scholarly journals Evaluation of energy efficiency of thrust hybrid bearings with active control of lubrication regime

2019 ◽  
Vol 1 ◽  
pp. 166-173
Author(s):  
A. Babin ◽  
L. Savin ◽  
A. Kornaev
Keyword(s):  
Energy Efficiency ◽  
Active Control ◽  
Lubrication Regime

Active Control of Shock

2005 ◽  
Author(s):  
Hidekazu Nishimura ◽  
Dezhang Wang ◽  
Yoichi Amano ◽  
Taro Shimogo
Keyword(s):  
Energy Efficiency ◽  
Energy Balance ◽  
Active Control ◽  
Contact Stiffness ◽  
State Control ◽  
Final State ◽  
Time Deformation ◽  
Collision Problem ◽  
Deformation Ratio ◽  
Predetermined Time

In this paper we deal with active control of shock in a collision problem between two objects. In order to make it clear how the deformation of the shock-receiving object can be maximized while minimizing the deformation of the shock-giving object and how energy can be transmitted unilaterally, the relationships among contact stiffness, deformation time, deformation ratio and energy balance are discussed. The final-state control is applied to obtain a feedforward input to deform the shock-receiving object by a desired amount in a predetermined time. Thus, the energy balance and the energy efficiency are verified. Furthermore we examine the conditions necessary to realize a ‘dynamical diode’ that can transmit energy unilaterally from the shock-giving object to the shock-receiving object. It is demonstrated experimentally that the appropriate feedforward input can be obtained by final-state control under specified conditions of contact stiffness and deformation time.

scholarly journals Application of Innovative Technologies for Active Control and Energy Efficiency in Water Supply Systems

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3278
Author(s):  
Armando Carravetta ◽  
Maurizio Giugni ◽  
Stefano Malavasi
Keyword(s):  
Energy Efficiency ◽  
Water Supply ◽  
Active Control ◽  
Energy Use ◽  
Water Systems ◽  
Water Supply Systems ◽  
Innovative Technologies ◽  
New Perspective ◽  
Supply Systems ◽  
Anthropic Pressure

The larger anthropic pressure on the Water Supply Systems (WSS) and the increasing concern for the sustainability of the large energy use for water supply, transportation, distribution, drainage and treatment are determining a new perspective in the management of water systems [...]

Stiff and soft active control of friction by vibrations and their energy efficiency

2018 ◽  
Vol 82 (4) ◽  
pp. 331-339 ◽  
Author(s):  
J. Benad ◽  
M. Popov ◽  
K. Nakano ◽  
V. L. Popov
Keyword(s):  
Energy Efficiency ◽  
Active Control ◽  
Active Control Of Friction

scholarly journals Stable formations of self-propelled fish-like swimmers induced by hydrodynamic interactions

2018 ◽  
Vol 15 (147) ◽  
pp. 20180490 ◽  
Author(s):  
Longzhen Dai ◽  
Guowei He ◽  
Xiang Zhang ◽  
Xing Zhang
Keyword(s):  
Energy Efficiency ◽  
Fluid Mechanics ◽  
Numerical Simulations ◽  
Active Control ◽  
The Self ◽  
Hydrodynamic Interactions ◽  
Control Mechanisms ◽  
Fish Schools ◽  
Emergent Feature ◽  
Macro Scale

Fish schools are fascinating examples of macro-scale systems with collective behaviours. According to conventional wisdom, the establishment and maintenance of fish schools probably need very elaborate active control mechanisms. Sir James Lighthill posited that the orderly formations in fish schools may be an emergent feature of the system as a result of passive hydrodynamic interactions. Here, numerical simulations are performed to test Lighthill’s conjecture by studying the self-propelled locomotion of two, three and four fish-like swimmers. We report the emergent stable formations for a variety of configurations and examine the energy efficiency of each formation. The result of this work suggests that the presence of passive hydrodynamic interactions can significantly mitigate the control challenges in schooling. Moreover, our finding regarding energy efficiency also challenges the widespread idea in the fluid mechanics community that the diamond-shaped array is the most optimized pattern.

Drying and heating of scrap metal at steelmaking: industrial safety, economics, ecology

2020 ◽  
Vol 76 (12) ◽  
pp. 1353-1258
Author(s):  
V. A. Spirin ◽  
V. E. Nikol’skii ◽  
D. V. Vokhmintsev ◽  
A. A. Moiseev ◽  
P. G. Smirnov ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
High Efficiency ◽  
Steel Production ◽  
Scrap Metal ◽  
Industrial Safety ◽  
Technical Solution ◽  
Metal Charge ◽  
Basic Task ◽  
Scrap Heating ◽  
Winter Time

At steel production based on scrap metal utilization, the scrap heating before charging into a melting facility is an important way of energy efficiency increase and ecological parameters improving. In winter time scrap metal charging with ice inclusions into a metal melt can result in a considerable damage of equipment and even accidents. Therefore, scrap preliminary drying is necessary to provide industrial safety. It was shown, that in countries with warm and low-snow climate with no risk of scrap metal icing up during its transportation and storing in the open air, the basic task being solved at the scrap drying is an increase of energy efficiency of steelmaking. InRussiathe scrap metal drying first of all provides the safety of the process and next - energy saving. Existing technologies of scrap metal drying and heating considered, as well as advantages and drawbacks of technical solutions used at Russian steel plants. In winter time during scrap metal heating at conveyers (Consteel process) hot gases penetrate not effectively into its mass, the heat is not enough for evaporation of wetness in the metal charge. At scrap heating by the furnace gases, a problem of dioxines emissions elimination arises. Application of shaft heaters results in high efficiency of scrap heating. However, under conditions of Russian winter the upper scrap layers are not always heated higher 0 °С and after getting into a furnace bath the upper scrap layers cause periodical vapor explosions. The shaft heaters create optimal conditions for dioxines formation, which emit into atmosphere. It was shown, that accounting Russian economic and nature conditions, the metal charge drying and heating in modified charging buckets by the heat of burnt natural gas or other additional fuel is optimal. The proposed technical solution enables to burnt off organic impurities ecologically safely, to melt down ice, to evaporate the wetness in the scrap as well as to heat the charge as enough as the charging logistics enables it. The method was implemented at several Russian steel plants. Technical and economical indices of scrap metal drying in buckets under conditions of EAF-based shop, containing two furnaces ДСП-100, presented.

Perspectives and Regulation of the Russian Market for Project-based Transactions under the Kyoto Protocol

2008 ◽  
pp. 108-125
Author(s):  
K. Zavodov
Keyword(s):  
Energy Efficiency ◽  
Market Mechanism ◽  
Point Of View ◽  
Market Regulation ◽  
Foreign Investments ◽  
Russian Market ◽  
Increase Energy Efficiency ◽  
New Form ◽  
Contract Structure ◽  
Carbon Fund

Project-based transactions (PBTs) are a market mechanism of attracting foreign investments in order to abate greenhouse gas emissions and increase energy efficiency of the country’s enterprises. The article provides a classification and analyzes advantages and drawbacks of PBTs from the point of view of a host country. The main trends and factors determining the dynamics of the PBT market are described. Given that Russia currently lags behind the leaders of the PBT market, an incorporation of a state carbon fund is put forward with an aim of channelling PBTs through it. This paper proposes a form of PBT market regulation by incorporating an option mechanism into the contract structure of a transaction. A comparison of the new form of regulation with the tools that are currently in use in Russia and other countries demonstrates its greater economic efficiency under uncertainty.

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