scholarly journals Design peculiarities of pipeline support on landslide slopes

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Darya Leyer ◽  
Dmitry Seryi ◽  
Nikolai Lubarsky
Keyword(s):  
Optimal Design ◽  
Block Diagram ◽  
Three Dimensional ◽  
Emergency Situation ◽  
Economic Feasibility ◽  
Software Systems ◽  
Pipeline Construction ◽  
Geological Conditions ◽  
Design Solutions ◽  
Protective Structures

The pipeline construction in complex engineering-geological conditions requires a thorough initial data analysis, as well as complex slope modeling using modern software systems. The article discusses the features of the foundation construction for stand-alone supports for power lines and pipelines on landslide slopes composed of clay soils. Relevant Russian regulations documents administer above-ground pipelining, which significantly complicates the design process. However, above-ground pipelining allows monitoring the slope condition (formation road edge breakaway), foundations (deviation from the design location), as well as the pipeline (displacement of the route axis, the state of welds). Timely detected deviations allow avoiding an emergency situation. The author considers possible options for constructive solutions for support foundations, as well as protective structures exemplified by a real Krasnodar Krai object. The pipeline construction in active landslide displacements conditions, as well as the presence of seismic effects, requires not only ensuring the construction's economic feasibility, but also the work safety. In the developing process of optimal design solutions, slope computer modeling was executed both in two-dimensional and three-dimensional formulations based on the finite element method using the Plaxis 2D and Plaxis 3D programs. The considered design situations made it possible to take into account the worst load combinations possible during pipeline operation. According to the calculation results and a comprehensive engineering and geological conditions study at the site, as well as the construction organization peculiarities, a block diagram has been developed that makes it possible to determine the optimal design solutions for protective structures in relation to any landslide construction site.

An Image Reconstruction System Applied to High Voltage Microscopy

1975 ◽  
Vol 33 ◽  
pp. 292-293
Author(s):  
D. E. Johnson
Keyword(s):  
High Voltage ◽  
Prior Information ◽  
Block Diagram ◽  
Three Dimensional ◽  
Real Space ◽  
Two Dimensional ◽  
Efficient Manner ◽  
Fourier Methods ◽  
Tilt Series ◽  
Methods Of Reconstruction

Increased specimen penetration; the principle advantage of high voltage microscopy, is accompanied by an increased need to utilize information on three dimensional specimen structure available in the form of two dimensional projections (i.e. micrographs). We are engaged in a program to develop methods which allow the maximum use of information contained in a through tilt series of micrographs to determine three dimensional speciman structure.In general, we are dealing with structures lacking in symmetry and with projections available from only a limited span of angles (±60°). For these reasons, we must make maximum use of any prior information available about the specimen. To do this in the most efficient manner, we have concentrated on iterative, real space methods rather than Fourier methods of reconstruction. The particular iterative algorithm we have developed is given in detail in ref. 3. A block diagram of the complete reconstruction system is shown in fig. 1.

Q-optimal experimental designs and close to them experimental designs for polynomial regression on the interval

2020 ◽  
Vol 86 (5) ◽  
pp. 65-72
Author(s):  
Yu. D. Grigoriev
Keyword(s):  
Optimal Design ◽  
Polynomial Regression ◽  
Direct Consequence ◽  
Experimental Designs ◽  
Optimal Designs ◽  
Software Systems ◽  
General Character ◽  
Support Points ◽  
Optimal Weights ◽  
Universal Expression

The problem of constructing Q-optimal experimental designs for polynomial regression on the interval [–1, 1] is considered. It is shown that well-known Malyutov – Fedorov designs using D-optimal designs (so-called Legendre spectrum) are other than Q-optimal designs. This statement is a direct consequence of Shabados remark which disproved the Erdős hypothesis that the spectrum (support points) of saturated D-optimal designs for polynomial regression on a segment appeared to be support points of saturated Q-optimal designs. We present a saturated exact Q-optimal design for polynomial regression with s = 3 which proves the Shabados notion and then extend this statement to approximate designs. It is shown that when s = 3, 4 the Malyutov – Fedorov theorem on approximate Q-optimal design is also incorrect, though it still stands for s = 1, 2. The Malyutov – Fedorov designs with Legendre spectrum are considered from the standpoint of their proximity to Q-optimal designs. Case studies revealed that they are close enough for small degrees s of polynomial regression. A universal expression for Q-optimal distribution of the weights pi for support points xi for an arbitrary spectrum is derived. The expression is used to tabulate the distribution of weights for Malyutov – Fedorov designs at s = 3, ..., 6. The general character of the obtained expression is noted for Q-optimal weights with A-optimal weight distribution (Pukelsheim distribution) for the same problem statement. In conclusion a brief recommendation on the numerical construction of Q-optimal designs is given. It is noted that in this case in addition to conventional numerical methods some software systems of symbolic computations using methods of resultants and elimination theory can be successfully applied. The examples of Q-optimal designs considered in the paper are constructed using precisely these methods.

