# International Journal on Engineering Technologies and Informatics (IJETI)

Mini Review Volume1-Issue1

## Problems of Creation and Design of Engineering Systems: Mathematics, Technology and Informatics

#### Mashunin Yu K*

Professor, Far Eastern Federal University, Vladivostok, Russia
*Corresponding author: Mashunin Yu K, Professor, Far Eastern Federal University, Vladivostok, Russia
Article History
Received: December 12, 2020 Accepted: December 20, 2020 Published: December 21, 2020
Citation: Fenyvesi L. Information Systems in the Marketing Conscious Development of Agricultural Technologies. Int J. Eng Tech & Inf. 2020;1(1):01‒02. DOI: 10.51626/ijeti.2020.01.00002

Abstract

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In this work, we presented the problems that arise when automating the creation and design of engineering systems. These problems include: first, mathematical problems that are associated with a variety of functional characteristics of engineering systems, secondly, technological issues, which include the development of technical specifications, the construction of a mathematical and numerical model of an engineering system, taking into account the set of functional characteristics and constraints of the system, and, thirdly, information problems associated with solving problems in conditions of uncertainty (regression analysis) , creation of adequate software. To solve the presented problems, we presented a presentation of two works. In the field of mathematics, the monograph “Theory and methods of vector optimization” is presented, which is a development of the work https://rdcu.be/bhZ8i. In the field of technological and information problems, the article “Mathematical apparatus for selection of optimal parameters of Technical, Technological Systems and Materials based on Vector Optimization “.
Keywords: Vector optimization, Methods for solving vector problems; Engineering system modeling

Problems of choosing the optimal parameters of engineering systems in conditions of certainty and uncertainty based on vector optimization

As an object of research, we consider “Engineering systems”, which in General can include technical systems, technological processes, and materials. When researching, analyzing and designing engineering systems, the problem arises of choosing the optimal parameters of engineering systems according to their functional characteristics. Design and implementation of engineering systems include the following stages:
Selection of the best technical parameters and characteristics;
Experimental and industrial operation.
Currently, the stage of selecting the best parameters of engineering systems is the least formalized stage and is usually solved using expert assessments, as well as “trial and error”. The practical part of the work is aimed at automating this stage. In [1,2] the concept is presented as a system of views on the problem of design automation. The study of the engineering system was performed, first, under conditions of certainty, when data on the functional characteristics of the engineering system are known; secondly, under conditions of uncertainty, when the discrete (experimental) values of individual characteristics are known; data on the restrictions that are imposed on the functioning of the system are also known. In organizational terms, the concept of modeling engineering systems in terms of certainty and uncertainty is presented in the form of a flowchart in figure 1. A detailed description of each block in General is provided in .

The methodology for selecting the optimal parameters of engineering systems is based on three practical problems: the technical system, the technological process, and the choice of the optimal structure of the material. The methodology includes a number of stages.
Formation of the technical specification (source data) for numerical modeling and choice of optimum parameters of a system. The designer who projects the system forms the initial data.
Construction of mathematical and numerical models of the technical system in terms of certainty and uncertainty.
The solution of the vector problem of mathematical programming (VPMP) – a model of the Engineering system at equivalent criteria.
Creation of geometrical interpretation of results of the decision in a three-dimensional coordinate system in relative units.
The solution of a vector problem of mathematical programming – a model of the Engineering system at the given priority of the criterion.
Geometrical interpretation of results of the decision in a three-dimensional coordinate system in physical units

To implement the presented methodology, it is necessary to solve three major problems.
Mathematics. Mathematical methods must solve multi-criteria or vector problems of mathematical programming. A presentation of solutions to such problems is presented in the next section.
Technological problems, which include the formation of a technical specifications, the construction of a mathematical and numerical model of an engineering system, which depend on a set of functional characteristics of the system. The presentation of the solution to such problems is presented in the third section, [3-11, and 13].
Information problems associated with solving problems in conditions of uncertainty (regression analysis), the creation of adequate software – presented in the fourth section.
Mathematics: Vector problem of mathematical programming. Presentation of the monograph “Theory and Methods of Vector Optimization”
A vector problem in mathematical programming (VPMP) is a standard mathematical-programming problem including a set of criteria, which, in total, represent a vector of criteria.
It is important to distinguish between uniform and non-uniform VPMP:
A uniform maximizing VPMP is a vector problem in which each criterion is directed towards maximizing;
A uniform minimizing VPMP is a vector problem in which each criterion is directed towards minimizing;
A non-uniform VPMP is a vector problem in which the set of criteria is shared between two subsets (vectors) of criteria (maximization and minimization respectively), e.g., non-uniform VPMP are associated with two types of uniform problems.

According to these definitions, we will present a vector problem in mathematical programming with non-uniform criteria [14,15] in the following form:

Where is a vector of material variables, N-dimensional Euclidean space of RN, (designation is equivalent to j = 1,…,N);

F(X) is a vector function (vector criterion) having K – a component functions, (K – set power K), F(X)={f_k (X),k=¯(1,K_1 )}.The set К consists of sets of K1, a component of maximization and К2 of minimization; К=K1K2 therefore we enter the designation of the operation “opt,” which includes max and min;
F_1 (X)={f_k (X),k=¯(1,K_1 )}is maximizing vector-criterion, K1 – number of criteria, and K_1 (1,K_1 ) ̅ is a set of maximizing criteria (a problem (2.1), (2.3), (2.4) represents VPMP with the homogeneous maximizing criteria). Let’s further assume that f_k (X),k=¯(1,K_1 ) is the continuous concave functions (we will sometimes call them the maximizing criteria);

is vector criterion in which each component is minimized, K_2 (K_1+1,K) ̅(1,K_2 ) ̅ – a set of minimization criteria, K2 – number, (the problems (2.2)-(2.4) are VPMP with the homogeneous minimization criteria). We assume that is the continuous convex functions (we will sometimes call these the minimization criteria), i.e., K1K2 = K, K1K, K2K.
is standard restrictions, where bi – a set of real numbers, and gi(X) are assumed continuous and convex.

where the set of admissible points set by restrictions (2.3) -(2.4) is not empty and represents a compact.

The vector minimization function (criterion) F2(X) can be transformed to the vector maximization function (criterion) by the multiplication of each component of F2(X) to minus unit. The vector criterion of F2(X) is injected into VPMP (2.1) -(2.4) to show that, in a problem, there are two subsets of criteria of K1, K2 with various directions of optimization.

Presentation of the monograph “Theory and Methods of Vector Optimization”
To solve theoretical questions and develop methods for solving the VZMP (2.1) – (2.4) We present the monograph “Theory and Methods of Vector Optimization” which includes the following chapters.
Chapter 1. Vector problems in Mathematical Programming (VPMP).
Chapter 2. The theoretical bases of vector optimization.
Chapter 3. Methods for solving problems OF vector optimization.
Chapter 4. Research and analysis of approaches to problem-solving in vector optimization.
Chapter 5. The theory of vector problems in mathematical programming with independent criteria.
Chapter 6. The duality of vector problems in linear programming (VPLP).
Chapter 7. the theory of management decision-making based on vector optimization.

Abstract

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