Sādhanā最新文献_第10页

Comparative analysis of modulation schemes for multilevel half-bridge bidirectional DC–DC converter in microgrid applications 微电网应用中多级半桥双向 DC-DC 转换器调制方案的比较分析

Sādhanā Pub Date : 2024-05-09 DOI: 10.1007/s12046-024-02484-1

S SOFIYA, K M MUHAMMED SHAFY, SHELAS SATHYAN

{"title":"Comparative analysis of modulation schemes for multilevel half-bridge bidirectional DC–DC converter in microgrid applications","authors":"S SOFIYA, K M MUHAMMED SHAFY, SHELAS SATHYAN","doi":"10.1007/s12046-024-02484-1","DOIUrl":"https://doi.org/10.1007/s12046-024-02484-1","url":null,"abstract":"This paper analyses the performance of multilevel half-bridge bidirectional DC–DC converter (MHBDC) under wide change in voltage transformation ratio. The advantage of MHBDC topology over conventional isolated bi-directional dc–dc converter (CIBDC) includes reduced voltage stress across the semiconductor switches and the transformer windings, which is suitable for high voltage applications in DC microgrids. Microgrids is inclined to voltage variations at both input and output side, which direct towards increased current stress in MHBDC. The rise in current stress can be minimized by employing various phase shift modulation techniques. The paper presents steady state time domain analysis of MHBDC under conventional phase shift modulation (CPSM), extended phase shift modulation (EPSM) and dual phase shift modulation (DPSM). A computational procedure is developed and demonstrated to obtain the phase shift angles at minimum value of current stress and varying voltage transformation ratio in the converter. Current stress analysis, soft switching region of operation and reverse power flow analysis in MHBDC are examined under different modulation schemes. A 1.5 kW hardware prototype of MHBDC is built, evaluated and presented the results. Power loss analysis and efficiency plots for the converter is determined and quantitatively evaluated with different modulation techniques considering high, medium and low power ranges.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140936260","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

Sustainable base isolation: a review of techniques, implementation, and extreme events 可持续基地隔离：技术、实施和极端事件回顾

Sādhanā Pub Date : 2024-05-09 DOI: 10.1007/s12046-024-02511-1

Dhirendra Patel, Gaurav Pandey, Vishal Kumar Mourya, Rajesh Kumar

{"title":"Sustainable base isolation: a review of techniques, implementation, and extreme events","authors":"Dhirendra Patel, Gaurav Pandey, Vishal Kumar Mourya, Rajesh Kumar","doi":"10.1007/s12046-024-02511-1","DOIUrl":"https://doi.org/10.1007/s12046-024-02511-1","url":null,"abstract":"Growing concerns about seismic events enforced structural engineers and architects to embrace the hazardous effect of ground motion in design. To address this, researchers have developed various base isolation (BI) techniques. This study comprehensively reviews BI system types, techniques, and implementation. Exploring the dynamic response of three-dimensional BI devices and the mutual effects of isolation devices and soil-structure interaction during strong ground motion, the paper covers topics such as seismic isolation of nuclear power plants, cost analysis, and various optimization techniques. Furthermore, the paper investigates the behavior of isolation devices in beyond-design events, including blast and aircraft impact loading. In general, the seismic isolation and control device response is demonstrated through shaking table tests and computational analysis. The study sheds light on the functions of seismic isolation system by comparing them with fixed base structures. Additionally, the paper presents codal recommendations, recent advancements, and current practices, aligning them with historical developments and past reviews of different BI techniques, along with their advantages and disadvantages. In conclusion, the closing remarks emphasize the future research prospects in this field.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140941866","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

Peripheral air jet injection at part load operation of a low head Francis turbine 低水头混流式水轮机部分负荷运行时的外围空气喷射

Sādhanā Pub Date : 2024-05-09 DOI: 10.1007/s12046-024-02524-w

SANDEEP KUMAR, BHUPENDRA K GANDHI

引用次数: 0

Risk assessment of shield tunnel collapse accident based on fuzzy analytic hierarchy process 基于模糊层次分析法的盾构隧道坍塌事故风险评估

