Engineering reports : open access最新文献

{"title":"Computational fluid dynamics of coronary arteries with implanted stents: Effects of Newtonian and non-Newtonian blood flows","authors":"Fatemeh Ahadi,&nbsp;Mojtaba Biglari,&nbsp;Mohammad Azadi,&nbsp;Mahdi Bodaghi","doi":"10.1002/eng2.12779","DOIUrl":"10.1002/eng2.12779","url":null,"abstract":"<p>This study introduces and compares computational fluid dynamics of Newtonian and non-Newtonian blood flows in coronary arteries, with and without considering stents. Three blood flow models, including Newtonian, Carreau, and non-Newtonian power-law models, were simulated to investigate their effect, and the solution algorithm includes drawing the geometry, creating the desired mesh, and then simulating Newtonian and non-Newtonian blood flow different models and comparing them with each other, is presented in the article. A Newtonian fluid model has been commonly used in the simulation of blood flow, whereas blood has non-Newtonian properties due to the nature of a solution containing suspended particles. The goal of this research is to investigate the differences between the models built with Newtonian and non-Newtonian fluid assumptions. In addition, a stent was designed and the effect of the stent on blood flow parameters was investigated for all three flow models, including Newtonian, Carreau, and non-Newtonian power-law models. Stents are medical devices that can be placed in arteries to open up blood flow in a blocked vessel. Stents can affect the wall shear stress. Knowing the slight deformation of the shear stress makes the importance of stent implantation and also helps to optimize the design of the intravascular stent, which can affect the occlusion of the vessels. The distribution of the velocity, pressure, and wall shear stress in all blood flow models with and without considering the effect of stents have been investigated and finally compared. Therefore, in general, the innovation of this article is to find the effect of implanted stents on blood flow parameters with different blood flow models, both Newtonian and non-Newtonian. A comparison of Newtonian and non-Newtonian flows showed that in the case of the Carreau non-Newtonian model, the wall shear stress was higher. In addition, in the results of the geometric model with a stent effect compared to the geometric model without a stent effect, it is evident that there was a higher velocity and wall shear stress.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12779","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135770023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on improving the durability performance of damaged concrete with mineral admixtures","authors":"Jing Jing,&nbsp;Shuai Liu,&nbsp;Chunhui Guo,&nbsp;Baolin Guo","doi":"10.1002/eng2.12781","DOIUrl":"10.1002/eng2.12781","url":null,"abstract":"<p>Concrete can be damaged under long-term chloride ion action. This article uses mineral admixtures to repair the damaged concrete, and then conducts durability performance tests. Multi-dimensional chloride ion diffusion tests were conducted under different salt solution immersion environments. The resistance of concrete to chloride ion corrosion was evaluated through RCM chloride ion penetration test, and the internal chloride ion concentration of concrete with different diffusion dimensions was detected through chemical titration analysis. Taking the SW test group as an example, after soaking for 3 months, the three-dimensional diffusion chloride ion concentration of the SW test group is 2.55 times that of the one-dimensional diffusion. Under the same three-dimensional diffusion conditions, at a depth of 10 mm of concrete erosion, the chloride ion concentration of the SW test group after soaking for 3 months is 1.76 times that of the chloride ion concentration after soaking for 1 month. Experiments have shown that multi-dimensional diffusion can significantly increase the concentration of chloride ions inside concrete, and this effect becomes more pronounced with the increase of erosion time and dimension.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12781","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135817366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A case study: Analyzing the structure and optimizing the design of the aero handlebar assembly for the bicycle used in Japan's Olympic games","authors":"Sourav Das,&nbsp;Francesco Di Giuseppe,&nbsp;Antonio Flores,&nbsp;Sandhya Parate,&nbsp;Jaideep Bangal","doi":"10.1002/eng2.12783","DOIUrl":"10.1002/eng2.12783","url":null,"abstract":"<p>This article examines a case study involving a 3D-printed titanium “aero base handlebar” that failed and caused a crash during the Japan 2020 Olympics. The failure was attributed to the handlebar's design, which did not meet the increasing demands of customers in terms of safety, cost, reliability, and comfort. The handlebar was created using in-house Altair product tools like Inspire Studio, SIMSOLID, and SULIS. Static structural analysis was conducted by estimating boundary forces. The analysis revealed that the original handlebar design, with a width of 50 mm, did not meet the required safety standards. To address safety concerns, the article proposed moving the arms forward by 35 mm (1.37 in.) to create clearance and attempting to secure a modified aero handlebar with an 85 mm width. The modified design incorporated a lattice structure, which exhibited higher levels of deformation and stresses, as well as lower maximum fatigue damage compared to the original 50 mm design. These results highlight the importance of considering customer expectations for safety, reliability, and comfort. Company Altair's advanced proprietary software, including Inspire Studio, SIMSOLID, and SULIS, in addition to employing lattice optimization methods, can support designers and engineers in fulfilling these requirements and creating products that are both safer and more reliable.