Acta of Turin Polytechnic University in Tashkent

The EXPERIMENTAL DEHYDRATION OF WET SEMI-FINISHED LEATHER PRODUCTS ON A CERAMIC-METAL BASE PLATE

Ayder Nabiev, Zarnigor Rakhimova , Gerasim Tsoy, Gayrat Bahadirov — Thu, 31 Mar 2022 00:00:00 +0000

The article presents the results of an experimental study to determine the influence of such factors as the feed speed, the pressing force of the squeezing rollers on the amount of residual moisture content in the semi-finished leather product after the liquid chrome tanning operation. The experiments were conducted using a cermet base plate, on which one layer of the folded wet leather semi-finished product was previously put and fed vertically between rotating squeezing rollers. The D-optimal method of mathematical planning of the experiment with the K. Kano design matrix was used to conduct experiments. As a result of the study, a mathematical model was obtained for the dependence of the feed speed and the pressing force of the squeezing rollers on the amount of moisture extracted from a wet leather semi-finished product. The analysis of the results of experimental study showed that the use of a base plate made of cermet during squeezing a wet leather semi-finished product increases the efficiency of moisture extraction in comparison with a metal base plate.

A ONE-DIMENSION OF NOSTATSIONAL FILTRATION PROCESS OF GAS IN A TWO-LAYER POOR ENVIRONMENT MATHEMATICAL MODEL AND NUMBER METHODS OF SOLVING IT

Temur Turdiyev — Thu, 31 Mar 2022 00:00:00 +0000

Annotation - an analysis of the hydrodynamic development of the filtration process of liquids and gases in the porous medium, a mathematical model of the filtration process of gases in dynamically porous media, a finite difference method for solving the boundary value of gas motion in a porous medium and its algorithm considered.

The LTE Network Reliability Assessment Models and Analytical Expressions

Utkir Matyokubov, Dilmurod Davronbekov, Tulqin Matqurbanov — Thu, 31 Mar 2022 00:00:00 +0000

Keng polosali tarmoqlar, ayniqsa Long Term Evolution (LTE)/LTE Advanced (LTE-A) yuqori tezlikdagi simsiz ma’lumotlarni uzatish, foydalaniladigan tayanch stansiyalarning qamrovi va protokol dasturiy ta’minotining murakkabligi tufayli yuqori talabga ega. Bunday hollarda tarmoqning samaradorligi asosan ikkita muhim xususiyatga bog'liq bo'lib, ular tarmoqning ishonchliligi va hayotiyligidir. Ishonchliligi va hayotiyligini oshirish uchun LTE arxitekturasi va tarmoq tuzilishini hisobga olish kerak.

Ushbu maqola LTE/LTE-A tarmoqlarining struktura arxitekturasi asosida ishonchlilikni baholash modellarini ishlab chiqadi. Ishlab chiqilgan modellar asosida ishonchlilikni baholashning analitik ifodalari berilgan. Bundan tashqari, ushbu modellar va analitik ifodalar yordamida LTE tarmog'i raqamli tahlil qilinadi.

The CALCULATION OF THE AMOUNT OF EMISSIONS OF HARMFUL SUBSTANCES BY CARS AT URBAN INTERSECTIONS

Aziz Ernazarov — Thu, 31 Mar 2022 00:00:00 +0000

A study of the traffic flow of one of the busiest central streets of the city of Jizzakh – I. Karimov Avenue. A complete description of the intersections of this transport highway is given. To perform the calculations, observations and counting of the number of vehicles crossing intersections were carried out. The calculation of the amount of exhaust gas emissions into the atmosphere was made.

The ANALYSIS OF THE TECHNICAL CONDITION OF THE WEIGHT CHECKING WAGON TYPE 640-VPV-277 OF THE JOINT STOCK COMPANY "UZBEKISTON TEMIR YULLARI"

Nodir Adilov — Thu, 31 Mar 2022 00:00:00 +0000

In this article, the assessments of the technical condition of the metal structure of the weighing wagon 640-VPV-277 were studied. When wagonrying out calculations of the metal structure of a weight-chekcing wagon, the wall thickness will be taken taking into account its decrease by the average wear value to determine whether the strength of the wagon structure complies with the required standards.

