scholarly journals МОДЕЛЮВАННЯ ПРОЦЕСУ ВЗАЄМОДІЇ ІМПУЛЬСНОГО СТРУМЕНЯ ІЗ ЗАГОТОВКОЮ ПРИ ЕЛЕКТРОГІДРАВЛІЧНОМУ НА-ВАНТАЖЕННІ

2021 ◽  
pp. 65-77
Author(s):  
М. Е. Тараненко ◽  
А. Г. Нарыжный
Keyword(s):  
Energy Efficient ◽  
Pulse Generator ◽  
Pulse Current ◽  
Discharge Zone ◽  
Heat Power ◽  
Current Generator ◽  
Electrical Parameters ◽  
Real Process ◽  
Work Of Deformation ◽  
To Receive

The eg-stamping of thin-leaf-sized parts has shown its technical and economic efficiency, including the ability to receive parts of ultrahon-thread accuracy. At the same time, the workpieces are loaded on the eg-presses of large intensive energy (up to 500 kJ), which have the possibility of space-time loading control. Such management is carried out using multi-terminated discharge blocks in which dozens of discharge cavities are combined into one. The controlled parameters can be the electrical parameters of tens of discharge circuits of the current pulse generator, the volume and step of the arrangement of the discharge cavities, their height to the workpiece, as well as the sequence of discharges in time (simultaneous or with a shift in the time of EG-discharges in adjacent discharge cavities). The choice of rational ranges of these parameters is impossible without numerical simulation of processes occurring in the discharge volume of the entire block.In the simulation, the processes of heat power is comprehensively considered with the EG-discharge, the formation and propagation of the vapor-gas bubble, which generates a flooded stream of liquid, and deforming the supple billet when exposed to such a jet.The results of numerical experiments in the LS-DYNA environment using the ALE method with the EG-discharge in a single bit (submersible) chamber, in two and three neighboring conditions with different variable conditions are set: the distance from the discharge zone to the workpiece (discharge distance) and the displacement of the time of two and three discharges in the adjacent discharges. As compared parameters were selected: movement of the billet and their speed, the distribution of deformations on the surface of the workpiece and the work of deformation. The adequacy of the model of the real process is shown. An energy-efficient energy-generating cell is proposed for generating EG-discharges from a multi-mounted pulse current generator.

Preconditioned Wire Array Z-Pinch On A Double-Pulse Current Generator

2017 ◽  
Author(s):  
Jian Wu ◽  
YiHan Lu ◽  
Daoyuan Zhang ◽  
Xingwen Li ◽  
Shenli Jia ◽  
...  
Keyword(s):  
Pulse Current ◽  
Wire Array ◽  
Double Pulse ◽  
Current Generator ◽  
Z Pinch

A Direct Measurement Method of Building’s Shunt Coefficient

2012 ◽  
Vol 241-244 ◽  
pp. 885-888
Author(s):  
Xiao Chun Zhang ◽  
Xiu Bin Sun ◽  
Xiang Yong Mou
Keyword(s):  
Direct Measurement ◽  
Measurement Method ◽  
Pulse Current ◽  
Induction Coil ◽  
Experimental Results ◽  
Current Generator ◽  
Digital Oscilloscope ◽  
Direct Measurement Method

The shunt coefficient of a model of constructions was measured by a pulse current generator, an induction coil, a digital oscilloscope. The experimental results demonstrate that the method is effective, the distribution of pulse current in a buildings can be directly measured without damage.

scholarly journals Heat power analysis of performance indicators blast furnace No. 3 PJSC «AZOVSTAL IRON & STEEL WORKS» with natural gas and pulverized coal after oven overhaul of blast furnace

