scholarly journals Definition of rational operating modes of a vibratory jaw crusher

2021 ◽  
pp. 56-62
Author(s):  
Ye.O Mishchuk ◽  
I.I Nazarenko ◽  
D.O Mishchuk
Keyword(s):  
Mathematical Model ◽  
Impact Action ◽  
Efficient Operation ◽  
Motion Equations ◽  
Operating Modes ◽  
The Third ◽  
Jaw Crusher ◽  
Elastic Systems ◽  
Definition Of ◽  
The Impact

Due to the continuous development of the building-and-construction industry, it is necessary to design new or modify outmoded industrial equipment. Using jaw crushers with the impact action of crushing plates on material is a perspective line of developing crushing equipment. Purpose. Developing a mathematical model of a vibratory jaw crusher and studying the operational process which is based on the mathematical model in order to design new crushers. Methodology. Definition of the crusher working process is based on the main statements of the theory of mechanical oscillations and the theory of continuous environment. In the motion equations of the crusher the material is taken into account on the basis of a discrete model by a continual parameter. Findings. A physical model is developed on the basis of which motion equations are derived, which include three main conditions of the efficient operation: 1) the elasticity of the second vibrating element must exceed or be equal to crushing force; 2) vibrations of the first and the third vibrating elements must be in phase, and vibrations of the second vibrating element must be in antiphase; 3) the summarized displacement of the second and the third crushing plates must ensure crushing of material. Graphs of the effect of the vibrating elements and elasticity coefficients of elastic systems on the amplitudes of vibrations are plotted and analyzed. On the basis of the motion equations, with consideration for the optimal parameters of the crusher vibrating elements and for the elasticity coefficients of the elastic systems, the amplitude-frequency characteristics of the crusher for different frequency ranges are determined. Set up is an equation describing the displacement of material in the crushing chamber for a time interval required for the crushing plates to be separated. Presented are graphs of dependency of the amplitude of vertical vibrations of the crusher casing on the elasticity of the isolating elastic system, and provided are recommendations for selecting and calculating vibration isolation. Originality. A mathematical model of an experimental vibratory jaw crusher and the characteristics of the experimental crusher are presented, on the basis of which recommendations are given for the selection of energy-efficient operating modes of the crusher. Practical value. Knowledge on the rational values of the frequency ranges for operation of the studied vibratory jaw crusher makes it possible to determine the optimal level of power consumed by the crusher and efficiency in processing materials of different hardness.

EXPERIMENTAL RESEARCH ON COMPRESSION FOAM COOLING DURING ITS DELIVERY AT DIFFERENT AMBIENT TEMPERATURE MODES

2021 ◽  
Vol 4 ◽  
pp. 40-44
Author(s):  
Gumirov A. ◽  
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Low Temperatures ◽  
Empirical Method ◽  
Research Application ◽  
Mass Consumption ◽  
Operating Modes ◽  
Research Findings ◽  
Conducting Research ◽  
The Impact

Purpose. The article describes methodology for conducting research on parameters of compression foam cooling during its delivery through hose-pump systems depending on the operating modes of the foam generating installation. The impact of mass consumption of compression foam on its cooling at low temperatures has been examined. The application of a mathematical model of air-foam mixture movement in hose-pump systems at different temperature modes has been substantiated. Methods. Empirical method-experiment has been used for research. Findings. A number of experiments have been carried out to confirm the developed model of compression foam moving in hose-pump systems at different temperature modes. A mobile installation for generating and delivering compression foam has been used as the object of the research. Inaccuracy in calculations obtained with the help of a mathematical model in comparison with the experimental data is 10% which makes a possible to claim that the model of compression foam moving in hose-pump systems at different temperature modes has been chosen properly. Research application field. According to the obtained data, it is possible to plan means and forces of fire units for extinguishing fires using compression foam at low temperatures. Conclusions. The developed mathematical model of compression foam movement during its delivery through hose-pump systems is confirmed by experimental data. The dependence of mass consumption impact on compression foam cooling when it is delivered through fire hoses at low temperatures has been obtained experimentally.

scholarly journals The Proposal of a Evolutionary Strategy Generating the Data Structures Based on a Horizontal Tree for the Tests

