scholarly journals DIGITAL MODEL OF SURVIVABILITY TO SUPPORT THE LIFE CYCLE OF BAR STRUCTURES

Author(s):  
Сергей Владимирович Доронин ◽  
Юлия Федоровна Филиппова

Рассматриваются структура и содержание цифровых моделей живучести на примере стержневых конструкциях. Разработаны функциональная и процедурная модели анализа живучести, выполнен численный анализ повреждаемого объекта с оценкой показателей живучести. Специфической чертой цифровых моделей живучести является то, что в основу дискретизации пространства входных данных и результатов предлагаются сценарии накопления повреждений в стержневых конструкциях. The structure and content of digital models of survivability are considered on the example of bar structures. Functional and procedural models of survivability analysis were developed, numerical analysis of the damaged object was carried out with an assessment of survivability indicators. A specific feature of digital survivability models is that scenarios of damage accumulation in bar structures are proposed as the basis for sampling the space of input data and results.

2021 ◽  
Vol 4 (30) ◽  
pp. 114-121
Author(s):  
N. N. Maiorov ◽  
◽  
A. A. Dobrovolskaya ◽  
V. E. Taratun ◽  
◽  
...  

The article solves the problem of finding a solution for building a digital model of the transport network or transport infrastructure object. On the basis of the analysis, the limitation of available solutions is given and the limited state of implementation of digital models in new modernizations of transport systems is fixed. The paper provides a general scheme of using documentation of the state of the transport system, nodes and elements and considers examples based on real transport systems. The paper examines the basic requirements for digital transport models and proposes a solution based on the use of unmanned aircraft systems. A model of formation of flight task variants is proposed and, as a proof of relevance of the research, the results of a real experiment are given. The task of modernizing a segment of the transport network of the city, the identification of the state of the site on the basis of data from unmanned aircraft system is considered. The article presents a solution to the problem, which has a high quality of building a digital model and the possibility of integration into other information systems for monitoring the condition and forecasting of development.


2019 ◽  
Vol 137 ◽  
pp. 01004
Author(s):  
Sebastian Werle ◽  
Szymon Sobek ◽  
Zuzanna Kaczor ◽  
Łukasz Ziółkowski ◽  
Zbigniew Buliński ◽  
...  

Paper present the experimental and numerical analysis of biomass photopyrolysis process. The experimental tests is performed on the solar pyrolysis installation, designed in Institute of Thermal Technology, Gliwice. It consist of the copper reactor powered by artificial light simulating sun. The paper shows the result of the solar pyrolysis of wood. The yield of the main fraction as a function of the process temperature is presented. Additionally the gas composition is determined. The numerical model is prepared in the Ansys Fluent 18.2 software, which allow at the same time for capturing geometry of the real system and easy change of input data. The results indicate that both the product yields (liquid, solid and gaseous) and gas components shares are strongly influenced by pyrolysis parameters and feedstock composition.


2019 ◽  
Vol 946 ◽  
pp. 775-781
Author(s):  
E.V. Timakov ◽  
F.S. Dubinskiy

In this paper, the ABAQUS is adopted to carry on numerical simulation on straightening process of R65 heavy rail. The straightening process has been simulated here using the FE package of ABAQUS. All the input data were extracted from experimental tests according to tail manufacturing. Moreover, initial camber of the rail was measured after hot rolling and cooling process.


2017 ◽  
Vol 41 (1) ◽  
pp. 26 ◽  
Author(s):  
Forbes McGain ◽  
Graham Moore ◽  
Jim Black