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135771100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on improving the durability performance of damaged concrete based on ultra high performance concrete repair","authors":"Shanshan Wang,&nbsp;Shuai Liu,&nbsp;Wenwu Zhang,&nbsp;Baolin Guo","doi":"10.1002/eng2.12780","DOIUrl":"10.1002/eng2.12780","url":null,"abstract":"<p>This article uses ultra-high performance concrete (UHPC) to repair damaged concrete and analyzes the durability performance of the repaired concrete. Among them, three erosion solutions with a mass concentration of 2.8% NaCl + 0.29% Na₂SO₄, 5% NaCl, and 5% NaCl + 10% Na₂SO₄ were designed to soak the concrete specimens for 1 to 3 months. Taking the SWC test group as an example, when the concrete test block undergoes 30 dry wet cycles and the erosion depth is 20 mm, the difference in chloride ion concentration under different diffusion dimensions is not significant. After 90 dry wet cycles, at a depth of 20 mm, the chloride ion concentration inside the concrete in the three-dimensional diffusion state reached 3 times that of one-dimensional diffusion, and the chloride ion concentration in the two-dimensional diffusion state also reached 2 times that of one-dimensional diffusion. At a depth of 30 mm, a small amount of chloride ion content was also found in the two-dimensional diffusion and three-dimensional diffusion.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12780","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135864386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of bridge cable force damage based on Bayesian inference","authors":"Zhong-shi Chen,&nbsp;Jian-bing Zheng,&nbsp;Tian-yun Chu,&nbsp;Jing-jing Li,&nbsp;Yang Ding","doi":"10.1002/eng2.12782","DOIUrl":"10.1002/eng2.12782","url":null,"abstract":"<p>Bridge cable is an important force transmission component of bridge, but it is easy to be damaged during service, such as fatigue damage and corrosion damage, which seriously threatens the safety of bridge structure. Therefore, it is necessary to identify damage of cable force. Generally, the damage of cable force can be identified by the change of cable frequency. This paper establishes a cable force damage identification model based on Bayesian inference and uses Metropolis-Hastings (MH) algorithm to solve the posterior probability function of unknown parameter. In the Bayesian inference model, the influence of the priori function of unknown parameters on the posterior probability distribution model is discussed. In the MH algorithm, the influence of different proposed distributions (Normal distribution, Gamma distribution and Weibull distribution) on the sampling results is discussed based on three numerical simulation studies, and the influence of burned sample proportion on the establishment of a posteriori distribution function is analyzed. Furthermore, the influence of monitoring noise data and missing data on cable force damage identification is considered, and the robustness of the proposed method is analyzed.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12782","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135817307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Data-driven framework for warranty claims forecasting with an application for automotive components","authors":"Mohammad Babakmehr,&nbsp;Sascha Baumanns,&nbsp;Abdallah Chehade,&nbsp;Thomas Hochkirchen,&nbsp;Mahdokht Kalantari,&nbsp;Vasiliy Krivtsov,&nbsp;David Schindler","doi":"10.1002/eng2.12764","DOIUrl":"10.1002/eng2.12764","url":null,"abstract":"<p>Automakers spend billions of dollars annually towards warranty costs, and warranty reduction is typically high on their priorities. An accurate understanding of warranty performance plays a critical role in controlling and steering the business, and it is of crucial importance to fully understand the actual situation as well as be able to predict future performance, for example, to set up adequate financial reserves or to prioritize improvement actions based on expected forthcoming claims. Data maturation, a major nuisance causing changes in performance metrics with observation time, is one of the factors complicating warranty data analysis and typically leads to over-optimistic conclusions. In this paper, we propose a sequence of steps, decomposing and addressing the main reasons causing data maturation. We first compensate for reporting delay effects using a Cox regression model. For the compensation of heterogeneous build quality, sales delay, and warranty expiration rushes, a constrained quadratic optimization approach is presented, and finally, a sales pattern forecast is provided to properly weigh adjusted individual warranty key performance indicators. The results are shown to dramatically improve prior modeling approaches.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12764","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135771098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on mapping relationship between environmental load and vibration response of bridge structure based on structural health monitoring data","authors":"Zhong-Fa Qiao,&nbsp;Yang Ding,&nbsp;Mi Zhou,&nbsp;Xiao-Wei Ye","doi":"10.1002/eng2.12778","DOIUrl":"10.1002/eng2.12778","url":null,"abstract":"<p>With the increasing lifespan of bridges, various forms of deterioration will inevitably occur. The bridge health monitoring system enables direct monitoring of the loads (such as wind, temperature, and vehicles) experienced by the bridge during operation, as well as the corresponding vibration response of the bridge structure (including main beam deformation, tower top displacement, cable acceleration, etc.). These data provide valuable insights into the safety and durability of the bridge during its operational lifetime. However, the challenge lies in extracting meaningful information from the vast amount of collected data. This article focuses on the Fuyu Bridge as a research case and analyzes the variations in environmental factors, such as temperature, humidity, wind load, and structural vibration responses (main beam and cable), obtained from the Fuyu Bridge's structural health monitoring system. It also conducts a structural safety assessment during the operational period of the bridge. Furthermore, the research explores the relationship between environmental factors, load effects, and structural response to establish a foundation for future structural safety assessments of the Fuyu Bridge during its operational period. For instance, changes in environmental factors or load effects can be used to predict structural responses. Additionally, this study provides access to the structural health monitoring data of the Fuyu Bridge, facilitating data-driven research for other scholars in the field.