Research of operation safety and maneuverability of agricultural low-tonnage road train under critical traffic conditions

2020 ◽  
pp. 28-37
Author(s):  
Zakhid A. Godzhayev ◽  
Teymur Z. Godzhayev ◽  
Vladimir A. Korolyash ◽  
Ol’ga Yu. Solov’yeva
Keyword(s):  
Load Capacity ◽  
Research Purpose ◽  
State Technical ◽  
Safe Operation ◽  
Mechanical Coupling ◽  
Emergency Braking ◽  
Traffic Conditions ◽  
Critical Traffic ◽  
Difficult Road ◽  
Agricultural Machines

The article considers conditions for safe operation of low-tonnage road trains with overall trailers, namely universal platforms with a load capacity of up to 3 tons, capable of transporting agricultural machines, mini-factories and other equipment, as well as tourist houses. Transportation of such trailers on wheels is associated with high risks arising at small turning radii and emergency braking. (Research purpose) The research purpose is in improving the safety of operation and maneuverability of agricultural low-tonnage road trains operating in difficult road and terrain conditions of agricultural production. (Materials and methods) Authors have analyzed the results of research and experiments on the safe operation of low-tonnage road trains with trailers weighing up to 1 ton. The authors developed and tested on the basis of VIM and the Volga State Technical University a mechanical coupling device with a flexible connection that increases the handling and maneuverability of the trailer. (Results and discussion) The authors determined that the critical turning radii depending on the speed of a low-tonnage road train in different road conditions and different loading of the trailer when driving in front and rear for a conventional single-axle trailer with a load capacity of 1.5; 2; 2.5; 3 tons. It was found that the maneuverability is largely provided by the additional force in the cable, so authors recommend using a cable with a diameter of at least 9 mm. (Conclusion) Further research will make it possible to determine the critical indicators of safe operation of a low-tonnage road train with a load capacity of up to 3.5 tons: safe speed when passing critical turns, emergency braking and reversing.

Strategies of maintenance and repair of agricultural machinery

2020 ◽  
pp. 38-48
Author(s):  
Aleksey S. Dorokhov ◽  
Aleksandr V. Denisov ◽  
Aleksey A. Solomashkin ◽  
Valeriy S. Gerasimov
Keyword(s):  
Wear Rate ◽  
Technical Condition ◽  
Research Purpose ◽  
Agricultural Machinery ◽  
Maintenance And Repair ◽  
Wear Rates ◽  
Urgent Task ◽  
Machine Parts ◽  
Current Value ◽  
Agricultural Machines

Modern machines are subject to progressive wear that occurs at different rates, which leads to unpredictable failures that reduce the reliability and durability of machines. The strategy of maintenance and repair is aimed at eliminating these problems. (Research purpose) The research purpose is in analyzing the basic principles of the strategy of maintenance and repair of agricultural machinery in order to ensure control of the technical condition of machine parts. (Materials and methods) When resource diagnostics is used, , the allowable value of the parameter is set in advance for a part . This value is the tolerance that corresponds to a certain wear rate of the part. The tolerance is set based on the condition that if the current value of the controlled resource parameter during the next diagnosis is less than the set value, then such a part at the current value of the wear rate can be finalized until the next inter-control check. Taking into account the wear rate of the same type of parts from the group when determining the allowable wear during their resource diagnostics becomes an urgent task. (Results and discussions) As a result of research, the article presents "Methodology for determining the main indicators of reliability of parts of agricultural machines with different wear rates" and "Methodology for determining the tolerance system of parts of agricultural machines with different wear rates". (Conclusions) The article presents the tolerance system that reduces the probability of failure of machine parts in operation. During resource diagnostics, those parts whose resource parameters exceed the tolerance are rejected.