2020 ◽  
pp. 47-61
Author(s):  
A.L. Chaika ◽  
B.V. Kornilov ◽  
A.A. Moskalina ◽  
V.V Lebed ◽  
M.G. Dzhigota ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Comparative Analysis ◽  
Natural Gas ◽  
Energy Efficient ◽  
Pulverized Coal ◽  
Pig Iron ◽  
Heat Power ◽  
Technical And Economic Indicators ◽  
Steel Works

In 2019, according to the technological assignment of the Iron and Steel Institute (ISI), the reconstruction of the blast furnace (BF) No. 3 of PJSC «AZOVSTAL IRON & STEEL WORKS» was carried out for the long-term energy-efficient production of pig iron with using pulverized coal (PCI) up to 180 kg/t with a change in the profile according to the technological task of ISI. The design of the BF No. 3 profile corresponds to the best world solutions for furnaces efficiently working with pulverized coal, and the furnace was equipped with five mathematical models of ISI («Horn», «Mine», «Heat losses», «Loading», «Slag»). Specialists of ISI developed recommendations and carried out technological support for the operation of BF No.3, which made it possible to increase the removal of pig iron from the design 2.1 t/m3 to 2.27 t/m3 and achieved the best indicators in the blast furnace workshop in terms of coke and equivalent fuel consumption by increasing the productivity of the burden system, using a rational burden loading matrix, using a rational pressure drop in the furnace, which allows the maximum use of the power of the blower machine, forcing the furnace with technical oxygen and other measures. Using the heat power model of I.D. Semikin was made a comparative analysis of the best for six months indicators of thermal performance and technical and economic indicators of BF №3 of PJSC «AZOVSTAL IRON & STEEL WORKS», with a volume of 1800 m3 before (work with natural gas) and after major repairs (work with pulverized coal and with natural gas). Using the exergy method of analysis based on the results of calculating heat and power balances, a comparative analysis of changes in the energy efficiency and environmental indicators of BF No. 3 before and after its major repairs was carried out. It shown the expediency of integrated mastering of operating modes and modernization of the blast furnace for long-term and energy-efficient operation with pulverized coal. It disclosed the mechanism for improving the technical and economic indicators of work after major repairs by changing the heat and power conditions of the blast furnace. Its shown Improvement of exergy efficiency factor and environmental performance of BF No. 3 after major repairs.

scholarly journals ENERGY EFFICIENT BANDWIDTH CONSTRAINED QOS ENABLED MULTIPATH ROUTING FOR MANETs

2011 ◽  
pp. 270-277
Author(s):  
N. Sumathi ◽  
Antony Selvadoss Thanamani
Keyword(s):  
Routing Protocol ◽  
Energy Efficient ◽  
Performance Metrics ◽  
Delivery Ratio ◽  
Probability Method ◽  
Efficient Operation ◽  
Available Bandwidth ◽  
Packet Delivery ◽  
Energy Conserving ◽  
To Receive

In mobile adhoc networks, node has a finite and decreasing energy. Energy saving mechanism is important for the efficient operation of the battery powered network. When a node is transmitting a packet, all the neighboring nodes overhear. Overhearing improves routing efficiency but consumes more energy. Overhearing is caused by the fact that when a unicast transmission is carried out in a node’s immediate neighborhood, it does not have any mechanism for not to receive that packet. Energy consumption during overhearing is same as that during reception. Goal of this work is to develop an energy conserving mechanism due to overhearing. To minimize energy, probability method is applied to randomly select number of overhearing nodes. This probability based overhearing is incorporated into log based pipelined ABM (Available Bandwidth Measurement) and integrated with AOMDV routing protocol. This proposed approach is implemented in NS2 simulator. Simulation results are presented to demonstrate the performance metrics such as throughput, packet delivery ratio, end-end latency, routing overhead, energy and bandwidth consumption of the network.

