–251, October, 1989.