Assessing the Impact of a Cooperative Merging System on Highway Traffic Using a Microscopic Flow Simulator

2014 ◽  
Author(s):  
Ioannis A. Ntousakis ◽  
Kallirroi Porfyri ◽  
Ioannis K. Nikolos ◽  
Markos Papageorgiou
Keyword(s):  
Road Traffic ◽  
Highway Traffic ◽  
Cruise Control ◽  
V2v Communication ◽  
Traffic Conditions ◽  
Cooperative Adaptive Cruise Control ◽  
Low Efficiency ◽  
Critical Traffic ◽  
Vehicle Technologies ◽  
The Impact

Vehicle merging on highways has always been an important aspect, which directly affects the capacity of the highway. Under critical traffic conditions, the merging of main road traffic and on-ramp traffic is known to trigger speed breakdown and congestion. Additionally, merging is one of the most stressful tasks for the driver, since it requires a synchronized set of observations and actions. Consequently, drivers often perform merging maneuvers with low efficiency. Emerging vehicle technologies, such as cooperative adaptive cruise control and/or merging-assistance systems, are expected to enable the so-called “cooperative merging”. The purpose of this work is to propose a cooperative merging system and evaluate its performance and its impact on highway capacity. The modeling and simulation of the proposed methodology is performed within the framework of a microscopic traffic simulator. The proposed model allows for the vehicle-to-infrastructure (V2I) and vehicle-to-vehicle (V2V) communication, which enables the effective handling of the available gaps between vehicles. Different cases are examined through simulations, in order to assess the impact of the system on traffic flow, under various traffic conditions. Useful conclusions are derived from the simulation results, which can form the basis for more complex merging algorithms and/or strategies that adapt to traffic conditions.

Operation efficiency of knitters knives of domestic and import production used in agricultural machines

2020 ◽  
pp. 149-154
Author(s):  
Valeriy I. Ivanov ◽  
Vyacheslav F. Aulov ◽  
Yuriy N. Rozhkov
Keyword(s):  
Labor Productivity ◽  
Feasibility Study ◽  
Economic Effect ◽  
Import Substitution ◽  
Research Purpose ◽  
The Internet ◽  
Energy Costs ◽  
Operation Efficiency ◽  
Working Bodies ◽  
Agricultural Machines

Utilization of various stalks of grain crops (wheat, soy and rapeseed) is made by their grinding, usually in the field. The crushed straw is scattered across the field, and the spreading width is adjusted depending on the width of the reaper cutting devices. (Research purpose) The research purpose is in analyzing the existing market of knives for agricultural machines; goods of enterprises producing the knives, harvesters, using knives, types of knives, part numbers, specifications of knives in size and durability and to produce a feasibility study of using hardening knives. (Materials and methods) Authors used a digital method of searching through the Internet for enterprises that produce knives; combines that use knives; types of knives and their characteristics. (Results and discussion) It was found that due to intensive wear, the geometry of the cutting part and the overall dimensions of the working bodies of harvesting machines change, which causes violations of agricultural requirements, increased losses during crop harvesting, and increased energy costs. It was found that the efficiency of an agricultural machine directly depends on the state of its working parts, since they are limiting in terms of durability. The article notes that replacement of worn elements is accompanied by more labor, which reduces labor productivity, unnecessary equipment downtime and ultimately reduce profits of the enterprise. These factors indicate the need for technological measures to increase the resource of working parts of cutting devices of agricultural machines. (Conclusions) The article presents the results of the analysis of the market of existing enterprises for the production of knives. It gaves a feasibility to study of the effectiveness of strengthening knives using the technology of the Federal scientific Agroengineering center VIM. Production of hardened knives gives a good economic effect on import substitution.

Technology for restoring virgin and fallow lands

2020 ◽  
pp. 111-121
Author(s):  
Anastasiya V. Mironova ◽  
Igor’ V. Liskin ◽  
Andrey I. Panov
Keyword(s):  
Point Of View ◽  
Research Purpose ◽  
Labor Costs ◽  
Heavy Clay ◽  
Fallow Soil ◽  
Fallow Lands ◽  
Working Bodies ◽  
The Cost ◽  
Soil Recovery ◽  
Agricultural Machines

The soils that are subject to restoration include virgin and fallow lands, neglected pastures, soils overgrown with shrubs and young trees, swampy, with admixtures of hummocks and debris. The article shows the shortest period of restoration of virgin and fallow lands. (Research purpose) The research purpose is in comparative analysis of the need for equipment, economic and labor costs for the restoration of fallow lands using traditional and proposed by VIM technologies. (Materials and methods) Authors determined the indicators that characterize the properties of the soil for its restoration. It has been taken into account that for the treatment of this fallow soil, it is preferable to use combined aggregates or equipment with replaceable working bodies. Authors have compiled a set of aggregates for the proposed by VIM technology for soil recovery. The article shows the most productive and economically viable technology. The calculations of the cost of the necessary units, fuel and lubricants consumption, and labor costs are presented. (Results and discussion) It was determined that the restoration of fallow lands using the technology proposed by VIM reduces the cost of using the machine and tractor fleet by 35 percent by reducing the number of agricultural machines, fuel and lubricants by 17 percent, and the labor costs by 12 percent. The article shows that the efficiency of implementing the technology proposed by VIM for restoring virgin and fallow lands without shrubs and trees can reach 28 percent or more. (Conclusions) From the point of view of ecology, resource and energy saving, the most preferable are soil-processing combined units or agricultural machinery with changing working bodies (including those that perform various tasks). When restoring a 200-hectare section of fallow land with a heavy clay mechanical composition on soils that have not been treated for four consecutive years, according to the proposed VIM technology, the cost of restoration decreased by an average of 28 percent.

