scholarly journals Improving the Performance of Working Bodies and Tribosystems of Harvester Technological Equipment

2021 ◽  
pp. 135-149
Author(s):  
Evgeny A. Pamfilov ◽  
◽  
Vladimir V. Kapustin ◽  
Galina A. Pilyushina ◽  
Elena V. Sheveleva ◽  
...  
Keyword(s):  
Timber Harvesting ◽  
Operating Conditions ◽  
Thermal Mode ◽  
Technological Equipment ◽  
Functional Surface ◽  
Technological Parameters ◽  
Surface Layers ◽  
Wide Range ◽  
Functional Units ◽  
Working Bodies

Ensuring the competitiveness of enterprises of the forest complex is largely due to the level of reliable and high-performance equipment use, since this achieves a significant increase in the efficiency of timber harvesting and processing. At the same time, the required level of reliability of logging machines is largely determined by the performance of their functional units that carry out the basic technological operations. Accordingly, the development and implementation of ways and methods to improve the performance of functional units of machines is important when creating promising models of the specified equipment. This requires an analysis of the prospects and technical possibilities for improving the main mechanisms and units of logging machines and the factors limiting their performance. In order to improve the performance of machine functional units, it is essential to ensure the coordinated provision of favorable levels of a significant number of design and technological parameters. In particular, it is advisable to optimize the nature of the relative movement of the friction-contacting surfaces of the parts and reduce the loads acting on them. This is due to the fact that these factors determine the wear resistance and friction resistance, as well as the thermal mode of the machine operation, the stress state of the functional surface layers and the strength of the fixed joints. At the same time, the influence of operating conditions, the wear intensity and service life of the objects under study should be taken into account. This approach is due to the fact that tribotechnical units of logging machines perform their functions under the action of high shock, cyclic and vibration loads, in a wide range of harsh natural and climatic conditions characterized by low temperatures, high humidity, and the action of chemical and abrasive media. All this should be considered when justifying effective ways to improve the performance of functional units, including manipulators of logging machines, and achieved through regulated directional control of the properties of surface layers in the design and manufacture of friction-contacting parts. The paper substantiates the need to create scientific and engineering foundations for improving the performance of functional units and working bodies of machines, as well as achieving the required performance, durability and reliability. For this purpose, the tasks of further research aimed at obtaining information, the absence of which makes it impossible to create domestic import-substituting equipment, are clarified. For citation: Pamfilov E.A., Kapustin V.V., Pilyushina G.A., Sheveleva E.V. Improving the Performance of Working Bodies and Tribosystems of Harvester Technological Equipment. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 6, pp. 135–149. DOI: 10.37482/0536-1036-2021-6-135-149

Research on Combined Processing Technology of Superficial Layers Hardened Steel

2016 ◽  
Vol 841 ◽  
pp. 21-28
Author(s):  
Petrică Corabieru ◽  
Stefan Velicu ◽  
Anişoara Corabieru ◽  
Dan Dragos Vasilescu ◽  
Ionel Păunescu
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Cooling Rate ◽  
Hold Time ◽  
Hardened Steel ◽  
Operating Conditions ◽  
Technological Parameters ◽  
Surface Layers ◽  
Durability Analysis ◽  
Machined Parts

The novelty technology lies in the fact that the hardening of the surface layers is carried out both in liquid phase and in the solid state. Technology comprises three main stages with 12 technological phases.Experimentation highlights the viability of the technological procedure. The results of tests and verifications are the basis of the analysis of combined machined parts behavior in conditions similar to the operating conditions and of the analysis of the dependence between operation behavior and durability. Analysis of the results revealed the fact that failure to technological parameters: casting temperature; hold time at high temperatures; cooling rate after microalloying in liquid phase, gives rise to possible faults of the combined treated parts.

scholarly journals FERROMAGNETIC MATERIALS USE FOR PROVIDING THE NECESSARY THERMAL MODE OF PROCESSING EQUIPMENT (REVIEW)

