Scientific Journal of Silesian University of Technology-Series Transport最新文献_第5页

THE STUDY OF STRESS-STRAIN STATE ELEMENTS OF THE TRUCK SEMI-TRAILER BODY BOTTOM 半挂车车体底部应力-应变状态元研究

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.11

O. Lyashuk, Mykhailo Levkovych, Y. Vovk, Ivan Gevko, M. Stashkiv, Liubomyr Slobodian, Y. Pyndus

{"title":"THE STUDY OF STRESS-STRAIN STATE ELEMENTS OF THE TRUCK SEMI-TRAILER BODY BOTTOM","authors":"O. Lyashuk, Mykhailo Levkovych, Y. Vovk, Ivan Gevko, M. Stashkiv, Liubomyr Slobodian, Y. Pyndus","doi":"10.20858/sjsutst.2023.118.11","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.11","url":null,"abstract":"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 cross-section 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.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43710307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ABRASIVE WEAR RESISTANCE OF FE3AL AND STELLITE 6 COATINGS FOR THE PROTECTION OF VALVE SEATS SURFACES 阀座表面保护用FE3AL和钨铬钴合金6涂层的耐磨性

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.15

B. Szczucka-Lasota, W. Tarasiuk, P. Cybulko, T. Wȩgrzyn

{"title":"ABRASIVE WEAR RESISTANCE OF FE3AL AND STELLITE 6 COATINGS FOR THE PROTECTION OF VALVE SEATS SURFACES","authors":"B. Szczucka-Lasota, W. Tarasiuk, P. Cybulko, T. Wȩgrzyn","doi":"10.20858/sjsutst.2023.118.15","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.15","url":null,"abstract":"The development of a technology that increases the service life of valve seats in CNG/LNG-powered vehicles requires the appropriate selection of material and the technology of its application. Commercially used valve seat materials show accelerated wear under operating conditions, especially in natural gas vehicle engines. The authors developed a new material concept and a new technological concept for the protection of the valve seat in CNG/LNG-powered vehicles. This article aims to present the first stage of tribological research. Two materials were used in the research: Stellite 6 alloy and Fe3Al intermetal. A commonly used material for valve seats of combustion engines is Stellite 6. The Fe3Al is the new proposed material coating for the protection of the valve seats of internal combustion engines. This article compares the abrasive wear resistance of these materials. The abrasion tests were performed on a T-11 pin-on-disc tester, and the counter-sample was steel S235JR. The test conditions were similar to those prevailing during the operation of the valves in the head of the internal combustion engine, without the influence of temperature. The obtained results indicate that the Fe3Al intermetal is characterized by a lower coefficient of friction and lower wear intensity than Stellite 6. The results confirm that the Fe3Al phase is a prospective material to be used as a protective material on the valve seat of vehicles.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47001586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

REAL-TIME EMISSIONS OF GASEOUS POLLUTANTS FROM VEHICLES UNDER HETEROGENEOUS TRAFFIC CONDITIONS 非均匀交通条件下车辆气体污染物的实时排放

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.5

Yuvraj Goyal, Sanu Meena, Suresh Kumar Singh, M. Kulshrestha

{"title":"REAL-TIME EMISSIONS OF GASEOUS POLLUTANTS FROM VEHICLES UNDER HETEROGENEOUS TRAFFIC CONDITIONS","authors":"Yuvraj Goyal, Sanu Meena, Suresh Kumar Singh, M. Kulshrestha","doi":"10.20858/sjsutst.2023.118.5","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.5","url":null,"abstract":"Air quality problems in cities are often a cause for worry. The air quality index is increasing daily, leading to an increase in cancer and many respiratory problems. Road transport in an urban area is a significant cause of air pollution. The vehicles must meet Indian emission regulations for which the emissions are measured using legally mandated standard driving cycles that did not accurately reflect real-world driving emissions because of varying traffic conditions, meteorological conditions, driving behaviour, vehicle power, performance, etc. This study focuses on real-time emissions of gaseous pollutants hydrocarbon (HC), carbon dioxide (CO2), carbon monoxide (CO), and nitric oxide (NO) from vehicle exhaust pipes under heterogeneous traffic conditions. The emissions were measured using a Portable Emission Measurement System (PEMS). The PEMS used was an AVL MDS 450 analyser mounted on the vehicle, and on-road emissions were captured. The test sample consists of four passenger vehicles with varying engine sizes, manufacturers, and fuel. The test route comprises city and highway areas, and it was discovered that the emissions were reduced by 40 to 70% on highways compared to the city. In petrol BSIV and BSVI engines, the emission was reduced to 41.73% for CO, 46.90% for HC, and 64% for NO in the city area. Speed and emissions scatter graphs were plotted for the vehicles, and it was found that in the city area, the optimum speed for less emission is between 30-40 km/h, and on highways, the optimum speed is 80-90 km/h. The emissions were also sensitive to the rate and frequency of acceleration and decelerations. This type of study is very limited in India, and more such studies are required for the assessment of air quality in metropolitan areas and successful traffic management strategies, as well as for determining instantaneous projections of pollutant emissions.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45283075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

