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1
DUNAI, LÁSZLÓ, and GÁBOR JAKAB. "STABILITY BEHAVIOR AND DESIGN OF NONCONVENTIONAL COLD-FORMED STEEL STRUCTURES — RESEARCH REVIEW." International Journal of Structural Stability and Dynamics 11, no. 05 (October 2011): 903–27. http://dx.doi.org/10.1142/s0219455411004397.
Повний текст джерелаАнотація:
In the paper, the methodology and main results of two research projects on nonconventional cold-formed thin-walled steel structures are presented. Laboratory tests, standard-based calculations, numerical models, and the connection of these to design method development are summarized. The implementation of the methodology is presented on two areas in detail: CompressionC-section members and a truss made of C-section members. The studied CompressionC-section members are of various cross-sectional arrangement and end- and lateral-supporting conditions. They consist of single or double asymmetric C-section members; in the latter case, either a back-to-back arrangement is applied or two sections are stuck in each other, forming a box-like closed section. The applied load is in each case compression with different eccentricities. Test arrangement, program, and results are presented; measured load-bearing capacities are compared to resistances calculated according to Eurocode 3, Part 1–3 where applicable, design rules for the cases not covered by the code are proposed. Trusses made of C-sections from the same product line are analyzed in the light of full-scale laboratory tests. EC3-based design formulae are derived for the failure modes obtained in the tests either by modifying existing application rules or by deriving new ones from these. Advanced numerical models of both structures are presented with focus on modeling imperfections, bolted connections, and joint rigidities.
2
Abakumov, R., and A. Al-Sabaeei. "ASSESSMENT OF THE RELIABILITY LEVEL OF STRENGTHENING OPTIONS FOR BUILDING STEEL STRUCTURES USING THE MATHEMATICAL MODEL OF THEIR UNINTERRUPTED OPERATION." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 6, no. 7 (July 10, 2021): 44–50. http://dx.doi.org/10.34031/2071-7318-2021-6-7-44-50.
Повний текст джерелаАнотація:
The article is devoted to the issues of assessing the level of reliability of options for strengthening building metal structures using mathematical models of the probability of their uninterrupted operation. The increasing requirements for the structural safety of building metal structures, the need to use justified mathematical calculations confirming their performance and safety, taking into account various reinforcement options determine the relevance of this study. The content of the article is based on the platform of the theoretical basis for the design of reinforcement of metal structures. It is predetermined by the subsequent synthesis of innovative solutions in assessing the level of reliability building structures taking into account the use of mathematical modeling of the probability of uninterrupted operation. The article presents an analysis of the problem points of using the probabilistic method for calculating the level of reliability of building metal structures. This allows to assess the compliance of the existing loads with standard values and guarantee the reliable operation of building metal structures. The characteristics that influence the assessment of the level of reliability of options for strengthening building metal structures using mathematical modeling are highlighted. A critical review of the amplification options from the point of view of the use of mathematical models of the probability of the operation of a metal structure is presented. Attention is focused on the construction of an optimization mathematical model of the bearing capacity of a metal structure using probability theory, Gram-Charlier series, Gumbel's law, Weibull's law. An example of strengthening of a load-bearing truss using a mathematical model for assessing the level of reliability of a metal structure is described. The proposed option will improve the safety, bearing capacity of the structure while ensuring the perception of the maximum possible load and at the same time will reduce the cost of this type of structure in construction.
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Hamidavi, Tofigh, Sepehr Abrishami, Pasquale Ponterosso, David Begg, and Nikos Nanos. "OSD." Construction Innovation 20, no. 2 (March 14, 2020): 149–69. http://dx.doi.org/10.1108/ci-11-2019-0126.
Повний текст джерелаАнотація:
Purpose The paper aims to leverage the importance of the integrated automatic structural design for tall buildings at the early stage. It proposes to use an automatic prototype to perform the structural design, analysis and optimisation in a building information modelling (BIM)-based platform. This process starts with extracting the required information from the architectural model in Revit Autodesk, such as boundary conditions and designs different options of the structural models in Robot Autodesk. In this process, Dynamo for Revit is used to define the mathematical functions to use different variables and generate various structural models. The paper aims to expand the domain of automation in the BIM platform to reduce the iterative process in different areas such as conceptual structural design and collaboration between architects and structural engineers to reduce the time and cost at the early stages. Design/methodology/approach The paper begins with an exploratory research by adopting a qualitative methodology and using open-ended questions to achieve more information about the phenomenon of automation and interoperability between structural engineers and architects and gain new insight into this area. Furthermore, correlation research is used by adopting quantitative and short questions to compare the proposed prototype with the traditional process of the structural design and optimisation and the interoperability between architects and engineers and consequently, validate the research. Findings As an outcome of the research, a structural design optimisation (SDO) prototype was developed to semi-automate the structural design process of tall buildings at the early stages. Moreover, the proposed prototype can be used during the early stage of structural design in different areas such as residential buildings, bridges, truss, reinforced concrete detailing, etc. Moreover, comprehensive literature regarding using automation in structural design, optimisation process and interoperability between architects and engineers is conducted that provides a new insight to contribute to future research and development. Research limitations/implications Due to the time limit, the paper results may lack in a comprehensive automatic structural design process. Therefore, the researchers are encouraged to expand the workability of the prototype for a comprehensive automatic design check such as automatic design for the minimum deflection, displacement of different types of buildings. Practical implications The prototype includes implications for the development of different automatic designs. Originality/value The focus of this paper is the optimisation of the structural design in the BIM platform by using automation. This combination is one of the novelties of this paper, and the existing literature has a very limited amount of information and similar work in this area, especially interoperability between architects and engineers.
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Hohol, Myron, and Dmytro Sydorak. "STRUCTURAL EFFICIENCY OF STEEL COMBINED TRUSSES." Theory and Building Practice 2022, no. 2 (December 20, 2022): 58–67. http://dx.doi.org/10.23939/jtbp2022.02.058.
Повний текст джерелаАнотація:
In this article on increasing the efficiency of steel combined structures, the tasks of rational design, regulation and control of structural parameters of elements, the use of steels with increased mechanical properties are considered. It is shown that for a six-span stiffening girder of a combined truss with elastic supports, which operates under a distributed load, the moment is 72 times smaller than the moment of a single-span beam. It is suggested to use high-strength steel for truss braces. Rationality criteria are proposed. On the basis of rationality criteria, new steel combined trusses were developed and their models were designed for stress tests. The results of experimental studies of models of combined trusses are presented. The results of experimental studies conducted on models of steel combined trusses qualitatively and quantitatively confirmed the theoretical results obtained on the basis of the proposed theory.
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Atkočiūnas, Juozas, Dalia Merkevičiūte, Artūras Venskus, and Juozas Nagevičius. "MATHEMATICAL MODELS FOR OPTIMAL SHAKEDOWN TRUSSES DESIGN PROBLEMS IN CASE OF MOVING LOAD." Technological and Economic Development of Economy 13, no. 2 (June 30, 2007): 93–99. http://dx.doi.org/10.3846/13928619.2007.9637782.
