Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal <p>Acta of Turin Polytechnic University in Tashkent (ACTA TTPU) is a double-blind, peer-reviewed, quarterly, open access scientific journal that creates an academic platform for professionals and researchers to contribute innovative work in the field.</p> <p>ACTA TTPU is published as four issues per year, March, June, September and December. All publication policies and processes are conducted according to the international standards. See our Policies page for more information.</p> <p>This journal focuses on the topics including vehicle dynamics, optics, fuel cells, material science, mathematical modeling and simulation, fluid mechanics, mechatronic systems, etc.</p> <p>All accepted articles are published in full text on the Internet.</p> en-US j.abdujalilov@polito.uz (Abdujalilov Javlonbek) actattpu@polito.uz (Boburjon Nurullaev) Wed, 22 Dec 2021 18:32:22 +0000 OJS 3.3.0.3 http://blogs.law.harvard.edu/tech/rss 60 The TECHNIQUE OPTIMIZATION THE LOCATION OF SOME NETWORKS OF SERVICE INSTITUTIONS http://acta.polito.uz/index.php/journal/article/view/59 <p><em>Mathematical models, algorithms and programs for optimizing the location of some networks of service institutions have been investigated and developed, both in urban development and in rural areas, i.e. a toolkit for optimization for organizing a network of objects and service institutions (taking into account the existing planning structure of development).</em></p> Erkin Khaltursunov Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/59 Wed, 01 Sep 2021 00:00:00 +0000 On the parameters influencing the brake pedal "feel" in passenger cars http://acta.polito.uz/index.php/journal/article/view/61 <p>Nowadays there exist two driving forces that impose the development of already existing braking systems and development of new components and technologies: legislation and consumers. Alluding to automotive components and brake components in particular, it is noteworthy mentioning that their design has to include the considerations of not only safety, but also comfort for users. “Brake pedal “feel” is of equal significance for both safety and comfort.Consumers expect a good “feel” of braking for easier driving and to fulfill the driver’s intention of deceleration so that to ensure confidence in the sense of personal safety and comfort.</p> SEYRAN ASANOV Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/61 Wed, 01 Sep 2021 00:00:00 +0000 The CRITICAL REVIEW OF THE PERFORMANCE OF THE BATTERY ELECTRIC VEHICLE AVAILABLE ON THE MARKET http://acta.polito.uz/index.php/journal/article/view/63 <p>The paper analyses the battery electric vehicles available on the market. The data for more than 80 models of such vehicles are collected. The vehicles’ performance is compared with different power requirements. The electric motor power, battery capacity, and vehicle driving range are analyzed to fulfill such requirements. Based on the results of the critical analysis the future possible activities in the field of Battery Electric Vehicles (BEVs) performance improvement are defined.</p> Jamshid Mavlonov Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/63 Wed, 01 Sep 2021 00:00:00 +0000 The Stress and deformation analysis of the brake pedal using Finite Element Method http://acta.polito.uz/index.php/journal/article/view/64 <p>Brake pedal is one of the most crucial components of the braking system of all types of vehicles.During the design phase it is of vital importance to make sure that the pedal is able to withstand the loads exerted by the driver during the deceleration process. Moreover, the pedal must be "ready" to withstand large loads in a hard braking process. This article describes the static stress and deformation analysis of the brake pedal with the help of Finite Elements Method (FEM). The paper summarises that a safe region of stress and deformation is achieved even when a force of 1100 N is applied at the brake pedal.</p> SEYRAN ASANOV Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/64 Wed, 01 Sep 2021 00:00:00 +0000 The Configurations of large transport aircraft: prospect and problems http://acta.polito.uz/index.php/journal/article/view/68 <p><strong>Abstract –</strong> This paper discusses about problems of possible development of dedicated, high capacity, large civilian freighter aircraft.<br />The main disadvantages of currently operating air transport are discussed. The flight performance of proposed dedicated cargo aircraft with 120 tonnes payload capacity is compared with existing converted freighter aircrafts Boeing 747-200F and Antonov 124 (Ruslan). A wide range of values of payload and flight range are studied to get the better results from parametric research. An assessment of flight performance and economical features are evaluated by three criteria: weight efficiency, fuel efficiency and transportation cost.</p> Abdulaziz Azamatov, Kakhramon Rakhimqoriev, Dilmurod Aliakbarov, Abdurakhim Nabijonov Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/68 Wed, 01 Sep 2021 00:00:00 +0000 The DEVELOPMENT OF A HIGHLY EFFICIENT MACHINE FOR DEHYDRATION OF MOISTURE-SATURATED MATERIALS http://acta.polito.uz/index.php/journal/article/view/75 <p><strong>Abstract – </strong>A technological machine for the dehydration of moisture-saturated materials is developed. In the design of the<br />machine, moisture-saturated materials (for example textile fabrics, leather, and paper) are sequentially drawn between two roller pairs<br />located one above the other by a chain conveyor and a base plate. At that, the base plate is composite, with rollers at the ends, along<br />which the processed wet material moves a certain distance from its initial position, due to friction forces with the lower working rollers.