Frontiers of Mechanical Engineering最新文献

{"title":"Effect of flow rate and CNM concentration in nanofluid on the performance of convective heat transfer coefficient","authors":"A. Anggono, dan Riswanto, M. Ismoen, Masyrukan, Agus Hariyanto, J. Sedyono","doi":"10.3389/fmech.2023.1174185","DOIUrl":"https://doi.org/10.3389/fmech.2023.1174185","url":null,"abstract":"The aim of this study is to investigate the thermal performance of water-based Carbon Nano Material (CNM) nanofluids, particularly in the convective heat transfer coefficient (h) parameter, and to analyze the effects of nanoparticle concentration and flow rate on an experimental heat transfer system. To achieve this, the researchers prepared the nanofluid through a 2-step method. In the first step, we mixed the nanoparticles with the base fluid using a magnetic stirrer to ensure homogenization, with the CNM-Water ratio set at 30, 75, 120, and 150 ppm. In the second step, we characterized the prepared samples, determining their size, composition, and particle morphology through PSA and SEM-EDX examination, as well as measuring their density (ρ) and specific heat (Cp). The experiments were carried out using a flow rate simulation test rig with a data acquisition system, at different flow rates of 0.2, 0.6, 1, and 1.4 L/min. Temperature (T) was measured at the inlet, outlet, and heater to determine the convective heat transfer coefficient value. The study successfully investigated the direct impact of CNM concentration and flow rate, with the results showing a consistent and expected value of the coefficient compared to previous studies. The highest coefficient value was observed at 150 ppm CNM-Water ratio and a flow rate of 1.4 L/min, with a value of 1825.37 W/(m2.K).","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48237056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aging of a dielectric fluid used for direct contact immersion cooling of batteries","authors":"R. Daccord, Thiébaut Kientz, A. Bouillot","doi":"10.3389/fmech.2023.1212730","DOIUrl":"https://doi.org/10.3389/fmech.2023.1212730","url":null,"abstract":"Batteries of electric vehicles require appropriate cooling to allow for increased performances such as high energy density and fast charging capabilities. Immersion of the cells in a dielectric fluid provides substantial benefits in terms of safety and performance, but the selection of a relevant coolant remains a complex task and guidance to engineers in the field of vehicle electrification is sparce. This paper reviews the fluid properties which are considered most significant for this application, and provides an experimental comparison of the key properties of one candidate fluid under various aging conditions devised to reproduce several years of operation in a vehicle.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42256240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial: Quantum computing applications in computational engineering","authors":"R. Steijl, R. Maulik","doi":"10.3389/fmech.2023.1237653","DOIUrl":"https://doi.org/10.3389/fmech.2023.1237653","url":null,"abstract":"Quantum computing research is a very active and diverse area of research, including work on creating quantum processing hardware in addition to investigations of applications with the potential for significant speed-up over simulations on classical (non-quantum) computers. The focus of this Research Topic is on applications in computational science and engineering. For these applications, the development of effective quantum algorithms with a significant speed-up over classical algorithms running on classical computers, has shown limited overall progress and is still in its infancy. However, this area of research has seen significant growth and progress in recent years, as illustrated by the three articles in this Research Topic. The three articles in this Research Topic present advances in the development of quantum algorithms for applications in computational engineering, in particular computational fluid dynamics and structural mechanics. Two of the articles focus on original research in the area of computational fluid dynamics, while the third article provides a detailed review of existing work and prospects for quantum computing for partial differential equations in structural mechanics. Focusing on the concept of quantum annealing, the article by Ray et al. explores the feasibility of using quantum annealers for the simulation of fluid flows. In the literature, this approach has not been widely investigated. In their article, Ray et al. consider the wellstudied flow problem comprising the fully-developed pressure-driven flow between two infinite flat plates so that a linear, quasi-one-dimensional problem emerges. They then describe a framework to convert this type of problem in terms of an optimization problem suitable for use on quantum annealers. The D-Wave annealer (D-Wave, 2022) used in this work returns multiple states that sample the energy landscape of the problem and therefore the authors explore different solution selection strategies to approximate the solution of the problem. The obtained solutions are analyzed both qualitatively and quantitatively, showing, for example, the sensitivity to the precision used in the fixed-point representation of the velocity data. In recent years, a major research focus in quantum computer applications to fluid dynamics has been lattice-based modeling, in particular approaches based on the Lattice Boltzmann method, e.g., Todorova and Steijl (2020); Budinski (2021); Budinski (2022). The article byMoawad