JUSTIFICATION OF THE POSSIBILITY OF RATIONING TECHNOLOGICAL PARAMETERS OF VIBROABRASIVE PROCESSING IN ORDER TO INCREASE THE RELIABILITY OF THE PROCESSING PROCESS

2020 ◽  
Author(s):  
G.A. Prokopets ◽  
◽  
A.A. Prokopets ◽  
T. Erina ◽  
◽  
...  
Keyword(s):  
Wear Rate ◽  
Quality Indicators ◽  
Processing Time ◽  
General Structure ◽  
Oscillation Amplitude ◽  
Technological System ◽  
Technological Parameters ◽  
Working Chamber ◽  
The Stability ◽  
Wear Tolerance

The paper considers the General structure of the technological system of vibration abrasive processing, the issues of ensuring the stability of quality indicators formed during the final vibration abrasive processing. The results of the study of the influence of the working chamber oscillation amplitude and processing time on the wear rate of the processing medium are presented. An example of determining the wear tolerance of the processing medium based on the roughness tolerance is given.

scholarly journals Standardization of the technological parameters of vibratory abrasion as a tool for process reliability enhancement

2020 ◽  
Vol 175 ◽  
pp. 05006
Author(s):  
Galina Prokopetz ◽  
Anna Azarova ◽  
Anatoliy Prokopetz ◽  
Elena Murugova
Keyword(s):  
Wear Rate ◽  
Quality Indicators ◽  
Processing Time ◽  
General Structure ◽  
Oscillation Amplitude ◽  
Technological System ◽  
Technological Parameters ◽  
Working Chamber ◽  
Process Reliability ◽  
The Stability

This paper deals with the general structure of the technological system of vibration abrasive processing and main issues of ensuring the stability of quality indicators formed in the final vibration abrasive processing. The research results of the working chamber oscillation amplitude influence and processing time on the wear rate of the processing environment are presented. The sample of determining the wear tolerance of the processing environment based on the roughness tolerance is presented.

scholarly journals THE CHOICE OF FACTORS OF INFLUENCE ON VIBRO-CENTRIC SEPARATION OF LIQUID INHOMOGENEOUS RAW MATERSALS

2021 ◽  
pp. 50-56
Author(s):  
Yurii Polievoda ◽  
Alla Solomon
Keyword(s):  
Quality Indicators ◽  
Processing Time ◽  
Raw Materials ◽  
Angular Rate ◽  
Oscillation Amplitude ◽  
Response Surfaces ◽  
Influential Factors ◽  
Optimization Parameters ◽  
Criteria For Evaluation ◽  
Power And Energy

The development of modern equipment and technology leads to healthy competition, which in turn allows you to freely choose a machine or installation for the separation of liquid inhomogeneous systems. Each production when choosing equipment takes into account the relevant factors and its specifics. Mathematical and statistical planning of a multifactorial experiment was used to refine the glycerin quality indicators and determine their weight. The article constructs the response surfaces of the optimization criteria, which allow us to clearly illustrate the dependences of the values of the mass fraction of pure glycerin and energy consumption on individual optimization parameters. The research method includes the selection of optimal modes of operation of the vibrocentric machine for purification of liquid glycerol-containing raw materials according to technical and economic criteria for evaluation and determination of quality indicators of purified glycerol with variation of processing time, process temperature, etc. During the study, special attention was paid to the main operating parameters of this vibrating machine, namely: amplitude-frequency, power and energy. The efficiency of the process of vibration-based purification of crude glycerol was evaluated on such parameters as vibration control, angular rate of flow, rate of temperature. The recommendations of the second basic parameters of the lateral period were determined in accordance with the second set of the second order. Analyzing the results of studies of vibration-centrifugal separation of liquid inhomogeneous raw materials, it can be argued that the most influential factors in the separation of these products are the rotor speed, vibration shaft speed, oscillation amplitude, power, temperature and processing time.

