Closure to “Discussion of ‘The Confined-Discharge Plasma Generator With Local Fluid Constriction’” (1972, ASME J. Basic Eng., 94, pp. 823–824)

1972 ◽  
Vol 94 (4) ◽  
pp. 824-824
Author(s):  
J. R. Mahan ◽  
C. J. Cremers
Keyword(s):  
Discharge Plasma ◽  
Plasma Generator

The impact of the workability of an automated technological system on the effective implementation of the production program when processing tools in glow discharge plasma generators

2021 ◽  
pp. 58-65
Author(s):  
V.A. Logvin ◽  
◽  
S.A. Sheptunov ◽  
Keyword(s):  
Glow Discharge ◽  
Discharge Plasma ◽  
Functional Dependence ◽  
Plasma Generator ◽  
Glow Discharge Plasma ◽  
Optimal Time ◽  
Time Interval ◽  
Production Program ◽  
The Impact ◽  
Plasma Generators

The conditions for the hardening of tools in accordance with the author’s technological routes in the optimal time interval are considered using the functional dependence of the serviceability of plasma generators. This dependence takes into account the workability of the technical devices involved in processing the laying batch of tools in the speci ed time interval. The probability of performing the production process in the estimated time is represented by the product of the trouble-free operation of each glow discharge plasma generator involved in the nishing processing of tools that require a different type of plasma exposure in a certain sequence and duration.

The Confined-Discharge Plasma Generator With Local Fluid Constriction

1972 ◽  
Vol 94 (4) ◽  
pp. 818-823 ◽  
Author(s):  
J. R. Mahan ◽  
C. J. Cremers
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Discharge Plasma ◽  
Fluid Dynamic ◽  
Plasma Generator ◽  
Energy Conversion Efficiency ◽  
Axial Position ◽  
Working Fluid ◽  
The Mean ◽  
Cold Gas

Normally the energy conversion efficiency of a confined-discharge plasma generator is inversely related to the mean enthalpy of the effluent plasma jet. The present paper describes a technique for increasing both the energy conversion efficiency, defined as the net fraction of the electrical power input transferred to the working fluid, and the mean enthalpy, defined as the net energy transferred to the working fluid per unit mass. A portion of the working fluid is introduced to the discharge through a narrow circumferential slit in the confining duct wall. Heat transfer and fluid dynamic effects associated with this high velocity inflow of cold gas cause the local discharge column to become highly constricted. Concomitant with this local fluid constriction (LFC) is a sharp increase in the local power density, resulting in enhanced energy transfer to the cold gas. Experimental results suggest that for optimum operation the gas injection slit should be located slightly upstream of the axial position where the discharge becomes thermally fully developed.

Investigation into geometric effect in capillary discharge plasma generator using an improved ablation model

2020 ◽  
Vol 53 (23) ◽  
pp. 235201
Author(s):  
Jiangbo Zhang ◽  
Xingwen Li ◽  
Li Chen ◽  
Yuhua Zhao ◽  
Lei Liang ◽  
...  
Keyword(s):  
Discharge Plasma ◽  
Plasma Generator ◽  
Capillary Discharge ◽  
Geometric Effect ◽  
Ablation Model

AUTOMATION OF CONTROL PROCESS TO ENSURE TOOL QUALITY DURING FINISHING WITH GLOW DISCHARGE PLASMA

2021 ◽  
Vol 2021 (8) ◽  
pp. 14-21
Author(s):  
Vladimir Logvin ◽  
Tatyana Karlova
Keyword(s):  
Neural Network ◽  
Quality Control ◽  
Control System ◽  
Glow Discharge ◽  
Discharge Plasma ◽  
Plasma Generator ◽  
Glow Discharge Plasma ◽  
Engineering Process ◽  
The Neural Network

Work purpose: the development of conditions for control automation ensuring tool essential qualities at the stage of finishing with glow discharge plasma. Investigation methods: based on the peculiarities of a human mental process the formation of an electronic model of a neural control system on the basis of engineering process monitoring in industry promoted cybernetic method carrying out for the increase of effectiveness and quality control during the management. The formation of an investigation process for computer technology use at the solution of the problem to ensure specified quality at the realization of engineering processes for metal working tool strengthening in the plasma generator of a glow discharge allowed creating an efficient system of control. The creation of conditions for the fulfillment of human cognitive potentialities with the high degree of similarity such as identification, accumulation and dissemination or transfer of information in the form of electromagnetic pulses similar to neural exchange allows optimizing a control system of quality of product strengthening in the plasma generator of a glow discharge. The formulation of a management solution in the form of the chain of commands in the neural network of the control system of the plasma generator of a glow discharge is formed in accordance with phenomena forming output responses and conditions ensuring their formation. Investigation results: for setting an optimum field of investigations and, accordingly, for increasing effectiveness of the automated control system of finishing quality under the glow discharge plasma impact during the whole engineering process the use of unique potentialities of continuous neural network monitoring is intended. The application of the neural network approach and its unique functions at the formation of the control system using the continuous monitoring of basic engineering process parameters of finishing ensuring specified quality of machining steps realized allows ensuring high repeatability at metal working tool strengthening. In the technological system developed all functions of control and management are based on the use of the neural network approach that allows visualizing its functioning on the monitor in the course of the whole engineering finishing process in the form of graphical dependence. Conclusions: 1. The use of unique potentialities of continuous neural network monitoring allows defining a optimum field of investigations at the lowest cost and accordingly increasing quality of the automated system of finishing quality control at the impact of glow discharge plasma. 2. Depending on material of a tool working part and conditions of tool operation in the surface layer there is formed an essential thermo-dynamic structure with the specified physical-mechanical properties that allows ensuring optimum repeatability. 3. The formation of conditions for the fulfillment with a high degree of similarity human cognitive potentialities such as identification, accumulation and dissemination or transfer of information in the form of electro-magnetic pulses similar to neural exchange allows optimizing a system of quality control of tools strengthened at the stage of glow discharge plasma finishing.

scholarly journals Simulation of the Processing Process in a Glow Discharge Plasma Generator

2021 ◽  
Vol 248 ◽  
pp. 01006
Author(s):  
Vladimir A. Logvin ◽  
Ludmila A. Yvarova
Keyword(s):  
Surface Layer ◽  
Glow Discharge ◽  
Discharge Plasma ◽  
Plasma Generator ◽  
Operating Conditions ◽  
Low Energy ◽  
Learning System ◽  
Glow Discharge Plasma ◽  
Energy Effect ◽  
Forming Tools

A theory has been developed that explains the structure formation in a thin surface layer of a material after low-energy exposure to a glow discharge plasma. This makes it possible to design new methods, technologies and automated devices for the development of an automated technological environment for strengthening various types of tools from various materials. Based on the developed theory, a self-learning system with a developing database was created for monitoring all stages of processing in a glow discharge plasma generator. Any crystal structure can be classified as a complex nonlinear system. When studying the dynamic response of such systems to an external low-energy effect, it was shown that by the time when the nonlinear vibrations stop, the atoms of the crystal lattice are stabilized in new positions. Based on the purpose of the products to be processed in the glow discharge plasma generator, with taking into account their operating conditions, it is possible to increase their production life up to 2 times or more. These technologies should be used at the final stage of the production process because they do not lead to distortion of the shape and size of the working surfaces of products being manufactured. In this case, the residual stresses are redistributed in the surface layer of the material with the formation of an equal structure that improves the running-in conditions of mating parts of devices and mechanisms. For cutting and forming tools, the run-in stage is reduced to the stage of uniform wear.

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