2019 ◽  
pp. 60-72
Author(s):  
I.O. Mikulionok
Keyword(s):  
Phase Transition ◽  
Magnetic Material ◽  
Mass Transfer ◽  
Heat Exchangers ◽  
Thermal Mode ◽  
Technological Equipment ◽  
New Approach ◽  
Static Mixers ◽  
Extrusion Head ◽  
Working Bodies

A new approach to providing the necessary temperature of technological equipment of various industries, in particular, chemical, food, microbiological, heat and power, and therefore a stable thermal mode of processing the flows of substances and materials that are in the specified equipment is proposed. It has been proposed to make working bodies and elements of equipment in contact with the flows of the substances and materials being processed from magnetic material with a phase transition temperature of the second type (Curie point), which corresponds to the temperature of the technological process. The designs of tubular heat exchangers, dryers, packed and disc mass transfer columns, separators, equipment for the processing of thermoplastics (extrusion head, static mixers, worm extruder), as well as bulk feeder are considered. Bibl. 19, Fig. 15.

scholarly journals Program for determination of zones of gold concentration on sluices of washing devices

2021 ◽  
Vol 895 (1) ◽  
pp. 012002
Author(s):  
V S Alekseev ◽  
R S Seryi
Keyword(s):  
High Performance ◽  
Two Phase Flow ◽  
Experimental Studies ◽  
Operating Conditions ◽  
Phase Flow ◽  
Technological Parameters ◽  
Two Phase ◽  
Alluvial Gold ◽  
Wide Range ◽  
Host Rocks

Abstract Currently sluice washing devices are the most common in alluvial gold mining. Their use provides a sufficiently high performance, relatively low power consumption, and acceptable recovery of valuable components. The theoretical provisions of traditional hydraulics make it possible to determine all the main parameters of the movement of particles of rocks and gold in the pulp, however, in real operating conditions of the sluice box, their actual values will differ greatly from the calculated ones, especially if there are solid fractions in the pulp with a particle size of more than 20 mm. This is explained by significant fluctuations in the values of the surface, average and bottom velocities of the two-phase flow, vertical pulsation velocity in conditions of constrained movement of the different fractional composition of rocks. The article presents the results of experimental studies to identify the dependence of the distance traveled by an individual gold particle and host rocks in a two-phase flow through a sluice, the bottom of which is lined with trapping coatings, on the design and technological parameters of the flushing device. The mathematical model for determining this distance formed the basis of the Gold Enriching program. The program allows, in a wide range of initial data, to determine the zones of concentration of gold of a certain size at the sluice boxes.

scholarly journals The Application of Similarity Theory and Dimensional Analysis to the Study of Centrifugal-Rotary Chopper of Forage Grain

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4501
Author(s):  
Wacław Romaniuk ◽  
Petr Savinykh ◽  
Kinga Borek ◽  
Kamil Roman ◽  
Alexey Y. Isupov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Dimensional Analysis ◽  
Similarity Theory ◽  
Empirical Relationship ◽  
Vertical Axis ◽  
Similarity Criteria ◽  
Technological Parameters ◽  
Initial Stage ◽  
Wide Range ◽  
Working Bodies

This article presents the device and the principle of operation of forage grain crushers that use the centrifugal force of inertia to supply the working bodies—which occurs as a result of rotation of the rotor with a vertical axis. The results of some tests of machines working on this principle have been characterized. Attention is drawn to the disadvantages of most research works, namely the lack of premises for creating shredders of this class with a wide range of performance. The aim of this work is to establish the relationship between the design and technological parameters for the operation of a centrifugal-rotary shredder using the theory of similarity and a dimensional analysis. Moreover, the experimental data show an empirical relationship when calculating the efficiency for the shredder model considered above. By applying the similarity criteria, dimensionless complexes were obtained, which allow to determine the significance of the parameters selected at the initial stage for the efficiency of the shredder. The novelty of this research is the application of the theory of similarity and the use of dimensional analysis, which allowed for scaling the results of the experimental data and obtaining a centrifugal-rotary shredder with higher efficiency, while maintaining the quality of the obtained product. This technique indicates the energy costs of the grinding process, which can be used to select the ratio of parameters in the shredder that would ensure that a minimum amount of energy is consumed.

