Sādhanā Pub Date : 2024-09-19 DOI: 10.1007/s12046-024-02602-z

Randeep Ravesh, Ayaj A Ansari, Sabyasachi Mohapatra, Pankaj Sharma, M K Das, P K Panigrahi

{"title":"Influence of non-stoichiometric solutions on the THF hydrate growth: chemical affinity modelling and visualization","authors":"Randeep Ravesh, Ayaj A Ansari, Sabyasachi Mohapatra, Pankaj Sharma, M K Das, P K Panigrahi","doi":"10.1007/s12046-024-02602-z","DOIUrl":"https://doi.org/10.1007/s12046-024-02602-z","url":null,"abstract":"Tetrahydrofuran (THF) hydrate is a useful material for cold storage applications and an excellent substitute for simulating natural gas hydrates. THF also serves as a thermodynamic promoter for hydrate formation. The selection of suitable THF concentration in the aqueous solution remains a challenging task for the utilization of the THF hydrate. Present work focuses on the influence of non-stoichiometric solutions on THF hydrate growth. The THF hydrate was grown in polycrystalline form as a gross hydrate layer from the wall towards the center of a cylindrical reactor. Experiments were conducted at the three THF concentrations 19.06, 30, and 15 wt% at 276.15 K and atmospheric pressure. Transient imaging of the hydrate provided the hydrate thickness with time. Moreover, the chemical affinity model was used to analyze the hydrate formation kinetics. An increase in the concentration of the THF in bulk solution accelerated hydrate growth with time. We found that non-homogeneity in the THF hydrate front increased in the azimuthal direction if the concentration of THF in the THF-water solution deviated from stoichiometric concentration. A hypothesis was also proposed to explain the above observation. The non-homogeneity was qualitatively shown by binary images and mathematically quantified using the maximum to minimum hydrate thickness ratio. The chemical affinity model proved effective in describing hydrate growth kinetics.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261683","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

Buckling performance optimization of sub-stiffened composite panels with straight and curvilinear sub-stiffeners 带有直线和曲线次加强筋的次加强复合板的屈曲性能优化

Sādhanā Pub Date : 2024-09-19 DOI: 10.1007/s12046-024-02601-0

HAMDA CHAGRAOUI, MOHAMED SOULA

{"title":"Buckling performance optimization of sub-stiffened composite panels with straight and curvilinear sub-stiffeners","authors":"HAMDA CHAGRAOUI, MOHAMED SOULA","doi":"10.1007/s12046-024-02601-0","DOIUrl":"https://doi.org/10.1007/s12046-024-02601-0","url":null,"abstract":"This paper studies the buckling behavior of T-shaped composite stiffened panels reinforced by both straight and curvilinear sub-stiffening configurations subjected to compression. First, the simulated buckling response of the T-shaped stiffened composite panel is verified with experimental results from the existing literature. Subsequently, straight and curvilinear I-shaped sub-stiffeners are introduced into the design of the T-shaped stiffened composite panel. The distribution and laminate stacking sequence of straight and curvilinear sub-stiffened composite panels are optimized to improve buckling performance while maintaining a constant weight constraint. Further, a parametric analysis was implemented to assess the influence of the sub-stiffener curvature on the buckling response of the curvilinear grid sub-stiffened composite panel. Results demonstrate that introducing straight and curvilinear grid sub-stiffeners into the T-shaped stiffened composite panel improves buckling performance. Specifically, the introduction of straight sub-stiffeners results in a remarkable improvement of up to 200% in buckling performance, while introducing curvilinear grid sub-stiffeners exhibits an even more noteworthy improvement of up to 260%, which shows the superior design of curvilinear grid sub-stiffeners when compared to straight sub-stiffeners. This investigation delivers valuable insights into the design of sub-stiffened composite panels for improving structural performance, offering significant advantages for industries such as aerospace that require lightweight structures yet are resistant to buckling.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261636","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

Transformer-based Pouranic topic classification in Indian mythology 基于变压器的印度神话 Pouranic 主题分类

Sādhanā Pub Date : 2024-09-19 DOI: 10.1007/s12046-024-02598-6

Apurba Paul, Srijan Seal, Dipankar Das

引用次数: 0

Development and analysis of Hastelloy-X alloy butt joint made by laser beam welding 激光束焊接哈氏-X 合金对接接头的开发与分析

