Scientia Iranica最新文献_第2页

Computation insight of modified thermal distribution of hybrid nanofluids in complex wavy channel: A comparative thermal approach for different nanofluid models 复杂波浪形通道中混合纳米流体修正热分布的计算洞察:不同纳米流体模型的比较热方法

4区工程技术

Scientia Iranica Pub Date : 2023-10-09 DOI: 10.24200/sci.2023.60957.7075

Imtiaz Ahmed, Shahid Hameed, Aamar Abbasi, Sami Ullah Khan, Waseh Farooq, Mohammed A. Almeshaal, Muapper Alhadri, Lioua Kolsi

{"title":"Computation insight of modified thermal distribution of hybrid nanofluids in complex wavy channel: A comparative thermal approach for different nanofluid models","authors":"Imtiaz Ahmed, Shahid Hameed, Aamar Abbasi, Sami Ullah Khan, Waseh Farooq, Mohammed A. Almeshaal, Muapper Alhadri, Lioua Kolsi","doi":"10.24200/sci.2023.60957.7075","DOIUrl":"https://doi.org/10.24200/sci.2023.60957.7075","url":null,"abstract":"Owing to enhanced thermal mechanism of nanomaterials, the researchers are continuously exploring the novel features of nanofluids and claiming multidisciplinary applications in solar systems, engineering processes, energy devices and automobile industries. The experimentally supported research proves that with interaction of different types of nanoparticles is more effective to enhance the thermal transportation phenomenon. Following such motivations in mind, the aim of present continuation is exploring the thermal impact of modified hybrid nanofluid model in complex vertical channel. Due to high thermal performances, copper (CuO), copper oxide (CuO) and aluminium oxide (Al_2 O_3) nanoparticles explore the thermal behavior of modified hybrid nanofluid model. The vertical channel confined the sinusoidal waves on walls. The flow phenomenon is based on peristaltic transport associated to the human body system. The consideration of small Reynolds number hypothesis and larger wavelength approach, the implication of problem has been done. The modeled equations are tackled with shooting technique. Various stream functions with applications of peristaltic transport phenomenon are developed. It is observed that heat transfer is larger in the curved channel as compared to the straight channel. The decomposition of modified hybrid nanoparticles is more effective to improve the heat transfer pattern more effectively.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135149695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A survey on data acquisition methods in conditional monitoring of wind turbines 风力发电机组状态监测数据采集方法综述

4区工程技术

Scientia Iranica Pub Date : 2023-10-09 DOI: 10.24200/sci.2023.62909.8100

Reza Heibati, Ramin Alipour-Sarabi, Seyed Mohammad Taghi Bathaee

{"title":"A survey on data acquisition methods in conditional monitoring of wind turbines","authors":"Reza Heibati, Ramin Alipour-Sarabi, Seyed Mohammad Taghi Bathaee","doi":"10.24200/sci.2023.62909.8100","DOIUrl":"https://doi.org/10.24200/sci.2023.62909.8100","url":null,"abstract":"The generation of electrical power through wind turbines has significantly increased nowadays. However, these systems are prone to faults that can disrupt the network and incur substantial costs for the generation units. Therefore, effective maintenance scheduling becomes crucial. A major challenge faced by wind turbines is their maintenance requirements, as any interruption in their operation and power generation can result in significant economic losses. Consequently, meticulous planning is indispensable to minimize such consequences. This paper that is the first part of the study conducts a survey of data acquisition methods in condition monitoring of wind turbines. In the second part, signal processing techniques for condition monitoring of wind turbines are presented. Furthermore, the paper examines a range of studies that have implemented practical condition monitoring methods in wind turbines, delving into the associated challenges and proposing potential solutions. Various methods such as vibration analysis, acoustic analysis, electrical parameter analysis, AI-based techniques, and fault-tolerant control have been employed for wind turbine maintenance. However, limitations exist in terms of data availability and computational burden. Future challenges include developing algorithms that require less data, reducing computational requirements, updating models with new conditions, enabling early detection and proactive maintenance, and reducing maintenance costs.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135149552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cyclic and post-cyclic geocell pullout behavior in cohesionless soil 无黏性土的循环和后循环土工格室拉拔行为