scholarly journals Modernization of the cooling system in tractors with gas engines

2020 ◽  
Vol 224 ◽  
pp. 04048
Author(s):  
N. A. Bolshakov ◽  
O N Didmanidze ◽  
E P Parlyuk
Keyword(s):  
Thermal Regime ◽  
Cooling System ◽  
Weight Ratio ◽  
Operating Conditions ◽  
Working Environment ◽  
New Production ◽  
Theoretical Terms ◽  
Cooling Systems ◽  
Wide Range ◽  
Functional Units

With an increase in the power/weight ratio of vehicles in cities and towns, the thermal loads of many functional units increase significantly. This requires the organization of the removal of excess heat into the environment, since the violation of the proper thermal regime in individual functional units prevents the realization of the potential operational properties of the entire vehicle up to failure. At the same time, the variety of operating conditions for vehicles, causing a change in a wide range of factors of the working environment, especially road and climatic ones, creates a difficult, both in practical and theoretical terms, problem of ensuring the required thermal regime for functional units. In this regard, the paper presents a consistent development of the theory of hydrothermodynamic properties of functional units based on the principles of constructing the operational properties of vehicles. The problems determining the further search and scientific substantiation of meters and indicators for assessing the efficiency of cooling systems, as well as the development of methods, tools and equipment for calculating and studying these systems are considered. At the same time, the work presents the improvement of the working process and designs of gas engines of tractors aimed at increasing reliability through the use of new production technologies. In conclusion, the definition of scientifically grounded methods and practical solutions for improving the performance of cooling systems is given, which has an important scientific and economic significance for increasing the operational properties of agricultural tractors, substantiating the current importance.

Comparison of Deterministic and Linear Cosine Spatial Filtering of Transmission Electron Micrographs

1972 ◽  
Vol 30 ◽  
pp. 596-597
Author(s):  
David A. Ansley
Keyword(s):  
Spherical Aberration ◽  
Focal Length ◽  
Chromatic Aberration ◽  
Spatial Filter ◽  
Operating Conditions ◽  
Objective Lens ◽  
List Type ◽  
Spatial Filters ◽  
Transmission Electron ◽  
Wide Range

The coherence of the electron flux of a transmission electron microscope (TEM) limits the direct application of deconvolution techniques which have been used successfully on unmanned spacecraft programs. The theory assumes noncoherent illumination. Deconvolution of a TEM micrograph will, therefore, in general produce spurious detail rather than improved resolution.A primary goal of our research is to study the performance of several types of linear spatial filters as a function of specimen contrast, phase, and coherence. We have, therefore, developed a one-dimensional analysis and plotting program to simulate a wide 'range of operating conditions of the TEM, including adjustment of the:(1) Specimen amplitude, phase, and separation(2) Illumination wavelength, half-angle, and tilt(3) Objective lens focal length and aperture width(4) Spherical aberration, defocus, and chromatic aberration focus shift(5) Detector gamma, additive, and multiplicative noise constants(6) Type of spatial filter: linear cosine, linear sine, or deterministic

IMPROVEMENT OF INNOVATIVE ACTIVITY OF THE ENTERPRISE

2017 ◽  
Author(s):  
Nataliya Stoyanets ◽  
◽  
Mathias Onuh Aboyi ◽  
Keyword(s):  
Value Chain ◽  
Net Present Value ◽  
Successful Implementation ◽  
Innovative Development ◽  
Technological Equipment ◽  
Alliance Partner ◽  
Innovation Potential ◽  
Wide Range ◽  
Technological Platform ◽  
The Cost

