scholarly journals Methodology for Analyzing Competing Options for Air Management Systems at the Stage of Conceptual Design of Civil Aircraft's Complex of Onboard Systems

2019 ◽  
Vol 304 ◽  
pp. 04015 ◽  
Author(s):  
Roman Savelev ◽  
Denis Smagin ◽  
Tatiana Zyazeva
Keyword(s):  
Conceptual Design ◽  
Management System ◽  
Air Conditioning ◽  
Fuel Efficiency ◽  
Management Systems ◽  
Risk Level ◽  
Cooling Efficiency ◽  
Complex Criterion ◽  
Air Conditioning Systems ◽  
Increase Efficiency

Analysis of competing options for the implementation of the system is a key task at the stage of conceptual design of aviation air conditioning systems as these systems have a great impact on the fuel efficiency of the entire aircraft. The decision about choice of competing options regarding not only the appearance of the system, but also a lot of different parameters including technical, technological and so on. In case of conceptual design missing parameters for a complex criterion can be replaced by an alternative risk level estimate. This article shows an example how to compare competing variants of the air management system at the stage of conceptual design and provides a methodology for selecting the key parameters of the comparison criterion. As a result, it is shown that vapor cycle cooling is more promising due to the wide possibilities of reducing the mass of components and increasing the overall cooling efficiency. For the air cycle, most of the possible solutions to increase efficiency have already been implemented now.

ANALYSIS OF COMPETING VARIANTS OF AIR CONDITIONING SYSTEMS WITHOUT AIR EXTRACTION FROM ENGINES AT THE STAGE OF PASSENGER AIRCRAFT ONBOARD SYSTEMS CONCEPTUAL DESIGN

2019 ◽  
Vol 6 (3) ◽  
pp. 80-85
Author(s):  
Denis Igorevich Smagin ◽  
Konstantin Igorevich Starostin ◽  
Roman Sergeevich Savelyev ◽  
Anatoly Anatolyevich Satin ◽  
Anastasiya Romanovna Neveshkina ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Air Conditioning ◽  
Research University ◽  
Cooling System ◽  
Fuel Efficiency ◽  
Air Cooling ◽  
Moscow Aviation Institute ◽  
Air Conditioning System ◽  
Low Efficiency ◽  
Air Conditioning Systems

One of the ways to achieve safety and comfort is to improve on-board air conditioning systems.The use of air cooling machine determines the air pressure high level at the point of selection from the aircraft engine compressor. Because of the aircraft operation in different modes and especially in the modes of small gas engines, deliberately high stages of selection have to be used for ensuring proper operation of the refrigeration machine in the modes of the aircraft small gas engines. Into force of this, most modes of aircraft operation have to throttle the pressure of the selected stage of selection, which, together with the low efficiency of the air cycle cooling system, makes the currently used air conditioning systems energy inefficient.A key feature of the architecture without air extraction from the main engines compressors is the use of electric drive compressors as a source of compressed air.A comparative analysis of competing variants of on-board air conditioning system without air extraction from engines for longrange aircraft projects was performed at the Moscow Aviation Institute (National Research University).The article deals with the main approaches to the decision-making process on the appearance of a promising aircraft on-board air conditioning system at the stage of its conceptual design and formulated the basic requirements for the structure of a complex criterion at different life cycle stages.The level of technical and technological risk, together with a larger installation weight, will require significant costs for development, testing, debugging and subsequent implementation, but at the same time on-board air conditioning system scheme without air extraction from the engines will achieve a significant increase in fuel efficiency at the level of the entire aircraft.

scholarly journals Analysis and Optimization of Coupled Thermal Management Systems Used in Vehicles

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1265 ◽  
Author(s):  
Gequn Shu ◽  
Chen Hu ◽  
Hua Tian ◽  
Xiaoya Li ◽  
Zhigang Yu ◽  
...  
Keyword(s):  
Thermal Management ◽  
Management System ◽  
Air Conditioning ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Environmental Temperature ◽  
Waste Heat ◽  
Management Systems ◽  
Engine Load ◽  
Thermal Management System