The DEVELOPMENT OF THE NETWORK OF URBAN ROADS AND STREETS (ON THE EXAMPLE OF THE CITY OF URGENCH)

Fazilat Saydametova; Amir Beketov; Shakhnoza Khalimova, Abduvokhid Yunusov — Thu, 31 Mar 2022 00:00:00 +0000

The article analyzes the state of the road network in Urgench. The importance of the organization of highways in improving the future road network of the city will be considered as a key issue. It covers the results of studies on the organization of the process of safe traffic and improving the capacity of the road, as well as suggestions and recommendations for solving existing problems.

The proposed measures will significantly alleviate congestion on the city street network without disrupting transport links within the city.

The MODELLING OF ENERGY CONSUMPTION OF THE BATTERY ELECTRIC VEHICLES

Jamshid Mavlonov — Thu, 31 Mar 2022 00:00:00 +0000

Battery electric vehicles (BEVs) are gaining larger market share. Accurate computation of the BEV’s energy consumption is important to avoid running out of energy while driving. Therefore, it is important to develop a backward model which estimates the energy consumption of the BEV. This article describes a model that evaluates a BEV’s energy consumption. The aim of this paper is modeling of BEV using MATLAB/Simulink software based on a real BMW i3 2014 data. The model consists of vehicle dynamics, single-speed transmission gearbox, electric machine and battery blocks. The detailed analysis on each block is performed and the governing equations for each block is derived taking into account both traction and regeneration modes. Moreover, constraints in terms of limitation in power for each block is considered. Finally, the results of the model are compared with the experimental data which obtained from Argonne national laboratory database in EPA Urban Dynamometer Driving Schedule (EPA UDDS) driving cycle.

The TELEVISION SYSTEMS FOR MEASURING THE COORDINATES OF INDUSTRIAL AND MOBILE ROBOTS

Temurbek Rakhimov — Thu, 31 Mar 2022 00:00:00 +0000

Nowadays, the use of innovative intelligent technologies in the control of industrial robots is becoming increasingly popular. This article discusses the use of television systems in measuring and controlling the coordinates of industrial robots. It is possible to control the object of movement and speed parameters of the executive element of the industrial robot through television systems. With the information detected by the television measurement system, broader possibilities of robot control are provided by flexible modification of control programs in real time. Using monocular television camera systems to measure the coordinates of industrial robots, it is possible to study space and underwater systems, detect errors that occur during manipulation. The structural and geometrical dimensions of the monocular television measuring camera system, the functional scheme of the correlation optical measurement system to account for velocity in moving positions, the functional scheme of the differential correlation optical measurement system and their use, and mathematical models of calculating detected errors are given.

The Neural Networks Performance Improvement With Gaussian White Noise Augmentation

Muniskhon Abdurashitova — Thu, 31 Mar 2022 00:00:00 +0000

Data augmentation is a strategy for creating synthetic data from existing data by adding slightly changed copies of current data to expand the amount of available data. 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 data augmentation method employing Gaussian white noise.

The CONSERVATIVE DIFFERENCE SCHEMES FOR OPTIMAL PLACEMENT OF HEAT SOURCES IN A PARALLELEPIPED

Bobomurod Khayitkulov — Thu, 31 Mar 2022 00:00:00 +0000

In this paper, a method and algorithm for solving the non-stationary problem of optimal placement of heat sources of minimum power in the space have been developed. As a result, the temperature in the space is within the specified limits and the value of the functional is minimized. The mathematical model of the process is described by the heat conduction equation with a variable coefficient. The numerical model of the problem is constructed using implicit conservative difference schemes. To solve the problem of thermal conductivity control, a linear programming problem was used. Software for numerical modeling has been developed. The results of a computational experiment are presented.

The ON SOME PROPERTIES OF CONTINUED FRACTIONS AND RETURN TIME FOR CIRCLE HOMEOMORPHISMS

Javlon Karimov — Thu, 31 Mar 2022 00:00:00 +0000

In present work we study general properties of continued fractions and the return times for circle homeomorphisms with irrational rotation number. Consider the set $X$ of all orientation preserving circle homeomorphisms $T$ with one break point and irrational rotation number. There are given proof of the main theorem for return time using visualizations and constructed example to computing return time for irrational rotation number.