Engineering technological systems
Journal EEJET
All articles in open access journal which are indexed by Scopus (H-INDEX 36, SJR 0.288, SNIP 0.573)
In this issue:
Rationale for choosing the airfoil of a UAV wing using a dynamic ground effect principle
Vehicles that use the principle of dynamic ground effect principle are innovative vehicles that have prospects for use as high-speed unmanned vehicles. It is known that when an aircraft moves near the ground, the phenomenon of increasing lift occurs, which allows for contactless movement at high speeds. However, the effectiveness of this ground effect depends on the airfoil shape. The object of this study is the aerodynamic processes that occur during the movement of an unmanned aerial vehicle near the ground. READ MORE
Development of a mathematical model for the cooling channel of a liquid propellant rocket engine’s chamber with respect for variations in coolant density
This study focuses on the processes occurring within the cooling channels of a liquid rocket engine chamber. It is important to note that, from a design-stage efficiency prediction perspective, the cooling system is the most critical part of the engine chamber. This is because it cannot be tested without costly and labor-intensive fire tests. Therefore, mathematical models of heat transfer and fluid dynamics must describe accurately all processes taking place in the chamber. READ MORE
Development of excavator arm movement with wireless control using Bluetooth and the Internet of Things (IoT)
This research is to develop a wired control system into a wireless control system on a laboratory scale mini excavator. First step is to review the development of the drive system and control system on previous excavator models, change the pneumatic drive system to electro-pneumatic, changing the control system from wired control to wireless control using Bluetooth and Internet of Things (IoT) system. The excavator with scale 1:14 is driven by a pneumatic system. READ MORE
Improving the soil bin for studying rotary tools taking into account the kinematic features of interaction with the soil
The object of this study is experimental equipment in the form of a soil bin intended for scientific and educational investigation of rotary tools. The task solved was to clarify the specificity of rotary tools operation and to design a small-sized soil bin taking into account this specificity. The data collected during experimental research and theoretical analysis confirmed the determining influence of the kinematic parameter on the indicators of interaction between the rotary tool and soil. READ MORE
Determining the stability of roll-back stretches in steep layers when unloading a coal rock massif
The object of this study is the condition of side rocks in a coal rock massif with preparatory workings. The task solved was to ensure the stability of preparatory workings to improve the safety of miners' activities. The bearing capacity of protective structures in the preparatory mining workings along the length of the excavation section in a coal mine was comparatively assessed. The operational condition of the roll-back stretch, when using a protective technique that involves coal pillars, is provided for at their relative deformation e<0.25 and relative volume change dV<0.1. READ MORE
Defining patterns in the intensification of hemp stalk retting processes
The object of this study is the technological operations of primary hemp stalk processing, factors that intensify the retting process, and stalk crushing. The task addressed was the identification of technical and technological solutions that would enable intensification of the production processes for hemp retting. Based on the research results, it was established that placing the flattened stems in natural and polypropylene bags, compared to cellophane bags, accelerates the preparation?time of retted stalks in a vertical position by 1.19?times, and in a horizontal position by 1.38?times. READ MORE
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Assessing the impact of sewing machine thread take-up mechanism parameters on the magnitude and nature of thread take-up
The subject of this study is the needle thread take-up mechanisms (NTТM) of modern chain stitch sewing machines of classes 400 and 600. The principal issue with these mechanisms is the complexity of their adjustment because of the large number of adjustable parameters and the need for clear recommendations for proper setup, which negatively affects their performance. The research involved analyzing the impact of NTTM’s kinematic parameters and various thread path configurations in machines. READ MORE
Designing optimal geometry of the radius die for broaching cases
The object of this study is the technological process of broaching cartridge cases through a radius die on a mandrel. The work is aimed at solving the actual scientific and technical task of improving the technological process of broaching on a mandrel through a die in the manufacture of cartridge-case type forgings, which provides an increase in the stability of broaching dies. The finite element method (FEM) was used to simulate the processes of broaching cartridge cases through the die. READ MORE
Determining the influence of technological parameters of the laser processing of plastic cards edges on improving their wear resistance
The object of this study is plastic cards for various purposes, which are a multilayer structure. The main factors affecting the wear of cards are environmental influences, storage and use conditions, and equipment for reading our personalized information. During the operation of plastic cards, the most common defects are peeling of the top protective layer and violation of the integrity of the card structure. An increase in the frequency of such operational defects may be caused at the production stage by the peculiarities of a die-cutting process. READ MORE
Development of a magnetic activator to protect an electric water heater against scale formation
The paper is dedicated to the research and development of a magnetic activator for the prevention of scale formation in electric water heaters, which is a pressing problem in regions with hard water, typical for Сentral Kazakhstan. During the operation of water heaters, salt deposits on heating elements lead to increased energy consumption and reduced efficiency. The developed activator uses powerful neodymium magnets that change the structure of the hardness salts in the water, preventing their deposition in the form of scale. READ MORE
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