Acta Polytechnica最新文献_第2页

Effect of cross-sections data on calculated static neutronic parameters of PWR MOX/UO2 core transient benchmark case using NODAL3 code 利用NODAL3代码计算截面数据对压水堆MOX/UO2堆芯瞬态基准工况计算静态中子参数的影响

Acta Polytechnica Pub Date : 2023-09-05 DOI: 10.14311/ap.2023.63.0242

Wahid Luthfi, Surian Pinem

{"title":"Effect of cross-sections data on calculated static neutronic parameters of PWR MOX/UO2 core transient benchmark case using NODAL3 code","authors":"Wahid Luthfi, Surian Pinem","doi":"10.14311/ap.2023.63.0242","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0242","url":null,"abstract":"This paper describes the effect of cross-section data generated by several codes on calculated neutronic parameters. The Pressurized Water Reactor Mixed Oxide and Uranium Oxide (PWR MOX/UO2) Core Transient Benchmark case was chosen because it has been used widely to validate neutronic codes. The cross-section data in this study will be generated by SRAC, Serpent, and HELIOS codes. The NODAL3 code will be used to calculate neutronic parameters from each cross-section. The neutronic parameters calculated by NODAL3 are the effective multiplication factor (keff), control rod worth, critical boron concentration, and power distribution under Hot Zero Power (HZP) conditions. The Power-Weighted Error (PWE) and Error-Weighted Error (EWE), as a measure of the relative error in fuel assembly power, are less than 5 %, indicating that the calculation is consistent with DeCART as a reference. The difference in calculated radial power peaking factor for all three cross-sections to reference data reaches 6.284 % (G-3), 8.438 % (G-3), and 10.998 % (C-7), respectively, for SRAC, Serpent, and HELIOS. The axial power distribution calculated by NODAL3 at the top and bottom of the reactor core has a relative error that peaked at 16.60 %, 13.86 %, and 10.20 %, respectively, for cross-sections provided by SRAC, Serpent, and HELIOS. Further improvements are needed for NODAL3 by applying various discontinuity factors to improve its performance.","PeriodicalId":45804,"journal":{"name":"Acta Polytechnica","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135362144","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

3D CFD model for the analysis of the flow field through a horizontal axis wind turbine (HAWT) 水平轴风力机流场分析的三维CFD模型

Acta Polytechnica Pub Date : 2023-09-05 DOI: 10.14311/ap.2023.63.0250

Noureddine Menasri, Said Zergane, Noureddine Aimeur, Aissa Amour

引用次数: 0

Compression behaviour and failure mechanisms of a safety culvert made of hollow high-performance concrete blocks 高性能空心混凝土砌块安全涵洞受压特性及破坏机理

Acta Polytechnica Pub Date : 2023-09-05 DOI: 10.14311/ap.2023.63.0227

Petr Hála, Filip Šmejkal, Radoslav Sovják

引用次数: 0

Evaluation of Natural Radioactivity and Associated Radiological Risks of Farmland Soil: A Study of a Campus Farmland of Osun State University, Nigeria 农田土壤天然放射性及相关辐射风险评价——以尼日利亚奥孙州立大学校园农田为例

IF 0.8

Acta Polytechnica Pub Date : 2023-07-13 DOI: 10.1007/s41050-023-00043-x

O. F. Oladejo, S. F. Olukotun, S. T. Gbenu, L. T. Ogundele, S. O. Inuyomi, M. A. Fakunle

引用次数: 0

Forest Digital Twin: A Digital Transformation Approach for Monitoring Greenhouse Gas Emissions 森林数字孪生:监测温室气体排放的数字化转型方法

IF 0.8

Acta Polytechnica Pub Date : 2023-07-05 DOI: 10.1007/s41050-023-00041-z

J. R. Silva, P. Artaxo, Elinilson Vital

引用次数: 0

Qualitative sign stability of linear time invariant descriptor systems 线性时不变广义系统的定性符号稳定性

IF 0.8

Acta Polytechnica Pub Date : 2023-07-04 DOI: 10.14311/ap.2023.63.0171

M. Chand, Mamoni Paitandi, M. Gupta

引用次数: 0

Mechanical and physical properties of cement mixtures for 3D processing 用于三维处理的水泥混合物的机械和物理性能