scholarly journals The Main Ways to Control the Efficiency of Vibration Abrasive Processing

2021 ◽  
Vol 2131 (5) ◽  
pp. 052021
Author(s):  
Anatoly Prokopets ◽  
Vitaly Shenstein ◽  
Tatiana Prokopets ◽  
Elena Melnikova
Keyword(s):  
Adaptive Control ◽  
Processing Time ◽  
Experimental Studies ◽  
Working Environment ◽  
Necessary Condition ◽  
Technological Operation ◽  
Working Chamber ◽  
Working Medium ◽  
Main Factors ◽  
The Stability

Abstract The paper considers the main factors affecting the stability of the technological operation of vibration abrasive processing. The main ways of increasing the efficiency of processing by controlling its stability are revealed. The scheme of adaptive control of the process of vi-broabrasive machining is proposed according to the criterion of stability of the volume of loading of the working chamber, as one of the main factors that determine the stability of the cutting ability of the working medium (tool). The work substantiates the relevance of increasing the efficiency of vibration processing, as one of the promising methods of finishing. As a criterion of efficiency, the processing time was taken to ensure the specified quality indicators of the processed parts. Taking into account the peculiarities of vibroabrasive processing, three options for determining the minimum required processing time are proposed. In order to identify ways to increase the efficiency of processing, the analysis of the structure of the technological system was carried out, the classification of its elements was made. Based on the results of the analysis, it was concluded that a necessary condition for increasing the efficiency of processing is to ensure the stability of the parameters of the technological operation. In this regard, the main factors influencing the stability of the technological operation of vibration abrasive processing using the Ishikawa diagram are highlighted. The paper also presents the results of experimental studies of the influence of the volume of loading the working chamber on the cutting ability of the tool (working environment). Based on the results of theoretical and experimental studies, the main ways of increasing the efficiency of processing, including by controlling its stability, have been determined. The scheme of adaptive control of the process of vibroabrasive processing according to the criterion of stability of the volume of loading of the working chamber, as one of the main factors determining the stability of the cutting ability of the working medium (tool), is proposed.

scholarly journals JUSTIFICATION OF CONSTRUCTIVE AND TECHNOLOGICAL PARAMETERS OF A VIBRATION DRYER GRAIN SEEDS AND VEGETABLES FOR THE LAST-SELECT STATIONS

2020 ◽  
pp. 71-80
Author(s):  
Leonid Yaroshenko
Keyword(s):  
Energy Consumption ◽  
Oscillation Amplitude ◽  
Convective Drying ◽  
Drying Process ◽  
Technological Parameters ◽  
Drying Time ◽  
Atmospheric Air ◽  
Working Chamber ◽  
Heating And Cooling ◽  
Vibration Parameters

The paper analyzes the current state and prospects of further development of the technology of post-harvest treatment of grain seeds and vegetables, in particular its drying, on the conditions of which depends the quality of the sowing material. One of the ways to solve this problem is to apply convective drying in a pseudo-liquefied state with periodic heating and cooling of the seeds, which allows to maintain the temperature of the dried seeds within the specified limits and thereby maintain its high sowing qualities. To study the parameters of such drying at the Vinnitsa National Agricultural University a laboratory sample of a vibrating dryer with a U-shaped working chamber for drying granular or fine-grained products was created, which allows the temperature and flow of the fluid to be controlled during drying, as well as the oscillation amplitude of the drying chamber. As a result of studies of vibration parameters influence of the working chamber of the dryer (the trajectory of its oscillations, vibration speed and vibration acceleration), the temperature and flow rate of the coolant (atmospheric air) and its humidity, the possibility of a significant reduction of energy consumption, increase of intensity and reduction of drying time is established. As a result of the research, the design and development of a vibrating convective dryer of intermittent heating with a vertical drive shaft was proposed, which allows to combine the advantages of convection vibrating tray and mine dryers, in which, in order to intensify the drying process and reduce the energy consumption, the phenomenon of thermodiffusion, or the movement of moisture in a material under the action of a temperature gradient (which coincides in direction with the flow of heat), that greatly reduces the energy consumption and duration of the drying process. Consistent alternation of periods of heating of particles of granular products with heated air and their cooling with atmospheric air, due to the phenomenon of thermodiffusion, significantly intensifies the drying process and reduces its energy intensity and leads to an increase in the productivity of the vibration dryer.