Повний текст джерелаАнотація:
Prisitaikomumo teorija, nagrinejanti tampriai plastiškas konstrukcijas, veikiama kintamosios kartotines apkrovos, leidžia judamaja apkrova traktuoti kaip atskira kartotinai kintančiu jegu atveji. Apkrovai leidžiama “judeti” bet kuria konstrukcijos dalimi: nuo tilto vidurio, grižti atgal, vel i prieki ‐ taip universaliai ivertinama apkrovimo istorija, kuri yra lemiamas faktorius, nagrinejant plastines deformacijas patiriančios konstrukcijos itempiu ir deformaciju būvi. Straipsnyje atskleista galimybe taikyti prisitaikomumo teorijos metodus, sudarant teorinius santvaru optimizavimo uždaviniu matematinius modelius ir juos sprendžiant. Nagrinejama idealiai tampriai plastine žinomos geometrijos santvara, veikiama judamosios apkrovos. Sudaryti minimalaus tūrio santvaros ar javeikiančios apkrovos maksimizavimo uždaviniu matematiniai modeliai. Modeliuose ivertinamos ne tik konstrukcijos stiprumo (prisitaikomumo) ir standumo salygos, bet ir stabilumo netekimo galimybe esant plastinei santvaros darbo stadijai. Pasiūlyti nauji sprendimo algoritmai, pateikti skaitiniai strypu lankstines santvaros, veikiamos judamosios apkrovos, optimizavimo uždaviniu pavyzdžiai. Tyrimai atlikti, darant mažu poslinkiu prielaida.
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Pantelides, Chris P., and Sara Ganzerli. "Design of Trusses Under Uncertain Loads Using Convex Models." Journal of Structural Engineering 124, no. 3 (March 1998): 318–29. http://dx.doi.org/10.1061/(asce)0733-9445(1998)124:3(318).
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Soloveva, Anastasia A., and Sergey A. Solovev. "Reliability analysis of planar steel trusses based on p-box models." Vestnik MGSU, no. 2 (February 2021): 153–67. http://dx.doi.org/10.22227/1997-0935.2021.2.153-167.
Повний текст джерелаАнотація:
Introduction. The development of probabilistic approaches to the assessment of mechanical safety of bearing structural elements is one of the most relevant areas of research in the construction industry. In this research, probabilistic methods are developed to perform the reliability analysis of steel truss elements using the p-box (probability box) approach. This approach ensures a more conservative (interval-based) reliability assessment made within the framework of attaining practical objectives of the reliability analysis of planar trusses and their elements. The truss is analyzed as a provisional sequential mechanical system (in the language of the theory of reliability) consisting of elements that represent reliability values for each individual bar and truss node in terms of all criteria of limit states.
Materials and methods. The co-authors suggest using p-blocks consisting of two boundary distribution functions designated for modeling random variables in the mathematical models of limit states performed within the framework of the truss reliability analysis instead of independent true functions of the probability distribution of random variables. Boundary distribution functions produce a probability distribution domain in which a true distribution function of a random variable is located. However this function is unknown in advance due to the aleatory and epistemic uncertainty. The choice of a p-block for modeling a random variable will depend on the type and amount of statistical information about the random variable.
Results. The probabilistic snow load model and the numerical simulation of tests of steel samples of truss rods are employed to show that p-box models are optimal for modeling random variables to solve numerous practical problems of the probabilistic assessment of reliability of structural elements. The proposed p-box snow load model is based on the Gumbel distribution. The mathematical model used to perform the reliability analysis of planar steel truss elements is proposed. The co-authors provide calculation formulas to assess the reliability of a truss element for different types of p-blocks used to describe random variables depending on the amount of statistical data available.
Conclusions. The application of statistically unsubstantiated hypotheses for choosing the probability distribution law or assessing the parameters of the probability distribution of a random variable leads to erroneous assessments of the reliability of structural elements, including trusses. P-boxes ensure a more careful reliability assessment of a structural element, but at the same time this assessment is less informative, as it is presented in the form of an interval. A more accurate reliability interval requires interval-based assessments of distribution parameters or types of p-boxes applied to mathematical models of the limit state, which entails an increase in the economic and labor costs of the statistical data.
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Kazaryan, Ruben, Peraskovya Andreeva, and Natalya Galaeva. "Organization of planning in transport construction." E3S Web of Conferences 157 (2020): 04006. http://dx.doi.org/10.1051/e3sconf/202015704006.
Повний текст джерелаАнотація:
Purpose. Development of methods and models of economic efficiency of the integrated use of various modes of transport in the interests of ensuring national security of the state. Methods. System analysis, logical-mathematical modeling, systems theory, economic-visual modeling, research methods of operations, economic and mathematical methods. Results. The paper discusses the need for the application of economic and mathematical models in the design of transport construction (model of “moving the earth masses”, linear programming model, design of the “red line” on the longitudinal profile, dynamic programming model). Conclusion. The difficult stage of the transition of economic and mathematical analysis from the verbal description of the system process to the elemental base of the mathematical apparatus. Most research models of operations are designed for single criteria. Economic and mathematical modeling allows the effect of “private optimization”.
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Janušaitis, Rolandas, Valerijus Keras, and Jūratė Mockienė. "DEVELOPMENT OF METHODS FOR DESIGNING RATIONAL TRUSSES." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 9, no. 3 (September 30, 2003): 192–97. http://dx.doi.org/10.3846/13923730.2003.10531325.
Повний текст джерелаАнотація:
Striving for rationality and long-term reliability is seen in different periods of building activities. Application of linear programming methods has enabled to formalise this striving and to elaborate the necessary mathematical models. But later theoretical and practical investigations have disclosed that not always, when optimising in respect of one criterion, it is possible to obtain solutions rational in other aspects, and this stimulated the application of multicriteria optimization methods. It is useful in this case to apply the ideas of the game theory, game problems solving methods already applied in other building design fields. When adapting methods of the game theory to popular needs for truss designing, a criteria set involving 11 alternatives has been selected. Attempts have been made to find rational truss variants by applying different methods (method of proximity to an ideal point, Wald's and Hurwitz's methods). It has been found when using the method of proximity to an ideal point for rational truss designing that a truss with a sloping brace network and pivoted knots supported by a column and composed of rectangular box shapes is more valuable than other trusses. According to Wald's and Hurvitz's methods, among popular spans of 24 m such a truss is the truss with a lowered bottom chord.
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Wang, Haoqing, Wen Yi, and Yannick Liu. "Optimal Route Design for Construction Waste Transportation Systems: Mathematical Models and Solution Algorithms." Mathematics 10, no. 22 (November 18, 2022): 4340. http://dx.doi.org/10.3390/math10224340.
Повний текст джерелаАнотація:
A huge amount of construction waste is generated in construction sites every day that needs to be transported by vehicle to disposal facilities for processing. Unlike in most typical transportation problems, once these vehicles are loaded with construction waste, they must travel directly to the disposal facility. Moreover, there are different types of construction waste that may require handling by different disposal facilities. In this paper, we develop a model and algorithm for identifying the optimal transportation routes specific to construction waste transportation. Our results can not only minimize the overall costs for both the logistics company and the contractor but also minimize the distance traveled, thus reducing urban traffic emissions.
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Burt, Michael. "Infinite Polyhedra Lattice (I.P.L) Space Trusses: Morphology, Analysis And Application." International Journal of Space Structures 11, no. 1-2 (April 1996): 115–26. http://dx.doi.org/10.1177/026635119601-218.
Повний текст джерелаАнотація:
The hyperbolic finite and infinite surfaces and Polyhedra, abstract models of all poly-genus Sponge-like and labyrinthian configutations, are among a new array of basic forms which were introduced and morphologically explored, mostly in the last few decades. I.P.L. Space Trusses are among the first engineered architectural applications of this new form family. Morphologically they are based on Periodic Hyperbolic Surfaces and their tessellations, the so called “Infinite Polyhedra Lattices” (hence - I.P.L.) which were developed by the author over the last thirty years. They represent a novel mode of material distribution in space which enables to achieve higher structural performance (in terms of attainable spans and amount of invested material), and far-reaching design opportunities. Because of their size and complexity, I.P.L. trusses pose a very intense calculation problem which requires great ingenuity and powerful (paranet) computer systems. The article describes the evolution of the concept, form generation, design considerations and their application to wide-span and high-rise mega-structures.