FEATURES OF TESTING SPRAYERS OF AGRICULTURAL MACHINES

2020 ◽  
Vol 4 (141) ◽  
pp. 47-53
Author(s):  
ROMAN POTEMKIN ◽  
◽  
ALEKSEY SVIRIDOV
Keyword(s):  
Plant Protection ◽  
Discharge Rate ◽  
Plant Protection Products ◽  
Test Methods ◽  
Research Purpose ◽  
Mineral Fertilizers ◽  
Pump System ◽  
Initial Stage ◽  
Modern Application ◽  
Agricultural Machines

Modern application of chemical plant protection products and liquid mineral fertilizers requires a comprehensive approach in compliance with all agricultural standards. Under-watering or overdosing of the introduced fertilizers can adversely affect the yield. Sprayers used on agricultural machines must be carefully selected and tested. (Research purpose) The research purpose is in analyzing the features of testing sprayers used on agricultural machines. (Materials and methods) The article presents reviewed data on the use of various methods of sprayer testing. Authors studied open sources as research materials and conducted a comparative analysis of the information. (Results and discussion) The article describes successive stages and test methods. The initial stage of testing sprayers is to determine the size (diameter) of drops at a certain pressure (1.5-3 bar) of the pump system. The liquid demolition directly depends on the size of the drop. Authors used the method of distribution of the solution into measuring cups on specialized test benches to determine the discharge rate. The article presents an example of the resulting table for testing sprayers.

Thermal Stress Analysis of Water-Cooling Brake Disc Based on 3D Thermo-Mechanical Coupling Model

2011 ◽  
Vol 314-316 ◽  
pp. 1581-1586 ◽  
Author(s):  
Wen Xian Tang ◽  
Yun Di Cai ◽  
Cheng Cheng ◽  
Qiu Yun Huang
Keyword(s):  
Thermal Stress ◽  
Stress Field ◽  
Circumferential Stress ◽  
Brake Disc ◽  
Water Cooling ◽  
Mechanical Coupling ◽  
Emergency Braking ◽  
Disc Surface ◽  
Thermal Stress Field ◽  
Fully Coupled

As the key part of offshore drilling drawworks brake system, the brake disc plays a vital role in guaranteeing the working reliability and operational security of the drawworks. To obtain the distributions and variations of thermal stress field in the water-cooling bake disc in an emergency braking, the 3D thermo-mechanical coupling theoretical model and FEM were established in this paper. Meanwhile the displacement and thermal boundary conditions for solution were determined, and then fully coupled analysis of thermal stress field in the disc was carried out by using ABAQUS software. The analysis results showed that, temperature field and stress field in the process of emergency braking were fully coupled. The temperature, radial stress and circumferential stress on the disc surface were presented as a hackle. The circumferential stress was significantly greater than the radial stress. Thermal stress has a periodic effect on the brake disc during braking, so the circumferential stress is the main factor that accounts for the initiation and propagation of crack on the brake disc surface.

An Assessment of Subway Station Capacity

2011 ◽  
Vol 291-294 ◽  
pp. 3212-3215
Author(s):  
Xin Yue Xu ◽  
Jun Liu ◽  
Hai Ying Li ◽  
Lu Min Zhao
Keyword(s):  
Subway Station ◽  
Capacity Assessment ◽  
Research Results ◽  
Emergency Situations ◽  
Traffic Conditions ◽  
Key Issues ◽  
Critical Traffic ◽  
Serious Injuries ◽  
European Statistics

Each year, according to Chinese and European statistics, there are many serious injuries and even fatalities of travelers into subway transit stations. Consequently, it becomes more and more important for transit authorities to evaluate these facilities (platform, gates, stairs, escalators, etc.) under critical traffic conditions, such as rush hours or emergency situations. The purpose of this paper is to review existing research results, develop the main Framework of station capacity assessment and finally point out the key issues of subway station capacity assessment.

