Papers by Keyword: Algorithm

Abstract: In this paper, we consider a computational algorithm that allows us to follow specific sequences in order to meet the needs of the population in a residential area. As an integral indicator, the degree of satisfaction of the needs of the population is used, which characterizes the actual level of consumption of any services in comparison with the norm of their rational consumption. The theoretical premise of the study was the fundamental principle of urban development of a favorable environment for human development. The methodological basis of the study was a vector representation of the state of the system.

Abstract: Computer simulation of vacancy clusters distribution by depth in molybdenum irradiated by alpha particles within Cascade probability method has been carried out. Cascade probability functions have been calculated taking into account energy losses for alpha particles in molybdenum and depending on number of interactions and depth of particles penetration. Microhardness comparison of calculations and modified experimental data show their satisfactory fit.

Abstract: A new approach of mechanical driving-gear dynamic analysis, which includes several modelling stages is observed in the article. On the first stage driving-gear is represented in the form of consistently connected rotation bodies. The driving-gear is represented in a graphic kind by means of the marked graph. On the second stage mathematical model of driving-gear performance with using of mnemonic rule is created. Mathematical model of mechanical driving-gear is a system of second-order regular differential equations (RDEs). The system of second-order regular differential equations is transformed into a system of first-order regular differential equations. There is a standard method for writing a higher-order RDE as a system of the first-order RDEs. On the third stage computer model of driving-gear performance using system Mathcad is created and initial data is defined. On the fourth stage the mechanical driving-gear modelling is performed and calculation data in numerical and graphical forms is obtained. This approach provides high level of the driving-gear dynamic analysis, including the received results presentation, which is especially important on the earliest stages of mechanical driving-gear design. The proposed procedure of mechanical driving-gear dynamic analysis using Mathcad software significantly decreases time and working costs on execution of such computations and helps to execute investigations related with changing of driving-gear elements parameters efficiently.

Abstract: The article describes the procedure of structurally-parametrical optimization of technological process by Dijkstra's method with using of Dijkstra’s functional (recurrent) equation and Mathcad system. The technological process includes n of operations and each operation can be executed by various types of equipment. Expenses (cost, time, ...) on execution of i operation by k equipment after execution by j equipment (i-1) operation are known - c (i, j, k). The algorithm of the decision of a problem by Dijkstra’s method includes two phases. The first phase is calculations of the minimum expenses for execution of all partial technological processes, from first operation of process to the last. The second phase is definition of the required optimum set of equipment which is carrying out all technological process with the minimum expenses from last operation of process to the first. The proposed procedure of structurally-parametrical optimization of technological process using Dijkstra’s method and Mathcad software significantly decreases time and labour costs on execution of such calculations and efficiently to execute investigations related with change of equipment parameters.

Abstract: In this work, the calculation algorithms of cascade and probability functions and vacancy nanoclusters concentration were developed and their calculations for various incident particles in silicon and iron were made.

Abstract: Base Isolation systems have been implemented on civil engineering structures subject to earthquakes worldwide for a number of years because of their simplicity, reliability, and effectiveness; passive isolators usually consist of members located in between the foundations and the super-structure and characterised by high damping capacity and relatively low stiffness. Devices are available typically coupling elements endowed with large translating deformability, mainly aimed at shifting the structural frequency band, with components devoted to dissipate and/or absorb the filtered transmitted energy. Although characterized by stability and low energy demand, BI devices are limited in their ability to adapt themselves to changing demands for structure response reduction. The performance of such devices may fail expectations under special, like in case of soft soil, or unexpected conditions, and, in order to optimize the overall performance of the control system, the isolated system should be embedded in a more complex system able to possibly activate some corrective actions. In the paper, with reference to steel structures, a strategy is outlined to this purpose, devoted to existing, or not, isolated constructions.

Abstract: The paper presents a formulation of the problem for choosing an optimal size range of technical products and a mathematical model for solving of the said problem. Particular attention is paid to the ways for satisfying the types of demand for the size ranges’ elements. Two ways are proposed, and they are formalized as constraints in a mathematical model. Methods are proposed for solving the problem in accordance with the chosen way of satisfying the demand, and an algorithm is developed. The methods and the algorithm are approbated by solving a particular problem.

Abstract: This paper describes an overall, simulation-based optimization approach to control plant operations for manufacturing calcium silicate masonry units (CS), which is directed towards and thus immediately applicable to practical processes. Starting from an investigation and classification of the CS production in order to differentiate the properties of each sub-process, specific target criteria are derived. To enable the influencing of these targets, relevant parameters including their mutual interdependencies are identified. On this basis, the criticality of each process step is assessed in order to determine improvement potentials and to investigate possible adjustments to the parameters.The elementary production types indicate a mix of the discontinuous and continuous processing in CS plants. Particularly, this work shows that through interrupting the continuous material flow, the hardening process is the main criteria for a plant’s success in meeting its targets, especially concerning energy efficiency. To achieve a feasible approach, the work develops a solving method geared to an optimized hardening process.Therefore, a formulation of a measureable target system is established, which is the prerequisite for modeling the whole optimization problem. An expedient decomposition of this optimization model to smaller sub-problems provides an efficient solving of these complex job-scheduling problems, in order to direct the method towards an operative use. The paper concludes with the determination of potential solving procedures for the overall problem and appropriate algorithms for solving the sub-problems.

Abstract: This article presents the algorithm of monitoring a high-rise building as a complex object. The functional areas (strata) of a high-rise building are considered and certain mathematical models and algorithms describing the process of monitoring a high-rise building are presented. The developed system using this algorithm should allow real-time monitoring of the life support systems, making better decisions in the event of unusual situations.

Abstract: In view of the current welding industry, there is no automated programming tool for the welding path of square battery cover. According to differential geometry theory, the principle of nonlinear error is analyzed. Then a simplified model for nonlinear error is established. Based on these, an efficient algorithm based on nonlinear error is proposed. According to the proposed algorithm, two instantiation of the algorithm are presented. Therefore, the proposed algorithm is simple, reliable, and efficient. It adapts to the requirement of two mainstream spuare battery covers perfectly.