Objective The aim of the present study was to quantify hospital steam steriliser resource consumption to provide baseline environmental data and identify possible efficiency gains. We sought to find the amount of steriliser electricity and water used for active cycles and for idling (standby), and the relationship between the electricity and water consumption and the mass and type of items sterilised. Methods We logged a hospital steam steriliser’s electricity and water meters every 5 min for up to 1 year. We obtained details of all active cycles (standard 134°C and accessory or ‘test’ cycles), recording item masses and types. Relationships were investigated for both the weight and type of items sterilised with electricity and water consumption. Results Over 304 days there were 2173 active cycles, including 1343 standard 134°C cycles that had an average load mass of 21.2 kg, with 32% of cycles <15 kg. Electricity used for active cycles was 32 652 kWh (60% of total), whereas the water used was 1 243 495 L (79%). Standby used 21 457 kWh (40%) electricity and 329 200 L (21%) water. Total electricity and water consumption per mass sterilised was 1.9 kWh kg–1 and 58 L kg–1, respectively. The linear regression model predicting electricity use was: kWh = 15.7+ 0.14 × mass (in kg; R2 = 0.58, P < 0.01). Models for water and item type were poor. Electricity and water use fell from 3 kWh kg–1 and 200 L kg–1, respectively, for 5-kg loads to 0.5 kWh kg–1 and 20 L kg–1, respectively, for 40-kg loads. Conclusions Considerable electricity and water use occurred during standby, load mass was only moderately predictive of electricity consumption and light loads were common yet inefficient. The findings of the present study are a baseline for steam sterilisation’s environmental footprint and identify areas to improve efficiencies. What is known about the topic? There is increasing interest in the environmental effects of healthcare. Life cycle assessment (‘cradle to grave’) provides a scientific method of analysing environmental effects. Although data of the effects of steam sterilisation are integral to the life cycles of reusable items and procedures using such items, there are few data available. Further, there is scant information regarding the efficiency of the long-term in-hospital use of sterilisers. What does this paper add? We quantified, for the first time, long-term electricity and water use of a hospital steam steriliser. We provide useful input data for future life cycle assessments of all reusable, steam-sterilised equipment. Further, we identified opportunities for improved steriliser efficiencies, including rotating off idle sterilisers and reducing the number of light steriliser loads. Finally, others could use our methods to examine steam sterilisers and many other energy-intensive items of hospital equipment. What are the implications for practitioners? We provide useful input data for all researchers examining the environmental footprint of reusable hospital equipment and procedures using such equipment. As a result of the present study, staff in the hospital sterile supply department have reduced steam steriliser electricity and water use considerably without impeding sterilisation throughput (and reduced time inefficiencies). Many other hospitals could benefit from similar methods to improve steam steriliser and other hospital equipment efficiencies.


2020 ◽  
Vol 35 ◽  
pp. 02007
Author(s):  
Elena M. Razinkina

The article presents main approaches to building a model of a digital university based on Peter the Great St. Petersburg Polytechnic University, a functional model called Digital University and a short description of its base elements: creation of a digital platform, development of a system of digital models of educational programs and a scientific product, digitalization of the life cycle of educational and scientific products and services of a university, methodological and legal support of the Digital University model.


2020 ◽  
Vol 28 (1) ◽  
pp. 20-24
Author(s):  
Martin Jamnický ◽  
Roman Rabenseifer

AbstractThis article proposes to contribute to the discussion on environmental product declarations for buildings. Using a simple life-cycle analysis of a low-energy detached house and CO2-equivalent emissions as a comparative unit, the case study presented illustrates the problems with the initial input data related to embodied energy and a definition of the criteria for an assessment of the environmental quality of buildings. The actual case study compares the expected energy demand of a detached house in the course of its service life and the energy input (embodied energy) necessary for its assembly and for the manufacture of the individual building products. The operation of the building during its service life is described using a computer-aided building performance simulation. The input data related to the embodied energy are based on information from classical works on life cycle analyses. In addition, the article discusses the limits of building envelope improvements in terms of the thickness of thermal insulation and also stresses the increasing significance of embodied energy in the environmental assessment of buildings.


2019 ◽  
Vol 65 (2) ◽  
pp. 163-179 ◽  
Author(s):  
E. Plebankiewicz ◽  
K. Zima ◽  
D. Wieczorek

Abstract The model for estimating the whole life costs of the building life cycle that allows the quantification of the risk addition lets the investor to compare buildings at the initial stage of planning a construction project in terms of the following economic criteria: life cycle costs (LCC), whole life costs (WLC), life cycle equivalent annual costs (LCEAC) and cost addition for risk (ΔRLCC). The subsequent stages of the model development have been described in numerous publications of the authors, while the aim of this paper is to check the accuracy of the model in the case of changing the parameters that may affect the results of calculations. The scope of the study includes: comparison of the results generated by the model with the solutions obtained in the life cycle net present value method (LCNPV) for time and financial input data, not burdened with the risk effect; the analysis of the variability of results due to changes in input data; analysis of the variability of results as a consequence of changing the sets of membership functions for input data and methods for defuzzification the result.