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Hazelrigg, G. A. "On the Role and Use of Mathematical Models in Engineering Design." Journal of Mechanical Design 121, no. 3 (September 1, 1999): 336–41. http://dx.doi.org/10.1115/1.2829465.
Повний текст джерелаАнотація:
Mathematical models encompassing virtually all aspects of engineered products are in widespread use. Indeed, entire industries exist in support of some models: finite element models, computational fluid dynamics models, electric power grid load-flow models, process models, simulation models, and so on. Nonetheless, the purpose, construction, and use of models is not adequately understood. One major issue is that no model perfectly represents reality. Therefore models always diverge from reality somewhere, and they are always inaccurate by some amount. Estimation of model error and the use of model-generated results in support of engineering design decision making are key to the successful use of models.
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Zastempowski, Marcin, Andrzej Bochat, and Lubomír Hujo. "Selected Aspects of Modelling and Design Calculations of Roller Mills." Sustainability 13, no. 5 (March 1, 2021): 2595. http://dx.doi.org/10.3390/su13052595.
Повний текст джерелаАнотація:
An analysis of construction was conducted in this study, and the guidelines for designing roller mills used commonly in the agri-food, chemical, power and construction industries were presented. Quick designing of the machines required existence of adequate mathematical models. Within the framework of the study’s realization, a mathematical model was developed and we presented the selected results of calculations of the milling rollers loading from the assembly’s mill bowl. The simulation calculations conducted with the mathematical model unambiguously show that the roller’s rotation around a fixed point considerably influences the total loading of the mill’s bowl, and passing over that phenomenon is a mistake.
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Ngowtanasuwan, Grit. "Applied Mathematical Approach for Decision-Making in Building Plan Design." Asian Journal of Behavioural Studies 3, no. 9 (January 5, 2018): 39. http://dx.doi.org/10.21834/ajbes.v3i9.59.
Повний текст джерелаАнотація:
This article presents a method for solving decision in building plan design by using a mathematical model (nonlinear programming). First objective is to formulate mathematical models for analysis in dividing rooms and dimensions in a building plan. Secondly, to calculate the dimensions and room sizes which have minimum construction cost. A case study of a condominium building plan was analyzed in this research. The results found application of the mathematical model was applicable. The mathematical models were formulated, the minimum construction cost was ฿723,000 (US$24,100) and usable area in the condominium was 67.5 m2 and followed the assigned design constraints.Keywords: Building plan design; Mathematical model; Unit cost;eISSN 2398-4295 © 2018. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open-access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia. DOI:
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Kowalski, J. "An Operation Strategy for Mathematical Modeling in Optimum Design of Machine Construction." Journal of Mechanisms, Transmissions, and Automation in Design 107, no. 4 (December 1, 1985): 463–76. http://dx.doi.org/10.1115/1.3260747.
Повний текст джерелаАнотація:
The paper describes an operation strategy, based on the systems approach, to enable quality control for design of products. The ideas outlined make possible a two-level hierarchic modeling system controlled according to principles of classification of product models. Elements of the optimization theory for model-based design are given, including an application example for the optimum design of a self-loading trailer assembly.
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Boscato, Giosuè, Giorgio Costantini, and Vincenzo Scafuri. "Seismic Design of Pultruded FRP Structures as Ancillary and/or Independent Solution." Key Engineering Materials 747 (July 2017): 586–93. http://dx.doi.org/10.4028/www.scientific.net/kem.747.586.
Повний текст джерелаАнотація:
The civil engineering fields of FRP (Fiber Reinforced Polymers) pultruded profiles are the structural rehabilitation of the existing constructions and the new buildings. In the first case the FRP intervention is ancillary to masonry construction as beams and trusses for roofs and floors; while, in the second case, the all-FRP structures are for over elevation frame, emergency and specific structures in complex conditions. The non-linear responses of masonry structures with truss beams made of pultruded FRP profiles and traditional materials have been compared through finite element models subjected to the seismic forces. Furthermore, the seismic response of all-FRP building with concentric diagonal braces has been analysed. For both applications it is possible to assert that despite the absence of ductile behaviour of FRP pultruded material, the new technology guarantees a dissipative response through the global ductility and the effect of the low self-weight related to the mechanical performances.
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Sokolnikov, Vladimir V. "The problem of definitions and classification of theoretical models of construction planning, design preparation and building technology." Vestnik MGSU, no. 11 (November 2022): 1564–73. http://dx.doi.org/10.22227/1997-0935.2022.11.1564-1573.
Повний текст джерелаАнотація:
Introduction. Presently, definitions applied to the concepts of “modelling” and “model”, which do not specify their affiliation, are widely used in research, development and education. They deal with design preparation, construction planning, building technologies and other related areas. The purpose of this study is to propose and justify the classification structure for research and engineering models, focused on the tasks of construction planning and building technologies during design preparation and performance of construction work. This classification will make it possible (a) to structure model names and related methods used to solve problems of building technologies and construction planning, (b) to mutually relate models as well as solution methods, and (c) to limit the application of general definitions to special research and engineering models.
Materials and methods. The author analyzed information modelling standards in construction, general definitions of models and modelling frequently used in construction planning, design preparation and building technologies. Research and engineering ideas, concerning the tasks of modelling and classification of models, are provided in the article. The pattern of theoretical classification of modelling types and cases of theoretical attribution of models are presented.
Results. The author classified some research and engineering models used in design, construction planning and building technologies. The author interpreted the continuity equation of mathematical physics, performed the analysis and attribution of the mathematical model of a construction process flow, and confirmed the need to perform the attribution of models on the basis of variables, physical parameters and the essence of problems that they solved. The author proposed a record format for a theoretical model name in the above-mentioned areas of construction research.
Conclusions. The conclusion is that there is a need to introduce the attribution of current and new theoretical models into the practice of research in construction planning, design preparation and building technology; there is a need for consistency of research, engineering and educational terminology applicable to descriptions of theoretical models in construction planning and building technology. The procedure of attributing theoretical models is proposed.
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Tatum, S. A., J. C. Byrum, and P. W. Rourke. "Design Validation Using Computer Models in Lieu of Full-Scale Mockups." Marine Technology and SNAME News 31, no. 03 (July 1, 1994): 225–30. http://dx.doi.org/10.5957/mt1.1994.31.3.225.
Повний текст джерелаАнотація:
For many years the complexity of submarine design has required the construction of full-scale mockups to integrate the system designs, plan the construction, and verify the operability. In the late 1980's, computer technology evolved to allow ship design to be accomplished by developing comprehensive mathematical models of the ship's arrangement. Imaging of these models creates a virtual reality of the ship's interior. This paper explores the features of this technology that emulate the function of the physical mockup, discusses experience to date in the SEAWOLF design at Newport News Shipbuilding in applying CAD technology as a mockup alternative, and looks to the opportunities that are available in the near term.
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Chelyshkov, Pavel. "Computer-aided design of cyber-physical building systems." E3S Web of Conferences 97 (2019): 01012. http://dx.doi.org/10.1051/e3sconf/20199701012.