2016 ◽  
Vol 23 (3) ◽  
pp. 145-149
Author(s):  
Marek Żukowicz ◽  
Michał Markiewicz
Keyword(s):  
Mathematical Model ◽  
Evolutionary Algorithm ◽  
Computer Science ◽  
Data Structures ◽  
Evolutionary Strategy ◽  
Future Research ◽  
Object Model ◽  
The Third ◽  
Testing Data ◽  
Definition Of

Abstract The aim of the article is to present a mathematical definition of the object model, that is known in computer science as TreeList and to show application of this model for design evolutionary algorithm, that purpose is to generate structures based on this object. The first chapter introduces the reader to the problem of presenting data using the TreeList object. The second chapter describes the problem of testing data structures based on TreeList. The third one shows a mathematical model of the object TreeList and the parameters, used in determining the utility of structures created through this model and in evolutionary strategy, that generates these structures for testing purposes. The last chapter provides a brief summary and plans for future research related to the algorithm presented in the article.

scholarly journals دلالة الباء التضمنية و المطابقية في آية الوضوء

2022 ◽  
Vol 6 (1) ◽  
Author(s):  
جيران ، حمد علي هارب
Keyword(s):  
Point Of View ◽  
The Third ◽  
The People ◽  
The Difference ◽  
Definition Of ◽  
The Impact

This research discusses the significance of the underlying and corresponding (B) in the verse of ablution .It consists of a preface , four chapters and a termination .Within the limits of the preface , it dealt with the clarification of the importance of the research .In the first chapter , it dealt with the definition of the underlying significance according to the jurists point of view , also the scientists, point of view who support the underlying significance and the people who agree with them , as well as the aspects of the Hanafia’s and the shafia's inference regarding the implication.   The research also deals with the definition of the corresponding significance according to the jurists' point of view as well as the scientists' point of view who support the correspondence of the (B) significance .These people are the Malikia and the Hanablah and the people who agree with them as well as the aspects of their inference in this issue .The third chapter tackles the more acceptable significance of the two discussed in the former chapters .The final one clarifies the impact of the difference between the underlying and the corresponding (B) according to the jurists' point of view .Finally the research is concluded by the most important deductions.

scholarly journals MATHEMATICAL MODEL OF UNDERWATER DEMINING BY DIPPER DIVERS OF THE SESU

2021 ◽  
Vol 6 (166) ◽  
pp. 175-183
Author(s):  
I. Soloviev
Keyword(s):  
Mathematical Model ◽  
Emergency Response ◽  
Emergency Situation ◽  
Response Process ◽  
Special Means ◽  
Operational Activities ◽  
Definition Of ◽  
The Impact ◽  
The Mathematical Model ◽  
Technical Recommendations

It is shown that the problem of improving the effectiveness of prevention of emergencies related to the underwater location of explosive objects is relevant. An important and unresolved part of the problem is the lack of a mathematical model of the emergency response process associated with the underwater location of an explosive device in general. Based on this, the object of the study was the elimination of an emergency situation related to the underwater location of explosive objects, and the subject of the study – the process of operational activities of personnel of the underwater demining department of a group of special diving rescue team. The aim of the work is to develop a mathematical model of the emergency response process related to the underwater location of an explosive object as a process of functioning of the system "emergency – special means of underwater demining – diver-sapper", which should be the basis for substantiation of operational and technical recommendations. increasing the efficiency of underwater demining by diver sappers without reducing their level of safety. It is shown that the mathematical model of underwater demining by a diver-sapper is a system of three analytical dependences. The first is a functional that describes the process of underwater demining in the form of a three-factor polynomial model. The second allows us to present this functionality as a set of one-factor models. The third provides the definition of weights in solving a multifactor problem. It is noted that such a model allows to proceed to the substantiation of operational and technical recommendations to the management of the group of special diving works. The advantage of the new scientific result is the ability to obtain both quantitative estimates of the impact of the direct components of the system "diver-sapper – special means of underwater demining – underwater location of an explosive object" and their relationship. The disadvantage is the large number of experimental results that must be obtained to implement the selected plan.

