• MECHANIZATION IN AGRICULTURE

    THE STUDY OF MOVEMENT WIDE SPAN TRACTOR (VEHICLES) WITH KINEMATIC (TURN OF WHEELS) METHOD OF ITS CONTROL

    Mechanization in agriculture & Conserving of the resources, Vol. 63 (2017), Issue 5, pg(s) 188-192

    Prospective energy technology devises for controlled traffic farming is the wide span tractor (vehicles). Their driving can be built behind the kinematic or force principle of the turn. At the kinematic turn, the schemes are applied by turning the steered wheels (front, rear or both front and rear) relative to the car’s frame. The widest distribution in wide span tractor (vehicles) was obtained by turning schemes with all steerable wheels. The theoretical foundations of the dynamics of the parallel-span parallel motion tractor (vehicles) in the horizontal plane are presented in the article under the kinematic method of its control (by turning the wheels). Theoretical research is based on the basic principles of theoretical mechanics, tractor theory, statistical dynamics and the theory of automatic control of linear dynamical systems when they reproduce statistically random control and disturbing input effects. The amplitude and phase frequency characteristics are based on the analysis of the evaluation of the degree of influence of the circuit and parameters of the investigated wide span tractor (vehicles) on its controllability and stability of motion. The physical object of the theortical studies was the prototype of the wide span tractor (vehicles) of the new design. Mathematical models of the wide span tractor (vehicles) movement are represented in the differential and operator form of recording. On the basis of mathematical models, the calculated amplitude and phase-frequency characteristics of the dynamic control system development are plotted, represented by the average rotation angle of the front wheels of the wide span tractor (vehicles). The constructed mathematical models, amplitude and phase-frequency characteristics allow estimating the effect of the control parameter of the wide span tractor (vehicles), as well as its design and other parameters on the controllability and stability of motion.

  • CONSERVING OF THE RESOURCES

    ON THE ISSUE OF REDUCING THE HARMFUL INFLUENCE OF THE MOBILE AGRICULTURAL SYSTEMS UNITS ON THE SOIL

    Mechanization in agriculture & Conserving of the resources, Vol. 63 (2017), Issue 3, pg(s) 119-121

    The article is devoted to the problem of increasing the efficiency of using mobile agricultural aggregates by reducing the impact of their running systems on the soil. The work on the efficiency of the use of mobile agricultural units based on the automobile chassis in agroindustrial production is analyzed, which shows the results of studies on the changes in their designs with the purpose of reducing the harmful influence of chassis running systems on soil. One of the ways to reduce the harmful influence of running systems of mobile agricultural units on Execution of technological operations, both in field conditions and in transport operations while driving along the road Mobile roads. The main ways that will ensure the effective use of the automobile chassis in field conditions and on highways are analyzed. It has been found that the most effective is the equipment of automobile chassis with wide – profile tires with adjustable internal air pressure and a tire – pumping control system, which makes it possible to effectively use the chassis both in the main technological operations (in the field) and in transport operations (on the roads). The influence of the air pressure in the tire of the wheel of the running system of the KrAZ – 6322 automobile chassis and the normal load on the contact area of the tire with the supporting surface and pressure on it is established. To use the automobile chassis for performing agricultural operations in field conditions, it is necessary to equip it with wide – profile tires with adjustable internal air pressure and a tire – pumping monitoring system that will reduce the negative impact on the soil of the mobile agricultural unit and expand the list of technological operations on which it can be used.

  • MECHANIZATION IN AGRICULTURE

    THEORETICAL STUDY TO DETERMINE THE STANDARD SIZE RANGE OF AGRICULTURAL TRACTORS

    Mechanization in agriculture & Conserving of the resources, Vol. 63 (2017), Issue 3, pg(s) 92-94

    Since the tractor is the main energy source in agriculture, the state with highly developed agrarian production, tractor and agricultural machine building should have a fairly clear and consistent policy in the field of organizing the production and supply to agricultural producers of a wide range of tractors for various purposes. Such a policy is based on the type of mobile energy resources, i.e. tractors, based on a deep analysis and study of the volume of agricultural production, the needs for mechanized technologies, the theory of the operation of agricultural machines, the overall assessment of the development of high-tech agriculture. The purpose of this study is to develop theoretical bases for calculating the type of agricultural tractors based on an optimization of technical and economic analysis, taking into account the need for a qualitative and timely implementation of the entire closed set of works in agricultural production. During the research methods of machine use in agriculture, higher mathematics, economics, compilation of programs and numerical calculations on PC were used. The results of the study showed that the classification of tractors should be carried out not according to traction power (as is done in most countries of the world), but by the nominal traction force developed by them. It has been established that this gives a more accurate representation of the operational properties of an energy tool, which in turn allows for the very accurate and correct selection of complexes of appropriate agricultural machinery and implements for its effective operation. The presented theoretical approaches allow to determine with a high degree of accuracy the type of agricultural tractors for any country.

  • PROBLEMS RELATED TO MAINTENANCE OF AGRICULTURAL EQUIPMENT IN BULGARIA

    Mechanization in agriculture & Conserving of the resources, Vol. 61 (2015), Issue 12, pg(s) 25-27

    Maintenance of agricultural equipment is carried out by agricultural equipment dealer in Bulgaria. Their business interests forbid them to implement strategies that decrease maintenance costs, such as proactive maintenance or condition based maintenance. For this reason farmers incur unnecessary financial losses. This article shows the necessity and effectiveness of implementing early diagnosis in agricultural equipment maintenance.

  • Надеждност. Сервизна техника

    CRITERIA FOR EVALUATION OF SUITABILITY AND EXPEDIENCY OF THE INCLUSION UNITS AND ASSEMBLIES IN EXCHANGE FUND

    Mechanization in agriculture & Conserving of the resources, Vol. 59 (2013), Issue 1, pg(s) 21-24

    The effective use of tractors and self-propelled agricultural machines largely depends on the repair service. The aggregate repair methods are best suited to the condition of the machine-tractor fleet at the moment and capabilities of repair and service facilities. For its implementation it is necessary to create exchange fund of units and assemblies.

    In the paper are systematized the evaluation criteria of suitability and feasibility of including units and assemblies for exchange fund for aggregate method of repair. Certain aggregates and units of C-100MAX tractors were determined to be included in the exchange fund needed to maintain their efficiency.