2018 ◽  
Vol 7 (3.2) ◽  
pp. 584 ◽  
Author(s):  
Denys Chernyshev ◽  
Iryna Ivakhnenko ◽  
Maryna Klymchuk

The article considers the modern practice of urban innovation, based on the principles of biosphere compatibility. The project solution of providing organizational and technological reliability of construction from the point of view of the possibility of realizing the functions of a biosphere compatibility city and introducing innovative constructive and architectural and planning solutions is analyzed. In relation to the construction project, the formalization of the methodology for calculating the indicators of the biosphere compatibility of cities and settlements, the quantitative indicators of the implementation of the functions of the city are determined. The obtained results of numerical analysis of the realization of city functions can predict the development of urban areal, assess the comfort and safety of the urban environment from the standpoint of biosphere compatibility of construction objects in order to harmonize the characteristics of the life cycle of these projects with the characteristics of the microenvironment of their implementation. The basis of such tools is: multifactorial, multicomponent modeling and multicriterial selection of alternatives for building construction for projects, provided that the level of biosphere compatibility is used as the leading analytical coordinate of such simulation. These models, implemented in the format of modern construction, will serve as a basis for organizational and technological and environmental expertise of projects.  


Author(s):  
Aryan Shahabian ◽  
Alireza Fadai ◽  
Thomas Peruzzi

Today, even in developed countries, performing life-cycle assessment (LCA) is still a challenging and complex process, mixed with the possibility of significant errors—namely due to unreliable input data derived from unrepresentative sampling. Some scientific texts illustrate the so-called Smart World—where such errors are minimized via the exchange of information between everything globally. This may sound contradictory to the fact that now almost half the world population do not even have internet access. However, this chapter shows—by reasoning, review, and synthesis of the literature, theories, and data—that the emergence of the Smart World is plausible. Yet, it will not necessarily be sustainable, unless “smartness” is (re)defined in line with the Sustainable Development Goals. Otherwise, also, LCA might become obsolete, or its goals may transmute to non-sustainable ones. Focusing on examples from the construction industry and their interactions with other sectors, some shortcuts are also suggested to facilitate innovations and development of LCA and decision-making procedures.


Author(s):  
S.U. Uvaysov ◽  
V.V. Chernoverskaya ◽  
N.N. Kalinin ◽  
A.A. Markin

The active development of unmanned vehicles, in control systems of which most of the currently created artificial intelligence technologies are used, from machine vision systems to decision-making in multi-criteria control tasks, has led to the emergence of such vehicles on public roads and, in fact, has become an objective reality of ours. life. In such a situation, the person driving needs additional information to drive safely. Currently, the road infrastructure is dynamically developing, forming into a developed distributed telecommunication system with accompanying services. And now it is increasingly associated with the concept of "intelligent transport system" (ITS), to which are connected automotive equipment subsystems, wireless communication subsystems, roadside equipment subsystems and a global navigation satellite system module. Unmanned vehicles, which are integrated into the road environment, form a single telecommunication system for controlling the movement of vehicles with it. Wireless technologies and digital models of road infrastructure are important components of such a system. The information technology concept, which implies the integration of computing resources into physical entities, in particular autonomous robots and unmanned vehicles, is called the concept of cyber-physical systems. The computational component in it is distributed throughout the system. The study of the possibility of constructing digital models of roads and road infrastructure with their subsequent intrasystem transfer between interacting objects is undoubtedly of considerable interest. At the research stage of the implementation of such a technology, it is important to analyze the possibility of building and deploying modern ITS, highlight the main problems associated with the visualization of digital ITS models, and propose ways to solve the tasks. As part of the study, an overview of modern wireless technologies and communication standards with the prospect of their application in the infrastructure of the road environment is given, foreign experience of deploying such systems, their features and limitations, is considered. The functional structure of the intelligent transport system is proposed. The results of modeling the road network (creating a digital model of roads) and the practical implementation of software for compiling local maps are presented. The developed software took into account the shortcomings of specialized products on the market, and also implemented the possibility of converting a digital model of roads into the MAPEM format. After preprocessing MAPEM files, they are placed on the server of the intelligent transport system, from where they are then sent via RSU. RSUs start broadcasting this information, and it goes to the unmanned vehicle, which, in turn, processes the received file and waits for a request to move. Upon receipt of such a request, it builds the trajectory of the path and starts moving. The techniques obtained as a result of the research were implemented and applied at the test site.


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