About 2/3 of the combustion energy of internal combustion engine (ICE) is lost through the exhaust and cooling systems during its operation. Besides, automobile accessories like the air conditioning system and the radiator fan will bring additional power consumption. To improve the ICE efficiency, this paper designs some coupled thermal management systems with different structures which include the air conditioning subsystem, the waste heat recovery subsystem, engine and coolant subsystem. CO2 is chosen as the working fluid for both the air conditioning subsystem and the waste heat recovery subsystem. After conducting experimental studies and a performance analysis for the subsystems, the coupled thermal management system is evaluated at different environmental temperatures and engine working conditions to choose the best structure. The optimal pump speed increases with the increase of environmental temperature and the decrease of engine load. The optimal coolant utilization rate decreases with the increase of engine load and environmental temperature, and the value is between 38% and 52%. While considering the effect of environmental temperature and road conditions of real driving and the energy consumption of all accessories of the thermal management system, the optimal thermal management system provides a net power of 4.2 kW, improving the ICE fuel economy by 1.2%.

scholarly journals CRITERIAL APPROACH TO ANALYSIS OF THE COST MANAGEMENT SYSTEM OF BUSINESS STRUCTURES

2021 ◽  
Vol 1 (36) ◽  
pp. 190-202
Author(s):  
N. Radionova ◽  
S. Breus ◽  
M. Denysenko ◽  
Ye. Khaustova ◽  
A. Matiukh
Keyword(s):  
Management System ◽  
Cost Management ◽  
Management Systems ◽  
Operating Efficiency ◽  
Complex Criterion ◽  
Cost Management System ◽  
Business Structures ◽  
The Cost ◽  
Intermediate Value ◽  
Business Structure

The article presents the basic principles of a criteria-based approach to the analysis of the cost management system of business structures. The expediency of analysis for each stage of the cost management process is indicated. The stages of cost management are determined: development (adoption) of a solution, implementation of a solution and control. The method for calculating complex and resulting criteria for analyzing the effectiveness of the cost management system on the example of sewing enterprises is proposed. Among the main results of the proposed criterial approach, the assessment of the effectiveness of the cost management system of a business structure in the context of each stage of management and the possibility of comparing the effectiveness of cost management systems at different enterprises are determined. For each stage of management, the six local criteria have been developed and their quantitative characteristics are indicated to analyze the level of efficiency of the cost management system. Local criteria can take values from 0 to 1. For each of them, there are three options for the accepted value: the most and least effective and intermediate value. Local criteria are combined into a complex criterion. The complex criteria for each stage of management constitute the resulting criterion for assessing the cost management system of the business structure. The closer the obtained value of the resulting criterion is to 1, the more effective the cost management system at the enterprise becomes. The analysis of indicators of five leading domestic enterprises of the garment industry was carried out according to the given methodology. It was found that the performance indicators of each of the studied enterprises are almost half of the optimal result. It is noted that the researched enterprises need to focus on improving the existing cost management systems. Moreover, each enterprise has the cost management system with the different operating efficiency at each stage of management. That is, the proposed methodology allows enterprises to identify problematic aspects in the context of management stages and to make changes to the cost management system in order to increase its efficiency.

Perspectives of using standards based on management systems for increasing the competitiveness of fruit and vegetable products in the republic of Uzbekistan

2019 ◽  
Vol 2 (4) ◽  
pp. 48-53
Author(s):  
Imomov Jamshidxon Odilovich
Keyword(s):  
Network Management ◽  
Management System ◽  
Fruits And Vegetables ◽  
Economic Reforms ◽  
Management Systems ◽  
Fruit And Vegetable ◽  
Network Management System ◽  
Food Markets ◽  
Vegetable Products ◽  
The Republic

This article examines the role and importance of agriculture in the economy of the Republic of Uzbekistan and demonstrates the need to improve the competitiveness of fruit and vegetable products in future economic reforms and the need for implementing a network management system. The SWOT method also shows the prospects and ways to increase the competitiveness of fruits and vegetables in the global agrarian and food markets.

New approaches to improving enterprise management systems using international models and standards in a digital transformation environment

2020 ◽  
pp. 24-29
Author(s):  
V.V. Silaeva ◽  
◽  
V.P. Semenov ◽  
Keyword(s):  
Management System ◽  
Integrated Management ◽  
Digital Transformation ◽  
International Standards ◽  
System Model ◽  
Management Systems ◽  
Enterprise Management ◽  
Integrated Management System ◽  
New Approaches ◽  
Iso 31000

The relevance of creating integrated management systems for enterprises in a digital transformation environment is proved. New approaches to improving the management system in accordance with the new European excellence model (EFQM 2020) and international standards for achieving sustainable success and risk management are described. Approach to the development of integrated management system model based on the new EFQM 2020 model and international standards such as ISO 9004:2018 and ISO 31000:2018 is offered.

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