Sādhanā Pub Date : 2024-05-09 DOI: 10.1007/s12046-024-02487-y

Jun Yang, Linke Qiao, Changjiang Li, Xu Chang, Xing Wu

{"title":"Risk assessment of shield tunnel collapse accident based on fuzzy analytic hierarchy process","authors":"Jun Yang, Linke Qiao, Changjiang Li, Xu Chang, Xing Wu","doi":"10.1007/s12046-024-02487-y","DOIUrl":"https://doi.org/10.1007/s12046-024-02487-y","url":null,"abstract":"The collapse of shield tunnel seriously endangers the safety of urban subway construction and causes adverse social impact. In order to quantitatively evaluate the collapse risk of shield tunnel and ensure the normal construction of shield tunnel, the risk assessment model of shield tunnel collapse is established based on fuzzy theory and analytic hierarchy process. Taking the collapse risk assessment of the tunnel from Dahongmen South Station to Heyi Station of Beijing Metro Line 8 as an example, 4 first level indicators and 12 second level indicators are selected to define a fuzzy evaluation system. The weight set of evaluation factors is derived according to the hierarchy. According to the average membership degree of each index, the risk degree is calculated by fuzzy operator and the evaluation vector is obtained by applying the principle of multifactor fuzzy relation synthesis. The comparative analysis shows that the on-site monitoring results are very consistent with the lowrisk value obtained from the fuzzy evaluation, which proves that grouting reinforcement is the most effective method to prevent tunnel collapse. The engineering practice has verified the scientificity and rationality of this method, which gives full play to the advantages from qualitative to quantitative, and has high accuracy and universal applicability.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140936155","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

Numerical modelling of dropwise condensation of water vapor from humid air using point sink superposition method 利用点汇叠加法建立湿空气中水汽滴状凝结的数值模型

Sādhanā Pub Date : 2024-05-05 DOI: 10.1007/s12046-024-02478-z

Tridibesh Chattoraj, Avishek Chatterjee, Tibin M Thomas, Pallab Sinha Mahapatra, Achintya Mukhopadhyay

引用次数: 0

MRAC based intelligent PID controller design technique for a class of dynamical systems 基于 MRAC 的一类动力系统智能 PID 控制器设计技术

Sādhanā Pub Date : 2024-05-05 DOI: 10.1007/s12046-024-02457-4

Santanu Mallick, Ujjwal Mondal

{"title":"MRAC based intelligent PID controller design technique for a class of dynamical systems","authors":"Santanu Mallick, Ujjwal Mondal","doi":"10.1007/s12046-024-02457-4","DOIUrl":"https://doi.org/10.1007/s12046-024-02457-4","url":null,"abstract":"Model-Free Control (MFC) is used to control a complex system by designing a simple representation of the system, known as ultralocal model. This MFC continuously updates the input-output behavior with the help of ultralocal model. The combination of MFC with standard Proportional Integral Derivative (PID) controller develops Intelligent Proportional Integral Derivative (i-PID) controller. The i-PID controller is basically a class of robust control technique in the field of PID controller. In this methodology, the tuning is quite straightforward for extremely nonlinear and/or time varying plants, without consideration of any modeling procedure. In Model Reference Adaptive Controller (MRAC)-PID controller principle, PID parameters are updated/tuned in accordance with control technique based on MRAC-Massachusetts Institute of Technology (MIT) rule, such that the plant is efficient to follow the reference model. The main objective of this paper is to implement MRAC based Intelligent PID controller for a class of dynamical systems using Model-Free Control technique, where the prior knowledge about the system dynamic is not essential and moreover complex parameter tuning is not necessary.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888867","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

Experimental analysis on the influence of cathode current-collector open ratio on the performance of an air breathing direct methanol fuel cell (AB-DMFC) with the addition of alkali solution 添加碱溶液的空气呼吸直接甲醇燃料电池（AB-DMFC）阴极电流-集电极开度比对其性能影响的实验分析

Sādhanā Pub Date : 2024-05-05 DOI: 10.1007/s12046-024-02477-0

Ramesh Manupati, G Naga Srinivasulu

{"title":"Experimental analysis on the influence of cathode current-collector open ratio on the performance of an air breathing direct methanol fuel cell (AB-DMFC) with the addition of alkali solution","authors":"Ramesh Manupati, G Naga Srinivasulu","doi":"10.1007/s12046-024-02477-0","DOIUrl":"https://doi.org/10.1007/s12046-024-02477-0","url":null,"abstract":"Research efforts have been centred on creating potential methods for producing green energy. A viable choice in this regard is fuel cells. Air breathing direct methanol fuel cell (AB-DMFC) is one of the many types of fuel cells, that is becoming increasing popular as a source of electricity for recharging portable electronic devices. The current study examined AB-DMFC performance equipped with various open ratio (OR)’s of cathode current collector (CC) such as 38.5%, 45.4%, and 55.4%. The cathode CC in an AB-DMFC is extremely vital to the operation of the fuel cell since it collects electrons, promotes oxygen flow for the cathode reaction and removes water bubbles produced at the cathode side, among other critical functions. For each open ratio of CC, the anodic fuel is supplied by external components like pumps with a concentration range of 1 M to 4 M methanol. When compared to other two open ratios, the experimental findings demonstrated that CC with a 45.4% OR at 2M of methanol concentration generated maximum power density (MPD) of 7.75 mW/cm2. The next stage of experiments continued with the addition of alkali solution (NaOH) to methanol fuel, and it was found that adding alkali solution to methanol fuel enhanced the MPD of 8.5 mW/cm2 and decreased methanol cross over compared with conventional AB-DMFC.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888770","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