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12778","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136128901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EWM: An entropy-based framework for estimating energy consumption of edge servers","authors":"Guangxu Li,&nbsp;Junke Li","doi":"10.1002/eng2.12777","DOIUrl":"10.1002/eng2.12777","url":null,"abstract":"<p>In mobile edge computing (MEC), accurately predicting and monitoring the energy consumption of edge servers is a key challenge in achieving green computing. The importance of solving this problem is that it can help optimize the energy usage in data centers and thus reduce the carbon emission of MEC. To this end, we propose an innovative entropy-based power modeling framework called entropy weighted model (EWM). The EWM framework weights and combines classical prediction models by analyzing the major components of a server and selecting appropriate parameters. We validate the performance of EWM using real server power and performance counter data and compare it with other classical prediction models by Friedman test. The results show that EWM outperforms other classical prediction models in all test datasets. This result validates the significant advantages of our EWM framework in solving the critical problem of edge server power prediction, and provides an effective tool for achieving data center energy optimization and promoting green computing, resulting in a highly general and accurate prediction model.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12777","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136308594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SREM: Smart renewable energy management scheme with distributed learning and EV network","authors":"Huakun Huang,&nbsp;Sihui Xue,&nbsp;Lingjun Zhao,&nbsp;Dingrong Dai,&nbsp;Weijia Wang,&nbsp;Huijun Wu,&nbsp;Zhou Cao","doi":"10.1002/eng2.12763","DOIUrl":"10.1002/eng2.12763","url":null,"abstract":"<p>In this article, aiming to develop the Green Internet of Vehicles (G-IoV), we propose a smart energy management system that leverages the intelligence edge clients and the distributed electric vehicles (EVs). The system proposed in this article incorporates the benefits of both software, specifically in terms of the user interface, and hardware, specifically in terms of edge clients. In particular, this system integrates intelligence edge clients with an EV CAN bus network as an electronic control unit. By leveraging the intelligent edge clients recommendation system, EVs can make informed decisions on battery charging or discharging actions. As a result, a virtual-power-plant (VPP) can treat the EVs network as a vast intelligent energy storage facility, efficiently managing the battery energy of all distributed EVs connected to the platform and fully utilizing the electricity generated from renewable energy sources. We experimentally verify that using federal learning to train models in EV networks versus training models directly in EVs, using federal learning in EV networks yields better experimental results.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12763","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136314474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increasing green footprints: Indications of transformations in the socio-economic spaces of Bangladesh","authors":"S. S. M. Sadrul Huda","doi":"10.1002/eng2.12775","DOIUrl":"10.1002/eng2.12775","url":null,"abstract":"<p>In recent decades, Bangladesh has seen significant environmental degradation and the loss of its GDP, which has had a detrimental effect on public health, agriculture, forestry, fisheries, industrial development, and environmental services. The unusually high temperatures, humidity, and unpredicted rainfall gave rise to disease like dengue and affecting peoples mental health. However, the government, as well as public and private groups, are undertaking some phenomenal efforts to help reduce environmental degradation and raise the number of green footprints. The objective of this article is to examine the green initiatives, strategies, and policies of Bangladeshi organizations in enhancing green footprints in the socio-economic spaces, through comprehensive content analysis of various newspapers, journal articles, government reports, and company annual reports. The aim of this article is to trace out the evidences of change in the socio-economic fabric of the society. The primary focus of the article on the environment friendly business activities, which eventually bring social changes. The article found that green HRM, green business, MFS, green corporate culture is increasingly been seen in the society, which indicate silent changes. Bangladesh has put regulations and programs into place to lessen carbon emissions and safeguard sensitive coastal areas. It is noteworthy for demonstrating a strong dedication to improving sustainable development and environmental preservation. Many organizations in Bangladesh have also received the prestigious Asia's Corporate Excellence and Sustainability Awards for their outstanding zeal to ensure positive environmental changes in the society. Moreover, large proportion of Bangladesh's energy mix comes from renewable energy sources, leading to the installed renewable energy capacity of 579 MW. Additionally, the government has announced plans on replacing traditional transport methods with electric or hybrid vehicles. Bangladesh has further solidified its position as the global leader in green garments factories, as the country has 176 such facilities that have received the USGBC's LEED accreditation. The article placed a strong emphasis on particular policy proposals, including the adoption of the circular economy, the digital economy, sustainable finance, car-sharing systems, renewable energy sources in manufacturing and workplaces, and environmentally friendly practices in both public and private organizations.</p>","PeriodicalId":72922,"journal":{"name":"Engineering reports : open access","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eng2.12775","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136266005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}