Wyniki wyszukiwania - BazTech

1

The study of stress-strain state elements of the truck semi-trailer body bottom

Lyashuk Oleg, Levkovych Mykhailo, Vovk Yuriy, Gevko Ivan, Stashkiv Mykola, Liubomyr Slobodian, Pyndus Yuriy

Zeszyty Naukowe. Transport / Politechnika Śląska

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2023

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z. 118

161--172

EN

Research on the influence of geometric parameters of body bottom elements on the stress-strain state (SSS) of the truck with the general application of computer simulation methods was conducted. The nature of the change in static stress and displacement depending on the change in the proportions of the crosssection of the channel at fixed geometric dimensions of the workpiece and the thickness of the workpiece and the bottom material of the body has been studied. Analytical, numerical and experimental methods were used in the study of the stress-strain state of the metal structure of car bodies. Its weight minimization is an important aspect of a truck body design. Because an excess weight leads to increased production costs, reduced payload and reduced fuel efficiency. According to the concept of weight reduction with the provision of a given strength, the body model with variable parameters of the bottom elements is modelled and analyzed. CAD - body models and analysis of the stress-strain state of the channels of the bottom of the bodies have been performed using the software package SolidWorks.

2

Sustainability assessment of the energy generation systems

Drożdż Wojciech, Vovk Yuriy, Widera Katarzyna, Łopatka Agnieszka, Gawlik Andrzej

Journal of Sustainable Development of Transport and Logistics

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2023

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Vol. 8, No. 2

249--258

EN

Purpose: This paper aims to assess the sustainability of energy generation systems in various European Union countries. It seeks to understand the diverse challenges and opportunities these countries face in transitioning to sustainable energy. Methodology: The study employs a multi-criteria decision analysis (MCDA) approach, considering economic, environmental, and social aspects. Data from various databases, including Eurostat, the International Energy Agency, and the World Bank, were analyzed. Results: The results reveal significant variations in sustainability performance across different countries and regions. With strong policy support and high public awareness, Scandinavian countries generally performed well across all sustainability indicators. In contrast, Eastern European countries faced more challenges due to their heavy reliance on fossil fuels. Theoretical Contribution: This study contributes to the ongoing discourse on sustainable energy by providing a comprehensive assessment of the sustainability of energy generation systems. It underscores the complex and multifaceted nature of sustainability and the various factors that influence it. Practical Implications: The findings provide valuable insights for policymakers and energy providers. They highlight the importance of policy support, public awareness, and acceptance in promoting sustainable energy. They also underscore the need for continued efforts and interventions to address the challenges faced by countries heavily reliant on fossil fuels.

3

Innovative stress analysis and machine learning forecasting for semi-trailer truck body durability

Lyashuk Oleh, Levkovych Mykhailo, Stashkiv Mykola, Pastukh Oleh, Martyniuk Volodymyr, Mironov Dmytro, Rabe Marcin, Vovk Yuriy

Journal of Sustainable Development of Transport and Logistics

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2023

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Vol. 8, No. 2

43--57

EN

This article presents an in-depth analysis of the stress-deformation state (SDS) in the bottom structure of a semi-trailer truck body. Engineering analysis was conducted utilizing the SolidWorks software, focusing on a comprehensive CAD model of the semi-trailer truck body. The study explored variations in SDS parameters resulting from alterations in the geometric parameters of the body bottom elements. The research investigated alterations in static stress and displacement relative to changes in the proportions of the cross-section of the channel while maintaining fixed geometric dimensions of the workpiece, thickness of the workpiece, and the material of the body bottom. Graphical representations were generated to illustrate the variations in static stress, displacement, and safety margin concerning the thickness of the shelf and channel. Additionally, dependencies were derived that correlate static stresses in the channel with the thickness of the channel wall and the thickness of the body bottom sheet. The study results were compiled and summarized, offering valuable insights into the stress-deformation state of the semi-trailer truck body's bottom. Furthermore, machine learning techniques, specifically the RandomForest algorithm, were implemented in a Python environment to predict changes in static stress based on various factors. The model's predictions were validated by comparing predicted static stress values with actual values on a test sample. These findings facilitate efficient selection of appropriately sized elements by predicting static stress values, employing the RandomForest machine learning algorithm.

4

Complex evaluation of the efficiency of urban consolidation centers at the micro level

Savchenko Lidiia, Grygorak Mariya, Polishchuk Volodymyr, Vovk Yuriy, Lyashuk Oleg, Vovk Iryna, Khudobei Roman

Zeszyty Naukowe. Transport / Politechnika Śląska

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2022

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z. 115

135--159

EN

A methodical approach for the determination of economic and socio-environmental costs in the application of the city consolidation center at the micro level was proposed and tested on real data. Two options of urban delivery of small shipments are considered, in particular, for e-commerce - direct delivery and delivery through the micro-consolidation center. The system of indicators proposed in this work allows a detailed assessment of the economic component of direct and consolidated delivery, including transportation costs, the functioning of the consolidation center costs and costs for pedestrian delivery to the residential district customers. Socio-economic indicators allow considering the interests of other residents of the city, suffering from a dense traffic flow and harmful emissions from freight vehicles. The proposed method of integrated assessment was tested on real data of a micro district of the city. The results made it possible to estimate the proportion of each component of expenditures in the economic, socio-environmental and total costs for both delivery options. The analysis of the sensitivity of costs to changes in the input parameters showed the difference in the strength of influence, and the rating of influencing factors. The proposed method allows us to estimate the economic costs of all participants in the urban delivery process for small shipments, as well as to prove the rationality of using micro-consolidation to serve a micro district of a large city.

