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A New Method for the Integrated design of Variable Refrigerant Volume System and Light Steel Fabricated Buildings

Science technology and engineering 2024年第15期24卷 6354-6365页

作者： Xu, Xin-Yue Li, Hong-Qiang Liu, Li-Fang Mao, Ying-Jie College of Civil Engineering Hunan University Changsha410082 China Key Laboratory of Building Safety and Energy Efficiency Ministry of Education Changsha410082 China International Joint Research Center for Building Safety and Environment Changsha410082 China School of Civil Engineering Hunan University of Science and Technology Xiangtan411201 China Hunan University Design and Research Institute Co. Ltd Changsha410082 China

In recent years, lightweight steel prefabricated buildings have been widely used in engineering practice due to their advantages of convenient construction and high environmental benefits, and have great application prospects. However, due to the subsequent construction caused by the traditional heating, ventilating and air conditioning(HVAC) design method that may damage building components, the traditional HVAC design method is no longer applicable to lightweight steel prefabricated buildings. At present, there is relatively little research and application on the integration of HVAC and light steel prefabricated buildings. To fill the gap in this field, a new integrated design method of HVAC system IB-VRV(taking variable refrigerant volume air conditioner as an example) and light steel prefabricated building (variable refrigerant volume air conditioner integrating with buildings) was proposed. And the difference between the HVAC design method applicable to traditional buildings and the HVAC design method applicable to light steel prefabricated building were explored. According to the difference between the two HVAC design methods, on the basis of the existing traditional HVAC design concept, three principles of integration of HVAC system and light steel prefabricated building were summarized. These three fusion principles were structural safety priority, non identical life cycle, and functional area elasticity. Based on the above three principles, a new integration mode of HVAC system and light steel prefabricated building was proposed, and analysis was carried out with the case of variable refrigerant volume(VRV) system. The research results show that IB-VRV can make up for the shortcomings of the traditional HVAC design method applied to light steel prefabricated building. And IB-VRV can give full play to the advantages of light steel prefabricated building, such as light deadweight, simple structure, small components that can be concealed. This work opens up a

关键词： Partitions (building)

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Observation of fractal topological states in acoustic metamaterials

arXiv

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arXiv 2022年

作者： Zheng, Shengjie Man, Xianfeng Kong, Ze-Lin Lin, Zhi-Kang Duan, Guiju Chen, Ning Yu, Dejie Jiang, Jian-Hua Xia, Baizhan State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Hunan Changsha410082 China College of Mechanical and Electrical Engineering Changsha University Hunan Changsha410022 China Institute of Theoretical and Applied Physics School of Physical Science and Technology Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Jiangsu Suzhou215006 China

Topological phases of matter have been extensively investigated in solid state materials and classical wave systems with integer dimensions. However, topological states in non-integer dimensions remain largely unexplored. Fractals, being nearly the same at different scales, are one of the intriguing complex geometries with non-integer dimensions. Here, we demonstrate acoustic Sierpiński fractal topological insulators with unconventional higher-order topological phenomena via consistent theory and experiments. We discover abundant topological edge and corner states emerging in our acoustic systems due to the rich edge and corner boundaries inside the fractals. Interestingly, the numbers of the edge and corner states scale the same as the bulk states with the system size and the exponents coincide with the Hausdorff fractal dimension of the Sierpiński carpet. Furthermore, the emergent corner states exhibit unconventional spectrum and wave patterns. Our study opens a pathway toward topological states in fractal geometries. © 2022, CC BY-NC-SA.

关键词： Topology

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Improving the cycle stability of FeCl3-graphite intercalation compounds by polar Fe2O3 trapping in lithium-ion batteries

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Nano Research 2019年第8期12卷 1836-1844页

作者： Zheng Li Chengzhi Zhang Fei Han Fuquan Zhang Dianwu Zhou Shaohua Xu Hongbo Liu Xuanke Li Jinshui Liu College of Materials Science and Engineering Hunan University Changsha 410082China Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082China