Sādhanā Pub Date : 2024-09-18 DOI: 10.1007/s12046-024-02603-y

G Sathishkumar, S Senthil Murugan, P Sathiya

{"title":"Development and analysis of Hastelloy-X alloy butt joint made by laser beam welding","authors":"G Sathishkumar, S Senthil Murugan, P Sathiya","doi":"10.1007/s12046-024-02603-y","DOIUrl":"https://doi.org/10.1007/s12046-024-02603-y","url":null,"abstract":"The investigation describes the processing and analysis of laser welded Hastelloy-X (HX) alloy joints through this paper. HX alloys are employed in aerospace and nuclear industries, especially for high-temperature applications. In this research, a series of laser beam welding (LBW) experiments denoted as E1 to E9 were conducted on the HX base metal (BM), adhering to the L9-orthogonal array (L9-OA) design matrix. CO2 laser technology was employed to fabricate HX butt joints. The laser power, focal length and welding speed were the variables. Then, the character of each joint was analyzed by sophisticated testing methods as per ASTM standards. The results showed that the character of each sample was varied depending on the selection of parameters. The E5 sample had a maximum tensile strength (TS) and ductility with 93 % joint efficiency. The grain elongation and refinement in the weld zone (WZ) were confirmed through microstructures and electron back scattered diffraction (EBSD) studies. The corrosion character of each joint (E1 to E9) was analyzed using the potentiostatic polarization method. The E1 sample had the highest corrosion resistance. The corrosion rate was in the range of 7.4E−03 to 8.6E−05 mm/yr. The dry sliding wear test (A1 to A9) was carried out as per L9-OA on the E1 sample, since this weld parameter had good corrosion resistance, by varying applied load, sliding distances and sliding velocities. Wear test results showed an increase in wear rate with the increase in load and sliding distance. A wear map was also drawn using the results to find out the association between wear rates and wear parameters. Weld speed had influenced the strength of the joint and laser power had shown an impact on the corrosion and wear of the HX alloy joints. The weld zone, corroded sample and the worn-out surfaces of weld joints were further analyzed using an optical microscope (OM) and Field Emission Scanning Electron Microscopy (FESEM).","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261638","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

Comparative analysis of a remotely-controlled wetland paddy seeder and conventional drum seeder 遥控湿地水稻播种机与传统滚筒播种机的比较分析

Sādhanā Pub Date : 2024-09-17 DOI: 10.1007/s12046-024-02604-x

Sujit Hensh, Hifjur Raheman, Ganesh Upadhyay, Soumen Bera

{"title":"Comparative analysis of a remotely-controlled wetland paddy seeder and conventional drum seeder","authors":"Sujit Hensh, Hifjur Raheman, Ganesh Upadhyay, Soumen Bera","doi":"10.1007/s12046-024-02604-x","DOIUrl":"https://doi.org/10.1007/s12046-024-02604-x","url":null,"abstract":"A remotely-controlled wetland paddy seeder (RCWPS) with a mechatronic seed-metering device was developed for precise sowing of pre-germinated paddy seeds in wet puddled field. The RCWPS, powered by a 180 W DC motor, utilized two lugged wheels for propulsion. Linear actuator-controlled dog clutch was connected with each wheel to discontinue the power supply while turning. The four-row seed metering unit comprised a seed metering plate with holes at 200 mm spacing, actuated by a solenoid. The diameter of the metering plate hole, operating speed, and speed of agitation were maintained at 11.18 mm, 0.84 km h−1, and 37 rpm, respectively. This comparative study assessed its performance and operational costs at 1/3rd and 2/3rd seed filling levels under puddled conditions, comparing it to a conventional drum seeder. At 2/3rd seed filling, RCWPS demonstrated 96% feed index quality, no multiple index, 4% missing index, 85.46% hill-distribution uniformity coefficient, and 72.45% seed dropping uniformity coefficient. Meanwhile, the values observed for drum seeder were 78.33%, 6.67%, 15%, 69.85%, and 60.94%, respectively. Similar results were observed at 1/3rd filling level. It showed better quality seed-dropping with RCWPS compared to the conventional drum seeder at all degrees of seed filling. The total cost for seeding per hectare of land with RCWPS and drum seeder were found to be 28.05 USD and 12.77 USD, respectively and the break-even point were found 0.54 ha year−1 and 0.038 ha year−1, respectively.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"188 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261640","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

Torque generation in lightweight four rotor magnetorheological brake 轻型四转子磁流变制动器的扭矩生成

Sādhanā Pub Date : 2024-09-17 DOI: 10.1007/s12046-024-02607-8

Shubham Kadam, Ashok Kumar Kariganaur, Hemantha Kumar

{"title":"Torque generation in lightweight four rotor magnetorheological brake","authors":"Shubham Kadam, Ashok Kumar Kariganaur, Hemantha Kumar","doi":"10.1007/s12046-024-02607-8","DOIUrl":"https://doi.org/10.1007/s12046-024-02607-8","url":null,"abstract":"Non-Newtonian behaviour of the Magnetorheological (MR) fluid under the influence of external magnetic field can be commissioned to design various applications such as MR brake, damper, and clutches, etc. Better design strategies, material selection and characterization led to realize the potential of MR brakes to replace conventional brakes. The present study emphasises on developing lightweight (1.8 kg) multi-rotor MR brake (MMRB). Finite element method magnetics (FEMM) software is utilized to determine the material required for a single-rotor MRB. FEMM material selection analysis is incorporated into the modeled MMRB, and the nature of magnetic flux density throughout the MR gap was obtained. Magnetic circuit analysis of the proposed brake is carried out to find torque estimation using analytical equations and Bingham plastic model. The proposed brake is fabricated and characterized using commercial MRF (132 DG, Lord Corporation). The study compares the torque outputs obtained experimentally with finite element analysis (FEA) and analytical approach. The average maximum magnetic flux density through FE analysis is found to be 0.45 T @ 3 A current. The average error between FE obtained and experimentally obtained torque output of the brake is around 5%. Further, an alternate design is proposed by utilizing same rotor diameter and number of electromagnetic coils. The new design is lighter in weight (0.8 kg) and exhibits enhancement in the torque output and torque to weight ratio by around 31% and 55%, respectively than the present design.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261641","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 experimental analysis of a robust event triggered super twisting sliding mode control for Quadcopter trajectory tracking 用于四旋翼飞行器轨迹跟踪的鲁棒事件触发超扭曲滑模控制实验分析