Повний текст джерелаАнотація:
At present, an increasing number of researchers and specialists in the construction industry come to the opinion that it is advisable to use a number of technologies (BIM, Smart City, Big Data, IOT and others) in the practice of construction (in the broad sense of this concept), which are united by the concept of the Fourth Industrial Revolution. The result of the implementation of these technologies in the construction should be the transition to the widespread use of cyber-physical systems. The problem of using information technologies in construction today is not due to the lack of this process as such, but to the lack of consistency and consistency in it. Fragmentary nature of the application, inconsistency of the applied technologies at different levels of management and at different stages of the life cycle of construction projects sharply reduce the potential positive effect of informatization and building automation. At the same time, the concept of cyber-physical systems, that is, the integration at the system level of physical processes and controls has proven effective in industrial production. The approaches to ensuring the processes of designing cyber-physical building systems through the development and application of General mathematical models for the processes of data exchange and management are considered. The presented models of data exchange and management of cyber-physical building systems describe the processes implemented at each stage of the life cycle of cyber-physical building systems. Functional blocks of the considered models allow to describe the processes of data collection, storage and processing on the current and past stages of the life cycle of cyber-physical construction systems. The presented models are the elements of mathematical support of the processes of designing cyber-physical building systems, which determine the processes of information exchange and management between the structures of cyber-physical building systems of different levels of hierarchy in the full life cycle.
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Kazaryan, R., N. Galaeva, R. Avetisyan, and Sh Aliev. "Building lifecycle management based on 4D modelling as the main workspace for building risk assessment." E3S Web of Conferences 224 (2020): 02023. http://dx.doi.org/10.1051/e3sconf/202022402023.
Повний текст джерелаАнотація:
The use of information technology in the management of construction projects has become a decisive factor for the successful completion of projects, taking into account time, quality and financial costs. There are challenges in visualizing the planning process and integrating information between stakeholders. The paper considers some aspects of the development trend of information technology in construction. The element base, including the risks arising during the design and construction, associated with the direct use of computer and mathematical models of the object in the design is considered. The generated information models will provide basic information for the participants in the design process, which ultimately will be the basis of the element base of an effective tool for ensuring project life cycle management. The following methods were used: system analysis, logical-mathematical modelling, systems theory, economic-visual modelling, research methods of operations, economic and mathematical methods. A basic block diagram of 4D modelling is presented to minimize the occurrence of risks during design. The model allows considering the possibility of assessing the duration of the project, the level of labour productivity, as well as visualizing the construction process. The presented analysis indicates the importance of using 4D modelling in relation to the life cycle of the object in order to prevent the possibility of construction risks.
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Zharov, Iaroslav. "Organizational-technological decisions in construction based on neural network models." MATEC Web of Conferences 251 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201825105002.
Повний текст джерелаАнотація:
Increasing the quality of organizational and technological solutions in construction is one of the main tasks facing the construction industry. The actual methods of solving the problem of setting organizational and technological design are directly related to the integration of specialized software in the planning and design of construction projects, especially for unique, complex projects, projects implemented in tight time and construction sites in the current urban development. The existing need to process a significant amount of information at short intervals and to link design decisions to the dynamic environment of the construction site is not an easy task, but a realizable one. Within the framework of the research work carried out at the department of MGSU, the expediency of applying operational assessments of the parameters of organizational and technological solutions based on mathematical methods has been established. The proposed method for forecasting and evaluating the integral parameters of design solutions is based on a neural network model, the method used involves the formation of a training matrix comprising key indicators of implemented (pilot) ones.
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Handayani, R., RT Lopa, and R. Karamma. "Flood Analysis of Bila River with Mathematical Models." IOP Conference Series: Earth and Environmental Science 1134, no. 1 (January 1, 2023): 012017. http://dx.doi.org/10.1088/1755-1315/1134/1/012017.
Повний текст джерелаАнотація:
Abstract The Bila River is one of the rivers in South Sulawesi, especially in Sidrap Regency which almost every year experience river overflows that cause flooding in the area around the river and cause losses to the community trying to analyze the flood of the river Bila with a mathematical model. The method used is to perform hydrological calculations with the help of the HEC-HMS application and simulation of flood discharge with the help of the HEC-RAS application. The results obtained are based on the results of running the HEC-RAS application with a design flood discharge of Q20 yr = 1518.10 m3/s. Recommendations for handling the flood of the Bila. River in the short, medium, and long, namely the addition of top embankments at the point of overflow, installation of control gates on tributaries and construction of retention ponds. Short and medium term amounted to 812.57 Ha and for long term handling amounted to 829.26 Ha.
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Nevolin, Anatoly G., and Denis B. Novoselov. "CREATING AND MAINTAINING DIGITAL PLANS FOR THE CONSTRUCTION OF MINING ENTERPRISES IN THE KEMEROVO REGION." Interexpo GEO-Siberia 1 (May 21, 2021): 25–34. http://dx.doi.org/10.33764/2618-981x-2021-1-25-34.
Повний текст джерелаАнотація:
Currently, in the design of large industrial enterprises, modern building information models (BIM) are being introduced and further used at the construction site. The construction industry is transitioning to digitalization of information modeling processes using spatial data and electronic document management. Therefore, it is proposed to use unmanned aerial vehicles (UAVs) and terrestrial laser scanners more efficiently for geodetic monitoring of the construction of industrial facilities of mining enterprises. With the systematic monitoring of construction, a full-fledged master plan is created, which reflects all deviations from the project, including works that were not provided for in the project documentation. It is known that using UAVs to collect spatial data, it is possible to control earthworks, pile fields, foundations, temporary roads and landscaping. Structures such as metal and reinforced concrete columns, trusses, beams, technological equipment, complex above-ground pipelines and facades are advisable to be monitored using a ground-based laser scanner. All the data obtained during geodetic monitoring can be combined in a single project and jointly used for a comprehensive solution of various applied engineering problems both in the process of monitoring buildings and structures being erected, and during their operation.
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Petrenko, Lubov, Svetlana Manzhilevskaya, Aleksandr Shilov, and Al-Hajj Ali Abdullah Saleh. "The far-seeing planning systems and models for the construction management." MATEC Web of Conferences 170 (2018): 01007. http://dx.doi.org/10.1051/matecconf/201817001007.
Повний текст джерелаАнотація:
The scientific basis of the organization of construction production involves the development of innovative models and methods of construction planning. The article studies the issues of perspective planning. After several years of research, the authors propose a new approach to forecasting and long-term planning. The authors consider the construction as a holistic design and realistic complex. As defined by the Bank of World, a project is a set of interrelated activities designed to achieve objectives within a given time frame and budget, with clearly defined objectives. In the article the mathematical model allowing to plan construction production for long term and to operate it is offered. The proposed method makes it possible to effectively and ergonomically solve the problems of construction plan and construction management.
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Argarini, Dian Fitri, Nok Izatul Yazidah, and Anik Kurniawati. "THE CONSTRUCTION LEARNING MEDIA AND LEVEL OF STUDENTS’ MATHEMATICAL COMMUNICATION ABILITY." Infinity Journal 9, no. 1 (January 27, 2020): 1. http://dx.doi.org/10.22460/infinity.v9i1.p1-14.
Повний текст джерелаАнотація:
This study aims to look at the effect of the use of instructional media on student learning achievement in terms of students' mathematical communication. The learning media in this study are textbooks with a constructivism approach that has been validated and tested previously. This study will compare the learning achievements of students who learn using constructivism learning models with constructivism media, constructivism learning models without media, and direct learning. This is a quasi-experimental research with a 3 × 3 factorial design. It involved junior high school students in Malang district as the research population. Based on the hypothesis, it is revealed that : (1) students who learn using constructivism approach with constructivist media had better performance than other groups, (2) students with high mathematical communication had higher learning achievement than students with moderate and low communication skills, ( 3) based on the category of high, moderate and low mathematical communication, students with constructivist learning and constructivist media gained better achievements, (4) in the constructivist learning group using constructivist media, constructivist learning without media, and direct learning, students with high mathematical communication gained better achievement than students with moderate and low mathematical communication
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Corredor, Deisy, and Luis Alfonso Caicedo. "A bibliographic review of mathematical models of packed-bed biological reactors (PBR)." Ingeniería e Investigación 25, no. 3 (September 1, 2005): 101–10. http://dx.doi.org/10.15446/ing.investig.v25n3.14664.
