Investigation of the uniformity of seed distribution during sowing of winter wheat

Abstract

One of the main indicators of high-quality sowing of seeds of agricultural crops is their uniform distribution along the length, because the main influence is exerted by the sowing apparatus. In the proposed work, the sowing of seeds of grain crops using a coil seeding machine is considered as an object of research. As a subject of research, the dependences of the uniformity of the distribution of seeds along the length of the furrow on the unevenness of the specific working volume of the coil, the rotation frequency of the blower of the pneumatic seeder and the seeding rate are considered. The aim of the work is to improve the uniformity of the distribution of the area of nutrition that falls on each plant with an ordinary method of sowing winter wheat. The paper presents the results of theoretical prerequisites for determining the working volume of the seeding coil, the results of field experiments of the seeding apparatus using coils with different geometric characteristics. The analysis of the uniformity of seed distribution using regression analysis and Bayesian networks is carried out. The resulting determination coefficient of 0.82 allows us to conclude that the resulting mathematical model can be used for practical purposes. It is noted that the proposed cellular-honeycomb seeding coil stands out qualitatively among the grooved and grooved-screw.

Analysis of non-spool throttle flow dividers for synchronous hydromechanical drives

“…This setting, in turn, depends on the flow rate of the liquid at the inlet to the divider and on the elastic properties of the shell itself. The flow divider [18][19][20] is a non-interlocked throttle flow divider, the spring setpoint here is the elastic shell itself, which requires its manufacture with strictly defined elastic properties. This divider also involves the restructuring of sensitive elements when the flow rate changes through it.…”

“…Figure 6 shows a flow divider, in which the sensing element is made not in the form of permanent chokes, but in the form of variable resistances of the flat valve type, which makes it possible to compensate for the effect of an adjustable pressure drop on the shut-off and control element, which significantly improves operation in static mode, but leads to complication of its manufacture, since it requires the use of membrane elements with strictly specified elastic properties. Another way to exclude the influence of an adjustable pressure drop on the executive control element is used in the design of the flow divider [20][21][22] shown in Figure 7. Here, unlike the flow divider shown in Figure 4, the membrane element does not have a rigid center, and the outlet openings are made in the form of narrow slits.…”

Simulation of a synchronous hydrodynamic system based on a throttle flow divider of a non-valve type

“…The dynamics of the synchronous hydraulic system based on the DDP, the design scheme of which is shown in Figure 1, can be described by a number of differential equations [16][17][18][19].…”

Simulation of the testing process of reciprocating hydraulic cylinders with energy recovery

“…To study the obtained mathematical model, a special program was compiled using the SimInTech differential equation solution unit [17][18][19][20][21][22].…”