Periodica Polytechnica Transportation Engineering最新文献_第3页

Impact of Ambient Temperature, Passenger Load, and Delay on the Consumption of Battery Electric Buses 环境温度、乘客负荷和延迟对电池电动巴士消耗量的影响

Periodica Polytechnica Transportation Engineering Pub Date : 2024-02-07 DOI: 10.3311/pptr.23478

P. Szilassy, Dávid Földes

{"title":"Impact of Ambient Temperature, Passenger Load, and Delay on the Consumption of Battery Electric Buses","authors":"P. Szilassy, Dávid Földes","doi":"10.3311/pptr.23478","DOIUrl":"https://doi.org/10.3311/pptr.23478","url":null,"abstract":"The operation of state-of-the-art battery electric buses (BEBs) has started recently, and their consumption model is unknown. Therefore, the service providers are lenient regarding the energy used. Our aim was to reveal the effects of ambient temperature and bus service characteristics, such as passenger load and delay, on the energy consumption. Real-time consumption data of BEBs were analyzed in Nyíregyháza, Hungary, and the functional relationships among the aforementioned variables were revealed. We found that while ambient temperature is negatively correlated with consumption in the cold winter periods, the consumption surplus is positively correlated with passenger load and generally positively correlated with the delay on the trip because of road traffic. In the case of delay, the consumption increase is caused by more frequent acceleration and the greater consumption of auxiliary systems due to longer running times. Accordingly, the energy consumption can be estimated if the characteristics data are available. The results can be used by bus service operators to plan the daily schedule and predict the energy consumption of a BEB.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139796101","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

Impact of Ambient Temperature, Passenger Load, and Delay on the Consumption of Battery Electric Buses 环境温度、乘客负荷和延迟对电池电动巴士消耗量的影响

Periodica Polytechnica Transportation Engineering Pub Date : 2024-02-07 DOI: 10.3311/pptr.23478

P. Szilassy, Dávid Földes

{"title":"Impact of Ambient Temperature, Passenger Load, and Delay on the Consumption of Battery Electric Buses","authors":"P. Szilassy, Dávid Földes","doi":"10.3311/pptr.23478","DOIUrl":"https://doi.org/10.3311/pptr.23478","url":null,"abstract":"The operation of state-of-the-art battery electric buses (BEBs) has started recently, and their consumption model is unknown. Therefore, the service providers are lenient regarding the energy used. Our aim was to reveal the effects of ambient temperature and bus service characteristics, such as passenger load and delay, on the energy consumption. Real-time consumption data of BEBs were analyzed in Nyíregyháza, Hungary, and the functional relationships among the aforementioned variables were revealed. We found that while ambient temperature is negatively correlated with consumption in the cold winter periods, the consumption surplus is positively correlated with passenger load and generally positively correlated with the delay on the trip because of road traffic. In the case of delay, the consumption increase is caused by more frequent acceleration and the greater consumption of auxiliary systems due to longer running times. Accordingly, the energy consumption can be estimated if the characteristics data are available. The results can be used by bus service operators to plan the daily schedule and predict the energy consumption of a BEB.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"27 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139855778","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

A Genetic Algorithm-based Decision Framework to Incorporate Climate Impact on Pavement Maintenance Planning 基于遗传算法的决策框架，将气候影响纳入路面养护规划

Periodica Polytechnica Transportation Engineering Pub Date : 2024-02-02 DOI: 10.3311/pptr.22290

Sachini Madushani, Kelum Sandamal, Tharindu Rangajeewa

{"title":"A Genetic Algorithm-based Decision Framework to Incorporate Climate Impact on Pavement Maintenance Planning","authors":"Sachini Madushani, Kelum Sandamal, Tharindu Rangajeewa","doi":"10.3311/pptr.22290","DOIUrl":"https://doi.org/10.3311/pptr.22290","url":null,"abstract":"A recent trend of increase in the vulnerable behavior of roads to potential climate events is observed worldwide. However, a few studies conducted incorporate climate impact into road maintenance and rehabilitation. To address this, a genetic algorithm (GA) based optimization approach is proposed in this study with a climate risk index (CRI) in terms of criticality of roads, probability of occurrence of a climate event, and existing severity level of pavement. Criticality is defined by road functional class, availability of alternative routes and land use. Probability is determined by historical events and topography, while severity is defined by existing pavement condition. The CRI is incorporated as a generic constraint to the GA-based optimization model to maximize the average network condition under a given budget. To demonstrate this, a case study is conducted using twenty roads in different climatic conditions in Sri Lanka. The results show that in 25% and 50% of required total budget conditions there is a clear separation between priority roads IRI and non-priority roads IRI due to the generic constraint. This is an indication that the optimization model effectively prioritizes roads when there is a budget constraint. This concludes that the proposed approach can be utilized to make the most of the available budget for road maintenance by prioritizing roads that are highly vulnerable to climate events without compromising the overall network condition. Further, the proposed maintenance optimization approach can be extended to long term maintenance planning economically for developing countries.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"77 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139810807","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

