scholarly journals Design, construction and operation features of high-rise structures

2018 ◽  
Vol 33 ◽  
pp. 02015
Author(s):  
Alexey Mylnik ◽  
Vladimir Mylnik ◽  
Elena Zubeeva ◽  
Olga Mukhamedzhanova
Keyword(s):  
Integrated Approach ◽  
Operating Conditions ◽  
High Rise ◽  
Design Loads ◽  
Under Construction ◽  
Functional Purpose ◽  
Design Construction

The article considers design, construction and operation features of high-rise facilities. The analysis of various situations, that come from improper designing, construction and operation of unique facilities, is carried out. The integrated approach is suggested, when the problems of choosing acceptable constructional solutions related to the functional purpose, architectural solutions, methods of manufacturing and installation, operating conditions for unique buildings and structures are being tackled. A number of main causes for the emergency destruction of objects under construction and operation is considered. A number of measures are proposed on the basis of factor classification in order to efficiently prevent the situations, when various negative options of design loads and emergency impacts occur.

ANALYSIS AND ASSESSMENT OF METHODS AND MEANS OF DESTRUCTING INFORMATION FROM MAGNETIC MEDIA AS AN ELEMENT OF MODERN INFORMATION SECURITY

2019 ◽  
pp. 99-112 ◽  
Author(s):  
O. Semenenko ◽  
Y. Dobrovolsky ◽  
V. Koverga ◽  
O. Sechenev
Keyword(s):  
Information Security ◽  
Information Exchange ◽  
Integrated Approach ◽  
Operating Conditions ◽  
Security Requirements ◽  
Magnetic Media ◽  
Security Technologies ◽  
Analysis Of Means ◽  
Complex Development ◽  
Modern Information

Evolution of security technologies shows that only the concept of an integrated approach to information security can provide modern information security requirements. A comprehensive approach means the complex development of all the necessary methods and means of information protection. Today, the information exchange and information systems in the Ministry of Defense of Ukraine have certain means and approaches to the destruction of information, but each of them has different estimates of the effectiveness of their use, as well as different cost of their purchase and use. Therefore, the main purpose of the article is to carry out a comprehensive analysis of means of destroying confidential information of methods of its destruction in order to formulate practical recommendations for choosing the most effective and economically feasible for the Ministry of Defense of Ukraine. The perfection of methods and means of destroying information from magnetic media is an important element of modern information security. The results of the analysis carried out in the article are the disclosure of the main features of modern devices for the elimination of magnetic records, as well as the ability to formulate a list of basic requirements for modern devices for the destruction of information from magnetic media. Today, technical means of information security, in particular, the elimination of information on magnetic media, are constantly being improved, absorbing the latest advances in modern security technologies. Their model range, which takes into account the diversity of customer requirements, such as the type of energy supply, the level of mobility, reliability and operating conditions, expands. All this determines the relevance of research topics in this direction in the future.

Tangguh Project: Multidisciplinary and Challenging Design of a Novel Concept of Buckle Initiator

2021 ◽  
Author(s):  
Formentini Federico ◽  
Luigi Foschi ◽  
Filippo Guidi ◽  
Ester Iannucci ◽  
Lorenzo Marchionni ◽  
...  
Keyword(s):  
Soil Liquefaction ◽  
Operating Conditions ◽  
Contributing Factors ◽  
Operating Life ◽  
Foundation Design ◽  
Production Pipeline ◽  
Offshore Pipeline ◽  
Design Loads ◽  
Pipeline Route ◽  
Novel Concept

Abstract This paper is based on the experience made during the design and installation of an offshore pipeline recently completed in Indonesia, where a 24” subsea production pipeline (16km long in 70m water depth) was found susceptible during design to lateral buckling. To limit the development of excessive deformation within the acceptance criteria, a mitigation strategy based on interacting planned buckles has been adopted installing three Buckle Initiators (BI) along the pipeline route. Buckling is a well understood phenomenon. However, this project was characterized by major uncertainties mainly driven by soil characterization, soil-pipe interaction, seabed mobility and soil liquefaction. These uncertainties have played a key role in the in-service buckling design. A lot of engineering efforts have been spent to go through the screening between alternative concepts, the validation of the chosen solution and its detailed engineering phase. This paper discusses the main contributing factors and how the uncertainties have been tackled. The Buckle Initiators are quite large and heavy structures with two main bars: the first ramp has an inclination equal to 30° and the pipeline has been laid on it; a second horizontal ramp was used as sleeper to accommodate the development of the lateral buckle during the operating life. A rotating arm was also used to restrict the pipeline lay corridor on the inclined ramp guaranteeing a combined horizontal and vertical out-of-straightness in the as-laid configuration. The rotating arm has been released as soon as the pipeline passed the BI permitting the pipeline to slide freely over the two BI ramps. The foundation of the Buckle Initiator has a footprint surface of about 60m2 guaranteeing its stability for different soil types characterizing the three installation areas. This more complex solution was preferred with respect to a typical sleeper to increase the robustness of the system in terms of buckle mobilization. The design of the Buckle Initiator was a multidisciplinary activity where many novel concepts were developed and many issues were faced (i.e. pipeline laying on an inclined sleeper, anti-scouring system, foundation design, etc.). The Buckle Initiator design was focused on structural calculations against design loads expected during temporary and operating conditions, geotechnical verifications, installation analysis, pipeline configuration and fatigue assessment. This paper presents all main engineering aspects faced during design and first feedbacks from field after the pipeline installation.

