Acta Polytechnica最新文献_第3页

Improvement of energy efficiency of a tram’s running gear 改进有轨电车运行装置的能源效率

IF 0.8

Acta Polytechnica Pub Date : 2023-07-04 DOI: 10.14311/ap.2023.63.0216

S. Semenov, E. Mikhailov, Sergii Kliuiev, J. Dižo, M. Blatnický, V. Ishchuk

{"title":"Improvement of energy efficiency of a tram’s running gear","authors":"S. Semenov, E. Mikhailov, Sergii Kliuiev, J. Dižo, M. Blatnický, V. Ishchuk","doi":"10.14311/ap.2023.63.0216","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0216","url":null,"abstract":"This research analyses the influence of some design features of an undercarriage of a tram on the energy efficiency in terms of mechanical energy losses during its operation. The work includes the comparison of results of the research from two main points of view, namely from a running gear design and a railway wheel design. Two variants of a tram’s bogie are investigated. A standard bogie and a bogie with a system that allows a radial adjustment of the wheelsets in curves. Two designs of a railway wheel are compared, a wheel with the traditional construction scheme and a wheel with a perspective construction scheme. The values of mechanical energy losses due to slippage in the contact between the wheels and rails are analysed. These losses are obtained with reference to a specific route and the value of the average power dissipated. Moreover, an analysis of advantages and disadvantages of bogie designs has made it possible to consider the most appropriate bogie design in terms of ensuring the energy efficiency. In this case, the bogie design with the wheels with the perspective construction scheme can be considered as the optimal option.","PeriodicalId":45804,"journal":{"name":"Acta Polytechnica","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43501375","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

Thermal Fatigue of Zircaloy-4 Cladded U-7.5Nb-2.5Zr 锆合金-4包覆U-7.5Nb-2.5Zr的热疲劳性能

IF 0.8

Acta Polytechnica Pub Date : 2023-06-21 DOI: 10.1007/s41050-023-00042-y

N. Morais, E. Monlevade, C. G. Schön

引用次数: 0

A Detailed Review on Wind and Solar Hybrid Green Energy Technologies for Sustainable Smart Cities 面向可持续智慧城市的风能和太阳能混合绿色能源技术综述

IF 0.8

Acta Polytechnica Pub Date : 2023-06-13 DOI: 10.1007/s41050-023-00040-0

E. Raj

引用次数: 0

Utilising Pareto efficiency and RSM to adjust binder content in clay stabilisation for Yttre Ringvägen, Malmö 利用帕累托效率和RSM调节Yttre粘土稳定中粘结剂含量Ringvägen, Malmö

IF 0.8

Acta Polytechnica Pub Date : 2023-05-02 DOI: 10.14311/ap.2023.63.0140

P. Lindh, Polina Lemenkova

引用次数: 2

Multidimensional mobile mapping and integrated approach for the digitalisation of underground transport infrastructure 地下交通基础设施数字化的多维移动测绘和综合方法

IF 0.8

Acta Polytechnica Pub Date : 2023-05-02 DOI: 10.14311/ap.2023.63.0111

F. Foria, Mario Calicchio, Laura Moretti, G. Loprencipe

{"title":"Multidimensional mobile mapping and integrated approach for the digitalisation of underground transport infrastructure","authors":"F. Foria, Mario Calicchio, Laura Moretti, G. Loprencipe","doi":"10.14311/ap.2023.63.0111","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0111","url":null,"abstract":"The tunnel industry has started focusing on the maintenance and management challenges of an existing infrastructure. It is an urgent matter in industrialised countries, where the stakeholders’ attention is increasing at a fast pace considering the incidents and the disruptions caused by improper monitoring and maintenance. This paper presents an innovative methodology to survey and inspect existing railway tunnels through multi-dimensional mobile mapping systems. The proposed approach belongs to the digital strategies for infrastructure maintenance. An integrated multidimensional survey system (ARCHITA) allows for collecting information necessary for the diagnostics of a structure with non-destructive tests. Linear cameras, thermographic cameras, and ground-penetrating radars acquire data to be digitalised and manipulated in different IT environments. The results, in terms of the collected data on structural defects, allow for a new approach for the Management and Identification of the Risk for Existing Tunnels (MIRET). The innovative approach aims at a smart integration of information and models for the Facility Management of the transport system. The workflow for the digitalisation and diagnosis from mobile mapping data has been implemented on two 40km-long metro tunnels.","PeriodicalId":45804,"journal":{"name":"Acta Polytechnica","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44665850","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

Remapping and simulation of EFI system for SI engine using piggyback ECU 搭载式ECU对汽油机电喷系统的改造与仿真

IF 0.8

Acta Polytechnica Pub Date : 2023-05-02 DOI: 10.14311/ap.2023.63.0089

Hau Than Diep, Gia Buu Nguyen, Barhm Mohamad

{"title":"Remapping and simulation of EFI system for SI engine using piggyback ECU","authors":"Hau Than Diep, Gia Buu Nguyen, Barhm Mohamad","doi":"10.14311/ap.2023.63.0089","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0089","url":null,"abstract":"Electronic fuel injection (EFI) is a complex system, many parts are connected together from mechanical parts to electronic parts to control the internal combustion engine. It must ensure many different works and the most important thing in motorsport to achieve is power optimization. High power and engine responsiveness are often desired to gain a competitive edge. Usually motorsport enthusiast will upgrade the car standard with aftermarket components such as higher rating turbo, longer duration camshafts and exhaust system. These are difficult to approach, time-consuming and expensive tasks compared to the ECU calibration method. And in Vietnam, most customers who want to change vehicle performance are based on the Remap method on Factory ECU. By using vehicle performance regulation method with piggy-back ECU, it is easier for the user to adjust than the popular Remap method. With advantages such as low cost and easy installation. And currently there are very few documents describing and evaluating the effectiveness of piggy-back ECU installed in vehicles. So in this paper, experimentally to reconstruct the electronic fuel injection system with piggy-back ECU was performed, then simulated the control algorithms of the electronic fuel injection system on LabVIEW and compared the results with the experiment, based on the simulation model of the operation algorithm of the EFI system with many cases in different load engines and engine speeds. Simulation results are used to evaluate the algorithm on the piggy-back ECU.","PeriodicalId":45804,"journal":{"name":"Acta Polytechnica","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44270678","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