A Genetic Algorithm-based Decision Framework to Incorporate Climate Impact on Pavement Maintenance Planning 基于遗传算法的决策框架，将气候影响纳入路面养护规划

Periodica Polytechnica Transportation Engineering Pub Date : 2024-02-02 DOI: 10.3311/pptr.22290

Sachini Madushani, Kelum Sandamal, Tharindu Rangajeewa

{"title":"A Genetic Algorithm-based Decision Framework to Incorporate Climate Impact on Pavement Maintenance Planning","authors":"Sachini Madushani, Kelum Sandamal, Tharindu Rangajeewa","doi":"10.3311/pptr.22290","DOIUrl":"https://doi.org/10.3311/pptr.22290","url":null,"abstract":"A recent trend of increase in the vulnerable behavior of roads to potential climate events is observed worldwide. However, a few studies conducted incorporate climate impact into road maintenance and rehabilitation. To address this, a genetic algorithm (GA) based optimization approach is proposed in this study with a climate risk index (CRI) in terms of criticality of roads, probability of occurrence of a climate event, and existing severity level of pavement. Criticality is defined by road functional class, availability of alternative routes and land use. Probability is determined by historical events and topography, while severity is defined by existing pavement condition. The CRI is incorporated as a generic constraint to the GA-based optimization model to maximize the average network condition under a given budget. To demonstrate this, a case study is conducted using twenty roads in different climatic conditions in Sri Lanka. The results show that in 25% and 50% of required total budget conditions there is a clear separation between priority roads IRI and non-priority roads IRI due to the generic constraint. This is an indication that the optimization model effectively prioritizes roads when there is a budget constraint. This concludes that the proposed approach can be utilized to make the most of the available budget for road maintenance by prioritizing roads that are highly vulnerable to climate events without compromising the overall network condition. Further, the proposed maintenance optimization approach can be extended to long term maintenance planning economically for developing countries.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139870687","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

Friction and Wear of the Piston Ring – Cylinder Liner System with Artificially Aged Ultra-low Viscosity Engine Oils 活塞环 - 缸套系统与人工陈化超低粘度发动机油的摩擦和磨损

Periodica Polytechnica Transportation Engineering Pub Date : 2024-01-09 DOI: 10.3311/pptr.22918

András Lajos Nagy

{"title":"Friction and Wear of the Piston Ring – Cylinder Liner System with Artificially Aged Ultra-low Viscosity Engine Oils","authors":"András Lajos Nagy","doi":"10.3311/pptr.22918","DOIUrl":"https://doi.org/10.3311/pptr.22918","url":null,"abstract":"This study aims to investigate the performance of artificially aged prototype engine oils through friction and wear experiments. Experiments were performed on a piston ring – cylinder liner model system with boundary conditions derived from real-life operating conditions. The experimental design implemented two prototype oils (SAE 0W-12 and 0W-16) in unaltered and artificially aged form. An additional fully formulated off-the-shelf engine oil (SAE 0W-20) was also aged and analyzed as reference. Oil samples were artificially aged in a custom rig, to simulate long-term in-engine use through thermal cycling at 180 °C. Fourier Transformed Infrared Spectroscopy of the lubricant samples highlighted a depletion of zinc dialkyl-ditiophosphate antiwear additives in all cases, which is comparable to a selected in-service oil. Oxidation was also measurable, albeit lower compared to the in-service sample. Averaged friction coefficients showed a ranking of aged 0W-12 < aged 0W-16 < unaltered 0W-12 < unaltered 0W-16. A decrease in surface roughness was experienced with aged oil samples, whereas unaltered 0W-16 oil produced an unexpected transition in the wear phenomenon and resulted in severe wear.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"29 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443266","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

Environmental Impact of Freight Transport – Freight Footprint as a New Freight Transport Indicator 货运对环境的影响--作为货运新指标的货运足迹

Periodica Polytechnica Transportation Engineering Pub Date : 2023-12-11 DOI: 10.3311/pptr.23215

Adrienn Boldizsár

引用次数: 0

Development of Composite Pedestrian Level of Service Model in Urban Milieu at Midblock Sections 开发城市街区中段行人服务水平综合模型

Periodica Polytechnica Transportation Engineering Pub Date : 2023-12-11 DOI: 10.3311/pptr.20798

