DESIGN OF SPACECRAFT CONTROL SYSTEMS IN THE CLASS OF TWO-PARAMETERIC STRUCTURALLY STABLE MAPPINGS USING LYAPUNOV FUNCTION
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL, AERONAUTICAL AND PRODUCTION TECHNIQUES
Author(s): ABDRAKHMANOVA LEILA , OINAROV AZAMAT
Abstract: In this paper, we present a method increasing the potential of robust stability of control systems of spacecraft with an approach to the construction of two-parameter system in the class of structurally stable maps. Research of robust stability is produced by using the method of Lyapunov functions, based on geometric interpretation of the second Lyapunov method and definition of system stability in the state space. For research of the stability of steady states of spacecraft control system we using the ideas of the second method A.M. Lyapunov and define components of the gradient vector of the Lyapunov function. During the research, we will represent Equations of state in deviations relative to the stationary states. The general problem of Lyapunov functions for investigation of the systems with improved capacity of robust stability is defined and a condition of stability is given. We propose a method for construct the control system of spacecraft, built in the two-parameter class of s
- Publication Date: 21-Dec-2014
- DOI: 10.15224/978-1-63248-037-8-100
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MODELLING OF IN-CYLINDER CONVECTIVE HEAT TRANSFER LOSSES TO THE COMBUSTION CHAMBER WALL OF COMPRESSION-IGNITION ENGINE
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN MECHANICAL, AERONAUTICAL AND PRODUCTION TECHNIQUES
Author(s): ABDUL R. A. AZIZ , MERVIN B. STANLEY , MIOR A. SAID , ZAINAL A. A. KARIM
Abstract: Modelling of heat transfer losses to the engine wall of diesel engine involves the employment of heat transfer correlations in quasi one-dimensional thermodynamic simulation. In this study, four common existing heat transfer correlations - Woshni, Sitkei and Ramaniah, Hohenberg and Assanis - are utilised in a quasi one-dimensional thermodynamic simulation. Results are compared with experimental data from existing literature. The results indicate that Woshni’s correlation shows the best results as it includes a parameter that characterize the bore size of combustion chamber, while others exclude it. Attempt has been made to improve Woschni’s correlation by altering value of constants and power values in the velocity and temperature variables, in order to reduce the error from the experimental results. This finding reveals the current heat transfer correlations have inadequate representation of gas flow characteristics in the correlation especially in the near wall region, where velocity
- Publication Date: 21-Dec-2014
- DOI: 10.15224/978-1-63248-037-8-101
- Views: 0
- Downloads: 0