A method for identifying some parameters of a dynamic undersea vehicle - environment system, such as a moment of inertia of rotating drive components with regard to the adjoint moments of inertia and a viscous friction factor of a propeller, is proposed. Simulation validated the high rate of convergence of the desired parameters to the true values.
A version of designing a gearless electric-power steering control system is described. An algorithm for calculating a modified PD controller based on localization is proposed for a simplified mathematical model of control object in the form of a classical two-mass steering-wheel - torsion - steering gear system. Modeling shows that such a PD controller ensures the desired system speed and damping vibrations caused by the control object.
Minimization of a partially monotone function system describing the finite-state machine (FSM) behavior is considered. A notion of a prime system implicant with maximal characteristics is introduced. It is proved that the shortest irredundant sum of the implicants is a union of the shortest irredundant sums of implicants with the same characteristics. In all implicants, the literals corresponding to the state variables have no inversions. The shortest irredundant sum of the implicants is used for FSM self-checking design.
A numerical model of processes in glow discharge plasmas is presented. The model is intended for simulating the work of plasma deposition reactors. One type of ion is considered. The ion and electron plasma components are modeled by kinetic equations with collisions. An effective parallel algorithm for modeling the processes in monosilane plasmas is designed; its main characteristics are given. Results of numerical modeling using the model are adequate to data obtained in physical experiments.
Methods of analysis and optimization of distributed multidimensional queues with priorities and dynamic control of the quality of services for sublevels of controlling multiple accesses to the medium access control in 3G/4G multiservice mobile and wireless networks are developed. A theoretical-game formulation of the problem of distributed dynamic control of the quality of services is proposed. The results obtained are based on the development of a numerical-analytical method for balancing load intensities.
Estimation of the regression model parameters is considered. A new approach to estimating the parameters for random error distributions that differ from the normal one and may be represented as the A-type Gramm-Charlier series is proposed. The developed approach is compared with the traditional least squares method and the sign method by means of computing experiments.
A new contrast image reconstruction algorithm is proposed. The algorithm is a combination of an iterative quadratic functional minimization algorithm and a local smoothing algorithm. A point-spread function of the iterative algorithm is introduced and a method for its calculation is proposed. The stopping time of the iterative algorithm is found from the required iterative algorithm resolution that is found using the point-spread function. The local filter makes it possible to reduce substantially the random error of image reconstruction without increasing the systematic error.
IR image defects (faults, overshoots, and a strong additive periodic noise) are analyzed for an autonomous observation system with an unstable radio channel communication.
Data on computer modeling a meniscus image of a crystal grown by the Czochralski method from a high-temperature melt are presented. A fine structure of the crystallization zone image formed by an optical projection system is investigated as well as the image components conditioned by intrinsic emission of the heater, melt, and crystal, and by emission reflections from melt and crystal surfaces. Causes of meniscus image parallax are analyzed; its influence on metrological characteristics of the optical crystal geometry control system is assessed.
Methods of laser interferometry based on the optical feedback and frequency-modulated laser diode effects are described. An interference signal is analyzed for problems concerned with range finding, displacement estimation, and measurement of velocities and vibration parameters. Relationships between the object movement characteristics and the interference signal parameters are found. Advantages of the new trend in interferometry are an extremely high sensitivity to scattered light, the possibility of estimating the displacement direction and obtaining information from small object surface areas, simple design, and low cost of the interferometers.
