Acta of Turin Polytechnic University in Tashkent

A, The A DEVICE FOR ELECTRICITY GENERATION USING ALTERNATIVE RENEWABLE ENERGY SOURCES

2022-05-06T11:35:56+00:00

The possibility of generating electrical energy from the thermal expansion of liquid and solid matter is considered. Setting up the device using solely the liquid thermal expansion and contraction phenomena requires high-volume vessels that shouldbe able to sustain very high pressures, which is expensive and difficult to realize. In the case of using the thermal expansion and contraction of only solid material, the problems will include their small coefficients of thermal expansion compared to liquids, the impossibility of using the volume expansion, and very slow displacement velocity, which is difficult to accelerate.If both liquid and solid materials are used in combination, one can find reliable and cost-effective compromise variants of the device for different magnitudes of power.

The principle of the working of the device, designed using both solid and liquid materials, is presented. The small but powerful displacement will be transformed into high pressure and this pressure is transformed into liquid flow through the transducer. The latter transforms the flow into a circular motion and transfers this to the generator, which produces the electricity.

The new type of device, which uses a renewable energy source, requires high pressure vessels. The pressure in the vessel (5) can be reduced by increasing its diameter: if the radius r_1inputincreases twice, the pressure P₁decreases four times. On the other hand, decreasing the pressure leads to the increased volume of the working liquid, which is related to energy losses.

As the processes of thermal expansion and contraction are very slow, transforming them into fast enough linear or circular motion requires modern and very accurate techniques. It is important to find the optimal and compromise values of multiple operating parameters, such as the length of the steel rod, the pressures in the vessel (5) and in the low-pressure cylinder, the diameters of the vessels, the volume of working liquid, the flow rate, and the speed of angular velocity of the shaft of the generator in creating the new type of renewable energy source. However, such a complex task can be simplified noticeably if we develop the high-pressure and high-volume cylinders: the power of the device is in direct proportion to the pressure, which can be sustained by the system. So, by increasing the pressures in the vessel (5) and cylinder (7) by 10 times, the same device can generate 1000 kW energy per hour in our case.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

A, The APPLICATION OF MATHEMATICAL METHODS EXPERIMENTAL PLANNING IN DETERMINING THE DEFECTIVE PARAMETERS OF BREAK-IN OIL

2022-02-07T05:38:32+00:00

This article discusses mathematical methods for planning an experiment to determine the rejection parameters of running oils. When new engines are released and after repairs, internal combustion engines of transport equipment undergo cold and hot running-in. During the break-in process, special break-in oils are used. Break-in oils do not have a specific change schedule, this requires the determination of rejection parameters, the article provides the results of planning an experiment to determine the rejection parameters of the test oil

The DEFINITION OF INTERPHONEME TRANSITIONS OF UZBEK WORDS BY DISCRETE WAVELET TRANSFORMS

2021-12-07T05:13:03+00:00

The article refers to the field of information processing theory on the example of evaluating the use of discrete wavelet transform for processing and recognition of speech signals. The difficulties of recognizing speech signals are described and the advantages of discrete wavelet transform over other traditional methods of signal processing, such as Fourier transform, are given. An algorithm based on a discrete wavelet transform is defined and described in detail. The speech signal is processed on the basis of a discrete wavelet transform. A detailed algorithm for finding the most informative level (scale), which is one of the basic parameters of the discrete wavelet transform, is presented. For the analysis, a speech signal with a sampling frequency of 22050 Hz was used, which was decomposed in scales from 3 to 6 and then using an algorithm to identify the informative level, the level (scale) that most closely describes the original signal was selected and determined. When determining the informative level, the type of the mother wavelet is important. In this article, we used the mother wavelet from the Daubechies family, namely the 4th order Daubechies. The second main parameter of the discrete wavelet transform - shift is determined based on practice (16-20ms) and is equal to 256 samples. Also described is a step-by-step algorithm in combination with a discrete wavelet transform, which allows segmenting a speech signal into phonemes, as a result of which it becomes possible to switch from an analog signal to text. Based on the proposed algorithms, the results of the process of segmentation of a speech signal into phonemic units are presented. Based on the results of the work done, a number of conclusions were identified that had not previously been identified due to the traditional Fourier transform used

The Assembly systems under Industry 4.0 paradigm. SWOT analysis

2021-12-07T04:57:34+00:00

The tendency of the manufacturing is currently moving from mass to customized production. With the rapid success of the digitalization in last decades, manufacturing is expected to be approaching the fourth industrial revolution, coined as Industry 4.0 (I4.0). This paradigm is boosted by technologies such as Internet of Things, Cloud Computing, Robotics, Big Data, and Augmented Reality, that will influence both products and processes, allowing efficiency and productivity improvements. There is much confidence that the future assembly systems will have unprecedented capabilities to satisfy complex customer demands under I4.0 era. Nevertheless, there is still doubts among academics and industry alike that how I4.0 offerings will be affected on assembly systems. Therefore, this paper presents a literature review identifying reoccurring themes and trends of assembly systems under I4.0 and their expected effect on future assembly systems. Central characteristics of focus are strengths, weaknesses, opportunities, and threats are identified and discussed. The findings of this paper can provide support in developing smart assembly systems endeavors for theory and practice. Moreover, industrial practitioners can use the strengths/opportunities offered by Assembly 4.0 to take strategic decisions to decrease the effect of the threats/weaknesses that come along with Assembly 4.0.