Повний текст джерелаАнотація:
Several authors have subjected packed-bed biological reactors to mathematical and theoretical analysis. They have taken reaction kinetics and single-dimensional, homogeneous, pseudo-homogeneous and heterogeneous models into account. Numerical methods have provided the set of equations so developed. The effect of physically important process variables in terms of design and operation have been investigated (i.e. residence time, operating-flow, substrate conversion, bio-film area and film thickness).
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Solovyova, A. A., and S. A. Solovyov. "STRUCTURAL RELIABILITY ANALYSIS OF STEEL TRUSS ELEMENTS ON BUCKLING USING PBOX APPROACH." STRUCTURAL MECHANICS AND ANALYSIS OF CONSTRUCTIONS, no. 1 (February 25, 2021): 45–53. http://dx.doi.org/10.37538/0039-2383.2021.1.45.53.
Повний текст джерелаАнотація:
Abstract. The reliability of load-bearing structural elements is one of the indicators of structural safety. The article presents methods for steel trusses bars reliability analysis according to the buckling criterion using p-boxes. A p-box consists of two boundary probability distribution functions that form the area of possible distribution functions. Such model used for modeling random variables in conditions of incomplete statistical data by quantity or quality. An algorithm for summing p-boxes of random load models is demonstrated on the example of a probabilistic estimate of the force in the truss bar. The result of reliability analysis using p-boxes is presented in interval form. The use of p-boxes makes it possible to obtain a more cautious assessment of reliability in case of incomplete statistical data. To increase the informativity of the reliability analysis result, it is necessary to obtain more statistical data about random variables in design mathematical models of limit state, which will allow forming p-boxes with narrower boundary distribution functions.
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DANILUShKIN, A. I., and V. A. DANILUShKIN. "MODELLING OF INDUCTION HEATING OF EXTRUDER BARREL DURING MANUFACTURING EXPANDED POLYSTYRENE SLABS." Urban construction and architecture 1, no. 1 (February 15, 2011): 129–32. http://dx.doi.org/10.17673/vestnik.2011.01.25.
Повний текст джерелаАнотація:
The mathematical models of the process of indirect induction heating of granulated polystyrene in extruder during manifacturing of expanded polystyrene slabs are viewed. The proposed models are used to design energy-efficient construction of induction heaters in extrusion- type line for the production of expanded polystyrene slabs.
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Mason, Joanna F., Martin E. Homer, and R. E. Wilson. "Mathematical Models of Gear Rattle in Roots Blower Vacuum Pumps." Applied Mechanics and Materials 5-6 (October 2006): 21–28. http://dx.doi.org/10.4028/www.scientific.net/amm.5-6.21.
Повний текст джерелаАнотація:
This paper is concerned with the modelling of gear rattle in Roots blower vacuum pumps. Analysis of experimental data reveals that the source of the noise and vibration problem is the backlash nonlinearity due to gear teeth losing and re-establishing contact.We develop non- smooth ordinary differential equation models for the dynamics of the pump. The models include a time-dependent forcing term which arises from the imperfect, eccentric mounting of the gears. We use a combination of explicit construction, asymptotic methods and numerical techniques to classify complicated dynamic behaviour in realistic parametric regimes. We first present a linear analysis of motions where the gears do not lose contact, and develop upper bounds on eccentricity for quiet operation. We then develop a nonlinear analysis of ‘backlash oscillations’, where the gears lose and re-establish contact, corresponding to noisy pump operation. It is found that noisy solutions can coexist with silent ones, explaining why geared systems can rattle intermittently. We then consider several possible design solutions, and show their implications for pump design in terms of the existence and stability of silent and noisy solutions. Finally, we present conclusions and possibilities for future work.
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Novikov, Pavel I. "Identifying Real Stiffness Properties of Structural Elements of Adapted Finite-Element Models of Buildings and Structures - Part 1: Problem Setting." Applied Mechanics and Materials 670-671 (October 2014): 732–35. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.732.
Повний текст джерелаАнотація:
The distinctive paper is devoted to problem of identification the dynamic characteristics of mathematical models based on the measured dynamic characteristics of real constructions. It is describes a problem of discrepancy of measured and modeling eigen pairs. It is shown that the problem is systemic. The creation and verification processes of mathematical (finite element) models used in the design constructions need some work and adjustments. For a reliable analysis of the construction ways are suggested to overcome the identified gaps using adaptive procedures.
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Li, Huan, Xuhui He, Liang Hu, and Guoji Xu. "Quantification of aerodynamic forces for truss bridge-girders based on wind tunnel test and kriging surrogate model." Advances in Structural Engineering 24, no. 10 (February 11, 2021): 2161–75. http://dx.doi.org/10.1177/1369433221992497.
Повний текст джерелаАнотація:
This study presents an investigation to quantify the aerodynamics of truss bridge-girders via wind tunnel test and kriging surrogate model. Currently, the conventional methods documented in design specifications only take into consideration the mean drag force at null attack angle. To gain an in-depth understanding on the aerodynamics of truss bridge-girders, experiments on simplified bridge-girder models with various geometric parameters were carried out in uniform flow. A total of 15 truss bridge-girder models with aspect ratio (the ratio of width to height) B/D = 1.0, 1.3, 1.6, 1.9, and 2.2, solidity ratio (the ratio of projected to envelope areas) Φ = 0.20, 0.25, 0.30, 0.35, and 0.40, and two typical truss topologies (Warren and Pratt trusses) were examined in the most concerned range of wind angle of attack α = [–6°, 6°]. These truss bridge-girder models cover most of the high-speed railway bridges widely used in China. Experimental results show that the truss topology has limited effects on the aerodynamics of truss bridge-girders, whereas the effects of α, B/D, and Φ are significant. Based on these wind tunnel results, the ordinary kriging surrogate model was utilized to approximate the aerodynamics of truss bridge-girders. In using this model, aerodynamic force values for test cases can be interpolated with zero variance and uncertainties in unsampled design zones where geometric parameters can be quantified with Gaussian variance.
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Abadjiev, Valentin, and Haruhisa Kawasaki. "Computer Synthesis Approaches of Hyperboloid Gear Drives with Linear Contact." Journal of Theoretical and Applied Mechanics 44, no. 3 (September 1, 2014): 3–20. http://dx.doi.org/10.2478/jtam-2014-0013.
Повний текст джерелаАнотація:
Abstract The computer design has improved forming different type software for scientific researches in the field of gearing theory as well as performing an adequate scientific support of the gear drives manufacture. Here are attached computer programs that are based on mathematical models as a result of scientific researches. The modern gear transmissions require the construction of new mathematical approaches to their geometric, technological and strength analysis. The process of optimization, synthesis and design is based on adequate iteration procedures to find out an optimal solution by varying definite parameters. The study is dedicated to accepted methodology in the creation of soft- ware for the synthesis of a class high reduction hyperboloid gears - Spiroid and Helicon ones (Spiroid and Helicon are trademarks registered by the Illinois Tool Works, Chicago, Ill). The developed basic computer products belong to software, based on original mathematical models. They are based on the two mathematical models for the synthesis: “upon a pitch contact point” and “upon a mesh region”. Computer programs are worked out on the basis of the described mathematical models, and the relations between them are shown. The application of the shown approaches to the synthesis of commented gear drives is illustrated.