<br />As a result, the untreated strip fold over the base plate is transferred to the sidewall and additionally processed by the upper working<br />roller. Consequently, the area and quality of treating the processed material between the pairs of rotating working rollers increase.</p> <p> </p> Ayder Nabiev, Gerasim Nikolaevich Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/75 Wed, 01 Sep 2021 00:00:00 +0000 The ANALYSIS OF REQUIREMENTS FOR WEIGHT AND DIMENSIONAL INDICATORS OF FREIGHT VEHICLES IN THE REPUBLIC OF UZBEKISTAN http://acta.polito.uz/index.php/journal/article/view/79 <p><strong>Annotation.</strong> In order to ensure the safety of highways, the permissible values of mass, axle loads and dimensions of vehicles have been established. Violations of permissible parameters - the movement of vehicles with excess of the permissible mass or axle loads (with or without cargo), leads to premature destruction of the roadway, the cost of unscheduled repairs, and a decrease in the level of road safety. In the course of business activities, it may be necessary to drive with parameters exceeding the permissible values. Vehicles performing such transportation are called heavy and (or) large-sized vehicles (HLV). The movement of vehicles and the transportation of goods in excess of the permissible parameters without special permission is an administrative offense, liability for which is provided for by law. The system of weight and dimensional control (weight control, dimensional control) is designed to detect the facts of movement of vehicles with excess of the permissible weight and (or) dimensional parameters without special permission in order to attract the owners of such vehicles to administrative responsibility and collect funds in order to compensate for the damage caused to the road. The system of weight and dimension control combines weight control and dimension control of vehicles in one whole. The list of normative and legal documents, on the basis of which the system of weight and size (weight, dimensional) control works, is given. The organization of movement on highways of large and heavy vehicles, as well as their overload on wheel axles, requires attention to ensuring the safety of roads and road safety. In this regard, in world practice, in order to prevent a reduction in the service life of road surfaces and ensure road safety, control and limitation by legislative and regulatory acts of the weight and dimensional parameters of vehicles are provided. The permitted weights of vehicles are given (with or without cargo).</p> Aziz Khalmukhamedov Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/79 Wed, 29 Dec 2021 00:00:00 +0000 The effect of different regimes for premixed turbulent combustion to the burning speed inside the combustion chamber of a 2 liter 4 in-line cylinder spark ignition ICE. http://acta.polito.uz/index.php/journal/article/view/86 <p><strong>Abstract –</strong> This article describes different regimes for premixed turbulent combustion in gasoline internal combustion engines and the<br />way they enhance the burning speed of a turbulent flame comparing with a laminar combustion. For this reason, we classify different regimes and summarize them in a single diagram called Borghi plot where it is possible to distinguish them and separately analyze depending on the characteristics of the turbulence. Finally, we can determine the effect of each regime to the turbulent burning speed<br />of a premixed flame.</p> Umidjon Usmanov Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/86 Wed, 01 Sep 2021 00:00:00 +0000 THE THERMODYNAMIC FORMALISM FOR CIRCLE MAPS WITH ALGEBRAIC ROTATION NUMBER http://acta.polito.uz/index.php/journal/article/view/89 <p>In present paper we study the orientation preserving circle homeomorphisms with singularity of break type.<br>Let $T \in C^{2+ \varepsilon} (S^{1} \setminus \{x_{b} \})$, $\varepsilon&gt; 0 $, be a circle homeomorphism with<br>one break point $x_{b}$, at which $ T'(x) $ has a discontinuity of the first kind and both one-sided derivatives<br>at the point $x_{b} $ are strictly positive.<br>Assume that the rotation number $\rho_{T}$ is irrational and its decomposition into a continued fraction<br>has a form $ \rho:=\omega_{k} = [k,\,k,\ldots,k,\ldots] = \frac{-k + \sqrt {{{k} ^ {2}} + 4}} {2}, \, \, k \ge 1 .$<br>E. Vul and K. Khanin in \cite{VKh} showed that the renormalization transformation on the space of such circle<br>maps has unique periodic point $( F_{i},G_{i}),\,\,i=1,2$ with period two. Moreover,<br>$ F_{i}$ and $G_{i})$ are fractional linear maps.<br>We denote by $T_{i},\,i=1,2$ the circle homeomorphisms associated by pair $(F_{i},G_{i}).$<br>Let $B(T_{i}),\,i=1,2$ the set of all circle maps which are $C^{1}$ conjugated to $T_{i},\,i=1,2.$<br>We build a thermodynamic formalism for all maps of $B(T_{i}),\,i=1,2.$</p> Javlon Karimov Copyright (c) 2021 Acta of Turin Polytechnic University in Tashkent http://acta.polito.uz/index.php/journal/article/view/89 Wed, 01 Sep 2021 00:00:00 +0000