4区工程技术

Scientia Iranica Pub Date : 2023-10-09 DOI: 10.24200/sci.2023.60817.7002

Ali Namaei-kohal, Alireza Ardakani, Mahmoud Hassanlourad

{"title":"Cyclic and post-cyclic geocell pullout behavior in cohesionless soil","authors":"Ali Namaei-kohal, Alireza Ardakani, Mahmoud Hassanlourad","doi":"10.24200/sci.2023.60817.7002","DOIUrl":"https://doi.org/10.24200/sci.2023.60817.7002","url":null,"abstract":"As a geocell reinforced structure can be subjected to earthquake and pullout loads during its life time, it is obligatory to assess the pullout capacity and soil-geosynthetic interaction of geocell under cyclic loads. This research investigated the cyclic and post-cyclic pullout behavior of geocell in cohesionless soil using a series of 24 multi-stage pullout tests. The results indicated that the ultimate post-cyclic pullout load was less than the monotonic pullout load. This was the result of a reciprocating motion from loading caused by the interlock between the geocell infill soil and the surrounding material, which weakened and broke during the cyclic phase. It was found that, as the grain size of the soil increased, the interlocking strength increased and consequently the ultimate post cyclic pullout load increased. The soil particle size had a significant effect on the cumulative displacement during the cyclic phase. Furthermore, the increases in the loading amplitude and the number of cycles decreased the interlocking resistance of the infill soil with the surrounding material, which decreased the ultimate post-cyclic pullout load. The effect of the loading frequency likely depended on the geocell infill soil density.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135149545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Fault-Tolerant DC-DC Buck Converter with Zero Interruption Time for Autonomous Vehicles 自动驾驶汽车零中断容错DC-DC降压变换器

4区工程技术

Scientia Iranica Pub Date : 2023-10-09 DOI: 10.24200/sci.2023.61387.7283

Preethi Sharma K., Vijayakumar T.

{"title":"A Fault-Tolerant DC-DC Buck Converter with Zero Interruption Time for Autonomous Vehicles","authors":"Preethi Sharma K., Vijayakumar T.","doi":"10.24200/sci.2023.61387.7283","DOIUrl":"https://doi.org/10.24200/sci.2023.61387.7283","url":null,"abstract":"A high-end autonomous vehicle is expected to have at least a hundred different electronic subsystems. Each one of them takes power from the battery through Power Management Unit (PMU). Having an efficient PMU is crucial and is expected to supply the required level of uninterrupted power. PMU consists of several buck converters which translate a higher voltage level to required lower voltage levels. A PMU is more reliable if it consists efficient and well-structured voltage converters. In this paper, a fault-tolerant buck converter is designed which outputs 3.3 volts. A simple yet effective technique is proposed to design a fault-tolerant buck DC-DC converter by bypassing the faulty converter leg. The proposed system utilizes a signal processing-based method for fault detection. The secondary converter is activated only upon the confirmed prognosis of a faulty primary converter. Ripple content in the output Aluminum Electrolytic Capacitor (AEC) voltage is monitored and used as a primary health indicator for the converter. An experimental setup is built and tested in the laboratory. Experimental results indicate a smooth transition from the primary converter to the secondary demonstrating an uninterrupted power supply along with the simplicity and effectiveness of the proposed solution.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135148980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel Algorithm to minimize PAPR of OFDM system with Less Intricacy PTS using Various Modulation Schemes 利用各种调制方式，减少复杂PTS的OFDM系统的最小PAPR算法

4区工程技术

Scientia Iranica Pub Date : 2023-10-09 DOI: 10.24200/sci.2023.61419.7295

Deo Chandra Jaiswal, S. K. Sriwas, Abhishek Nigam, Siddharth Srivastava, Mahendra Kumar

引用次数: 0

Techno-economic analysis of a municipal wastewater treatment plant: A comparison among SBR, MLE & A2O Processes 某城市污水处理厂的技术经济分析:SBR、MLE和amp的比较A2O工艺

4区工程技术

Scientia Iranica Pub Date : 2023-10-09 DOI: 10.24200/sci.2023.61323.7250

Alireza Rabani mehr, Hasan Nikkhah, Mehrdad Farhadian

引用次数: 0

A New DC Offset Boostable Chaotic System with Multistability, Coexisting Attractors and Its Adaptive Synchronization 一种新的多稳定共存吸引子直流偏置可升压混沌系统及其自适应同步