OPERATIONAL PERFORMANCE ANALYSIS OF PUBLIC BUS TRANSPORT SERVICES IN ADDIS ABABA, ETHIOPIA 埃塞俄比亚亚的斯亚贝巴公交服务运营绩效分析

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.3

Mulugeta Girma

{"title":"OPERATIONAL PERFORMANCE ANALYSIS OF PUBLIC BUS TRANSPORT SERVICES IN ADDIS ABABA, ETHIOPIA","authors":"Mulugeta Girma","doi":"10.20858/sjsutst.2023.118.3","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.3","url":null,"abstract":"In emerging countries, improving performance in the transportation industry is a critical concern. Bus transport companies like Anbessa, Sheger and the Public Service Employees' Transport Service play a pivotal role in Addis Ababa's transit system. Subsequently, this study analyzes the operators' operational performance, comparing it to industry norms. The collected data is analyzed using the ratio analysis approach. The findings indicate that the Anbessa City Bus outperforms the other buses in several aspects, such as fleet strength, service utilization, and vehicle utilization, but there is a disparity in staff productivity and operational safety. Sheger City Bus, on the other hand, outperforms the market in terms of vehicle utilization, workforce productivity, and operational safety. However, on most of the indicators, the Public Employees Bus performs the worst. Finally, comparing the operators' performance to industry standards, most indications show that they fail to meet. Consequently, even if bus transit operators are subsidized by the government in the operation of their services for residents, the study suggests that they must make significant improvements in how they use their resources to improve their financial and operational performance and deliver better services compared to those provided by other operators in the city. In addition, government incentives such as subsidies should be allocated based on actual operational performance.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46640147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DETERMINATION OF THE QUALITY INDEX OF CARS 汽车质量指标的测定

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.2

Oleksiy Bazhinov, M. Kravtsov, T. Bazhynova, Yevhen Haiek, S. Kharchenko, Taras Shchur, K. Markowska, A. Sekala, Kinga Stecuła, T. Kawka, Ewa Siudyka

{"title":"DETERMINATION OF THE QUALITY INDEX OF CARS","authors":"Oleksiy Bazhinov, M. Kravtsov, T. Bazhynova, Yevhen Haiek, S. Kharchenko, Taras Shchur, K. Markowska, A. Sekala, Kinga Stecuła, T. Kawka, Ewa Siudyka","doi":"10.20858/sjsutst.2023.118.2","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.2","url":null,"abstract":"This article presents theoretical studies of methods for assessing car quality indicators in the operation stage. Important criteria for determining the quality indicators of cars during the operation phase are the following: functional stability, ecology, comfort, technical solutions, and traffic safety. The problem of converting a multicriteria quality assessment to a single criterion is proposed to be solved by the method of determining a quality index. The methodology for the practical and actual implementation of this research is based on the evaluation of the quality index established on the average vehicle speed then the basic methodological principles are formulated. The quality index of a car is significantly dependent on the operating conditions. This article presents the correction coefficients for the quality index of base, hybrid, and electric vehicles, depending on the operating conditions. The studies and the proposed car quality index provide timely information on the characteristics of operating conditions, creating the necessary conditions and opportunities for automakers to improve the design of cars, promote the image of car brands, and increase sales.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47991679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ANALYSIS OF POSSIBLE MODIFICATION OF TRANSPORT AIRCRAFT TO MEDEVAC IN THE CZECH REPUBLIC 对捷克共和国可能将运输机改装为医疗后送飞机的分析

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.8

J. Kozuba, J. Piľa, F. Martinec

{"title":"ANALYSIS OF POSSIBLE MODIFICATION OF TRANSPORT AIRCRAFT TO MEDEVAC IN THE CZECH REPUBLIC","authors":"J. Kozuba, J. Piľa, F. Martinec","doi":"10.20858/sjsutst.2023.118.8","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.8","url":null,"abstract":"With a growing number of coronavirus patients worldwide, military and civilian transport aircraft are increasingly being used for civilian medical evacuation duties (MEDEVAC) on time-critical flights. This article deals with the possibility of converting an aircraft fleet in the Czech Republic to MEDEVAC. The indication for the analysis of the possibility of transforming transport aircraft was the past and current pandemic situation in the Czech Republic. The main research question is how to implement the modification of a selected airline of the Czech Republic to MEDEVAC. An analysis of the technical data of selected aircraft from Airbus and Boeing was used to investigate this problem. Further, an analysis of the medical equipment required for the MEDEVAC aircraft category was also performed using equipment manufactured in the Czech Republic. The results obtained by the analysis and spatial arrangement of the aircraft deck for the transport of patients with medical equipment confirmed the possibility of such a transformation within the Czech Republic. We consider it important to elaborate on a project that would solve, in detail, all the steps of the conversion of a transport aircraft to MEDEVAC.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47262133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EXAMINATION OF DIFFERENT MODELS OF TROPOSPHERE DELAYS IN SBAS POSITIONING IN AERIAL NAVIGATION 航空导航中对流层延迟定位不同模式的检验