scholarly journals PLANNING A MULTI-FACTOR EXPERIMENT FOR DETERMINING RATIONAL PARAMETERS OF THE VIBRATION MACHINE OPERATION

2020 ◽  
pp. 5-14
Author(s):  
Oleh Tsurkan ◽  
Ruslan Horbatiuk ◽  
Dmytro Prysiazhniuk
Keyword(s):  
Angular Velocity ◽  
Vibration Amplitude ◽  
Processing Time ◽  
Angular Speed ◽  
Drive Shaft ◽  
Technological Parameters ◽  
Vibration Machine ◽  
Working Chamber ◽  
Optimal Experiment ◽  
Multifactorial Experiment

The approaches and methods of improving the quality and efficiency of agricultural machinery repair are of priority importance in Ukraine today. The tough competitive environment in the interstate and domestic market of technical services dictates its own terms. One of the promising research methods is the planning of an experiment in the optimization of multifactorial processes, such as vibration strengthening processing of agricultural machinery parts. The object of the research in this article was the technological process of finishing, cleaning and strengthening processing of parts of tillage machines with their surface plastic vibration deformation. The purpose of the work was to plan a multifactorial experiment for the theoretical determination of the compromise parameters of the operation of a vibration machine with an activator of the movement of the working medium for strengthening the treatment of the working bodies of tillage machines. The task of the work was to: analyze research and publications on the basics of probability theory, mathematical statistics, foundations of correlation, variance and regression analyzes, planning an optimal experiment; obtain the coefficients of complex equations of multiple regression of the 2nd order and plot the dependence of the consumed energy consumption by the developed installation on the amplitude of oscillations of the working chamber, the amplitude of oscillations of the activator, angular velocity of the drive shaft of the working chamber, angular velocity of the drive shaft of the activator, processing time; the height of microroughnesses from the vibration amplitude of the working chamber, the vibration amplitude of the activator, the angular velocity of the drive shaft of the working chamber, the angular velocity of the drive shaft of the activator, the processing time; surface hardness on the vibration amplitude of the working chamber, vibration amplitude of the activator, angular velocity of the drive shaft of the working chamber, angular velocity of the drive shaft of the activator, processing time; based on the results of the research and testing of the developed installation on the basis of the constructed response surfaces of the processes under study, to determine the rational technological parameters of its operation, the compromise value of which can be obtained by the Cramer method in the mathematical environment "Mathcad 15". The research methodology was based on mathematical statistics, correlation, variance and regression analyzes, planning an optimal experiment. In scientific work, based on the results of a multifactorial experiment, a mathematical model was obtained in the form of multiple second-order regression, which adequately describes the technological process under study. Compromise technological parameters of the investigated process were obtained, which are: the amplitude of oscillations of the working chamber - 2-4 mm; the vibration amplitude of the activator is 1.5-2.5 mm; the angular speed of the drive shaft of the working chamber - 115-120 rad/s; the angular speed of the drive shaft of the activator 130-145 rad/s; processing time - 80 min.