5

Scheduling technique of route vehicles on duplicating stretches

Azemsha Siarhei, Kravchenya Irina, Vovk Yuriy, Lyashuk Oleg, Vovk Iryna

Zeszyty Naukowe. Transport / Politechnika Śląska

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2021

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z. 113

5--16

EN

Schedule optimization is a proven strategy to improve service quality for public transport networks. However, current research mostly optimizes schedule design using prior knowledge of users’ routings, ignoring the optimization of public transport schedules on duplicating stretches of route vehicles. This article presents a new alignment technique of time intervals between consecutive vehicles of different routes on duplicating stretches, considering existing public transport networks in attaining optimization of public transport schedule. Scheduling technique of route vehicles on duplicating stretches includes some steps: analysis of public transport network and determining a lot of duplicating stretches, calculation of the optimal time intervals among arrivals of route vehicles and alignment of these intervals among consecutive route vehicles on duplicating stretches, realization simulation model of urban passenger transport within the simulation modeling system of GPSS World. Furthermore, testing the optimization technique of route vehicle scheduling, analysis of the quality of adjusted schedule with route vehicles of different kinds included, and determining the optimization efficiency for duplicating stretches. The adjusting technique of urban passenger transport schedule allows to increase movement steadiness of consecutive vehicles of different routes on duplicating stretches, adjust traffic intervals for each route, shorten the traffic load on stations, reducing idle time and queue lengths of route vehicles in front of transport stops and also minimize waiting time for route vehicle by those passengers who can be transported along several routes. Improving the bus schedule on duplicating stretches in Gomel is illustrated demonstrating the technique developed. This scheduling technique can be used by carriers and transport operators to improve the quality of services provided.

6

Method of calculating the design parameters of a modulator anti-lock braking system with a high flow of working fluid

Zhilevich Mikhail, Ermilov Sergey, Kapski Denis, Vovk Yuriy, Lyashuk Oleg, Vovk Iryna

Zeszyty Naukowe. Transport / Politechnika Śląska

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2021

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z. 110

199--210

EN

The design dimensions of the executive hydraulic cylinders of the brake system of heavy-duty mining dump trucks cause high fluid flow during the braking process. Therefore, dimensions of the anti-blocking system modulator spool pair require unique electromagnets or hydraulic amplifiers to control. These solutions do not allow the required modulator performance. Thus, a modulator scheme with a division of the flow of fluid from the source to the brake cylinders was developed. This scheme allows during emergency braking passing, an additional amount of fluid to cylinders through the valve, installed parallel to the main valve upon pressure increase phase and controlled by the pressure difference. The task is to develop a method for calculating the main structural dimensions of a modulator. The calculation of the valve of the second cascade, installed in parallel to the main stage, is carried out for the emergency braking mode with the maximum flow rate to ensure the required performance of the braking system. The balance of fluid flows equations is compiled at the key points. The flow rate of the fluid through each of the valves is determined by the Torricelli formula, and the pressure difference across the valves is assuned equal. The obtained relations allows building a family of Q-p curves, which can be used to select the diameter and stroke of the additional valve depending on the flow rate in the brake system.

7

Combination of different means of parcel deliveries in urban logistics in adverse weather conditions

Savchenko Lidiia, Zhigula Sophia, Yurchenko Kate, Vovk Yuriy, Oleksiuk Andrii

Journal of Sustainable Development of Transport and Logistics

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2021

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Vol. 6, No. 1

6--17

EN

Purpose. The main purpose of the article is to assess the economic and socio-environmental costs of the urban delivery of small shipments in difficult weather conditions with a combination of different delivery means - a car, a motorcycle, a bicycle and a pedestrian courier. Methodology. The methodology for determining the integrated costs of urban logistics for small shipments in difficult weather conditions is based on an assessment of the region's synoptic data, statistics on road accidents and congestion levels, as well as on the specific operating conditions of the delivery company. Results. The result of the work is the cost of combining all - season delivery means with a motorcycle and a bicycle, which can only be used under favorable weather conditions. The theoretical contribution. The theoretical contribution consists in the presentation of a methodology that makes it possible to estimate the complex costs of a combination of various urban delivery means. Practical implications. Practical implementation consists in calculating the total costs for the delivery of goods for an online store in Kyiv with various combinations of delivery means, which allows to choose the most successful alternative.

8

Blending control of the trolleybus traction and brake drives to enhance the braking efficiency of a vehicle

Safonau Andrei, Vovk Yuriy, Lyashuk Oleg, Khudobei Roman

Journal of Sustainable Development of Transport and Logistics

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2020

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Vol. 5, No. 2

49--61

EN

Widespread usage of emission free public transport is the preferred strategy in many cities to reduce a congestion and pollution from the road traffic. The trolleybus is a kind of urban public transport, i.e. a fully electric vehicle, which is considered as a promising tool to enhance the efficiency of public transport and to attain the goals of sustainable development and quality of city life. The operation control of service brake system and secondary brake system (the braking torque of traction electric motor) is realized with help of one pedal in the trolleybus. Thus, there are modes of the joint operation for these systems during the braking process. Authors focus on the development of rule-based algorithm for the blending control of traction electric motor and anti-lock braking system to enhance the overall braking efficiency of a vehicle. The mathematical model of the trolleybus braking dynamics was developed for this purpose. Test bench and ride tests on different road surfaces were carried out to determine the parameters of vehicle braking efficiency and to validate the developed mathematical model. The corresponding experimental data were used to analyse the efficiency of proposed rule-based strategy for the blending control of traction electric motor and anti-lock braking system of the trolleybus. As a result, the availability of proposed control algorithm is confirmed, which secures the required braking efficiency and provides a high braking stability of the vehicle.