et al. focuses on quantum circuit implementations of the one-dimensional OPEN ACCESS","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48371249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular dynamics simulation of frictional properties of Pt cluster on graphite under load","authors":"S. Cörüt, S. Pek, K. Bilisik, I. Lyashenko","doi":"10.3389/fmech.2023.1211072","DOIUrl":"https://doi.org/10.3389/fmech.2023.1211072","url":null,"abstract":"Structural lubricity, characterized by nearly frictionless behavior at solid incommensurate interfaces with weak interactions, holds significant technological importance. However, various factors can lead to the breakdown of structural lubricity, such as spontaneous reorientation to a commensurate state, applied load, edge effects, deformations, and wear. To overcome these challenges, clusters can be employed at interfaces. With their high Young’s modulus and stiffness, clusters can withstand high loads and tolerate elastic deformations. Therefore, Pt cluster, which inherently possess incommensurate contact with graphite surface, are expected to exhibit structural superlubric behavior, even under high loads, as long as they can sustain incommensurate contact. Our molecular dynamics (MD) simulations, however, have revealed that a Pt cluster on graphite can undergo metastable transitions from the incommensurate state to a commensurate state, resulting in subsequent stick-slip behavior. In the absence of any external load, the Pt cluster has demonstrated the ability to maintain incommensurate contact with almost zero friction force, primarily attributed to its weak interaction with graphite. However, the presence of an applied load force leads to the loss of the initial incommensurate contact between the Pt cluster and graphite, resulting in the emergence of high friction forces and the breakdown of structural lubricity with a similar stick-slip behavior to that observed in the comparative simulations conducted for the commensurate state. It becomes evident that the maintenance of incommensurate contact is crucial for achieving superlubric behavior in Pt cluster-graphite systems, while the presence of an applied load force can disrupt this behavior and lead to higher friction forces.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44258257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis and research on the constant-rate penetration mechanism of the seabed cone penetration test system","authors":"Ziqiang Ren, Jia-wang Chen, Jin Guo, Bijin Liu, Xiaohui Hu, Hang Zhou, Hou-Hong Liu, F. Gao","doi":"10.3389/fmech.2023.1110951","DOIUrl":"https://doi.org/10.3389/fmech.2023.1110951","url":null,"abstract":"The seabed Cone Penetration Test (CPT) system is a common method for investigating offshore soil. This paper focuses on a new subsea CPT method for assessing physical and mechanical properties of marine sediments. The new method enables automatic docking and dismantling of the probe rods underwater. The constant-rate penetration mechanism is the basis and core component of the seabed CPT, allowing the probe rod and cone to penetrate the seafloor sediment. Double hydraulic cylinders are used to meet the high penetration force requirements. To maintain a constant penetration rate of 20 ± 5 mm/s, the model identification of the electro-hydraulic servo system is performed using Simcenter AMESim and MATLAB software, and the relevant transfer function is obtained using the PID method. Based on this transfer function, the sliding mode variable structure controller of the electro-hydraulic servo system is designed to regulate the constant penetration rate of the hydraulic cylinder against varying penetration resistance. In-situ measurements were operated using the new seabed CPT rig in Zhoushan Island. The simulation and testing results confirm that the sliding mode variable structure controller is suitable for controlling the system during actual operation.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48346941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Calibration and experiment of discrete element model parameters of Zanthoxylum bungeanum","authors":"Jian Wang, Lin Chen, Ying Tang, Zhifan Chen, Qingsong Wu, Dandan Han","doi":"10.3389/fmech.2023.1204659","DOIUrl":"https://doi.org/10.3389/fmech.2023.1204659","url":null,"abstract":"Zanthoxylum bungeanum is a characteristic spice in culinary culture. This article focuses on the lack of intrinsic and contact parameters for Zanthoxylum bungeanum and studies the intrinsic parameters of the discrete element for tribute pepper from Hanyuan. This is to provide support for the mechanized harvesting of Zanthoxylum bungeanum. The EDEM software was used to establish a discrete element model for Zanthoxylum bungeanum granules. The intrinsic parameters of Zanthoxylum bungeanum granules, such as Three-dimensional dimension, density, Poisson’s ratio, and elastic modulus, were measured through experiments. The elastic recovery coefficient, static friction coefficient, and rolling friction coefficient between Zanthoxylum bungeanum granules and Dragon Skin 30 silicone sheets were also measured. Subsequently, the elastic recovery coefficient, static friction coefficient, and rolling friction coefficient between Zanthoxylum bungeanum granules and materials, as well as between Zanthoxylum bungeanum granules were obtained through discrete element simulation experiments, steepest climb test, and Quadratic regression orthogonal rotation combination test. Finally, the Angle of repose was used for verification experiments. The results showed that the elastic recovery coefficient, static friction coefficient, and rolling friction coefficient between Zanthoxylum bungeanum granules and materials were 0.437, 0.758, and 0.0136, respectively, while those between Zanthoxylum bungeanum granules were 0.378, 0.56, and 0.0143, respectively. The error between the simulation angle of repose and the measured angle of repose was 0.204%, verifying the reliability of the discrete element model for Zanthoxylum bungeanum granules. This method is of great significance for the design and optimization of Zanthoxylum bungeanum harvesters.