Parameters Optimization of Linear Compressor for Refrigerator

2013 ◽  
Vol 331 ◽  
pp. 84-87 ◽  
Author(s):  
Zhi Hai Li ◽  
Yan Liu ◽  
Yuan Zhong
Keyword(s):  
System Analysis ◽  
High Efficiency ◽  
Input Power ◽  
Wire Diameter ◽  
Parameters Optimization ◽  
Free Piston ◽  
Linear Compressor ◽  
Effective Work ◽  
Cylinder Diameter ◽  
System Equations

Recently linear compressor with a free piston is widely paid attention to for its high efficiency. This paper presents parameters optimization of linear compressor used for Refrigerator. The system equations of linear compressor are established through system analysis and solved by variable step Newmark method. The piston movement, current, input power, effective work, resistive loss, damping loss and efficiency are calculated for the optimization from the system equations. Coil wire diameter, stroke and cylinder diameter are important parameters of linear compressor, which have great importance on its performance. The coil wire diameter was changed to find out its affect to loss of resistance. The efficiency of linear compressor and current of the coil are analyzed with the same exhaust volume and different stroke and cylinder diameter. Through the analysis the parameters of the linear compressor are optimized.

scholarly journals Research on the Operating Characteristics of Hydraulic Free-Piston Engines: A Systematic Review and Meta-Analysis

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3530
Author(s):  
Fukang Ma ◽  
Shuanlu Zhang ◽  
Zhenfeng Zhao ◽  
Yifang Wang
Keyword(s):  
Systematic Review ◽  
High Efficiency ◽  
Meta Analysis ◽  
Combustion Process ◽  
Research Progress ◽  
Future Research ◽  
Operating Characteristics ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine

The hydraulic free-piston engine (HFPE) is a kind of hybrid-powered machine which combines the reciprocating piston-type internal combustion engine and the plunger pump as a whole. In recent years, the HFPE has been investigated by a number of research groups worldwide due to its potential advantages of high efficiency, energy savings, reduced emissions and multi-fuel operation. Therefore, our study aimed to assess the operating characteristics, core questions and research progress of HFPEs via a systematic review and meta-analysis. We included operational control, starting characteristics, misfire characteristics, in-cylinder working processes and operating stability. We conducted the literature search using electronic databases. The research on HFPEs has mainly concentrated on four kinds of free-piston engine, according to piston arrangement form: single piston, dual pistons, opposed pistons and four-cylinder complex configuration. HFPE research in China is mainly conducted in Zhejiang University, Tianjin University, Jilin University and the Beijing Institute of Technology. In addition, in China, research has mainly focused on the in-cylinder combustion process while a piston is free by considering in-cylinder combustion machinery and piston dynamics. Regarding future research, it is very important that we solve the instabilities brought about by chance fluctuations in the combustion process, which will involve the hydraulic system’s efficiency, the cyclical variation, the method of predicting instability and the recovery after instability.

Parameters optimization of a high efficiency discrete Raman fiber amplifier

2007 ◽  
Author(s):  
Liang Dou ◽  
Shien-Kuei Liaw ◽  
Ming Li ◽  
Yi-Tseng Lin ◽  
Anshi Xu
Keyword(s):  
High Efficiency ◽  
Fiber Amplifier ◽  
Parameters Optimization ◽  
Raman Fiber Amplifier

An Application and Research of Gray-Relation for Color Classification in Dyeing Textile

2013 ◽  
Vol 694-697 ◽  
pp. 2881-2885
Author(s):  
Hai Yan Wang ◽  
Jian Xin Zhang
Keyword(s):  
System Analysis ◽  
High Efficiency ◽  
Information Management System ◽  
Space Distribution ◽  
Color Classification ◽  
Uniform Sampling ◽  
Forecast Precision ◽  
Internal Instability ◽  
The Stability

Dyeing textile’s information management system is the basis of accurate classification of color， machine studying methods have became a popular area of research for application in color classification. Traditional classification methods have high efficiency and are very simple ， but they are dependent on the distribution of sample spaces. If the sample data properties are not independent， forecast precision will been affected badly and internal instability will appear. An application of Gray-Relation for dyeing textile color classification has been designed， which offsets the discount in mathematical statistics method for system analysis. It is applicable regardless of variant in sample size， while quantizing structure is in agreement with qualitative analysis. On the basis of theoretical analysis， Dyeing textile color classification was conducted in the conditions of random sampling、 uniform sampling and stratified sampling. The experimental results proofs that by using Gray-Relation， dyeing textile color classification does not need to be dependent on sample space distribution， and increases the stability of classification.

scholarly journals Valeological support of library-information activities in school libraries

Bibliosphere ◽  
2017 ◽  
pp. 71-78
Author(s):  
V. Y. Sokolov
Keyword(s):  
General Education ◽  
Social Life ◽  
Information Technologies ◽  
System Analysis ◽  
Healthy Lifestyle ◽  
School Library ◽  
School Libraries ◽  
Educational Work ◽  
Health Culture ◽  
Effective Work

