scholarly journals Intelligent Matching Assembly: System Design Based on Reuse of Ultra-Difference Parts

2021 ◽  
Author(s):  
Yongjie Zhang ◽  
Kang Cao ◽  
Zhiqiang Cai ◽  
Xinwen Wang ◽  
Wei Jin
Keyword(s):  
High Efficiency ◽  
Functional Expression ◽  
Assembly System ◽  
High Tech ◽  
Pass Rates ◽  
Process Technology ◽  
Optimal Matching ◽  
Aerospace Manufacturing ◽  
Assembly System Design ◽  
Design Requirements

AbstractAs the industrial digitalization has been recently leaping forward, high-efficiency production processes emerge, and assembly integration technologies are being progressively developed. For high-tech industries (e.g., aerospace manufacturing), however, unprecedented challenges are imposed on the conventional assembly manufacturing process technology. To be specific, the shallow digitizing and intelligent technologies fail to satisfy the rising requirements for efficiency, pass rates and cost; in particular, the way to down-regulate the unqualified rate and assembly cost of parts production remains unclear. In the present study, an intelligent matching assembly system was designed for reapplying out-of-tolerance parts. In addition, the concept of the mating base is proposed. Next, the fit relation between parts is quantified by employing the functional expression of dimension data, and such a relation is characterized as a function constraint with a variable of dimension. Moreover, the designed intelligent matching system was introduced into the existing assembly process to reemploy a number of unqualified parts and determine the matching parts most suitable for the original unqualified parts. On that basis, the most suitable parts are enabled to be involved in the assembly activities, as an attempt to satisfy the design requirements. To efficiently find the optimal matching scheme in the database of the unqualified parts and most effectively employ the unqualified parts, a set of optimal matching algorithms are proposed, thereby significantly down-regulating the production cost. Lastly, Monte Carlo method was adopted to simulate the actual production data, and the optimal matching scheme determined by the intelligent matching system was analyzed and assessed, which verified the effectiveness and practicability of the system.

scholarly journals Assembly system design in captive offshoring – A semi-systematic review of literature

Procedia CIRP ◽  
2021 ◽  
Vol 97 ◽  
pp. 313-318
Author(s):  
Peter Burggräf ◽  
Matthias Dannapfel ◽  
Tobias Adlon ◽  
Katharina Müller
Keyword(s):  
Systematic Review ◽  
System Design ◽  
Assembly System ◽  
Review Of Literature ◽  
Assembly System Design ◽  
Captive Offshoring

scholarly journals DEVELOPMENT OF THE RUSSIAN AGRO-INDUSTRIAL COMPLEX IN THE CONTEXT OF THE FORMATION OF A NEW WORLD ECONOMIC STRUCTURE: THREATS AND OPPORTUNITIES

2021 ◽  
pp. 40-51
Author(s):  
О.В. Исаева ◽  
Е.П. Криничная
Keyword(s):  
New World ◽  
Agricultural Sector ◽  
High Efficiency ◽  
Economic Structure ◽  
International Market ◽  
Modern World ◽  
High Tech ◽  
Industrial Complex ◽  
Technological Structure ◽  
World Economic

В современном мире происходит формирование нового мирохозяйственного уклада, который характеризуется нестабильностью геополитической обстановки и «перекроением» торгово-экономических отношений, а также форсированным развитием высоких технологий и их активным внедрением в производственную сферу. В этой связи актуальным вопросом является усиление позиций России на международном рынке посредством реализации конкурентных преимуществ отечественных продовольственных товаров. Основа любого высокоэффективного и качественного производства, в том числе и аграрного, – техническая и технологическая оснащенность, высокий уровень которой обеспечивает своевременное выполнение агротехнологических мероприятий без нарушения технологических сроков сельскохозяйственных работ. Проведенные исследования показали, что в нашей стране отмечается значительное отставание в техникотехнологической обеспеченности и инновационности АПК в сравнении с передовыми аграрными странами, что не позволяет в полной мере реализовать потенциал сельскохозяйственной отрасли. В развитых странах мира отмечается переход к шестому технологическому укладу, основанному на применении наукоемких технологий. В этой связи для нашей страны все большую актуальность приобретают вопросы техникотехнологической модернизации и цифровизации аграрной отрасли, повышения инновационной активности субъектов агробизнеса, повсеместного использования научных достижений пятого технологического уклада и ускоренного перехода на «рельсы» шестого технологического уклада. Решение данных вопросов обеспечит паритет России с ведущими аграрными странами по качественным и количественным характеристикам выпускаемой сельскохозяйственной продукции на международном рынке. Одним из решений данной проблемы может стать разработка и внедрение единой государственной политики модернизации аграрной отрасли страны. In the modern world a new world economic structure is being formed, which is characterized by the instability of the geopolitical situation and the «redrawing» of trade and economic relations, as well as the forced development of high technologies and their active introduction into the production sphere. In this regard, an urgent issue is the strengthening of Russia's position in the international market through the implementation of competitive advantages of domestic food products. The basis of any high-efficiency and high-quality production, including agricultural, is technical and technological equipment, the high level of which ensures the timely implementation of agricultural technological measures without violating the technological terms of agricultural work. The conducted studies have shown that in our country there is a significant lag in the technical and technological provision and innovation of the agro-industrial complex in comparison with advanced agricultural countries, which does not allow us to fully realize the potential of the agricultural industry. In the developed countries of the world, there is a transition to the sixth technological structure, based on the use of high-tech technologies. In this regard, the issues of technical and technological modernization and digitalization of the agricultural sector, increasing the innovative activity of agribusiness entities, the widespread use of scientific achievements of the fifth technological structure and the accelerated transition to the «rails» of the sixth technological structure are becoming increasingly relevant for our country. The solution of these issues will ensure the parity of Russia with the leading agricultural countries in terms of the qualitative and quantitative characteristics of agricultural products on the international market. One of the solutions to this problem can be the development and implementation of a unified state policy for the modernization of the agricultural sector of the country.