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42271077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Machine learning models for maintenance cost estimation in delivery trucks using diesel and natural gas fuels","authors":"Sasanka Katreddi, Arvind Thiruvengadam, G. Thompson, N. Schmid, V. Padmanaban","doi":"10.3389/fmech.2023.1201068","DOIUrl":"https://doi.org/10.3389/fmech.2023.1201068","url":null,"abstract":"The maintenance costs can represent about 15%–60% of the cost of produced goods depending on the type of goods transported. To comply with stringent emissions regulations, diesel engines are incorporated with complex after-treatment systems that demand increased maintenance. The availability of alternative fuels such as natural gas and propane has fostered the natural gas and propane powertrain systems as well as electrification options for heavy- and medium-duty vehicles. A critical barrier to adopting alternative fuel vehicles has been the lack of knowledge on comparative vehicle maintenance/repair costs with conventional diesel. Moreover, the region of operation, the type of vehicle operation, and seasonal temperature changes also affect the duty cycle which impacts the maintenance and repair costs. This study focuses on estimating the cost-per-mile for heavy-duty vehicles using machine learning models such as random forest, xgboost, neural networks, and a super-learner model. The super-learner model achieved an error as low as 0.0068 $/mile for mean absolute error and 0.0086 $/mile for root mean square error with a coefficient of determination/R-Squared of 97.28%. Specifically, the paper investigates the data collected from the maintenance and repair costs associated with delivery trucks using diesel and natural gas fuels. Since the availability of data is the major constraint, we leveraged the data collected by West Virginia University and the partnership with fleet companies. This allows for additional information related to maintenance costs and fleet-specific maintenance practices of alternative fuel vehicles. This study promotes clean fuel technologies and enables fleet management companies to adopt alternative fuel vehicles in case of similar or lower cost of maintenance compared to diesel vehicles resulting in reduced emissions and total cost of ownership.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46600822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical and energy absorption properties of 3D-printed honeycomb structures with Voronoi tessellations","authors":"A. M. Ragab, E. Mahdi, K. Oosterhuis, A. Dean, J. Cabibihan","doi":"10.3389/fmech.2023.1204893","DOIUrl":"https://doi.org/10.3389/fmech.2023.1204893","url":null,"abstract":"3D printing technology is the new frontier in building construction. It is especially useful for making small structures within a short period. Full construction, including interior partitions and exterior façades, can be achieved with this technology. This paper proposes a parametric Voronoi tessellations model for quickly generating and fabricating 3D-printed hexagonal honeycomb partitions for interior design. Comprehensive experimental testing was conducted to characterize the mechanical properties and investigate the energy absorption characteristics of the proposed 3D-printed hexagonal honeycomb while comparing it to alternative hexagonal honeycomb structures. The tests included tensile testing (ASTM-D638) of the printed Polylactic Acid (PLA) material, especially with the almost total absence of conducted research that reported mechanical properties for 3D printed material with low infill percentages such as 10%. In addition, an in-plane quasi-static axial compression testing of the lightweight honeycomb structures was also conducted on the printed structure with the same low infill percentage. Compared to non-Voronoi honeycomb structures, the Voronoi honeycomb resulted in superior mechanical and energy absorption properties with energy absorption values ranging from 350 to 435 J and crash force efficiency being 1.42 to 1.65.","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41466025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Footholds optimization for legged robots walking on complex terrain","authors":"Yunpeng Yin, Yue Zhao, Yuguang Xiao, F. Gao","doi":"10.1007/s11465-022-0742-y","DOIUrl":"https://doi.org/10.1007/s11465-022-0742-y","url":null,"abstract":"","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42050235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of a novel side-mounted leg mechanism with high flexibility for a multi-mission quadruped earth rover BJTUBOT","authors":"Yifan Wu, Sheng Guo, Luquan Li, Lianzheng Niu, Xiao Li","doi":"10.1007/s11465-022-0740-0","DOIUrl":"https://doi.org/10.1007/s11465-022-0740-0","url":null,"abstract":"","PeriodicalId":48635,"journal":{"name":"Frontiers of Mechanical Engineering","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48621546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}