Porosification Analysis on the Effect of Resistivity Dependence on N-Type Pulsed Porous Silicon

2020 ◽  
Vol 301 ◽  
pp. 12-17
Author(s):  
Nurul Hanida Abd Wahab ◽  
Alhan Farhanah Abd Rahim ◽  
Ainorkhilah Mahmood ◽  
Noorezal Atfyinna Mohammed Napiah ◽  
Rosfariza Radzali ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Surface Morphology ◽  
Direct Current ◽  
Current Density ◽  
Cycle Time ◽  
Pulse Generator ◽  
Pulse Current ◽  
Etching Process ◽  
Homogeneous Structure ◽  
Photoelectrochemical Etching

A set of n-type porous silicon (PS) layers were fabricated by photoelectrochemical etching using direct current (DC) and pulse current (PC) techniques. The study aims to compare the effect of different resistivity (5 Ω and 10 Ω) on the formation of the PS structure. The samples were etched in a solution of HF:C2H6O with a composition ratio of 1:4. The etching process were done for 30 minutes with the current density of J = 10 mA/cm2. In the time of PC etching process, the current was supplied through a pulse generator with 14 ms cycle time (T) which the on time (Ton) set to 10 ms and pause time (Toff) set to 4 ms respectively. The samples were then being characterized in terms of surface morphology by using FESEM, AFM and XRD. Through the FESEM results, it can be seen that sample with 10 Ω resistivity which using PC form a more homogeneous structure of pores as compared to other samples.

scholarly journals Analysis of relation between edging ratio and deformation work done in pre-forming of workpiece by bulk buckling

2018 ◽  
Vol 178 ◽  
pp. 02003 ◽  
Author(s):  
Volodymyr Kukhar ◽  
Elena Balalayeva ◽  
Andrii Prysiazhnyi ◽  
Oleg Vasylevskyi ◽  
Iryna Marchenko
Keyword(s):  
Energy Efficient ◽  
Power Indices ◽  
Forming Process ◽  
Pressure Work ◽  
Similar Shape ◽  
Deformation Work ◽  
Work Of Deformation ◽  
Work Done

The results of studies of energy-power indices (contact face pressure, work of deformation) during upsetting with buckling of relatively high workpieces with upsetting ratio 3.5 to 6.0 are summarized in the paper. The relation between work of deformation at the bulk buckling and edging ratio, and similar shape ratios was established. The results are shown that buckling pass is an energy-efficient way of workpieces shaping for bent forgings or dual-forming of some products and belong to the class of dieless (impression-free) bulk pre-forming process.

Effect of Pulse Current on Mechanical Behavior of High Temperature Titanium Alloy Ti55

2021 ◽  
Vol 1035 ◽  
pp. 25-31
Author(s):  
Hai Feng Wan ◽  
Ai Jun Xu ◽  
Yun Long Huang ◽  
Ze Jun Tang
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Tensile Properties ◽  
Pulse Current ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Electrical Parameters ◽  
Dislocation Movement ◽  
High Pulse ◽  
Material Forming

The effects of pulse current on the tensile properties of high temperature titanium alloy Ti55 were investigated by pulse current assisted uniaxial tensile test under different electrical parameters. It was found that with the increase of peak current and pulse width, the tensile properties of Ti55 are significantly improved. At the same time, the pulsation effect of current on the mechanical properties of Ti55 was investigated. The results show that the tensile displacement of low pulsation group was higher, while the elongation of high pulsation group was higher. In order to explore the mechanism of pulsation effect of current, EBSD was adopted. The results indicated that high pulse current can significantly promote the dislocation movement and recrystallization. In addition, some macrozones was found in low pulsation group, which indicated that high pulsation current was more suitable for material forming than low pulsation current.

Two-Section Pulse Current Generator for Concrete and Rocks Destruction by Splitting Off*

2017 ◽  
Vol 45 (11) ◽  
pp. 3042-3045 ◽  
Author(s):  
Artem S. Yudin ◽  
Nikita V. Voitenko ◽  
Natalia S. Kuznetsova
Keyword(s):  
Pulse Current ◽  
Current Generator
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