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Stückelberger, Jürg, Hans Rudolf Heinimann, and Woodam Chung. "Improved road network design models with the consideration of various link patterns and road design elements." Canadian Journal of Forest Research 37, no. 11 (November 2007): 2281–98. http://dx.doi.org/10.1139/x07-036.
Повний текст джерелаАнотація:
The success of an automatic road network layout over steep terrain mainly depends on the model design. Most previous models have used a grid representation that considers only eight adjacent cells when evaluating feasible road links. Here, we present improved models and alignment constraints mapped on a mathematical graph for better designs that are more applicable under field conditions. We have refined the link pattern by considering up to 48 neighbouring cells and have introduced 16 directional classes per grid cell. Optimization techniques, such as shortest path, minimum spanning tree, and Steiner minimum tree algorithms, are used on the graph to derive a road network that is optimal in terms of its construction costs. These improved models have been applied to different mountainous project areas. Our results show that, by considering various link patterns and alignment constraints, one can determine more appropriate and cost-effective locations for road networks, especially in steep terrain.
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Alwisy, Aladdin, Ahmed Bouferguene, and Mohamed Al-Hussein. "Factor-based target cost modelling for construction projects." Canadian Journal of Civil Engineering 45, no. 5 (May 2018): 393–406. http://dx.doi.org/10.1139/cjce-2017-0289.
Повний текст джерелаАнотація:
Target value design (TVD) principles set the main guidelines for the design-estimate process that allow the efficient exploration of available construction alternatives, thereby helping construction companies to reduce cost-to-design, cost-to-build, and improve the quality of construction projects. The successful application of TVD requires a clear understanding of the interactions among construction components. The proposed target cost modelling approach introduces an algorithmic factor-based framework to advance TVD that supports the design-estimate process by examining the relationships among building components, their direct and indirect impact on project overall cost and value. Construction factors control compatibility and performance analysis among available construction alternatives. Costing factors contribute to the development of mathematical costing models capable of automatically calculating the cost of compatible alternatives. Finally, rule-based analysis, developed under an appropriate programming environment, executes alternative value analysis to develop a detailed estimate with an improved overall value for construction projects.
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Yang, Jingkang, Mingde Duan, Bo Zhang, and Huadong Shi. "Design and Dynamic Analysis of Cleaning Robot for Cement Silos." Journal of Physics: Conference Series 2187, no. 1 (February 1, 2022): 012025. http://dx.doi.org/10.1088/1742-6596/2187/1/012025.
Повний текст джерелаАнотація:
Abstract Aiming at the mechanization and automation of cleaning the hardening on the wall of the cement silo, a silo cleaning robot is designed. The kinematics and dynamics mathematical models of the cleaning robot are established respectively. With the 12000mm diameter silo as the cleaning object, the dynamics model is constructed with virtual prototype. There is an analysis of the relationship between the angular velocity and angular acceleration of the mechanical arm, and the relationship between the thrust of the cylinder over time were analyzed. The results show that the calculation results of the mathematical model and the simulation model are close, the change trend is consistent, and the movement is stable and meets the design requirements, which verifies the correctness of the mathematical model. The research results provide a theoretical basis for the next step of control system design and strength analysis. This silo cleaning robot solution can be extended to the cleaning construction of other silos such as coal bunkers, granaries and ore silo.
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Cucos, Marius Marian, Ionut Madalin Pista, and Marius Ionut Ripanu. "Product engineering design enhancing by parameterizing the 3D solid model." MATEC Web of Conferences 178 (2018): 05011. http://dx.doi.org/10.1051/matecconf/201817805011.
Повний текст джерелаАнотація:
The research approach and the case study presented in the paper are oriented towards the convergent use of a parametric modelling algorithm and of an advanced integrated CAD/CAE solution for the optimization of the product engineering design, for reducing the product life cycle environmental impact and for providing sustainability in product development. First of all, a conceptual model for the research framework is proposed, where the use of mathematical models (equations/mathematical relations, etc.) integrated into advanced CAD/CAE design solutions leads to parameterizing of the product structure and obtaining of some product component families (gears, shafts, screws, nuts, bushings, etc.). The presented case study refers to the application of the above outlined solutions for enhancing the design effectiveness and efficiency of 3D product assembly and part models (hereby exemplified for component parts like shafts and gears) for a particular construction of a technological device, using the powerful tools of the integrated product family Creo Parametric (Pro/Engineer) as mechanical design software. Some suitable conclusions are finally presented and some directions of further researches are also included.
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Biloshytska, Nataliia, Mykola Biloshytskyi, Zakhar Tatarchenko, and Bohdan Diachuk. "MATHEMATICAL MODELING OF CONSTRUCTION WORK CONSTRUCTIONS IN COMPLEX CONDITIONS OF CHEMICAL PRODUCTION." Urban development and spatial planning, no. 81 (August 31, 2022): 59–69. http://dx.doi.org/10.32347/2076-815x.2022.81.59-69.
Повний текст джерелаАнотація:
The article deals with the conduct of a numerical experiment on study of the stress-strain state of building structures according to using developed mathematical models. Research methodology consists in the use of one of the most advanced BIM technologies in the world, namely of the LIRA 10.10 software complex © 2013-2021 LIRA Soft, for creating adequate mathematical models of an industrial building taking into account the most likely difficult operating conditions: loads, seismic and operational impacts, progressive collapse. Calculations have been made progressive collapse, where the initial calculation scheme is taken as the main scheme of the shelf. To determine the most dangerous part of the building in in the event of an emergency situation, a set of calculations was carried out with the sequential removal of each support column. From the analysis of calculations, calculation schemes were determined, in which the greatest forces arise from a special combination of loads. Later, these schemes were adopted basic for emergency calculations. Conducted mathematical modeling the work of building structures in difficult chemical conditions production using modern BIM technology, such as PC LIRA 10.10, allows you to get the necessary reliable data on the operation of real buildings thanks to the use of world experience in design, construction and operation of construction structures, buildings and structures during creation software product.
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Zhou, Jiale, Chuanxi Li, Lu Ke, Jun He, and Zhifeng Wang. "Experimental Study on Loading Capacity of Glued-Laminated Timber Arches Subjected to Vertical Concentrated Loads." Advances in Civil Engineering 2020 (May 22, 2020): 1–9. http://dx.doi.org/10.1155/2020/7987414.
Повний текст джерелаАнотація:
Glued-laminated timber arches are widely used in gymnasiums, bridges, and roof trusses. However, studies on their mechanical behaviours and design methods are still insufficient. This paper investigates the in-plane loading capacity of circular glued-laminated timber arches made of Douglas fir. Experiments were conducted on four timber-arch models with different rise-to-span ratios under concentrated loads at mid-span and quarter-point locations. The structural responses, failure modes, and loading capacity of the timber arch specimens were obtained. The results show that the timber arches presented symmetric and antisymmetric deformation under mid-point and quarter-point loading conditions, respectively. The downward shifting of the neutral axis of the cross section was observed under mid-point loading condition, which contributes to higher loading capacity compared to that under quarter-point loading condition. The loading condition significantly affects the ultimate loads and the strain distribution in the cross section. Based on the design formula in current standards for timber structures, an equivalent beam-column method was introduced to estimate the loading capacity of the laminated timber arches under vertical concentrated loads. The moment amplification factor in the formula was compared and discussed, and the value provided in the National Design Specification for Wood Construction was recommended with acceptable accuracy.