SYNERGETIC PROPERTIES OF VEHICLE TO INFRASTRUCTURE IN URBAN DRIVING MODES

2022-02-07T05:49:03+00:00

This paper analyzed the synergistic properties of intelligent transportation systems in local conditions based on a Chevrolet Nexia. Vehicle to the infrastructure of the intelligent transport system has experimented on the example of the “Intelligent start-stop system” in urban traffic modes. We analyzed the vehicle's driving modes and opted for the idle mode to save fuel. The synergy of the vehicle with the traffic light depends on many factors and has been studied on the example of the information model of the “Intelligent start-stop system”. In urban conditions, a vehicle with an “intelligent start-stop system” was saved 8.25% of fuel during 100 km. In addition, emissions of harmful gases into the environment have been minimized. It was found that an average of 132 liters of fuel was saved when one vehicle traveled 20,000 km per year. Moreover, the idling time of the vehicle's engine was characterized by a reduction of 28 - 32 % in 100 km of the total test distance. Also included are the concepts of order parameter and flexible parameter on the principles of synergetic by using intelligent transport systems in the local condition.

The The Processes in Software Engineering

2022-06-03T11:36:30+00:00

It is commonly mistaken that Software Engineering is about coding. However, the work of Software Engineering is beyond writing a code. It composes several important processes before starting producing executables, which is the main product produced by developers. The paper presents the development of any software and consecutive processes needed to accomplish to produce high standard software.

The ISSUES OF DEVELOPING A UNIVERSAL ENERGY MODULE FOR COTTON CULTIVATION AREAS

2022-05-19T08:09:29+00:00

This article gives a rationale idea for developing of a universal energy module tool on the basis of tractor TTZ for aggregation with unified harvesting machines for cotton areas.

The Neural Networks Performance Improvement Using Pink Noise Augmentation

2022-06-03T09:09:14+00:00

Data augmentation techniques artificially generate different versions of a real dataset to increase its size. Many practices have shown an increase in the accuracy of machine learning models after applying them. When training a machine learning model, it functions as a regularizer and helps to reduce overfitting. This work will discuss the improved neural network performance with the pink noise data augmentation in order to model system drifts.

The Engine emissions and fuel consumption assessment for stop-start system implemented compression-ignition internal combustion engine

2022-05-19T08:13:59+00:00

A number of current technologies for internal combustion engines aimed at reducing the fuel consumption and engine noxious and greenhouse gas emissions emerge mainly due to adverse impact of transportation sector on ecology and global warming. The aim of this paper is to study the advantage in terms of fuel consumption and engine emissions, gained through the implementation of stop-start system on diesel ICE and compare the results with conventional engine. To achieve this, a short description of vehicle backward modeling is provided and simulated for NEDC, WLTP driving cycles. Simulation is done for 2 modes: conventional ICE and ICE with stop-start system. Finally, the comparative analysis is done for the results for the two modes through the tabular and graphical representation. Chevrolet Sail 2010 (1,25 L CI), equipped with 5-speed manual transmission system light duty vehicle has been chosen as a reference. Matlab/Simulink environment is used for modeling and simulation purposes.

A Comparison of Engine Oil Life Cycle in Different Vehicles by Using Hydrogen-Gasoline and Gasoline Fuels.

2022-06-23T06:28:03+00:00

In this study three different fuels named methane and gasoline AI-92 added hydrogen were used to test in a gasoline engine.[1] First of all experiments were carried three different kinds of engine oils named Castrol (syntetic5W40), Mannnol (mineral 10W40) and Lukoil (semisyntetic5W40), namely unused and used oils it taken from of three types motor vehicles.[2] The change in characteristics of flash temperatures, number of alkali and kinematic viscosity of test oils were analyzed.[3] A theoretical model was established with the result by ISO 2592:2000,[4] ISO 2909 – 1981[5], laboratorial ionizer I-160-MI. The test synthetic and mineral oils were obtained from cars travels approximately 8,000-10,000 km in 250-310 days in the typical urban traffic condition of Uzbekistan. The recommended approach can provide some reference for end users to drain their motor oil reasonably.

The Mathematical model of a positioning hydraulic drive

2022-09-21T06:20:37+00:00

Today, the hydraulic drive is widely used in road construction equipment and has become an integral part of modern multitasking machinery and industrial equipment. Cars in developed countries cannot be imagined without a hydraulic drive. It allows you to adjust the speed without steps, make full use of the power of the drive motor, improve the utilization rate and improve the productivity of the machine.

The PROSPECTS FOR THE DEVELOPMENT OF ELECTRIC VEHICLES IN UZBEKISTAN

2022-10-10T06:55:24+00:00

The development of the electric vehicle industry in the world, as well as in Uzbekistan, is one of the promising areas in the field of transport aimed at improving the environment. The development of this industry requires the solution of a number of problems, as well as the development and formation of solution methods and the development of infrastructure. The formation of an infrastructure for electric vehicles requires the creation of new markets for innovative products and therefore needs active support in various industrial and social sectors of the state. It is also necessary to constantly analyze the state and dynamics of the development of the electric vehicle market in the world and in Uzbekistan.