Analysis of vibrations for a vibrating jaw crusher when interacting with material

2021 ◽  
pp. 26-31
Author(s):  
A. E. Shokhin ◽  
G. Ya. Panovko ◽  
I. P. Lyan
Keyword(s):  
Vibration Mode ◽  
Excitation Frequency ◽  
Design Parameters ◽  
Operating Modes ◽  
Jaw Crusher ◽  
Stable Periodic ◽  
The Impact ◽  
Excitation Conditions ◽  
Main Operating ◽  
Selection Of

A model of a vibrating jaw crusher (VJC) with self-synchronizing unbalanced vibration exciters is considered with account of the impacts between the jaws and the material being processed. Numerical modeling is used to establish the influence of the initial gap between the jaws and the material and of the velocity recovery factor upon impact on the synchronization of vibration exciters rotation and jaw vibrations, on the excitation frequency ranges of stable periodic vibroimpact regimes, and on the impact velocities between the jaws. The analysis results indicate that a change in the conditions of contact between the jaws and the material being processed leads to a change in the frequency ranges of the stable antiphase synchronization of vibration exciters rotation, as well as in the excitation frequency ranges of steady single-period vibroimpact regimes for the motion of the system, considered as the main operating modes of the VJC. The impact-like nature of the interaction between the jaws and the material being processed suggests the possible multimodality of the system, which explains some of the effects observed in practice and manifested in changes in the periodicity of the vibroimpact regime and in the vibration mode of the jaws at a constant excitation frequency. Therefore, the vibroimpact-based model proposed for the VJC and its dynamics analysis results may be used to design and improve vibrating jaw crushers with the selection of reasonable design parameters and the most effective vibration excitation conditions. The work was carried out with the financial support of the RFBR, project No. 18-08-01491_a.

Divorce in Abutia

Africa ◽  
1982 ◽  
Vol 52 (04) ◽  
pp. 48-66 ◽  
Author(s):  
Michel Verdon
Keyword(s):  
Marital Instability ◽  
Colonial Rule ◽  
Quantitative Survey ◽  
The Third ◽  
Volta Region ◽  
Definition Of ◽  
Opening Paragraph ◽  
The Impact ◽  
Adequate Analysis

Opening ParagraphLike most southern Ghanian populations, the Abutia Ewe – one of the numerous ‘village leagues’ which compose the northern part of Eweland (Volta region)– have experienced far-reaching transformations in the last century, and nowhere more radically than in their matrimonial practices. In this article, I wish to concentrate on two aspects of these practices, namely the definition of marriage and the incidence of divorce.Indeed, an adequate analysis of divorce requires some heuristic tools which enable us to decide whether particular couples are ‘married’ or not, a procedure made extremely difficult in the case of Abutia because of the changes in their definition of marriage. In the first part of the article, I shall briefly survey these changes and discuss the definitional problems they raise and, in the second, present the main findings of a quantitative survey which helps to measure the impact of the changes discussed. It also reveals that divorce was in fact common before 1890, when German colonial rule was imposed. In the third and last part I seek to explain this marital instability in ‘pre-colonial’ Abutia.

scholarly journals Use of a mathematical model to estimate the impact of shrimp pen culture at Patos Lagoon estuary, Brazil

2014 ◽  
Vol 86 (3) ◽  
pp. 1063-1076 ◽  
Author(s):  
LUÍS H. POERSCH ◽  
ÂNGELA M. MILACH ◽  
RONALDO O. CAVALLI ◽  
WILSON JR. WASIELESKY ◽  
OSMAR MÖLLER ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Management Strategies ◽  
Water Current ◽  
Patos Lagoon ◽  
Water Current Velocity ◽  
Environmental Management Strategies ◽  
Farfantepenaeus Paulensis ◽  
Nitrogen Concentrations ◽  
Definition Of ◽  
The Impact

Ecological modeling has been used as a tool to estimate potential impacts caused by aquaculture to the surrounding environment. In this work, a mathematical model was applied to estimate the maximum amount of pink shrimp (Farfantepenaeus paulensis) culture units (3,100m2 pen enclosures) that could be installed at two shallow estuarine bays of Patos Lagoon (known as Coreia and Porto do Rei) with no significant effects on either water quality or viability of the culture system. To calibrate the model, information about the culture of Litopenaeus vannamei and F. paulensis as well as field data (influence of netting material, water current speed and nitrogen concentrations) were used. Under a bad scenario (water current velocity of 0.01m s–1 and a mesh clogging effect of 40%), it would be possible to install up to 29 pens at the Coreia bay, and 39 pens at the Porto do Rei bay. Results indicate that the model was useful in determining the maximum number of culture units that could be installed at these bays, and thus have the potential to become an important tool in the definition of environmental management strategies in relation to aquaculture development.