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Cheng, Jing, Xiaofan Lu, and Xionggang Zhang. "Construction of Enterprise Financial Early Warning Model Based on Intelligent Mathematical Model." Mathematical Problems in Engineering 2022 (May 13, 2022): 1–12. http://dx.doi.org/10.1155/2022/5230147.
Повний текст джерелаАнотація:
In order to improve the ability of enterprises to cope with financial risks, this paper analyzes the financial early warning of enterprises combined with intelligent mathematical models and builds an intelligent financial early warning model to assist in analyzing the financial status of enterprises. Moreover, this paper combines the existing information technology and expenditure business scenarios to construct an intelligent early warning frame for enterprise financial control based on an intelligent mathematical model. In addition, this paper combines the K-means clustering algorithm to design a financial approval process integrity control early warning method to warn the integrity of the financial approval process. Finally, this paper presents the early warning of financial standard compliance control based on the C4.5 decision tree algorithm. The experimental research shows that the enterprise financial early warning model based on the intelligent mathematical model proposed in this paper can play an important role in the enterprise financial management and effectively improve the ability of the enterprise to cope with financial risks.
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Valente, Isabel, Luís F. Ramos, Kevin Vasquez, Paulo Guimarães, and Paulo B. Lourenço. "Non-Destructive Tests for the Structural Assessment of a Historical Bridge over the Tua River." Key Engineering Materials 569-570 (July 2013): 390–97. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.390.
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Paradela Bridge is a metallic bridge located along the bank of the Tua River in northern Portugal. While the bridge is not currently in service, its structure is representative of many metallic truss structures built across the continent between the XIX and the XX century. Tua Line belongs to the Douro area that UNESCO recently declared as world heritage. This study acquires its importance since it might serve as an insight for the study of many other similar structures all over the country. This paper comprises a historic investigation of archived documents, an on-site survey to evaluate its present conditions, a dynamic testing and the construction and calibration of numerical models in finite element analysis (FEA) software, structural assessment and capacity rating estimation. The purpose of constructing numerical models was to evaluate the suitability of the bridge under the original loading and in accordance to modern design standards. The historical research revealed that the truss bridge was designed as a simply supported element and that a series of hand calculations were carried out on individual structural elements (e.g. main trusses, stringers and floor beams). Furthermore, a dynamic test was conducted in order to identify the global dynamic properties of the structure and to calibrate numerical models that ensure reliability and representativeness. FE models served through the structural assessment of the bridge in accordance with modern design codes and to estimate the safety of the bridge. Likewise, a nonlinear failure analysis was also conducted in order to estimate the capacity rate of the bridge and the likely failure modes.
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Ginzburg, Alexander. "LE IM: Living Environment Information Modelling." MATEC Web of Conferences 193 (2018): 05030. http://dx.doi.org/10.1051/matecconf/201819305030.
Повний текст джерелаАнотація:
The article deals with the information models in construction. The models of different levels are reviewed: flat 2D drawings, 3D volume models, models including time indicators - 4D, models supplemented by financial indicators - 5D, models containing information on a wide range of resource and other indicators – N-D. The importance of an integrated approach to the formation of the information model of the building - BIM was noted. To date, BIM-technologies are used only at the design stage and partially at the construction stage. However, the greatest return can be obtained from the operational phase. The author proposes the introduction of the concept of an information model of the building life cycle - BLC IM. The analysis of the reasons predetermining the problems of mass introduction of BLC IM into construction practice is carried out. The contradictory nature of the interests of the participants in the construction process, the lack of common goals does not allow them to form and use a unified information model. The mathematical description of the information model of the building object is presented.
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Саражинский, А. С., and С. В. Ефрюшин. "ANALYSIS OF CALCULATION MODELS OF PLATFORM JOINTS WHEN DESIGNING INDUSTRIALIZED CONSTRUCTION WITH APARTMENTS MODULES." Stroitelʹnaâ mehanika i konstrukcii, no. 1(32) (June 16, 2022): 69–81. http://dx.doi.org/10.36622/vstu.2022.32.1.006.
Повний текст джерелаАнотація:
Анализ литературы, посвященной расчетным моделям объемно-блочных конструктивных систем, показывает, что по сравнению с работами по расчету панельных зданий, исследований по объемно-блочным зданиям недостаточно, поэтому работы в этом направлении имеют свою актуальность. Для того чтобы проектировать и выполнять прочностные расчеты объемно-блочных конструктивных систем, исследовать различные варианты объемно-планировочных и конструктивных решений, нужно иметь хорошо обоснованную расчетную математическую модель. Расчетную модель объемно-блочных конструктивных систем необходимо начать рассматривать с модели платформенного стыка, через который объемные блоки опираются друг на друга по высоте здания. В работе приводятся практические выводы и рекомендации по выбору расчетной модели платформенного стыка объемно-блочных конструктивных систем. Опыт проделанных расчётов может быть использован при проектировании объемно-блочных зданий. An analysis of the literature on the calculation models of volume-block structural systems shows that, compared with the work on the calculation of panel buildings, research on volumetric-block buildings is not enough, therefore, work in this direction is relevant. In order to design and perform strength calculations of volume-block structural systems, to explore various options for space-planning and design solutions, it is necessary to have a well-founded computational mathematical model. The design model of volume-block structural systems should be considered from the model of the platform joint, through which the volume blocks rest on each other along the height of the building. The paper provides practical conclusions and recommendations for choosing a design model for a platform joint of bulk-block structural systems. The experience of the performed calculations can be used in the design of volume-block buildings.
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KOVTUN, IGOR, JULIY BOIKO, LESYA KARPOVA, and VOLODYMYR PETRYSHYN. "INFLUENCE OF DESIGN AND TECHNOLOGY FACTORS ON ENSURING STABILITY PARAMETERS FOR RADIO-ELECTRONIC DEVICES." Herald of Khmelnytskyi National University 301, no. 5 (October 2021): 160–65. http://dx.doi.org/10.31891/2307-5732-2021-301-5-160-165.
Повний текст джерелаАнотація:
The material presented in the article contains the results theoretical research, in terms of research and implementation in production technological design methods for the operational construction of mathematical models’ assembly processes of electronic devices and the choice of optimal parameters of their parts. This technique is based on the statistical principles of active planned experiment, which are currently widely used in various fields of science and technology. The use of these principles, in contrast to traditional methods of conducting a passive experiment and processing the results obtained in this case, allows to drastically reduce the time and material costs for a reliable mathematical description of complex physical laws that underlie the processes of compiling modern electronic devices and choosing the parameters of the parts included in them. The proposed methodology provides for a modification of the principles of an active planned experiment, which can be used when working with electronic devices consisting of independent (explained in the text of the article), in a certain sense, functional units or cascades, the mutual influence of which on the operation of the device is known in advance. It allows you to create such statistically determined models of radio electronic devices that can significantly reduce the labour intensity and economic costs necessary for setting up an experiment. The selection of primary factors included in an active planned experiment should be based on a thorough analysis of the principles of operation and design features of assembly objects, the physical essence of a particular technological process, as well as a study of the experience of mass production and the results of previous research in the relevant areas of technology. The success of the entire active planned experiment and the possibility of effective use of the obtained mathematical model in the design and technological preparation of production almost completely depend on the successful choice of factors. The purpose of the article is related to the development of a technique for the rapid construction of mathematical models of the assembly processes of radio-electronic devices and the selection of the optimal parameters of their parts.
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Deng, Tao. "Construction and Analysis of Double Helix for Triangular Bipyramid and Pentangular Bipyramid." Computational and Mathematical Methods in Medicine 2020 (May 14, 2020): 1–9. http://dx.doi.org/10.1155/2020/5609593.