Design of Switch Transformer about the Push-Pull Switch Power Supply

2013 ◽  
Vol 341-342 ◽  
pp. 1266-1270
Author(s):  
Gang Wu ◽  
Yu Tang
Keyword(s):  
Power Supply ◽  
High Efficiency ◽  
Skin Effect ◽  
Circuit Simulation ◽  
Switching Power Supply ◽  
Switching Power ◽  
The Family ◽  
Switch Power Supply ◽  
Design Requirements ◽  
Switch Power

the push-pull switch power is a kind of form in the family. It has the characteristics of good voltage output, high efficiency, the simple circuit and so on. On the design of the push-pull switch power supply, the key and difficult point is the design of switch transformer. Taking the switch transformer of a push-pull switching power supply as the research object and based on the design requirements, this paper aims to realize the calculation of the coil turns in switching transformer. Meanwhile, under the consideration of the skin effect and the proximity effect and the choices of switch transformers wires and the methods of wires winding, the design of switch transformer of the push-pull switch power supply has been completed by circuit simulation and implementation.

Developments in Assembly System Design: The Volvo Experience

2018 ◽  
pp. 192-223
Author(s):  
Tomas Engström ◽  
Dan Jonsson ◽  
Lars Medbo
Keyword(s):  
System Design ◽  
Assembly System ◽  
Assembly System Design

An Experimental Study of Heat Transfer With an Impinging Circular Water Jet

2003 ◽  
Author(s):  
Hao Leng ◽  
Liejin Guo ◽  
Ximin Zhang ◽  
Hongbin Min ◽  
G.-X. Wang
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
High Efficiency ◽  
Impinging Jet ◽  
High Heat ◽  
Water Jet ◽  
Back Surface ◽  
High Tech ◽  
High Heat Flux ◽  
Transfer Coefficients

Impinging jet is widely used in both traditional industrial and new high-tech fields. High efficiency heat transfer in impinging jet cooling makes it an important method for heat transfer enhancement, in particular in cooling of electronic devices with high heat density. This paper presents an experimental study of heat transfer by an impinging circular water jet. A Constantan foil with the size of 5 mm × 5 mm was used to simulate a microelectronic chip with heat generated by passing an electrical current through the foil. A high heat flux over 106 W/m2 was achieved. The surface temperature was measured by a thermocouple glued onto the back surface of the foil. Both a free surface jet and a submerged jet were investigated. Effect of the nozzle-to-surface spacing as well as the jet speed at the exit of the nozzle on cooling was examined. By positioning the jet away from the center of the heating foil surface, the radial variation of the heat transfer coefficients over the foil was also investigated. Quantitative heat transfer data have been obtained and analyzed.

scholarly journals Effects of Bacillus subtilis and Bacillus licheniformis on catfish in industrial aquaculture

2020 ◽  
Vol 175 ◽  
pp. 02013 ◽  
Author(s):  
Elena Romanova ◽  
Elena Spirina ◽  
Vasily Romanov ◽  
Vaselina Lyubomirova ◽  
Ludmila Shadyeva
Keyword(s):  
Bacillus Subtilis ◽  
Bacillus Licheniformis ◽  
Antioxidant Defense ◽  
High Efficiency ◽  
Breeding Systems ◽  
Stress Factors ◽  
High Tech ◽  
Control Group ◽  
Probiotic Properties ◽  
Antioxidant Defense Enzymes

When growing fish in high-tech breeding systems, it is exposed to many stress factors. To reduce stress, we used spore forms of microorganisms — Bacillus subtilis and Bacillus licheniformis, possessing probiotic properties. Two groups were formed, a control group and an experimental group that received probiotic microorganisms with feed. The aim of the study was to evaluate the effectiveness of the use of microorganisms — Bacillus subtilis and Bacillus licheniformis to reduce stress in fishes. For this indicator points were selected — stress hormone cortisol and antioxidant defense enzymes. The research results showed that stress level assessed by cortisol in fishes fed with probiotic microorganisms is 2.8 times lower than in the control group. The use of micronucleus test to assess cytogenetic damage showed that against the probiotic microbiota background, the number of cells with fragmented nuclei decreases by 5.7 times. Antioxidant defense enzyme activity when using Bacillus subtilis and Bacillus licheniformis increased, indicating activation of the defense system against oxidative stress. The obtained results demonstrated the high efficiency of the use of spore forms Bacillus subtilis and Bacillus licheniformis when growing catfish in high-tech fish farming systems. The Russian Foundation for Basic Research has supported our study with the grant No. 18-016-00127.

Simplification of process technology for high-efficiency solar cells

1997 ◽  
Author(s):  
A. W. Bett ◽  
S. W. Glunz ◽  
J. Knobloch ◽  
R. Schindler ◽  
W. Wettling
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Process Technology ◽  
High Efficiency Solar Cells
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