At present peristaltic pumps are widely used in many branches of industry and national economy. Simplicity of construction, processability and possibility of pumping liquids with big quantity of solid particles are the main advantages while using peristaltic pumps. Therefore development of methods of rational choice of parameters at designing of peristaltic pumps is the actual problem. To develop universal mathematical models of dynamic processes in peristaltic pumps for definition of rational technical parameters. In dynamic processes we propose to use differential equations of motion in the Lagrange form, where the angle of rotation of the pump rotor is taken as a universal coordinate. Mathematical model of dynamic processes in peristaltic pump with hydraulic drive has been created on the base of differential equation. The function of resistance forces caused by gravity forces of mixture particles in the hose reel has been determined. On the basis of the non-linear model of the resistance forces to the flow of the fluid Bingham method of constructing the dependence of the pressure drop on the angular velocity of the rotor to determine the resistance forces to the flow of the fluid has been proposed. The result of dynamic processes simulation is the determination of interrelationship of technological parameters of the device functioning: the velocity of the medium and pump performance is increasing at reducing the length of the diverting hose and reducing the height of its rise; a significant influence on the average speed has plastic viscosity of the environment; a significant change in the yield strength has an insignificant impact on the speed.

The article is devoted to the study of methods and means that help to improve traction and traction characteristics of power vehicles, in particular tractors, when performing combined operations of soil treatment. The article analyzes the impact of weight distribution, tire pressure, and the use of special devices on the quality of tillage operations. It was established that the efficiency of combined tillage operations depends on the level of traction and traction characteristics of the power tool. To increase traction characteristics of the tractor, it is proposed to use mathematical methods of increasing tire pressure and optimal weight distribution on the axle. The article also describes special devices for increasing traction resistance, which help to provide better traction and increase traction characteristics. This article examines the influence of soil parameters on traction and traction characteristics of an energy vehicle during combined soil treatment operations. It was found that soil indicators, such as moisture, density and fractional composition, have a significant impact on the quality of soil processing operations and traction characteristics of the tractor. To solve this problem, methods of increasing traction and traction characteristics are proposed, such as a mathematical method of increasing tire pressure and a method of optimal weight distribution on the suspension. The use of special devices to increase traction resistance, which help to ensure better traction and improve traction characteristics, is also considered. The research conducted by the authors can be useful for tillage and tractor maintenance specialists who are engaged in optimizing the operation of energy equipment at agricultural enterprises.

The study of soils by immersion of a cone under the influence of ultrasonography is one of the express methods of obtaining engineering and geological information about the physical and mechanical properties of the foundation from loose soils of buildings and structures. It makes it possible to detect the degree of homogeneity of probed soils; determine the position of the boundaries (contacts) of various lithological layers and bearing layers for the fuel base; to identify and delineate in plan and in depth the weakened zones on the studied areas for the exact reference of the place of conducting experimental works; choose the optimal options for choosing hammers; evaluate the physical and mechanical properties of sandy soils (density, angle of internal friction, etc.); roughly estimate the modulus of deformation of sandy soils. The main tasks are the development, research and calculation of the main parameters of installations with a hydraulic impulse drive for soil probing. The object of research is the process of soil probing. The subject of the study is the hydropulse drive of the soil probing installation. Experience has shown that the effective use of field methods is possible only under the condition of a methodically correct approach to the preparation and execution of programs of the entire complex of search operations. Various aspects of the problem of comprehensive soil research using field methods were developed and deepened gradually.The main research methods include the analysis of information on existing methods and installations for spraying tungsten powders, mathematical modeling of processes in the spindle unit of the installation for spraying metal powders, taking into account its design features and operating modes based on nonlinear differential equations of heat transfer from solid and liquid bodies using numerical methods of their solution based on the FlowVision program.

It is known that when processing plastic materials by cutting, chip grinding is a serious problem. The formation of a stable, strong draining chip is a sign of low machinability of the material of the part and requires the use of special means and methods that would ensure the separation of the chip or allowance that is cut. This issue is especially relevant in the case of cutting drawing as a low-speed process, which is characterized by intensive overgrowth and a high coefficient of chip shrinkage, and therefore the strength of the latter. Today, there are a number of original developments of several scientific schools, which implement the idea of preliminary division of the allowance during drawing by creating a network of technological chip-splitting grooves. The process of internal drawing, in particular drawing of round deep holes, must necessarily take place under conditions of forced chip separation or allowance. At the same time, the so-called transverse division of the chips, i.e., division along the perimeter of the hole, is usually carried out due to structural elements on the broach teeth and today is not too difficult a problem. However, there are certain reserves in this direction as well, in particular those related to increasing the stability of the tool. This article considered the technological function of the reliefs, which consists in the forced division of the cut allowance with contour grooves. An analysis of the advantages and disadvantages of the most common processes for obtaining round holes in hollow blanks and parts is carried out. The essence of the group (progressive, variable) stretching scheme is described. Typical combined extension tools are considered. Given formulas for calculating the dimensions of chip grooves. The first component р of the change in the diameter of the hole and the outer diameter of the workpiece after each of the combined drawing operations is characterized.

As you know, one of the areas of development of modern agricultural machinery is to expand their functionality, increase capacity and productivity. The solution to this problem is possible through the use of powerful small-sized drives - namely hydraulic drives. These properties of the drive of this type have become crucial for its widespread use in agricultural machinery. Today, the hydraulic drive is used to drive the working bodies of machines, and as the drive of the main movement of self-propelled agricultural machines. The main hydraulic unit that drives a self-propelled agricultural machine is a hydrostatic transmission. Significant competition in the market of self-propelled agricultural machinery has led to an increase in the level of technical requirements for both agricultural machinery in general and hydrostatic transmissions operating in their composition. At the same time, further increase of energy saving and economic efficiency becomes especially important. The solution of the set tasks is greatly facilitated by further hydrofication of the drives and working bodies of agricultural machines. The most successful solution to this problem is the use of a hydrostatic drive, a typical representative of which are hydrostatic transmissions such as GST-90. The analysis of theoretical researches is carried out, the design of the stand for carrying out experimental researches for the purpose of confirmation of results of mathematical modeling is offered. Measuring and recording equipment for conducting a physical experiment is described. The coincidence of the results of experimental studies of hydrostatic transmissions with the results of computer simulation based on the developed mathematical model confirms its adequacy and correctness of the assumptions. Due to this, it is possible to recommend using the results of mathematical modeling in the design of new designs of hydrostatic transmissions.