IF 0.8

Acta Polytechnica Pub Date : 2023-07-04 DOI: 10.14311/ap.2023.63.0199

J. Litoš, V. Šána, Adam Uhlík, K. Kolář, M. Nguyen

引用次数: 0

Neural network based patient recovery estimation of a PAM-based rehabilitation robot 基于神经网络的pam康复机器人患者康复估计

IF 0.8

Acta Polytechnica Pub Date : 2023-07-04 DOI: 10.14311/ap.2023.63.0179

Van-Vuong Dinh, Minh-Chien Trinh, Tien-Dat Bui, M. Duong, Q. Dao

引用次数: 0

A comparative experimental investigation of high-temperature effect on fibre concrete and high strength concrete using UT and CM methods UT法和CM法对纤维混凝土和高强混凝土高温效应的对比试验研究

IF 0.8

Acta Polytechnica Pub Date : 2023-07-04 DOI: 10.14311/ap.2023.63.0208

Javad Royaei, K. Sadeghi, Fatemeh Nouban

{"title":"A comparative experimental investigation of high-temperature effect on fibre concrete and high strength concrete using UT and CM methods","authors":"Javad Royaei, K. Sadeghi, Fatemeh Nouban","doi":"10.14311/ap.2023.63.0208","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0208","url":null,"abstract":"In this paper, a 28-day compressive strength test has been performed on samples including normal fibre concrete and high-strength concrete. The ultrasonic test (UT) as a non-destructive and compression machine (CM) as a destructive test were applied, and the results were compared. To investigate the effect of temperature, the samples were subjected to 200, 400, 600, 800, 1000, and 1200 degrees Celsius and the exposure time was equal to 30, 45, 60, 90, 120, and 180 minutes. Based on the results, it was observed that the minimum error observed between the UT and CM tests was 2.9 % and the maximum error between the two methods was 10.9 %, which shows the high accuracy of the ultrasonic testing method in determining the specimen’s strength. The average probable error of the method is determined to be around 6.8 %.Based on the results of the average decrease in compressive strength versus the heat exposure time, it is observed that the trend of changes and decrease in resistance over time for both types of tests is almost the same and has a negligible difference. At the end of 180 minutes of exposure, the resistance ratio for the ultrasonic test is 69.8 %, and 71.1 % for the compression machine. Furthermore, according to the average reduction in compressive strength due to heat exposure time, it has been observed that the results of the UT and UM tests have slight numerical differences, however, the trend of changes and reduction in resistance over time for both types of tests is almost the same. Finally, the accuracy of the UT in determining the compressive strength of specimens at high temperatures is fully confirmed.","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":"48952076","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

Fractional multi-loop active disturbance rejection control for a lower knee exoskeleton system 膝关节外骨骼系统的分数阶多回路自抗扰控制

IF 0.8

Acta Polytechnica Pub Date : 2023-07-04 DOI: 10.14311/ap.2023.63.0158

N. A. Al-awad, A. Humaidi, A. Al-Araji

{"title":"Fractional multi-loop active disturbance rejection control for a lower knee exoskeleton system","authors":"N. A. Al-awad, A. Humaidi, A. Al-Araji","doi":"10.14311/ap.2023.63.0158","DOIUrl":"https://doi.org/10.14311/ap.2023.63.0158","url":null,"abstract":"Rehabilitation Exoskeleton is becoming more and more important in physiotherapists’ routine work. To improve the treatment performance, such as reducing the recovery period and/or monitoring and reacting to unpredictable situations, the rehabilitation manipulators need to help the patients in various physical trainings. A special case of the active disturbance rejection control (ADRC) is applied to govern a proper realisation of basic limb rehabilitation trainings. The experimental study is performed on a model of a flexible joint manipulator, whose behaviour resembles a real exoskeleton rehabilitation device (a one-degree-of-freedom, rigid-link, flexible-joint manipulator). The fractional (FADRC) is an unconventional model-independent approach, acknowledged as an effective controller in the existence of total plant uncertainties, and these uncertainties are inclusive of the total disturbances and unknown dynamics of the plant. In this work, three FADRC schemes are used, the first one using a fractional state observer (FSO), or FADRC1, second one using a fractional proportional-derivative controller (FPD), or FADRC2, and the third one a Multi-loop fractional in PD-loop controller and the observer-loop (Feedforward and Feedback), or FADRC3. The simulated Exoskeleton system is subjected to a noise disturbance and the FADRC3 shows the effectiveness to compensate all these effects and satisfies the desired position when compared with FADRC1 and FADRC2. The design and simulation were carried out in MATLAB/Simulink.","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":"47228102","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