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.9

K. Krasuski, M. Kirschenstein

{"title":"EXAMINATION OF DIFFERENT MODELS OF TROPOSPHERE DELAYS IN SBAS POSITIONING IN AERIAL NAVIGATION","authors":"K. Krasuski, M. Kirschenstein","doi":"10.20858/sjsutst.2023.118.9","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.9","url":null,"abstract":"This paper presents the results of a study on the use of different tropospheric correction models in SBAS positioning for air navigation. The paper, in particular, determines the influence of the Saastamoinen troposphere and RTCA-MOPS models on the determination of aircraft coordinates and mean coordinate errors in the SBAS positioning method. The study uses real kinematic data from a GPS navigation system recorded by an onboard GNSS satellite receiver as well as SBAS corrections. In the experiment, the authors include SBAS corrections from EGNOS and SDCM augmentation systems. The navigation calculations were performed using RTKLIB v.2.4.3 and Scilab 6.1.1 software. Based on the conducted research, it was found that the difference in aircraft coordinates using different troposphere models can reach up to ±2.14 m. Furthermore, the use of the RTCA-MOPS troposphere model improved the values of mean coordinate errors from 5 to 9% for the GPS+EGNOS solution and from 7 to 12% for the GPS+SDCM solution, respectively. The obtained computational findings confirm the validity of using the RTCA-MOPS troposphere model for SBAS positioning in aerial navigation.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42369558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AN APPROACH TO RELIABILITY ANALYSIS OF AIRCRAFT SYSTEMS FOR A SMALL DATASET 基于小数据集的飞机系统可靠性分析方法

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.14.

Onyedikachi Chioma Okoro, M. Zaliskyi, Dmytriiev Serhii, Ibinabo Abule

引用次数: 0

NOVEL ACCESSIBILITY METRICS BASED ON HIERARCHICAL DECOMPOSITION OF TRANSPORT NETWORKS 一种新的基于传输网络层次分解的可达性度量

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.10

Divya Kwatra, K. Rao, Vasudha Bhatnagar

{"title":"NOVEL ACCESSIBILITY METRICS BASED ON HIERARCHICAL DECOMPOSITION OF TRANSPORT NETWORKS","authors":"Divya Kwatra, K. Rao, Vasudha Bhatnagar","doi":"10.20858/sjsutst.2023.118.10","DOIUrl":"https://doi.org/10.20858/sjsutst.2023.118.10","url":null,"abstract":"Scientific analysis of public transport systems at the urban, regional, and national levels is vital in this contemporary, highly connected world. Quantifying the accessibility of nodes (locations) in a transport network is considered a holistic measure of transportation and land use and an important research area. In recent years, complex networks have been employed for modeling and analyzing the topology of transport systems and services networks. However, the design of network hierarchy-based accessibility measures has not been fully explored in transport research. Thus, we propose a set of three novel accessibility metrics based on the k-core decomposition of the transport network. Core-based accessibility metrics leverage the network topology by eliciting the hierarchy while accommodating variations like travel cost, travel time, distance, and frequency of service as edge weights. The proposed metrics quantify the accessibility of nodes at different geographical scales, ranging from local to global. We use these metrics to compute the accessibility of geographical locations connected by air transport services in India. Finally, we show that the measures are responsive to changes in the topology of the transport network by analyzing the changes in accessibility for the domestic air services network for both pre-covid and post-covid times.","PeriodicalId":43740,"journal":{"name":"Scientific Journal of Silesian University of Technology-Series Transport","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46174484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DEVELOPMENT MEASURES TO ENHANCE THE ECOLOGICAL SAFETY OF SHIPS AND REDUCE OPERATIONAL POLLUTION TO THE ENVIRONMENT 加强船舶生态安全，减少作业对环境污染的发展措施

IF 0.6

Scientific Journal of Silesian University of Technology-Series Transport Pub Date : 2023-03-01 DOI: 10.20858/sjsutst.2023.118.13

O. Melnyk, S. Onyshchenko, O.А. Onishchenko

引用次数: 1