4区工程技术

Scientia Iranica Pub Date : 2023-10-04 DOI: 10.24200/sci.2023.62359.7794

Rameshbabu Ramar, Sundarapandian Vaidyanathan

引用次数: 0

Spline NLMS Adaptive Filter Algorithm based on the Signed Regressor of Input Signal 基于输入信号符号回归量的样条NLMS自适应滤波算法

4区工程技术

Scientia Iranica Pub Date : 2023-10-04 DOI: 10.24200/sci.2023.62258.7738

Hossein Tavakoli, Mohammad Shams Esfand Abadi

引用次数: 0

A risk-return based mathematical model for resource allocation with considering the process resilience and continuity 考虑过程弹性和连续性的基于风险收益的资源分配数学模型

4区工程技术

Scientia Iranica Pub Date : 2023-10-04 DOI: 10.24200/sci.2023.61263.7229

Mahnaz Ebrahimi-Sadrabadi, Bakhtiar Ostadi, Ali Husseinzadeh Kashan, Mohammad Mehdi Sepehri

{"title":"A risk-return based mathematical model for resource allocation with considering the process resilience and continuity","authors":"Mahnaz Ebrahimi-Sadrabadi, Bakhtiar Ostadi, Ali Husseinzadeh Kashan, Mohammad Mehdi Sepehri","doi":"10.24200/sci.2023.61263.7229","DOIUrl":"https://doi.org/10.24200/sci.2023.61263.7229","url":null,"abstract":"In recent high-risk and changing world, optimal resource allocation is significant, which in case of inappropriate resource allocation, will cause significant damage to organizations. In resource allocation and where there is a lack of resources, it is imperative to processes continue and the process's resilience and the risks posed by these lack and unsuitable allocations. If resource allocation is not done properly or is done in short supply, there will be consequences, e.g., processes do not continue properly or are not resilient, or they will be increase in the risks of the processes. So, addressing the three mentioned issues such as organizational resilience, business continuity, and risks of the operational processes is of great importance in the problem of resource allocation. Also, the lack of integrated attention to the mentioned issues in the modeling of resource allocation in order to process optimization will lead to a decrease in resources’ utilization. Therefore, in this paper, a novel integrated mathematical model has been developed for resource allocation with considering the process resilience and continuity. Thus, the objective functions of the model are defined according to the four measures of optimal resource allocation such as return, risk, resilience and process continuity.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135646960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conservation Voltage Reduction Technology Yields Sustainable Electrifications: An Exploratory Study on Implementation Capability 节能降压技术实现可持续电气化:实施能力的探索性研究

4区工程技术

Scientia Iranica Pub Date : 2023-10-01 DOI: 10.24200/sci.2023.60769.6979

M. Spertip, F. Karbalaei, A. Yazdaninejadi

{"title":"Conservation Voltage Reduction Technology Yields Sustainable Electrifications: An Exploratory Study on Implementation Capability","authors":"M. Spertip, F. Karbalaei, A. Yazdaninejadi","doi":"10.24200/sci.2023.60769.6979","DOIUrl":"https://doi.org/10.24200/sci.2023.60769.6979","url":null,"abstract":"Conservation voltage reduction (CVR) as a readily available technology can easily tackle line congestion besides meeting the energy conservation by a marginal reduction in the voltages of user-end nodes. Although CVR can help to yield clean and sustainable electrifications, application of this technology is limited owing to some unclear technical aspects such as response to industrial loads, load modeling type, and load estimation error. This paper aims at presenting a comprehensive analysis of the CVR process to shed light on the various aspects of this technology for operators who seek to implement it. To this end, CVR process is explored based on load composition on a typical feeder with three zones. Different sizes for active and reactive powers in consumers of those zones are taken into consideration. By doing so, not only CVR process with different load arrangements is explored but also effect of the dominant loads on feeders is unveiled. This study also deals with identifying which load modeling type show better robustness to modeling errors. Moreover, CVR process in the pointed cases are performed with a considerable error on the parameters of load models. The obtained results show that in spite of expectations, CVR may have different outputs.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136059093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0