scholarly journals The effect of the use of the jurists for Alfasid and Albatil in the acts of worship on Juristic Issues

2019 ◽  
Vol 27 (4) ◽  
pp. 1-17
Author(s):  
Ali Mohammed Abdullah Al - Shankiti Ali Mohammed Abdullah Al - Shankiti
Keyword(s):  
The Other ◽  
Linguistic Meaning ◽  
Conventional Meaning ◽  
The Third ◽  
The Difference ◽  
Definition Of ◽  
The Impact

This research deals with the difference between for Alfasid and Albatil. The researcher compares and prefers what appeared to him after investigation and inference. This research aims to indicate the meaning of Alfasid and Albatil, and based on the definition of a difference between jurists and speakers. This research aims to edit the difference between Alfasid and Albatil in the acts of worship on the four doctrines. And the impact on the branches of jurisprudence. This research has an introduction and two chapters: Chapter I: In a statement of the meaning of Alfasid and Albatil: and under three topics: The first topic: the linguistic meaning. The second topic: the conventional meaning. The third topic: the difference between jurists and speakers in the definition of Alfasid and Albatil. Chapter 2: The difference between Alfasid and Albatil at the four schools of worship. The first topic is: Alfasid and Albatil in the Hanafi and its impact on the jurisprudential branches. The second topic: Alfasid and Albatil in the other schools and its impact on the branches of jurisprudence. The third topic: the impact of the difference between the Hanafi and the other schools in achieving the difference between Alfasid and Albatil in worship.

scholarly journals Operational Optimization of the Electromechanical System in Non-deterministic Conditions

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Technical Problem ◽  
Control Object ◽  
Electromechanical System ◽  
Operational Optimization ◽  
The Moment ◽  
Definition Of ◽  
The Impact ◽  
The Mathematical Model

On the basis of theoretical and practical studies of the electromechanical system, the scientific and technical problem of improving the control system of the electromechanical system during the impact on it of multi-vector perturbations is solved. The result of the study is the integration of differential equations with coefficients dependent on the oscillations of the control object. In the theoretical part, the mathematical model of the electromechanical system was synthesized, which made it possible to investigate ways of minimizing the deviation angles and time intervals required to stabilize the motion of the electromechanical system, which allowed indirectly to realize the associated signal with the stochastic nature of the moment of oscillation of the control object on the coordinate plane. The method of parametric optimization of the mathematical model of the electromechanical system in the function of the angle of inclination is also improved and investigated. Based on the definition of the structure and algorithms of work, the efficiency of the control system of the electromechanical system increases in terms of reducing the stabilization time of the control object.

scholarly journals Understanding and Consideration of the Concept of Happiness, what Impact in Economic Thinking?

K@iros ◽  
2015 ◽  
Author(s):  
Gil-Ian ROYANNEZ ◽  
Keyword(s):  
Efficiency Wage ◽  
The Third ◽  
Economic Significance ◽  
Current State ◽  
Individual Productivity ◽  
Wage Theory ◽  
The Subject ◽  
Definition Of ◽  
Economic Thinking ◽  
The Impact

The questions addressed are : what do we know, in the current state of knowledge, happiness, and its importance for human development, global and individual ? Can you outline a general approach ? How this approach is essential to determine our goals, social and individual ? To answer these questions the methodology of this article consists, firstly, to present the main empirical results on the subject. Many databases have emerged : the NBB, the World Database of Happiness, IBM, HDI and many others. Investigations have provided the opportunity to work on large amounts of data on the level of happiness felt by the population, and its causes. They complement, but lead ultimately to results often close. The second part analyzes the relevance and limitations of these investigations, in order to more precisely the emergence of a definition of happiness and its components. The purpose of the third part is to define the economic significance of these results. Indeed, many economic theories are based on a vision of happiness underlying, whatsoever for example in the calculation of individual productivity (efficiency wage theory), or in determining the choice (bounded rationality)… We conclude this work by a simple model of the impact of happiness in our choices.

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