The article defines that for the successful implementation of an innovative project and the introduction of a new product into production it is necessary to use advanced technologies and modern software, which is an integral part of successful innovation by taking into account the life cycle of innovations. It is proposed to consider the general potential of the enterprise through its main components, namely: production and technological, scientific and technical, financial and economic, personnel and actual innovation potential. Base for the introduction of technological innovations LLC "ALLIANCE- PARTNER", which provides a wide range of support and consulting services, services in the employment market, tourism, insurance, translation and more. To form a model of innovative development of the enterprise, it is advisable to establish the following key aspects: the system of value creation through the model of cooperation with partners and suppliers; creating a value chain; technological platform; infrastructure, determine the cost of supply, the cost of activities for customers and for the enterprise as a whole. The system of factors of influence on formation of model of strategic innovative development of the enterprise is offered. The expediency of the cost of the complex of technological equipment, which is 6800.0 thousand UAH, is economically calculated. Given the fact that the company plans to receive funds under the program of socio-economic development of Sumy region, the evaluation of the effectiveness of the innovation project, the purchase of technological equipment, it is determined that the payback period of the project is 3 years 10 months. In terms of net present value (NPV), the project under study is profitable. The project profitability index (PI) meets the requirements for a positive decision on project implementation> 1.0. The internal rate of return of the project (IRR) also has a positive value of 22% because it exceeds the discount rate.

Structure and properties of compact articles from high-alloyed iron powder with adding of boron nitride

2020 ◽  
pp. 39-48
Author(s):  
B. O. Bolshakov ◽  
◽  
R. F. Galiakbarov ◽  
A. M. Smyslov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Grain Boundary ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Operating Conditions ◽  
Structure And Properties ◽  
Steam Turbines ◽  
Friction Forces ◽  
Wide Range

The results of the research of structure and properties of a composite compact from 13 Cr – 2 Мо and BN powders depending on the concentration of boron nitride are provided. It is shown that adding boron nitride in an amount of more than 2% by weight of the charge mixture leads to the formation of extended grain boundary porosity and finely dispersed BN layers in the structure, which provides a high level of wearing properties of the material. The effect of boron nitride concentration on physical and mechanical properties is determined. It was found that the introduction of a small amount of BN (up to 2 % by weight) into the compacts leads to an increase in plasticity, bending strength, and toughness by reducing the friction forces between the metal powder particles during pressing and a more complete grain boundary diffusion process during sintering. The formation of a regulated structure-phase composition of powder compacts of 13 Cr – 2 Mо – BN when the content of boron nitride changes in them allows us to provide the specified physical and mechanical properties in a wide range. The obtained results of studies of the physical and mechanical characteristics of the developed material allow us to reasonably choose the necessary composition of the powder compact for sealing structures of the flow part of steam turbines, depending on their operating conditions.

Nitrogen Removal from Anaerobically-Treated Leachate

1984 ◽  
Vol 19 (1) ◽  
pp. 87-100
Author(s):  
D. Prasad ◽  
J.G. Henry ◽  
P. Elefsiniotis
Keyword(s):  
Nitrogen Removal ◽  
Air Flow ◽  
Operating Conditions ◽  
Air Flow Rate ◽  
Flow Rates ◽  
Anaerobic Filter ◽  
Ph Values ◽  
Wide Range ◽  
Ammonia Desorption ◽  
Effects Of Ph

Abstract Laboratory studies were conducted to demonstrate the effectiveness of diffused aeration for the removal of ammonia from the effluent of an anaerobic filter treating leachate. The effects of pH, temperature and air flow on the process were studied. The coefficient of desorption of ammonia, KD for the anaerobic filter effluent (TKN 75 mg/L with NH3-N 88%) was determined at pH values of 9, 10 and 11, temperatures of 10, 15, 20, 30 and 35°C, and air flow rates of 50, 120, and 190 cm3/sec/L. Results indicated that nitrogen removal from the effluent of anaerobic filters by ammonia desorption was feasible. Removals exceeding 90% were obtained with 8 hours aeration at pH of 10, a temperature of 20°C, and an air flow rate of 190 cm3/sec/L. Ammonia desorption coefficients, KD, determined at other temperatures and air flow rates can be used to predict ammonia removals under a wide range of operating conditions.

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