Criteria for evaluation of the coordinate measurements quality of parts geometric parameters at pilot-experimental production

2019 ◽  
pp. 3-8
Author(s):  
N.Yu. Bobrovskaya ◽  
M.F. Danilov
Keyword(s):  
Quality Indicators ◽  
Quality Management System ◽  
Technical Specification ◽  
Experimental Production ◽  
Technological Heredity ◽  
Coordinate Measurements ◽  
Reasonable Choice ◽  
The Stability ◽  
Geometric Elements

The criteria of the coordinate measurements quality at pilot-experimental production based on contemporary methods of quality management system and traditional methods of the measurements quality in Metrology are considered. As an additional criterion for quality of measurements, their duration is proposed. Analyzing the problem of assessing the quality of measurements, the authors pay particular attention to the role of technological heredity in the analysis of the sources of uncertainty of coordinate measurements, including not only the process of manufacturing the part, but all stages of the development of design and technological documentation. Along with such criteria as the degree of confidence in the results of measurements; the accuracy, convergence, reproducibility and speed of the results must take into account the correctness of technical specification, and such characteristics of the shape of the geometric elements to be controlled, such as flatness, roundness, cylindrical. It is noted that one of the main methods to reduce the uncertainty of coordinate measurements is to reduce the uncertainty in the initial data and measurement conditions, as well as to increase the stability of the tasks due to the reasonable choice of the basic geometric elements (measuring bases) of the part. A prerequisite for obtaining reliable quality indicators is a quantitative assessment of the conditions and organization of the measurement process. To plan and normalize the time of measurements, the authors propose to use analytical formulas, on the basis of which it is possible to perform quantitative analysis and optimization of quality indicators, including the speed of measurements.

scholarly journals Simulation of the Load Evolution of an Anchoring System under a Blasting Impulse Load Using FLAC3D

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xigui Zheng ◽  
Jinbo Hua ◽  
Nong Zhang ◽  
Xiaowei Feng ◽  
Lei Zhang
Keyword(s):  
Shear Stress ◽  
Dynamic Response ◽  
Axial Force ◽  
Mechanical Characteristics ◽  
Oscillation Amplitude ◽  
Anchoring System ◽  
Impulse Load ◽  
The Stability ◽  
Calculation Software ◽  
Dynamic Perturbation

A limitation in research on bolt anchoring is the unknown relationship between dynamic perturbation and mechanical characteristics. This paper divides dynamic impulse loads into engineering loads and blasting loads and then employs numerical calculation software FLAC3Dto analyze the stability of an anchoring system perturbed by an impulse load. The evolution of the dynamic response of the axial force/shear stress in the anchoring system is thus obtained. It is revealed that the corners and middle of the anchoring system are strongly affected by the dynamic load, and the dynamic response of shear stress is distinctly stronger than that of the axial force in the anchoring system. Additionally, the perturbation of the impulse load reduces stress in the anchored rock mass and induces repeated tension and loosening of the rods in the anchoring system, thus reducing the stability of the anchoring system. The oscillation amplitude of the axial force in the anchored segment is mitigated far more than that in the free segment, demonstrating that extended/full-length anchoring is extremely stable and surpasses simple anchors with free ends.

A New CRONE Suspension: More Compact and More Efficient: Part 2—Synthesis and Achievement

2009 ◽  
Author(s):  
Audrey Rizzo ◽  
Xavier Moreau ◽  
Alain Oustaloup ◽  
Vincent Hernette
Keyword(s):  
Transfer Function ◽  
Fractional Derivative ◽  
Vibration Isolation ◽  
Suspension System ◽  
Technological Parameters ◽  
Stability Degree ◽  
Parallel Arrangement ◽  
The Stability ◽  
Crone Suspension ◽  
The Ideal

In a vibration isolation context, fractional derivative can be used to design suspensions which allow to obtain similar performances in spite of parameters uncertainties. This paper presents the synthesis and the achievement of a new Hydractive CRONE suspension system. After the study of the different constraint in suspension in the first paper, the ideal transfer function of the hydractive CRONE suspension is created and simulated in different case. Then a method to determine the technological parameters is proposed. A parallel arrangement of dissipative and capacitive components and a gamma arrangement are compared. They lead to the same unusual performances: the stability degree robustness and the rapidity robustness.

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