scholarly journals Modeling functioning of the pressure regulator in the fuel processor of the air-independent power plant

2021 ◽  
pp. 126-131
Author(s):  
А.В. Балакин ◽  
А.Н. Дядик ◽  
А.С. Кармазин ◽  
М.В. Ларионов ◽  
С.Н. Сурин
Keyword(s):  
Dead Zone ◽  
Control Valve ◽  
Control Signal ◽  
Programming Environment ◽  
Pressure Regulator ◽  
Fuel Processor ◽  
Pi Regulator ◽  
Control Body ◽  
Required Quality

В статье на основании упрощенной имитационной модели топливного процессора выполнены расчетные исследования в среде LabVIEW с учетом полученных экспериментальных данных. В основу структуры регулятора давления положен ПИ-регулятор с задаваемой зоной нечувствительности сигнала рассогласования заданного и фактического давления парогазовой смеси, составляющей 3 – 3,5% от величины сигнала задания. При этом коэффициенты усиления пропорциональной и интегральной составляющих управляющего сигнала устанавливаются в зависимости от значения задаваемого давления в соответствии с предложенной расчетной программой. Рассмотрена возможность использования привода регулирующего клапана без обратной связи по положению регулирующего органа. Для обеспечения требуемого качества переходных процессов по параметрам установки рекомендовано ограничивать скорость перемещения привода величиной 5 мм/мин., а формирование управляющего сигнала регулятора производить по рассогласованию между заданным и фактическим значениями давления с использованием установленной величины зоны нечувствительности 3 – 3,5%. In the article, on the basis of a simplified simulation model of a fuel processor, computational studies are performed in the LabVIEW programming environment, taking into account the experimental data obtained. The structure of the pressure regulator is based on a PI-regulator with a set dead zone for the signal of the mismatch between the set and actual pressure of the steam-gas mixture, which is 3 – 3.5% of the value of the set signal. In this case, the gains of the proportional and integral components of the control signal are set depending on the value of the set pressure in accordance with the proposed calculation program. The possibility of using a control valve actuator without feedback by the position of the control body is considered. To ensure the required quality of transient processes according to the parameters of the plant, it is recommended to limit the speed of movement of the drive to 5 mm per min, and the formation of the control signal of the regulator is carried out by the mismatch between the set and actual pressure values using the set dead zone value of 3 – 3.5%. The results of the work are described extremely accurately and informatively. The main theoretical and experimental results, actual data, discovered relationships and regularities are presented.

Construction Control As A Strategy For Improving The Quality Of Buildings And Structures

2020 ◽  
Keyword(s):  
Quality Control ◽  
Life Cycle ◽  
Construction Control ◽  
Construction Sites ◽  
Actual Problem ◽  
Construction Market ◽  
Construction Products ◽  
Underlying Causes ◽  
Required Quality

In construction production, the safety of constructing buildings and structures is achieved by ensuring the required quality as a result of systematic construction control based on the implementation of a complex of technical, economic and organizational measures at all stages of the object's life cycle. The article deals with the actual problem of improving the quality of construction products-buildings and structures in conjunction with the activities of construction control bodies. The article presents the advanced foreign and domestic experience of ensuring the quality control at the construction sites, providing for the prevention of the underlying causes of defects and increasing the interest of the contractors directly. On the basis of the analysis of the current situation with quality control at the construction market, ways to improve its efficiency by developing a unified system of technological implementation of relevant requirements for the quality of construction products, determining the rational number and business load of construction control engineers, as well as the active activities of self-regulatory organizations in this area are offered.

Conceptual imposings of quality management of system of production of composite materials for it is rocket the space equipment

2017 ◽  
Vol 14 (4) ◽  
pp. 30-38
Author(s):  
V. G. Isaev ◽  
T. N. Antipova
Keyword(s):  
Composite Materials ◽  
Quality Management ◽  
Evaluation Criteria ◽  
Criteria And Indicators ◽  
Properties Of Materials ◽  
A Priority ◽  
Required Quality

Basic provisions of the concept and methodology of production of composite materials for the missile and space equipment are offered. The system of the purposes realizing the principle of a priority of the purposes of the customer is offered. The system of evaluation criteria and indicators of quality of composite materials the realizing interrelation of requirements of the customer to quality of material and dependence of ensuring the required quality on the used technologies is developed. It is shown that for ensuring quality of composite materials for units and the RKT systems first of all it is necessary development of mathematical dependences of properties of materials on parameters of the technological modes in the conditions of obligatory implementation of requirements of the customer.

