Integral Equations Related to Volterra Series and Inverse Problems: Elements of Theory and Applications in Heat Power Engineering

• Published in: Mathematics (Basel) Vol. 9; no. 16; p. 1905
• Main Authors: Solodusha, Svetlana, Bulatov, Mikhail
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.08.2021
• Subjects: Algorithms; Automatic control; Computational fluid dynamics; Dynamical systems; Energy; Enthalpy; Fluid flow; Fuzzy sets; Heat exchange; Heat exchangers; Integral equations; integro-algebraic equations; Inverse problems; Literature reviews; mathematical modeling; Neural networks; Nonlinear dynamics; Nonlinear systems; Numerical analysis; Optimization; Polynomials; Power plants; Power series; Radiation; Simulation; Volterra integral equations; Volterra series
• ISSN: 2227-7390; 2227-7390
• DOI: 10.3390/math9161905

The paper considers two types of Volterra integral equations of the first kind, arising in the study of inverse problems of the dynamics of controlled heat power systems. The main focus of the work is aimed at studying the specifics of the classes of Volterra equations of the first kind that arise when describing nonlinear dynamics using the apparatus of Volterra integro-power series. The subject area of the research is represented by a simulation model of a heat exchange unit element, which describes the change in enthalpy with arbitrary changes in fluid flow and heat supply. The numerical results of solving the problem of identification of transient characteristics are presented. They illustrate the fundamental importance of practical recommendations based on sufficient conditions for the solvability of linear multidimensional Volterra equations of the first kind. A new class of nonlinear systems of integro-algebraic equations of the first kind, related to the problem of automatic control of technical objects with vector inputs and outputs, is distinguished. For such systems, sufficient conditions are given for the existence of a unique, sufficiently smooth solution. A review of the literature on these problem types is given.