Papers by Keyword: Complex Systems

Abstract: The article considers the use of numerical methods in the SCILAB environment for modeling particle trajectories under the influence of various physical forces: gravity, electromagnetism and friction. The simulations conducted allowed us to study the dynamics of particle motion in three-dimensional space under various conditions, in particular the influence of forces on changing trajectories and stabilizing motion. The results obtained demonstrate the effectiveness of using the SCILAB software as a tool for numerical modeling of complex physical systems, which ensures the accuracy of calculations and clarity of visualization. It should also be noted that the use of such approaches allows us to study particle motion in various fields of science and technology, in particular in physics, engineering and systems analysis. Numerical methods implemented in SCILAB provide flexibility in taking into account the initial conditions and parameters of the system, opening up prospects for further research into complex interactions in multicomponent systems.

Abstract: The evolution of ideas about materials is analyzed: the initial accumulation of data, experience and skills in the production of new material (the emergence of new technology); identification of patterns of influence of various factors on the properties of the material with the involvement of fundamental sciences (the formation of a new technology); obtaining building material with a given level of quality (development of an effective technology ); identification of the technological process and the construction of an adequate model of “recipe-technological factors - structure - quality of the material”. In models of structural material science, the existence of certain hierarchical structures of objects considered as systems is assumed; model selection is determined by the objectives of the structural description of the object at each scale level. The shift of paradigms based on the basic models of a continuous self-developing environment to the side of paradigms based on models of a structured self-developing environment based on the ideas and methods of a systematic approach and synergetics is indicated. The approaches to the fundamentalization of the synthesis of materials based on their own experience in designing materials for special purposes are presented: the presentation of the material in the form of a complex system (at first - poorly structured with conflicting goals and criteria); quality assessment of composite materials; formalization of kinetic processes; material quality management; minimization of dimension of criterion space; multi-criteria optimization.

Abstract: The European and International energy policy targets energy efficiency improvement and CO₂ reduction. Therefore, renewables are key players within our future energy supply system. In order to ensure security of energy supply and to avoid load peaks, highly interconnected power grids, also known as smart grids, have to deal with irregularities of phenomena such as sunlight, wind, tides and intelligently control these dynamic changes. Such a smart grid is denoted as a complex system. That is characterized by a large quantity of heterogeneous actors, collaborating within a dynamic and highly interconnected network. This results in big challenges in the steps planning, realizing and expanding such a system. These steps need to be based on a standardized description process to cope with the aforementioned challenges. In this paper, we combine the Smart Grid Architecture Model (SGAM) with the Use Case Methodology for describing processes in complex systems. Our new UC-SGAM Methodology exploits the benefits of both approaches and can also be applied to the Reference Architecture Model Industry 4.0 (RAMI4.0). The developed methodology is examined on two overload scenarios of the smart grid. It strongly enhances comparability and simplifies the visualization of complex use cases.

Abstract: It is proposed the unified concept of applications of analitical theory of approximation in the development of building materials and flight simulators of modular architecture as complex systems. The annex to the development of simulators of flight dynamics are given the approximation of table - graphically defined functions and functions of several variables by polynomials of higher degrees. It is planned to implement the methods in real-time via parallelization of computational processes. Is given the approximation of aerodynamic factors in simulator of the dynamics of the flight of transport aircraft. It is proposed the description of kinetic processes of formation of physical and mechanical properties of materials to solve control problems of their properties. It indicates the possibility of overcoming the uncertainty targets based on an objective assessment of each of the properties (quality criteria) with their analytical description by polynomial models. The approximation methods are implemented on modern computers. Efficiency was confirmed in the development of training systems for the training of operators of different transport systems and design of composite materials with special properties.

Abstract: We considered the problems of mathematical modeling of composite materials in the example of the development of materials for the protection against ionizing radiation. Construction materials are provided as a complex system with the appropriate attributes. The structure and physico-mechanical properties of the material were determined by the results of the modeling of kinetic processes. Process of forming properties is described by the differential equation in deviations from the equilibrium state (as for dispersion system). It is taken into account the elastic and damping properties of the material. To predict the behavior of the building material and the formation of his private mathematical models are used a representation of the processes as of time series. It is given the algorithm for studies (with considering prehistory) of formation of the basic physical and mechanical properties of epoxy composites for radiation protection. We present an example of the identification of building materials with special properties. Approaches used effectively in the development of materials with special properties.

Abstract: The work presents a proposal of mathematical algorithm developed for analysis of piezoelectric stacks that consist of classical PZT piezoelectric transducers. The considered systems vibrate longitudinally. Piezoelectric plates are combined in order to obtain multiplied displacement of the system and ensure more effective operation. Using constitutive equations of piezoelectric materials and an equation of the single plate’s motion, a matrix of characteristics of the system was obtained. The matrix of characteristics consists of relations between mechanical and electrical parameters (forces, displacements, electric current and voltage) that describe behaviour of the system. A structural damping of the plate’s material was being taken into consideration using Kelvin-Voigt model of material and its influence on the plate’s dynamic flexibility was analyzed [1, 2]. A dynamic flexibility – relation between the plate’s deformation and a force applied to the system is considered. Using the obtained dependences and non-classical methods, characteristics of piezoelectric stacks were designated and presented on charts. The obtained results were juxtaposed with characteristics of the system without structural damping.

Abstract: In recent years, near-space platforms become a major military power of research. Performance evaluation of System for a comprehensive optimization design has a very important role. For the current network-centric warfare environment information superiority significant impact on system performance, it establishes a whole process of near space information system performance evaluation index system. For the assessment of near space multi-level system performance, complexity, and other characteristics, a kind of multi-level gray comprehensive evaluation model phased approach is proposed. Using the approach for performance evaluation of near space system in information operations phase for example verifies the practicality.

Abstract: Redundancy allocation (RA) is one of the important approaches to improve system reliability by incorporating generally s-identical and s-independent components. However in the presence of common cause failures (CCF), a rarely studied problem as Redundancy optimization, the optimized system reliability may be adversely affected. In this paper the effect of CCF on Reliability Optimization using Redundancy Allocation has been expedited. The paper is implemented in two steps. Step1 involves obtaining the optimized solution of the problem using existing techniques. In the next step, modifications are done to compute optimized system reliability under CCF. The optimized reliability expression is modified to depict the effect of CCF. The work is extended to complex network analysis & implicit method has been used to do this work. The adverse effect of CCF on system reliability has also been demonstrated quantitatively with the help of example.