Application and Research of Digital Technology in Optimal Design of CNC Floor Boring and Milling Machine

2012 ◽  
Vol 429 ◽  
pp. 111-115
Author(s):  
Zhen Long Leng ◽  
Jin Feng Yang ◽  
Qun Ping Liu ◽  
Xun Deng
Keyword(s):  
Numerical Simulation ◽  
Optimal Design ◽  
Digital Technology ◽  
Three Dimensional ◽  
Milling Machine ◽  
Machine Model ◽  
Digital Modeling ◽  
Key Technologies ◽  
The Cost ◽  
Interference Checking

This paper focuses on application of the three-dimensional digital modeling, numerical analysis and optimization, digital control and other key technologies which provide technical support for the design and development in CNC floor boring and milling machine manufactruing. The three-dimensional digital modeling, digital assembly, interference checking help to eliminate some hidden trouble before processing and assembly. Numerical simulation reduces the cost and shortens the cycle of designand manufactruing in the optimal design of the machine. This technique has been successfully applied to a CNC Floor Boring and Milling Machine Model, which has been running for three years and achieved satisfactary economic result.

Optimal design of the horn gear for rotary three-dimensional braiding machine

2020 ◽  
Vol 111 (11) ◽  
pp. 1596-1602
Author(s):  
Chengjie Du ◽  
Zhuo Meng ◽  
Yize Sun ◽  
Jianyong Yu
Keyword(s):  
Optimal Design ◽  
Three Dimensional

scholarly journals Optimal design and economic feasibility of rooftop photovoltaic energy system for Assuit University, Egypt

2021 ◽  
Author(s):  
Hilmy Awad ◽  
Yasser Fathi Nassar ◽  
Ahmed Hafez ◽  
Mohamed K. Sherbiny ◽  
Alaa.F.M Ali
Keyword(s):  
Optimal Design ◽  
Energy System ◽  
Economic Feasibility ◽  
Photovoltaic Energy

scholarly journals Safety of building constructed on hillside slope

2021 ◽  
Vol 23 (1) ◽  
pp. 126-139
Author(s):  
S. V. Yushchube ◽  
I. I. Podshivalov ◽  
A. S. Larionov
Keyword(s):  
Pile Foundation ◽  
Strain State ◽  
Three Dimensional ◽  
Soil Formation ◽  
The Other ◽  
Structural Safety ◽  
Construction Site ◽  
Geological Surveys ◽  
Geological Conditions ◽  
Supporting Structures

The paper focuses on the pile foundation and footing of the building constructed on a hillside slope and consisting of four three-dimensional blocks. The building is arranged such that to protect the first block constructed on the footslope from the negative technogenic influence of the latter via the embedment of three supporting blocks into the hillside slope. The first three-dimensional block is a three-storey brick building, while the other three are the spatial supporting structures made of insitu reinforced concrete. All the blocks locate at different position levels. The resulting embedded part of the structure matches the class KS-3 construction site safety. It is thus necessary to assess the structural safety of the building constructed in difficult engineering and geological conditions. The MicroFe software is used for finite element dimensional calculations of the pile foundation and footing strength, stability and oscillation after studying the engineering-geological surveys, the analysis of the soil formation, composition and physicalmechanical properties, the piling field. Also, the theoretical model is proposed for the footingfoundation–building system. The obtained results allow assessing the stress-strain state of the pile foundation and footing with the lateral support to the hillside slope of soil.

scholarly journals METHODS AND MODELS OF SAFETY-FOCUSED STAKEHOLDER MANAGEMENT IN CIVIL PROTECTION PROJECTS

2019 ◽  
Vol 19 ◽  
pp. 36-43
Author(s):  
A. Ivanusa ◽  
S. Yemelyanenko ◽  
E. Morsch
Keyword(s):  
Project Management ◽  
System Analysis ◽  
Stakeholder Management ◽  
Emergency Situation ◽  
Regulatory Framework ◽  
Life Safety ◽  
Civil Protection ◽  
The Public ◽  
Management Models ◽  
Protective Structures

The information analysis of successful practices of implementation of life safety projects was conducted, which allowed determining necessary models and methods of safety-focused stakeholders management in civil protection projects. Fire risk assessment at public gathering places has shown that the risks of human deaths in such structures to a large extent depend on the duration of the maximum permissible values of dangerous fire factors, which make it impossible to conduct safe evacuation of people. Improving the effectiveness of the implementation of the program for the creation and development of a security system at public gathering places, which include protective structures, requires the use of methods and models based on the use of information technology, system approach and security-focused man-agement. To construct stakeholder management models, based on the analysis of causative relationships and the use of the Japanese P2M knowledge system, a conceptual model of security-focused project management in the civil protec-tion system was initially constructed, which takes into account: the state of the turbulent environment of civil protection projects implementation, scale of emergency situation, key factors for the success of civil protection projects implemen-tation, regulatory framework of Ukraine and world methodologies for project management, physiological and physio-logical condition of people, strategic objectives, and performance indicators. Stakeholder management models reflect the evacuation routes of traffic flows from the public gathering places to the shelter facility, as well as the parameters that influence the movement of people in separate evacuation areas that need to be taken into account when calculating the time of implementation of civil protection projects. Using system analysis and topological synthesis of flexible technological lines, the mathematical apparatus describing the stakeholder management in civil protection project, the requirements of the regulatory framework for ensuring safety of people in protective structures, the calculation of opti-mal placement of people in the shelter facilities, which makes it possible to implement the project of ensuring the safety of people at the public gathering places in the neighborhood of the Lviv State University of Life Safety.