Use of an Integrated Approach for Analysis and Design of Turbocharged Internal Combustion Engine

2021 ◽  
Author(s):  
Thiago Ebel ◽  
Mark Anderson ◽  
Parth Pandya ◽  
Mat Perchanok ◽  
Nick Tiney ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Combustion Engine ◽  
Early Stage ◽  
Pressure Ratio ◽  
Integrated Approach ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Dynamics Simulation ◽  
Analysis And Design ◽  
Performance Requirements

Abstract When developing a turbocharged internal combustion engine, the choice of turbocharger is usually based on designer experience and existing hardware. However, proper turbocharger design relies on matching the compressor and turbine performance to the engine requirements so that parameters such as boost and back pressure, compressor pressure ratio, and turbine inlet temperatures meet the needs of the engine without exceeding its allowable operating envelope. Therefore, the ultimate measure of a successful turbocharger design is how well it is matched to an engine across various operating conditions. This, in turn, determines whether a new turbocharger is required, or an existing solution can be used. When existing turbocharger solutions are not viable, the engine designer is at a loss on how to define a new turbocharger that meets the desired performance requirements. A common approach in industry has been to scale the performance of an existing turbocharger (compressor and turbine maps) and take these requirements for Original Equipment Manufacturers to possibly match it with a real machine. However, the assumptions made in a basic scaling process are quite simplistic and generally not satisfactory in this situation. A better approach would be to use a validated meanline model for a compressor and turbine instead, allowing to perform an actual preliminary design of such components. Such approach allows to link the engine performance requirements in a very early stage of te component design project and it guides the designer for the design decisions, such as rotor size, variable geometry nozzles, diameter, or shroud trims and others. Therefore, a feasible solution is more likely with design less iterations. This paper describes a methodology for an integrated approach to design and analyze a turbocharged internal combustion engine using commercially available state-of-the-art 1D gas dynamics simulation tool linked to two powerful turbomachinery meanline programs. The outputs of this analysis are detailed performance data of the engine and turbocharger at different engine operating conditions. Two case studies are then presented for a 10-liter diesel truck engine. The first study demonstrates how the programs are used to evaluate an existing engine and reverse engineer an existing turbocharger based only on the available performance maps. Then a second study is done using a similar approach but redesigning a new turbocharger (based on the reverse engineered one) for an increased torque output of the same engine.

scholarly journals Conducting experimental investigations of wind influence on high-rise constructions

2018 ◽  
Vol 33 ◽  
pp. 02067 ◽  
Author(s):  
Olga I. Poddaeva ◽  
Anastasia N. Fedosova ◽  
Pavel S. Churin ◽  
Julia S. Gribach
Keyword(s):  
Aerodynamic Drag ◽  
Experimental Investigations ◽  
Building Structures ◽  
High Rise ◽  
Aerodynamic Pressure ◽  
Stage Of Development ◽  
Wind Influence ◽  
Under Construction ◽  
Building Designs ◽  
The Impact

The design of buildings with a height of more than 100 meters is accompanied by strict control in determining the external loads and the subsequent calculation of building structures, which is due to the uniqueness of these facilities. An important factor, the impact of which must be carefully studied at the stage of development of project documentation, is the wind. This work is devoted to the problem of studying the wind impact on buildings above 100 meters. In the article the technique of carrying out of experimental researches of wind influence on high-rise buildings and constructions, developed in the Educational-research-and-production laboratory on aerodynamic and aeroacoustic tests of building designs of NRU MGSU is presented. The publication contains a description of the main stages of the implementation of wind tunnel tests. The article presents the approbation of the methodology, based on the presented algorithm, on the example of a high-rise building under construction. This paper reflects the key requirements that are established at different stages of performing wind impact studies, as well as the results obtained, including the average values of the aerodynamic pressure coefficients, total forces and aerodynamic drag coefficients. Based on the results of the work, conclusions are presented.