Coordination of technology of railway operation of the Republic of Tajikistan and organization of railways in international traffic

2018 ◽  
Vol 77 (4) ◽  
pp. 211-217 ◽  
Author(s):  
P. N. Pulatov
Keyword(s):  
Rolling Stock ◽  
Railway Transport ◽  
Transport Services ◽  
Railway Infrastructure ◽  
External Conditions ◽  
The Republic ◽  
Railway Operation ◽  
Required Quality

Current geopolitical and economic conditions for the functioning of railway transport in most post-Soviet states are such that it is extremely difficult to provide required quality of transport services and break-even operations at high expenses for maintaining the railway infrastructure and rolling stock. Dynamics of transportation of the Tajik Railway (TSR) is shown, which displays that most of its sections are classified as low-intensity ones. The paper proposes methodical principles, setting and qualitative analysis of the task of rationalization of operational work and organization of car flows for international transportation, taking into account the specifics of the Tajik Railway. There is a problem of complex maintenance of the efficiency of operational work in modern conditions based on the synthesis of the tasks of self-management (rational internal operational technology of the Tajik Railway) and coordination tasks (technological interaction with railway administrations of other states). Author substantiated the necessity of solving this problem. Proposed classification of technological restrictions and controlled variables in the performance of transport takes into account methods for changing external conditions for the functioning of the railway landfill and methods for increasing internal efficiency of its operation. The search for the solution of the problem involves direct search of variants along its ordered set with clipping of groups of variants that do not correspond to constraints, with the subsequent finding of compromise control over a set of effective alternatives.

scholarly journals A CDT-Based Heuristic Zone Design Approach for Economic Census Investigators

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Changixu Cheng ◽  
Xiaomei Song ◽  
Jing Yang ◽  
Xiatian Hu ◽  
Shi Shen ◽  
...  
Keyword(s):  
Delaunay Triangulation ◽  
Real World ◽  
Heuristic Method ◽  
Real World Application ◽  
Economic Census ◽  
Speed Up ◽  
Growth Approach ◽  
Special Zone ◽  
Required Quality

This paper addresses a special zone design problem for economic census investigators that is motivated by a real-world application. This paper presented a heuristic multikernel growth approach via Constrained Delaunay Triangulation (CDT). This approach not only solved the barriers problem but also dealt with the polygon data in zoning procedure. In addition, it uses a new heuristic method to speed up the zoning process greatly on the premise of the required quality of zoning. At last, two special instances for economic census were performed, highlighting the performance of this approach.

Studying demulsifier reactants for crude oil processing facilities

2021 ◽  
pp. 90-104
Author(s):  
L. V. Taranova ◽  
A. G. Mozyrev ◽  
V. G. Gabdrakipova ◽  
A. M. Glazunov
Keyword(s):  
Crude Oil ◽  
Bottom Water ◽  
Oil Content ◽  
Optimal Consumption ◽  
Residual Oil ◽  
Well Production ◽  
Oil Processing ◽  
Water Cut ◽  
Required Quality

The article deals with the issues of improving the quality of highly watered well production fluid processing using chemical demulsifier reactants at crude oil processing facilities; the analysis of the use of the reactants at the Samotlor field has been made. The article presents the results of the study of the effectiveness of the "Hercules 2202 grade A" and "SNPH-4460-2" demulsifiers in comparison with the indicators of oil and bottom water processing achieved in the presence of the reactants used at existing facilities; their optimal consumption has been determined. The study has shown that the selected demulsifiers provide the required quality of the oil and water under processing at the considered oil processing facilities and can be used along with the basic reactants for these facilities. On the basis of total indicators, the best results have been achieved using "Hercules 2202 grade A" with the improved indicators of water cut and residual oil content in water by 33.9 % and 2.8 % while reducing the reactant consumption by 9.7 % compared to the basic demulsifier.