The article outlines general characteristics of the originality of forming valeological functions in a school library. The paper objective is to study peculiarities of the valeological support of library-information activities in school libraries, as well as the specifics analysis of their library and cultural-educational work aimed at developing the health culture of this activity subjects The author consistently reveals the peculiarities of forming the valeological function of school libraries under conditions of the information society development and dissemination of information-telecommunication technologies in libraries. The article describes cultural-educational activities of libraries directed to develop the health culture not only in readers (schoolchildren, their parents, teachers), but in librarians themselves. The author applies both general scientific methods of research (analysis, synthesis, deduction, induction, generalization, abstraction, comparative, structural-functional methods, method of system analysis, etc.) and special ones (method of analysis of analog objects, information processing, grouping). While researching the author concludes about necessity of the the following: to equip educational libraries technically; to update and strengthen the information base and book stocks of school libraries; to ensure the access of libraries to information resources, in particular the Internet; to form a unified electronic database of school library collections; to develop a form of resource integration with other educational libraries; to create a standing order on the status of libraries in basic schools; to develop a system for improving the skills of school library staff; to organize special training for school librarians to master their knowledge and skills of a healthy lifestyle. Therefore, the school librarian must be trained according to a separate professional specialization. The social life development requires librarians to know not only the valeology bases, but the ability to navigate in information technologies, school curricula and training courses diversitys. Modern problems of information education and forming a high level of valeological culture can be solved only by combining the efforts of general education institutions and school libraries, teachers and librarians. Pedagogical experience shows that knowledge on the health formation and preservation is a necessary and insufficient factor in students' personality development. To influence the behavior, informative methods should be combined with life skills of effective work and rest, physical activity, rational nutrition, an ability to analyze health issues and make appropriate decisions. Thus, forming health culture through library-information activities provides arming school readers and librarians with knowledge on social and individual health and applying certain information technologies in their activities.

scholarly journals SALES-MANAGEMENT AS А ONE OF THE KEY DIRECTIONS OF MODERN ORGANIZATION MANAGEMENT

2021 ◽  
Vol 2021 (1) ◽  
pp. 43-57
Author(s):  
Yu. Matvieieva ◽  
Yu. Opanasiuk ◽  
T. Bondar ◽  
D. Petrenko
Keyword(s):  
Business Processes ◽  
System Analysis ◽  
Sales Management ◽  
Sales Manager ◽  
Analytical Control ◽  
Sales Managers ◽  
Effective Work ◽  
Sales Professionals ◽  
Goods And Services ◽  
Line Manager

Today the sale of goods and services is one of the most popular and relevant activities in the world. In this context, scientists and practitioners study the skills, abilities and competencies of specialists in this field. In companies working in the field of sales of goods and services, special attention is paid to the development of a motivational system for sales managers in order to increase their productivity. The theoretical and scientific and methodological approaches to improving the management system of a company operating in the field of sales have been investigated in the paper. The main directions and types of sales have been determined, the modern tools of effective sales have been revealed taking into account the experience of one of the leading companies in the field of sales. Also, the special attention is paid to the business characteristics and personal qualities of a successful sales manager. The business processes for the incoming line manager have been described as an algorithm. The processes of management of sales departments of enterprises have been studied on the basis of the use of system analysis. An approach to determining the efficiency of sales managers has been proposed, on the basis of which the formation of an annual matrix of sales managers' efficiency has been envisaged. The main reasons for the loss of quality requests and orders have been identified. The approach to personnel management of trade enterprises has been offered and the necessity of conducting analytical control of sales, management of interconnected processes as a single stream for effective work have been substantiated. The directions of increase of efficiency of work of sales department, by reduction of time for processing of inquiries, introduction of administrative actions have been defined. The possibility of increasing the company's income by increasing the quality of work of each employee of the sales department has been identified. A system of motivation for sales professionals according to their levels has been proposed: financial motivation (I level), financial and non-financial motivation (II level), promotion of sales managers (III level), providing creative freedom in work and the ability to make decisions in company management ( IV level). In turn, the motivation package should take into account the level of rejection of the order for each manager. At the same time the directions of sales should be taken into account: B2B sales, B2D sales, B2C sales, D2C sales.

scholarly journals Design considerations of a linear generator for a range extender application

2015 ◽  
Vol 64 (4) ◽  
pp. 581-592
Author(s):  
Un-Jae Seo ◽  
Björn Riemer ◽  
Rüdiger Appunn ◽  
Kay Hameyer
Keyword(s):  
Electric Vehicle ◽  
High Efficiency ◽  
Piston Engine ◽  
Free Piston ◽  
Full Load ◽  
Linear Generator ◽  
Design Considerations ◽  
Range Extender ◽  
Free Piston Engine ◽  
Linear Generators

Abstract The free piston linear generator is a new range extender concept for the application in a full electric vehicle. The free piston engine driven linear generators can achieve high efficiency at part and full load which is suitable for the range extender application. This paper presents requirements for designing a linear generator deduced from a basic analysis of a free piston linear generator.

Sign in / Sign up

Export Citation Format

Share Document