scholarly journals Modern energy efficient technologies of high-rise construction

2018 ◽  
Vol 33 ◽  
pp. 02047 ◽  
Author(s):  
Inessa Lukmanova ◽  
Roman Golov
Keyword(s):  
Energy Saving ◽  
Energy Efficient ◽  
Residential Buildings ◽  
Unified Model ◽  
High Rise ◽  
Design Construction

The paper analyzes modern energy-efficient technologies, both being applied, and only introduced into the application in the construction of high-rise residential buildings. All technologies are systematized by the authors as part of a unified model of "Arrows of Energy-Efficient Technologies", which imply performing energy-saving measures in the design, construction and operation of buildings.

scholarly journals Monitoring and Analysis of Dynamic Characteristics of Super High-rise Buildings using GB-RAR: A Case Study of the WGC under Construction, China

2020 ◽  
Vol 10 (3) ◽  
pp. 808 ◽  
Author(s):  
Lv Zhou ◽  
Jiming Guo ◽  
Xuelin Wen ◽  
Jun Ma ◽  
Fei Yang ◽  
...  
Keyword(s):  
Wavelet Analysis ◽  
Dynamic Characteristics ◽  
Horizontal Displacement ◽  
Dynamic Monitoring ◽  
High Rise ◽  
The North ◽  
Study Results ◽  
Under Construction ◽  
East West

Accurate dynamic characteristics of super high-rise buildings serve as a guide in their construction and operation. Ground-based real aperture radar (GB-RAR) techniques have been applied in monitoring and analyzing the dynamic characteristics of different buildings, but only few studies have utilized them to derive the dynamic characteristics of super high-rise buildings, especially those higher than 400 m and under construction. In this study, we proposed a set of technical methods for monitoring and analyzing the dynamic characteristics of super high-rise buildings based on GB-RAR and wavelet analysis. A case study was conducted on the monitoring and analysis of the dynamic characteristics of the Wuhan Greenland Center (WGC) under construction (5–7 July 2017) with a 636 m design height. Displacement time series was accurately derived through GB-RAR and wavelet analysis, and the accuracy reached the submillimeter level. The maximum horizontal displacement amplitudes at the top of the building in the north–south and east–west directions were 18.84 and 15.94 mm, respectively. The roof displacement trajectory of the WGC was clearly identified. A certain negative correlation between the temperature and displacement changes at the roof of the building was identified. Study results demonstrate that the proposed method is effective for the dynamic monitoring and analysis of super high-rise buildings with noninvasive and nondestructive characteristics.

scholarly journals Some limitations of modal analysis in seismic design

1969 ◽  
Vol 2 (3) ◽  
pp. 284-288
Author(s):  
R. Shepherd
Keyword(s):  
Seismic Design ◽  
Response Spectrum ◽  
Individual Member ◽  
Square Root ◽  
High Rise ◽  
Earthquake Resistant Design ◽  
Recent Computer ◽  
Computer Analyses ◽  
Design Loads ◽  
The Individual

In the normal-mode, response-spectrum approach to earthquake resistant design of multistorey buildings the extended elastic seismic design loads are frequently calculated as the square root of the sum of the squares of the modal responses. The individual member forces are then determined using these seismic design loads. Previous research workers have examined the limitations of this technique and it is accepted as being generally applicable in practical design procedures. Recent computer analyses of projected New Zealand high-rise buildings have illustrated two conditions in which the “square root of the sum of the modal responses squared” rule is inapplicable. In this note these situations are described and suggestions are made of an alternative approach which may be adopted when deriving design loads in such cases.

Corpus of Patriarch Nikon’s Inscriptions on “Sacred Things”: Questions of Textology and Architectural and Artistic Design

2021 ◽  
pp. 479-547
Author(s):  
Galina M. Zelenskaya ◽  
◽  
Svetlana K. Sevastyanova ◽  
◽  
Keyword(s):  
Integrated Approach ◽  
New Jerusalem ◽  
Special Place ◽  
Printed Books ◽  
Sacred Objects ◽  
Functional Purpose ◽  
Comprehensive Study