Повний текст джерелаАнотація:
DNA cages can be joined together to make larger 3D nanostructures on which molecular electronic circuits and tiny containers are built for drug delivery. The mathematical models for these promising nanomaterials play important roles in clarifying their assembly mechanism and understanding their structures. In this study, we propose a mathematical and computer method to construct permissible topological structures with double-helical edges for a triangular bipyramid and pentangular bipyramid. Furthermore, we remove the same topological links, without eliminating the nonrepeated ones for a triangular bipyramid and pentangular bipyramid. By analyzing characteristics of these unique links, some self-assembly and statistic rules are discussed. This study may obtain some new insights into the DNA assembly from the viewpoint of mathematics, promoting the comprehending and design efficiency of DNA polyhedra with required topological structures.
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Guo, Hu, Li Xuan, Chen Hao, Faris Kateb, and Adel Ali Yassin Alzyoud. "Research on the mathematical model construction of art and ideology in visual communication design teaching." Applied Mathematics and Nonlinear Sciences 6, no. 2 (July 1, 2021): 517–24. http://dx.doi.org/10.2478/amns.2021.2.00110.
Повний текст джерелаАнотація:
Abstract Aims To enhance the teaching quality in the field of visual communication design and make students to improve in all aspects of moral, intellectual and physical development, strengthen their ideological education, improve their ideological quality and strengthen their understanding of visual communication design art. Methods By using mathematical methods to construct models, and making appropriate selection of the literature method, practical teaching method and investigation method, the author made a comprehensive study on the artistic problems in art teaching from the aspects of definition, function, characteristics and students’ ideological quality, and discusses potential solutions. Results It had a positive effect on teachers and on their teaching methods, so that they have a better understanding of their teaching work, to motivate themselves towards their goals, make the classroom teaching vivid and improve the teaching efficiency. Conclusion The art of teaching visual communication has a close relationship with the strength and quality of people's thoughts; so, we must strengthen the artistic quality of visual communication design education, to improve students’ ideological quality and the art of teaching visual communication design. In our model, the motivation of teachers to create and sustain interest in students studying visual communication design is stronger when the imagination of ideological content is broad, and when the artistry is positive for right triangle and thoughtful for backward right triangle. The construction of the model is like a regular triangle and an inverted triangle combined to form a regular rectangle mathematical model. It will make visual communication design teaching like Mona Lisa so that people linger.
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Grigorov, Otto, Evgenij Druzhynin, Galina Anishchenko, Marjana Strizhak, and Vsevolod Strizhak. "Analysis of Various Approaches to Modeling of Dynamics of Lifting-Transport Vehicles." International Journal of Engineering & Technology 7, no. 4.3 (September 15, 2018): 64. http://dx.doi.org/10.14419/ijet.v7i4.3.19553.
Повний текст джерелаАнотація:
The results of analytical and numerical modeling of dynamic characteristics of linear and non-linear mathematical models of the “trolley-load” system of bridge and container cranes are presented. KiDyM software complex is used for numerical modeling, which, based on the use of the apparatus of structural matrices and the built-in computer algebra system, allows the construction of ordinary differential equations of motion of the class of systems under consideration at the analytical level. Recommendations on the possible use of the considered mathematical models of the “trolley-load” system in various regular and forced operation modes of bridge and container cranes are given on the basis of the analysis. The ratio of the results of calculations for various design models of regular and forced operation of the bridge crane has been established. The magnitude of the distribution of the maximum values of the dynamic characteristics of motion of the container crane has been designed by calculating the forced operation mode using various mathematical models.
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Xu, Kaijie, Hanyu E, Yinghui Quan, Ye Cui, and Weike Nie. "From granulation-degranulation mechanisms to fuzzy rule-based models: Augmentation of granular-based models with a double fuzzy clustering." Journal of Intelligent & Fuzzy Systems 40, no. 6 (June 21, 2021): 12243–52. http://dx.doi.org/10.3233/jifs-210336.
Повний текст джерелаАнотація:
In this study, we develop a novel clustering with double fuzzy factors to enhance the performance of the granulation-degranulation mechanism, with which a fuzzy rule-based model is designed and demonstrated to be an enhanced one. The essence of the developed scheme is to optimize the construction of the information granules so as to eventually improve the performance of the fuzzy rule-based models. In the design process, a prototype matrix is defined to express the Fuzzy C-Means based granulation-degranulation mechanism in a clear manner. We assume that the dataset degranulated from the formed information granules is equal to the original numerical dataset. Then, a clustering method with double fuzzy factors is derived. We also present a detailed mathematical proof for the proposed approach. Subsequently, on the basis of the enhanced version of the granulation-degranulation mechanism, we design a granular fuzzy model. The whole design is mainly focused on an efficient application of the fuzzy clustering to build information granules used in fuzzy rule-based models. Comprehensive experimental studies demonstrate the performance of the proposed scheme.
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Popova, Diana, Denis Popov, and Nikita Samoylenko. "INVESTIGATION OF THE GRID MODEL AND TURBULENCE MODEL PARAMETERS INFLUENCE ON QUALITY OF TURBINE ROTOR BLADE TIP CLEARANCE AREA AERODYNAMIC PROCESSES MODELING." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 66 (2021): 67–78. http://dx.doi.org/10.15593/2224-9982/2021.66.07.
Повний текст джерелаАнотація:
Aerodynamic processes mathematical modeling is carried out using numerical methods. Now the level of development of software numerical methods of three-dimensional gas-dynamic modeling of processes in turbomachinery makes it possible to determine with high accuracy the main characteristics of units at the design stage. It significantly reduces the time and cost of production. This article proposes a methodology for installation and improving the mathematical and grid model of HPT rotor blade to improve the quality of three-dimensional modeling. Aerodynamic processes mathematical modeling in aircraft turbojet engine blade rows is carried out using numerical methods. Grid model settings and turbulence model significantly affect the results qualitative characteristics and the calculations duration. This article proposes a methodology for grid model constructing based on local intense vortex formation and flow mixing places thickening. The influence of the grid and turbulence models parameters are estimated on the kinetic energy losses amount and secondary flows structure. The design model includes the building geometric model, preparation of the grid model and description of the turbulence model. Influence of grid and BSL and SST turbulence models on results of turbine blade aerodynamic calculation is considered in this article. Basic recommendations for the construction of mathematical and grid models in the ANSYS for uncooled rotor blades have been developed.
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Miconi, D. "Vibration Control in Industrial Plant: A Methodological Approach." Journal of Vibration and Acoustics 109, no. 4 (October 1, 1987): 335–42. http://dx.doi.org/10.1115/1.3269450.
Повний текст джерелаАнотація:
The present paper is a report on the construction of nomograms to ascertain the domain of elastic-inertial-damping characteristics required in vibrating machine-foundation systems, in order to ensure that ergonomic and other technical constraints are complied with. Nomograms, which are the graphic representation of mathematical models in nondimensional form, prove to be an effective instrument for orientation in the design stage.
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An, Ai Qin, Ming Hua Pang, Lian Feng Zhang, and Yong Fang Nie. "The Studying of Logix Gear Construction Principle and Parameter Simulation Using Matlab." Applied Mechanics and Materials 80-81 (July 2011): 1118–22. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.1118.
Повний текст джерелаАнотація:
Logix gear is a new gear based on new tooth profile theory. On the primary, the forming principle of the logix gear tooth profile is analysed. Then the tooth profile curve equations of logix gear are derived, and their center coordinate equations of base circle are given. According these equations, their curves are simulated using Matlab, which are corresponded to practical tests. The study lays a foundation of computer aided design of the logix gears. And the study can be used to perfect mathematical models and to optimize manufacturing methods.