Analysis of Cottonseed Separation Process on a Unified Working Machine

Numerous studies have proved the high efficiency of using electric methods for separating seeds of agricultural crops during their cleaning and separation, when studying the different quality of seeds and pre-sowing treatment. The article presents the results of research on the separation of seeds on a cylindrical working organ. A mathematical model of the seed separation process is presented.

Development of a 100-Watt-Scale Beta-Type Low Temperature Difference Stirling Engine Prototype

This paper documents the ongoing design process of a Stirling engine prototype for a source temperature of 95 °C, aiming to achieve shaft power on the order of 100 Watts. The engine will serve to produce experimental data for the validation of a numerical low temperature Stirling model. The higher-level motivation is to assess the technical and economical potential of producing power from abundant sources of low temperature heat by using Stirling engines. Design decisions are governed by the goals of minimizing energy losses and maximizing the variability of operating points through variable heat exchanger geometry, compression ratio and charge pressure. The resulting design is a beta engine with a total gas volume around 100 liters. It features displacer and power pistons in a combined cylindrical working space and a mechanism using pivoting links similar to a bellcrank. The stroke of the power piston is adjustable while maintaining a constant top dead center position. A component critical for friction is the power piston seal, for which a low friction rolling seal and a conventional sliding seal were considered. As of June 2021, the development is at an advanced state and the first set of components are entering production.

Identification of the parameters of transport through porous media with clogging

The article is devoted to the determination of the parameters of impurity transport in a porous medium, the hydrodynamic resistance of which changes due to the settling of impurity particles on the pore walls (blockages). In most cases, experimental measurement of the parameters of such transport is not possible. When finding such parameters for the transport model under study, the inverse problem can be solved. The inverse problem is solved, for a certain set of experimental data, which can be correlated with the results obtained in modeling, using the BFGS method in combination with the adjoint function method. This paper simulates the pumping of a fixed volume of impurities through a working area filled with a porous medium at a constant pressure drop at its ends. As an "experimental" data set, the flow rate and concentration of impurities at the exit from the working area, obtained for the investigated model with the given parameters, are taken. The main approach for describing such transport is the MIM (mobile / immobile media) approach, which consists in dividing the total concentration of an impurity into a concentration of mobile and nonmobile. For small impurity concentrations, a nonlinear MIM model can be applied, the kinetic equation of which contains the saturation concentration of the immobile component, upon reaching which the adsorption of particles stops. Blockage in the model is taken into account by a change in the permeability of a porous medium due to a change in its porosity, which in turn decreases linearly with an increase in the concentration of the immobile component. For the model under consideration, the inverse problem of finding a given set of parameters was solved. The results of the test operation of the algorithm for solving the inverse problem are presented. It is shown that the algorithm converges to the specified parameters in a small number of iterations. It is assumed that this algorithm will be used to process the experimental data with a cylindrical working area filled with glass granulate as a porous medium.

Methods of calculation of the power for dough kneading with the use of blade-free working part

Baking industry plays one of the most important roles in the production of vital food products. The quality of the bakery products can be improved through the improvement of quality in technological process of dough kneading. A technical solution for providing greater contact with the environment, reducing the duration of the process, and, accordingly, increase productivity due to the developed design of a new machine with a cylindrical working body was proposed. The ways of regulating the course of the technological process in the working chamber of a new kneading machine are considered. They are based on the change of parameters: duration of kneading, temperature, humidity, rotation frequency of the working body. A method of calculating the required power based on the process of kneading the dough is proposed. It allowed obtaining a theoretical calculation of power consumption at unknown values of the friction forces action on the kneading drum, but the known frequency of its rotation with the corresponding design parameters and factors of influence. In addition, it makes possibility to determine the effort main components that affect to the power increase of the working body drive.

A flexible enzyme-electrode sensor with cylindrical working electrode modified with a 3D nanostructure for implantable continuous glucose monitoring

A novel flexible enzyme-electrode sensor was fabricated with a big cylindrical working electrode which, cooperating with the surface-modified 3D nanostructure, significantly improved the sensitivity.

INFLUENCE OF EDM WORN SURFACE OF THE WORKING PART OF STEEL BORON TOOTH TO RESTORE ITS CUTTING ABILITY

The article is devoted to the experimental evaluation of the efficacy of electrical discharge machining (modification) worn cylindrical working surface of the steel of boron in order to restore its cutting ability. It provides basic informationabout steel dental forests, including their structure and the main stages of production. It is noted that for such resource hog maximum computing time is about 9 minutes and then further worn drills are used and recycled. Based on an analysis of previous studies on the use of EDM surface modification of the wire, tape and disk recovery tools grounded prospect worn cutting ability of the working surface of the steel by its boron EDM with a view to its use in dental practice as well as in the production of dental products. Provides basic information about how to conduct experimental studies, including a description of the device for modifying the EDM worn working surface boron, as well as the device to determine its cutting ability on the intensity of cutting them a sample of the PCB. It was established experimentally that the resulting EDM modifying worn working surface boron therein forming wells having on the edges of the metal beading beyond the original contour of the surface, the height of which increases as the process of modifying U voltages on the storage capacitor, which leads to an increase in surface finish diameter boron. It has been shown that these spatter justified regarded as a kind of cutting elements (teeth) on the modified surface of the boron, giving it a worn surface of the cutting ability. It was established experimentally that the spark erosion boron worn surface modification can restore its cutting performance with respect to the original when U = 75 to 33.3%, and when U = 120 V - 43%, indicating a relatively high recovery efficiency of the proposed method of cutting the ability of the worn surface of steel dental burs.

Omni-Directional Gait of Multi-Legged Robot on Rough Terrain by Following the Virtual Plane

This paper proposes a simple gait algorithm for multilegged robots on slopes or rough terrain. This algorithm enables a robot follow a virtual plane defined by grounding points of the legs. The robot does not recognize the surrounding rough terrain. This proposed algorithm has been applied to an actual robot and proven. The robot has a touch sensor on the tip of each leg. The sensors detect contact with the ground, allowing the leg to be planted stably. When the robot moves over rough terrain, the robot body inclines as if becoming parallel to the virtual plane that is defined by the support points of the legs. The ASTERISK robot to which the algorithm has been applied has six limbs that radiate out in six directions, giving it rotational symmetry. Each leg of the robot has a cylindrical working space; the robot can move omnidirectionally without changing its posture. The movement algorithm is an easy, single-pattern operation that maintains a stable state at all times, and the robot can move without high-speed, real-time processing. The operation and effectiveness of this algorithm are verified on a slope and on steps through the experiment.