Sādhanā Pub Date : 2024-09-16 DOI: 10.1007/s12046-024-02566-0

Sarika Raju, Ezhilarasi Deenadayalan, Ramakalyan Ayyagari

引用次数: 0

Development of a robust and integrable pre-processing tool for isogeometric analysis 为等时几何分析开发稳健且可积分的预处理工具

Sādhanā Pub Date : 2024-09-14 DOI: 10.1007/s12046-024-02556-2

Akshay Pimpalkar, Vishal Agrawal, Sachin S. Gautam

{"title":"Development of a robust and integrable pre-processing tool for isogeometric analysis","authors":"Akshay Pimpalkar, Vishal Agrawal, Sachin S. Gautam","doi":"10.1007/s12046-024-02556-2","DOIUrl":"https://doi.org/10.1007/s12046-024-02556-2","url":null,"abstract":"The geometries constructed using the standard CAD software are always boundary-represented (B-Rep). Due to this, analysis-suitable volumetric parameterization of the geometries constructed using the standard CAD software is necessary for three-dimensional isogeometric analysis (IGA). This paper presents a user-friendly, robust volumetric parametrization tool capable of processing the B-Rep of the geometries constructed in one of the most popular CAD software, i.e. Rhinoceros®. The developed tool traverses multiple stages, starting with reading the standard 3DM CAD files of an arbitrarily shaped geometry. It then extracts surface control points, organizes them to establish an outer structural framework, and employs Coons volume parameterization to generate internal control points based on user-defined specifications. We use the NURBS-Python library for reading 3DM files and the NURBS toolbox to visualize and evaluate NURBS functions in the constructed geometries. We construct several baseline and intricate shape geometries to showcase the robustness and generality of the developed tool. Additionally, to demonstrate the effectiveness and applicability of our tool for IGA of non-linear three-dimensional problems, we simulate frictionless contact between two deformable geometries constructed using the developed tool.","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"212 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261643","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

Evaluation of the deposition mass, thickness and micro-hardness of TiN layer applied on AISI D2 tool steel by electrophoretic deposition 通过电泳沉积法评估 AISI D2 工具钢上 TiN 层的沉积质量、厚度和显微硬度

Sādhanā Pub Date : 2024-09-14 DOI: 10.1007/s12046-024-02610-z

Vahid Pouyafar, Ali Babaei, Ramin Meshkabadi, Samad Taghizadeh

引用次数: 0

Patient-specific modelling of coronary hemodynamics: state of the art 针对特定患者的冠状动脉血流动力学建模：最新进展

Sādhanā Pub Date : 2024-09-14 DOI: 10.1007/s12046-024-02589-7

Mudrika Singhal, Raghvendra Gupta

{"title":"Patient-specific modelling of coronary hemodynamics: state of the art","authors":"Mudrika Singhal, Raghvendra Gupta","doi":"10.1007/s12046-024-02589-7","DOIUrl":"https://doi.org/10.1007/s12046-024-02589-7","url":null,"abstract":"Coronary arteries serve a crucial purpose in the circulatory system as they supply blood to the human heart, a highly oxidative organ. As the blood flows through these arteries, the constituents of blood such as proteins and fatty acid molecules may start depositing on the arterial lining. These depositions narrow down the arteries and obstruct the blood flow to the heart. This phenomenon is termed as atherosclerosis, responsible for coronary artery disease, a leading cause of death globally. The progression of disease is affected by coronary hemodynamics which strongly depends on the geometrical complexities such as branching and tapering, and the associated parameters such as curvature and tortuosity. These geometrical parameters vary across the population and are affected by factors such as dietary habits, gender, lifestyle and genetics. Technological advancements in the past few decades have resulted in emergence of patient-specific computational fluid dynamics (CFD) modelling as an important tool in cardiovascular engineering and technology. Patient-specific CFD modelling utilises the clinically obtained patient-specific geometrical and boundary condition data to model the flow and gain an insight in the detailed hemodynamic behaviour, calculate different parameters which can be used as biomarkers and assess different treatment options. In this article, we provide a brief overview of the human coronary circulation and typical steps involved in patient-specific modelling. Further, the studies on patient-specific coronary hemodynamics are extensively reviewed and a perspective on future trends is provided. We believe that the article will serve as a beginner’s guide for the researchers working in this emerging area.<h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":21498,"journal":{"name":"Sādhanā","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261646","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

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