GAN4IP: A unified GAN and logic locking-based pipeline for hardware IP security GAN4IP：用于硬件 IP 安全的基于 GAN 和逻辑锁的统一流水线

Sādhanā Pub Date : 2024-05-05 DOI: 10.1007/s12046-024-02461-8

Jugal Gandhi, Diksha Shekhawat, M Santosh, Jai Gopal Pandey

引用次数: 0

Curvelet transform based myelin quantification from real time clinical data 基于曲线变换的实时临床数据髓鞘定量分析

Sādhanā Pub Date : 2024-05-05 DOI: 10.1007/s12046-024-02469-0

Jemila S Jacily, Therese A Brintha

{"title":"Curvelet transform based myelin quantification from real time clinical data","authors":"Jemila S Jacily, Therese A Brintha","doi":"10.1007/s12046-024-02469-0","DOIUrl":"https://doi.org/10.1007/s12046-024-02469-0","url":null,"abstract":"Myelin segmentation from real-time conventional MRI is a useful and challenging task in the medical field. In this work, myelin is segmented from real-time T1-weighted MRI after the application of suitable pre-processing methods. Myelin quantification from conventional magnetic resonance imaging (MRI) such as T1-weighted MRI is an innovative and challenging task in the research field. In the literature, no effort is accessible to segment and quantify the myelin from conventional MRI. Working with clinical data is an immensely demanding task. It is impossible to segment and quantify myelin directly from clinical data. It was necessary to employ pre-processing procedures before segmentation. In this task, Curvelet transform based adaptive Gaussian notch filtering with dynamic stretching is used before segmentation. Different image enhancement methods are compared, When compared to other image enhancement methods if we apply dynamic stretching then the segmented area is very nearer to the values calculated by the radiologists. The segmentation accuracy and other metrics also high in this case. The area from segmented myelin is calculated and the values are compared to the values calculated by the radiologist. The values are nearer to manual calculation in the case of Curvelet transform based adative Gaussian notch filtering with dynamic stretching.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888866","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

Keyphrase extraction using graph-based statistical approach with NLP patterns 利用基于图的统计方法和 NLP 模式提取关键词

Sādhanā Pub Date : 2024-05-05 DOI: 10.1007/s12046-024-02494-z

Siddhesh Mehta, Rushikesh Karwa, Rahul Chavan, Vaibhav Khatavkar, Amit Joshi

{"title":"Keyphrase extraction using graph-based statistical approach with NLP patterns","authors":"Siddhesh Mehta, Rushikesh Karwa, Rahul Chavan, Vaibhav Khatavkar, Amit Joshi","doi":"10.1007/s12046-024-02494-z","DOIUrl":"https://doi.org/10.1007/s12046-024-02494-z","url":null,"abstract":"Extracting keyphrases plays a vital role in the field of natural language processing, that focuses on recognizing and retrieving significant phrases that summarize the essential information in a document. This research paper introduces a novel approach to extract keyphrases using a statistical approach based on graphs that incorporates degree centrality, TextRank, closeness, and betweenness measures and natural language processing patterns. This approach involves constructing a graph representation of the document and identifying the most important nodes in the graph and leveraging natural language processing patterns to enhance the accuracy and relevance of the extracted keyphrases. The proposed model is examined on a standard dataset for performance evaluation and its outcomes are evaluated by comparing them with the state-of-art methods for extracting keyphrases. The precision, recall, and F-measure achieved by the proposed model are 0.5263, 0.5498, and 0.5323, respectively which shows that proposed model outperforms existing models. The principal novelty of this methodology resides in the utilization of statistical techniques based on graphs and patterns of natural language processing, which enable the detection of the most pertinent nodes and keyphrases of utmost significance. The proposed approach is generalizable to a wide range of domains and text types, making it a promising approach for keyphrase extraction in various applications, including content analysis, document classification, and search engine optimization. In conclusion, the proposed approach offers a robust and scalable solution for identifying keyphrases that capture the essential information of a document. Future research can build upon this approach to improve the efficiency and effectiveness of automated text analysis.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140888769","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