Parametric optimisation of friction stir welding on aluminium alloy (EN AW-1100) plates 铝合金(EN AW-1100)板搅拌摩擦焊的参数优化

IF 0.8

Acta Polytechnica Pub Date : 2023-05-02 DOI: 10.14311/ap.2023.63.0075

Muhammad Umer Farooq Awan, Mahmood Khan, K. Waheed, Zafar Iqbal, A. Rehman, F. Ali, M. Shahzad, Muhammad Abdul Basit Saim, S. Akhtar, R. Aune

{"title":"Parametric optimisation of friction stir welding on aluminium alloy (EN AW-1100) plates","authors":"Muhammad Umer Farooq Awan, Mahmood Khan, K. Waheed, Zafar Iqbal, A. Rehman, F. Ali, M. Shahzad, Muhammad Abdul Basit Saim, S. Akhtar, R. Aune","doi":"10.14311/ap.2023.63.0075","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0075","url":null,"abstract":"Friction stir welding is a solid-state welding process used extensively for aluminium alloys. EN AW-1100 alloy is mostly used for its exceptional corrosion resistance, high ductility, high thermal and electrical conductivities, and cost-effectiveness. This study is focused on the optimisation of friction stir welding parameters to achieve enhanced mechanical properties of 5mm thick EN AW-1100 alloy plates welded with a single pass, using Taguchi L9 orthogonal array and ANOVA analysis. Experimental results revealed that maximum tensile strength of 79 MPa and percentage elongation of 38.87 % were achieved. The maximum Vickers hardness achieved in the stir zone was 34.15. These results were used for optimisation using Minitab and it was determined that 2000 RPM, 30 mm·min−1 traverse speed and square probe profile came out to be the best parameters for maximum tensile strength. 4000 RPM, 30 mm·min−1 traverse speed and square probe geometry were the best parameters for maximum hardness in the stir zone. ANOVA analysis showed that the most significant parameter for tensile strength was traverse speed. None of the considered parameters were influencing the hardness value in the stir zone at a 95 % confidence level.","PeriodicalId":45804,"journal":{"name":"Acta Polytechnica","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45595756","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

Derivation of entropy production in a fluid flow in a general curvilinear coordinate system 一般曲线坐标系下流体流熵产生的推导

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Acta Polytechnica Pub Date : 2023-05-02 DOI: 10.14311/ap.2023.63.0103

E. Flídr

引用次数: 0

Case study: Dosimetric comparison of VMAT, IMRT and 3DCRT techniques for left-sided breast cancer treated in deep inspiration breath-hold 案例研究:深度吸气屏气治疗左侧乳腺癌的VMAT、IMRT和3DCRT剂量学比较

IF 0.8

Acta Polytechnica Pub Date : 2023-05-02 DOI: 10.14311/ap.2023.63.0123

T. Hanušová

引用次数: 0

Estimation of stresses in a massive granite using laser ultra-sonic testing and stress memory effect 用激光超声测试和应力记忆效应估计花岗岩的应力

IF 0.8

Acta Polytechnica Pub Date : 2023-03-02 DOI: 10.14311/ap.2023.63.0011

O. Kašpar, A. Kravcov, J. Stoller, Petr Kubeček, Radovan Vnuk, Zbyněk Zušťák

{"title":"Estimation of stresses in a massive granite using laser ultra-sonic testing and stress memory effect","authors":"O. Kašpar, A. Kravcov, J. Stoller, Petr Kubeček, Radovan Vnuk, Zbyněk Zušťák","doi":"10.14311/ap.2023.63.0011","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0011","url":null,"abstract":"This paper addresses in-situ stress-estimation methods based on the Kaiser effect. The physical and mechanical properties of granite, diorite, and granodiorite samples selected at different depth intervals of the core obtained from a wellbore were examined. The ultimate uniaxial compressive strength, modulus of elasticity, and Poisson’s ratio of the rock samples were determined using presses and strain gauges. Also, local longitudinal and shear wave velocities were measured using a high-accuracy laser-ultrasonic system with a view to assessing the structure of the samples. Based on the resulting elastic wave velocity maps, samples with no obvious discontinuities were chosen. These undisturbed samples were subjected to uniaxial compression and their acoustic emission was simultaneously measured. In-situ stresses were estimated from the results of the interpretation of acoustic emission measurements. The experimental in-situ stresses were compared with the results of a numerical simulation. The ratio of the estimated in-situ stresses to the calculated ones is within the range from 0.81 to 1.11. This means that the laser ultrasonic and acoustic emission methods make it possible to effectively estimate in-situ stresses in a rock mass and assess the degree of rock mass damage.","PeriodicalId":45804,"journal":{"name":"Acta Polytechnica","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48377433","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