Jayasree Kuchu

{"title":"Development of Composite Pedestrian Level of Service Model in Urban Milieu at Midblock Sections","authors":"Jayasree Kuchu","doi":"10.3311/pptr.20798","DOIUrl":"https://doi.org/10.3311/pptr.20798","url":null,"abstract":"The pedestrian mode is gaining recognition as a basic building block in urban system design. Increasing attention is being given to developing vehicle-free zones to reduce urban pollution and return the inner city to its former role as a place for personal interaction. Attempts are being made to improve the walking experience, to make it more safe, convenient, and attractive especially in urban milieu to promote sustainable development. To provide the best pedestrian environment, it is necessary to understand pedestrian level of service. Conventional techniques of LOS determination consider the basic mobility characteristics of the pedestrian. The objective of this study is to develop a more accurate method of estimating level of service of pedestrians by developing composite indicators that integrate both qualitative and quantitative factors affecting both pedestrian and roadway conditions in the pedestrian movement. The relative importance of these multifaceted factors is assessed using Saaty scale and an Analytic Hierarchy Process is applied to determine the level of service. Field investigations include road network characterization and inventory studies, vehicular / pedestrian traffic characterization studies, pedestrian opinion surveys, expert opinion surveys. The approach has been applied to a major arterial road in Hyderabad city, Telangana, India in Mehdipatnam zone where pedestrian interactions are relatively high due to the commercial activity along the corridors. The stretches considered in the study exhibited Level of service \"B\" and \"C\" which implied necessary improvements to promote a good level of service.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"19 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138981093","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

Comparison of Different Turbulence Models and Wall Treatment Methods for Vehicle Aerodynamics Investigations 车辆空气动力学研究中不同湍流模型和壁面处理方法的比较

Periodica Polytechnica Transportation Engineering Pub Date : 2023-12-11 DOI: 10.3311/pptr.22671

Brúnó Péter, István Lakatos

{"title":"Comparison of Different Turbulence Models and Wall Treatment Methods for Vehicle Aerodynamics Investigations","authors":"Brúnó Péter, István Lakatos","doi":"10.3311/pptr.22671","DOIUrl":"https://doi.org/10.3311/pptr.22671","url":null,"abstract":"In this paper two different turbulence models and wall treatment methods were investigated with Computational Fluid Dynamics (CFD) method. The used geometry for the research was the Ahmed body. The Ahmed body is a widely used geometry in vehicle aerodynamics investigations. The geometry represents a simplified vehicle, which allows the researchers to make examinations with moderate resources. The simulations were made in Ansys Fluent. The environment of the simulation was built to optimize for maximum 8 GB RAM. The paper examines the difference between the k-ω SST and the k-ε turbulence models in the case of low and high Reynolds number wall treatment methods. This could be useful because the high Reynolds number wall treatment method needs less computational capacity based on that, its required y+ range is between 30 and 300. While in the case of the low Reynolds wall treatment method the required y+ range is below 10, which could increase the cell count. The results from the CFD simulation will be compared to each other and with measured data. The aim of the research is to get information about behaviour of the examined turbulence models in the case of low and high Reynolds number wall treatment methods.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"13 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138980269","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

Exploratory Study for the Development of Road Safety Index on Indian Roads 制定印度道路安全指数的探索性研究

Periodica Polytechnica Transportation Engineering Pub Date : 2023-11-29 DOI: 10.3311/pptr.22606

Electricwala Fatima, L. Gupta, Rakesh Kumar

{"title":"Exploratory Study for the Development of Road Safety Index on Indian Roads","authors":"Electricwala Fatima, L. Gupta, Rakesh Kumar","doi":"10.3311/pptr.22606","DOIUrl":"https://doi.org/10.3311/pptr.22606","url":null,"abstract":"Road Safety has always been a factor of great concern in India as well as across the world. Road Traffic Accidents have been consistently increasing, and to address this issue, the world's governments declared 2021 to 2030 as the 'Decade of Action' for Road Safety. This rise in accidents can be attributed to the increasing motorization escalation, increasing individual modes of transport, soaring speeds, drinking and driving, increasing transportation network patterns and inefficient enforcement, to name a few. If compendiously scrutinized, the losses due to road traffic incidences are wholly avoidable. A comprehensive study was thus conducted to identify the key aspects which can be attributed to road safety. The six key factors were identified, namely the design of roads, the design of vehicles, the role of the law enforcement agency, the part of the Indian judicial system, the function of the Indian medical system, and general public awareness for developing road safety index. Primary data collection among various population segments identified the relative importance of these factors. The weightage based on the importance of these factors was computed using the Logarithmic Goal Programming Model, and thus, the Road Safety Index was developed.","PeriodicalId":39536,"journal":{"name":"Periodica Polytechnica Transportation Engineering","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139210503","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 Estimate of the Number of Accidents and Serious Accidents in Railway Traffic 铁路交通事故和严重事故数量估计

Periodica Polytechnica Transportation Engineering Pub Date : 2023-11-29 DOI: 10.3311/pptr.21753

D. Pupavac, Anton Marinac, Josip Knežević

引用次数: 0