AGROENGINEERING SCIENCE IN THE USSR IN 1920-1941

2021 ◽  
Vol 1 (142) ◽  
pp. 178-192
Author(s):  
Yuliya S. Tsench ◽  
Keyword(s):  
Automobile Industry ◽  
Scientific Work ◽  
Research Literature ◽  
Agricultural Science ◽  
Research Purpose ◽  
Engineering Science ◽  
Engineering Research ◽  
Agricultural Engineering ◽  
Research Institutes ◽  
Agricultural Machines

In tsarist Russia, there was no single organizational structure for agricultural science. The Scientific Committee of the Ministry of Agriculture, funding individual researchers, stations, as well as higher educational institutions where scientific research was conducted, led the scientific work. (Research purpose) The research purpose is in studying the stages of development of agricultural engineering science in the USSR in the period 1920-1941. (Materials and methods) Studied archival materials and research literature on this topic. The article shows the need to create an All-Russian Institute of Agriculture. The Scientific and Automotive Laboratory was organized, which later became the base for research institutes – the Scientific Automotive Institute, later renamed the Research Automotive and Tractor Institute, working in the field of automotive industry, tractor construction, automotive engines, technology and organization of automobile and tractor production. The article formulates the most important tasks of the formation of agroengineering science at the initial stage. (Results and discussion) In 1920-1941, specialized agricultural engineering research and training institutes were established, which took an active part in the formation of the Soviet tractor and automobile industry and the training of qualified personnel. The most important thing for the development of agricultural science was the formation of the All-Union Academy of Agricultural Sciences named after V. I. Lenin by the decree of the Council of People's Commissars of May 25, 1929. (Conclusions) In the pre-war period, a strong foundation of agricultural engineering science was laid. The first laws and regulations on the mechanization of agriculture and agricultural engineering were adopted. The first research institutes in the field of agricultural mechanization and agricultural engineering were organized. The first domestic tractors, grain harvesters and the most important agricultural machines were developed and put into production. The foundations of the theory were formed, the first fundamental scientific works and textbooks on agricultural machines, the processes of mechanization and electrification of agriculture were published.

INCREASING THE RELIABILITY OF HYDRAULIC DRIVE PARTS OF AGRICULTURAL MACHINES

2021 ◽  
Vol 3 (144) ◽  
pp. 49-55
Author(s):  
Aleksey A. Solomashkin ◽  
◽  
Azamat F. Il’mukhametov
Keyword(s):  
Wear Rate ◽  
Hydraulic Drive ◽  
Technical Condition ◽  
Research Purpose ◽  
Agricultural Machinery ◽  
Maintenance Strategies ◽  
Machine Parts ◽  
Current Value ◽  
Specific Part ◽  
Agricultural Machines

The article identifies the existing types of troubleshooting of self- propelled agricultural machinery. Taking into account the wear rate of the same type of parts from the group of parts of the same name when determining the permissible wear during their resource diagnostics is an urgent problem. The article presents the resource parameter and its influence on the reliability indicators of machine parts. (Research purpose) The research purpose is in determining the basic principles of the strategy of maintenance and repair of agricultural machinery in order to ensure control of the technical condition of machine parts, in particular, to increase the reliability of hydraulic drive parts. (Materials and methods) The article presents the options for maintenance strategies, the disadvantages and advantages of each of them. (Results and discussion) The article presents standard maintenance strategies: according to the need, planned preventive, according to the condition and justifies the optimal type of maintenance, taking into account the wear rate of each specific part. Authors performed an analysis of the algorithm for carrying out maintenance in each case individually. The tolerance is set based on the condition: if the current value of the controlled resource parameter during the next diagnosis turns out to be less than the set value, then such a part at the current value of the wear rate will be able to refine it until the next inter-control check. (Conclusions) The choice of a maintenance strategy has an important role in increasing the reliability of hydraulic drive parts of agricultural machines. A strategy has been developed that takes into account the wear rate of each specific part and the culling is carried out taking into account the wear rate of each part individually. Parts with a high wear rate are rejected first, and parts with a low wear rate are the last.

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