scholarly journals Fracture of Protective Structures from Heavy Reinforcing Cement During Interaction with High-velocity Impactor

2021 ◽  
Vol 14 (6) ◽  
pp. 779-786
Author(s):  
Pavel A. Radchenko ◽  
◽  
Stanislav P. Batuev ◽  
Andrey V. Radchenko
Keyword(s):  
Reinforced Concrete ◽  
High Velocity ◽  
Solid Mechanics ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Free Surfaces ◽  
Local Fracture Criterion ◽  
Protective Structures ◽  
Concrete Barrier ◽  
Limiting Value

In this work, the fracture of a reinforced concrete barrier made of heavy reinforced ce- ment is numerically simulated during normal interaction with a high-velocity titanium projectile. The projectile has the initial velocity 750 m/s. The problem of impact interaction is numerically solved by the finite element method in a three-dimensional formulation within a phenomenological framework of solid mechanics. Numerical modeling is carried out using an original EFES 2.0 software, which al- lows a straightforward parallelization of the numerical algorithm. Fracture of concrete is described by the Johnson-Holmquist model that includes the strain rate dependence of the compressive and tensile strengths of concrete. The computational algorithm takes into account the formation of discontinuities in the material and the fragmentation of bodies with the formation of new contact and free surfaces. The behavior of the projectile material is described by an elastoplastic medium. The limiting value of the plastic strain intensity is taken as a local fracture criterion for the projectile material. A detailed numerical analysis was performed to study the stress and strain dynamics of the reinforced concrete target and the effect of shock-wave processes on its fracture. The influence of reinforcement on the resistance of a heavy cement target to the penetration of a projectile has been investigated

scholarly journals Three-dimensional optimal design of a cooled turbine considering the coolant-requirement change

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 768-778
Author(s):  
Wei Ba ◽  
Ziyuan Wang ◽  
Xuesong Li ◽  
Chunwei Gu
Keyword(s):  
Optimal Design ◽  
Gas Turbine ◽  
Turbine Blades ◽  
Three Dimensional ◽  
Aerodynamic Performance ◽  
Pressure Surface ◽  
Component Efficiency ◽  
Requirement Change ◽  
Cooling Air ◽  
Gas Turbine Cycle

Abstract Cooling technology is widely applied in modern turbines to protect the turbine blades, and extracting high-pressure cooling air from a compressor exerts a remarkable influence on the gas-turbine performance. However, the three-dimensional optimal design of a turbine in modern industrial practice is usually carried out by pursuing high component efficiency without considering possible changes in coolant requirement; hence, it may not exactly lead to improvement in the gas-turbine cycle efficiency. In this study, the turbine stator was twisted and leaned to achieve higher comprehensive efficiency, which is the cycle-based efficiency definition for a cooled turbine that considers both turbine aerodynamic performance and coolant requirement. First, the influence of twist and compound lean on turbine aerodynamic performance, considering stator-hub leakage, was investigated. Then, a method to predict the coolant requirement for turbines with different stator designs was applied, to evaluate coolant-requirement change at the design condition. The optimized turbines were finally compared to demonstrate the necessity of considering the coolant-requirement change in the optimal design. This indicated that proper twisting to open the throat area in the stator hub and compound lean to the pressure surface side could help improve the cooled-turbine comprehensive efficiency.

scholarly journals Determination of pressure in the near-ground space pile terminated and broadening of the surface

2018 ◽  
Vol 251 ◽  
pp. 04062
Author(s):  
Natalia Kupchikova
Keyword(s):  
Numerical Modeling ◽  
Circular Cross Section ◽  
Analytical Form ◽  
Soil Mass ◽  
Software Systems ◽  
Discrete Method ◽  
Building Foundation ◽  
Geological Conditions ◽  
Complex Engineering

The article deals with the problem of determining the stress state of a complex pile structure with end broadening in the form of a sphere in the soil mass in the analytical form by a discrete method. The calculation schemes for determining the stress tensor at the boundary of the pile of square and circular cross-section with expansions in the soil massif are shown. The elements of the polynomial are found by the discrete method in rectangular and spherical coordinates, which is a cumbersome complex mathematical apparatus for a modern design engineer. The stresses are determined. At present, as the analysis has shown, the solution of complex geotechnical problems of soil bases and foundations for different types of loads in numerical modeling is carried out using modern software. Numerical modeling and calculation with the help of specialized software systems allows to consider the system “building-foundation-ground foundation”, as dynamic, integrally developing. However, the interaction of the components of this system requires a theoretical justification of the resistance of foundations in the ground environment, especially in complex engineering-geological conditions.

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