In the vast and varied written heritage of Metropolitan and Patriarch Nikon, the inscriptions on the “holy things” that were written with the participa- tion of, or on his behalf, occupy a special place. These texts, different in volume and content, exist as notes on sheets of manuscript and early printed books, in the form of belts and compositions of tiled temple decoration, as well as on an- timenes, crosses, icons, bells, liturgical vessels, and seals. Many of them by their origin and location are associated with the patriarchal monasteries — the Resur- rection in New Jerusalem near Moscow, the Iversky Svyatoozersky in Valdai and the Onega Godfather on the Kiy-island. The corpus of the inscriptions, united by the name of the Primate, has never been studied in its entirety and systematically. The authors of the article attempted to fill these gaps by applying an integrated approach in the study. They prepared on the principle of a catalog a register of “holy things” — sacred objects that make up a single whole with the texts present- ed on them. The inscriptions are classified according to the functional purpose of the objects on which they are located. The groups of annals-historical, spiritual- educational, liturgical, historical-topographic, supplementary and owner’s in- scriptions are distinguished. Historical and philological research of texts is com- plemented by an analysis of the symbolic and semantic aspects of their architectur- al and artistic design. The inscriptions appear in the context of the iconic work of Patriarch Nikon, including hierotopic, iconographic and architectural programs, embodied with the participation of masters from Great, Small and White Russia. A comprehensive study allowed us to see the inscriptions and the personality of His Holiness Nikon from a perspective that reveals the richest spectrum of litur- gical, church-historical, patristic and artistic traditions of Old Russia, combined with new trends melted down in the furnace of Orthodoxy.

Investigation of Flow and Forces on a Strongly Accelerated Circular Cylinder

2005 ◽  
Author(s):  
Vincent Melot ◽  
Bruno Auvity ◽  
Hassan Peerhossaini
Keyword(s):  
Research Work ◽  
Numerical Procedure ◽  
Operating Conditions ◽  
Gravitational Acceleration ◽  
Computational Domain ◽  
Fluid Medium ◽  
Experimental Part ◽  
Ale Formulation ◽  
Set Up ◽  
Under Construction

The present paper exposes the current research work carried out at LABORATOIRE DE THERMOCINE´TIQUE de NANTES within the framework of a collaborative research with DCN PROPULSION concerning the design of nuclear structures subjected to dynamic loading. The case under study consists of a cylinder strongly accelerated from rest in an infinite fluid medium. The main aim of the study is to predict forces acting on the cylinder and to provide a clear description of the flow phenomena. The duration of the mechanical impulse imposed on the cylinder is extremely short (of the order 15 milliseconds). The level of acceleration is 30 times the gravitational acceleration. These operating conditions are representative of a typical shock encountered in the environment of a military ship. This work is composed of a numerical and an experimental part. The numerical modeling is developed in a finite volume formulation. The cylinder is moved inside the computational domain using the ALE formulation for the moving mesh grid. Well-documented experiments on a cylinder impulsively started from rest are simulated to test the numerical procedure and validate our code. Then shocks with sinusoidal acceleration are simulated and compared with the theoretical model of Stokes. The experimental part presents the set-up currently under construction in the laboratory. The cylinder is put in motion by a hydraulic accelerator connected to a power hydraulic station and driven by a computer-controlled servo-valve. The metallic bar holding the cylinder is equipped with strain gauges measuring the integral forces acting on the cylinder.

Mathematical modeling and optimization of tribological behaviour of Al 7075 based hybrid nanocomposites

2020 ◽  
pp. 135065012096578
Author(s):  
C Kannan ◽  
R Ramanujam ◽  
ASS Balan
Keyword(s):  
Integrated Approach ◽  
Industrial Applications ◽  
Heat Treatments ◽  
Operating Conditions ◽  
Hybrid Nanocomposites ◽  
Unreinforced Alloy ◽  
Optimum Level ◽  
Hybrid Nanocomposite ◽  
Tribological Behaviour ◽  
Material Condition

Many industrial applications necessitate lightweight materials that possess better tribological behaviour. Whilst aluminium based nanocomposites are proposed owing to their lightness, their tribological characteristics must be improved which are dominantly influenced by the selection of reinforcements, manufacturing process and heat treatments. In this research, an aluminium hybrid nanocomposite is produced using a novel molten salt processing and subjected to different heat treatments. Their tribological behaviour is assessed under different operating conditions viz. load, sliding velocity and material condition of the pin. Regression models are formulated to predict the tribological behaviour of developed hybrid composite under different heat treatments. The most significant parameter and optimum level for each of these operating parameters are determined using analysis of variance, main and interaction plots and response surface methodology in the end. The integrated approach helps in deciding the optimum parameter setting for the development of nanocomposite with ameliorated tribological behaviour. Under the optimized conditions, the hybrid nanocomposite could able to reduce the wear resistance by about 63% and the coefficient of friction by 18.5% than unreinforced alloy.

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