Technical Control of Sewage Sludge Disposal to Sea

1982 ◽  
Vol 14 (3) ◽  
pp. 17-24 ◽  
Author(s):  
A G Cockburn
Keyword(s):  
Sewage Sludge ◽  
Scientific Methods ◽  
National Legislation ◽  
Sludge Disposal ◽  
Technical Control ◽  
Treatment Equipment ◽  
International Conventions ◽  
Required Quality ◽  
Practicable Method

Technical control of sewage sludge disposal to sea is carried out primarily to maintain the quality of the receiving environment and this paper discusses the control in the context of England and Wales. Control is exercised in several ways and by several bodies. There are international conventions and national legislation governing sludge dumping, the national legislation is enforced by the Ministry of Agriculture Fisheries and Food, who stipulate the required quality and quantity of sludge. The sludge is produced and disposed of by regional water authorities who must control the quality of their sludge and use trade effluent legislation to control effluent from industry. In turn industrialists must control their effluents to meet water authority standards and this usually requires the installation of water treatment equipment or even change of process. At all stages scientific methods are used to check the effect of the legislative control. It is important that the technical controls used to protect the environment are not over-stringent so that an economic and practicable method of sludge control is not wasted.

scholarly journals Nelder-Mead Optimized MADM Decision Support for Vertical Handover

2019 ◽  
Vol 8 (2S3) ◽  
pp. 601-604
Keyword(s):  
Decision Process ◽  
Vertical Handover ◽  
Network Selection ◽  
Heterogeneous Environment ◽  
Challenging Problem ◽  
Wireless Technology ◽  
Decision Strategy ◽  
Handover Decision ◽  
Required Quality

The vertical handover decision strategy is a challenging problem to support seamless mobility in different wireless technology. The handover decision process is reported to facilitate the required Quality of Service, but bad network selection and overload condition of the chosen network fallout in handover failures. Traditional handoff techniques typically are based on single parameter and are inefficient due to superfluous handovers. In addition, existing fuzzy based handoff method reduces the handover failures but increase the computational complexity. Furthermore, the existing mobile controlled handover techniques are not suitable for heterogeneous environment. Therefore this paper focus the need of efficient, robust and flexible vertical handover technique to reduce the handover failures and design an MADM based network controlled handover that maximize QoS in heterogeneous environment

scholarly journals Cutting mode impact upon output process parameters at processing of polycrystalline composite materials

2017 ◽  
Vol 2 (6) ◽  
pp. 34-38
Author(s):  
Ю. Зубарев ◽  
Yu. Zubarev ◽  
А. Приемышев ◽  
A. Priyomyshev ◽  
А. Заостровский ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Process Parameters ◽  
Polymeric Composite ◽  
Polymeric Composite Material ◽  
Output Process ◽  
Product Surface ◽  
Required Quality ◽  
Material Cutting

The peculiarities in polymeric composite material cutting are considered. The recommendations for use of different materials for cutters, their geometry and treatment modes are offered that allows obtaining the required quality of a product surface.

scholarly journals Profile and contour grinding of compressor blade butts

2016 ◽  
Vol 1 (1) ◽  
pp. 15-19
Author(s):  
В. Полетаев ◽  
V. Poletaev ◽  
Е. Цветков ◽  
E. Tsvetkov
Keyword(s):  
Surface Layer ◽  
Coordinate System ◽  
Quality Parameters ◽  
Compressor Blade ◽  
Improve Performance ◽  
Compressor Blades ◽  
Part Surface ◽  
Required Quality ◽  
Blade Production

The existing technologies of production of compressor blade butts related with traditional machining methods, including broaching and milling. Application of these machining methods requires further superfinishing operations to ensure the required quality of compressor blades. The automated highly-productive grinding of blade butts is an effective method to improve performance and quality of blade production. The technologies of profile and contour grinding of blades of a rotor and a compressor stator provide an automated machining of the outer parts contour in the same coordinate system, implement machining based on 3-D models of theoretical blade surfaces, ensure the required quality parameters of the part surface layer without additional finishing operations.

Transport in a Methanol Steam Reformer as the Fuel Processor for Fuel Cell Systems

2004 ◽  
Author(s):  
Hyung Gyu Park ◽  
Ming-Tsang Lee ◽  
Frank K. Hsu ◽  
Costas P. Grigoropoulos ◽  
Ralph Greif ◽  
...  
Keyword(s):  
Analytical Study ◽  
Processing System ◽  
Reacting Flow ◽  
Hydrogen Fuel Cells ◽  
Catalytic Reactor ◽  
Hydrogen Fuel ◽  
Fuel Processing ◽  
Fuel Processor ◽  
Optimized Conditions

An experimental and analytical study of the reacting flow in a catalytic reactor is presented. Methanol-steam reforming may be utilized in the fuel processing system for hydrogen fuel cells. Understanding the flow and transport phenomena as well as the reaction mechanisms is essential for improving the efficiency of the reforming process as well as the quality of the processed fuel. Utilizing the results obtained, optimized conditions for fuel processing are discussed.

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