FeCI3-intercalated graphite intercalation compounds (GICs) with high reversible capacity and high volumetric energy density are attractive anode material alternatives of commercial graphite. However, the rapid capacity decay, which was induced by chloride dissolution and shuttling issues, hindered their practical application. To address this problem, here, we introduce flake-like Fe2O3 species with inherently polar surface on the edge of FeCl3 -intercalated GICs through microwave-assisted transformation of a fraction of FeCl3 component. Theoretical simulations and physical/electrochemical studies demonstrate that the introduced Fe2O3 component can afford sufficient polar active sites for chemically bonding the soluble FeCl3 and LiCl species based on the polar-polar interaction mechanism, further inhibiting the outward diffusion of the chlorides and immobilizing them within the GIC material. In a lithium ion cell, the FeCl3 -intercalated GIC with a suitable Fe2O3 content shows remarkably improved cycling stability with a high reversible capacity of 1,041 mAh·g^-1 at a current density of 200 mA·g^-1. Capacity retention of 91 % is achieved at a high current density of 1,000 mA·g^-1 over 300 cycles. This work opens up the new prospect for immobilizing chlorides by introducing inorganic species in GIC for long-cycle electrochemical batteries.

关键词： transition metal chloride graphite intercalation compound polar-polar interaction anode lithium ion battery

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An E-PINN assisted practical uncertainty quantification for inverse problems

arXiv

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arXiv 2022年

作者： Jiang, Xinchao Wang, Xin Wen, Ziming Li, ENying Wang, Hu State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Beijing Institute of Technology Shenzhen Automotive Research Institute Shenzhen518000 China College of Mechanical & Electrical Engineering Central South University of Forestry and Technology 410082 Changsha China

How to solve inverse problems is the challenge of many engineering and industrial applications. Recently, physics-informed neural networks (PINNs) have emerged as a powerful approach to solve inverse problems efficiently. However, it is difficult for PINNs to quantify the uncertainty of results. Therefore, this study proposed ensemble PINNs (E-PINNs) to handle this issue. The E-PINN uses ensemble statistics of several basic models to provide uncertainty quantifications for the inverse solution based on the PINN framework, and it is employed to solve the inverse problems in which the unknown quantity is propagated through partial differential equations (PDEs), especially the identification of the unknown field (e.g., space function) of a given physical system. Compared with other data-driven approaches, the suggested method is more than straightforward to implement, and also obtains high-quality uncertainty estimates of the quantity of interest (QoI) without significantly increasing the complexity of the algorithm. This work discusses the good properties of ensemble learning in field inversion and uncertainty quantification. The effectiveness of the proposed method is demonstrated through several numerical experiments. To enhance the robustness of models, adversarial training (AT) is applied. Furthermore, an adaptive active sampling (AS) strategy based on the uncertainty estimates from E-PINNs is also proposed to improve the accuracy of material field inversion problems. Copyright © 2022, The Authors. All rights reserved.

关键词： Inverse problems

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An efficient method for computation of geodesic on b-spline surfaces 7

An efficient method for computation of geodesic on b-spline ...

引用

7th International Conference on Advances in Construction Machinery and vehicle engineering, ICACMVE 2019

作者： Peng, Zhang Jun, Xiong Long, Huang College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha410114 China Hunan Provincial Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha410114 China

ISBN: (纸本)9781728139050

A new algorithm is presented to compute geodesic on B-spline surfaces. At first, the principle of the algorithm is introduced in detail. The geodesic on the surface is traced in a simple way with a starting point and a starting direction as initial values. Then, three examples are delivered to test accuracy and efficiency of our algorithm. Experimental results indicate that the accuracy of our algorithm is comparable with that of Beck's approach, and at the same time our algorithm is faster than it. Furthermore, we do not need to solve the differential equations of geodesic which are quite complicated for B-spline surfaces. © 2019 IEEE.

关键词： Differential equations

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design and Fabrication of Artificial Brain Coral: Evolution Principle, Turbulent Hydrodynamics and Matter Interchange

SSRN

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SSRN 2022年

作者： Lin, Sen Chou, Nengzhuo Bao, Dingwen Zhang, Genbao Xiong, Chengwang Fang, Jie Xie, Yi Min State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Centre for Innovative Structures and Materials School of Engineering RMIT University GPO Box 2476 Melbourne3001 Australia School of Architecture and Urban Design RMIT University GPO Box 2476 Melbourne3001 Australia College of Civil Engineering Hunan City University Hunan Yiyang413000 China College of Shipbuilding Engineering Harbin Engineering University Harbin150001 China Beijing Institute of Control and Electronic Technology Beijing102308 China

This paper presents a systematic design of man-made brain corals via the methodology of solid isotropic material with penalization. The matter interchange resistance was minimized in the projected surface domain under volume and length constraints from the perspective of topological optimization. The optimized structures are akin to natural corals with intricate shapes, such as Platygyra , Goniastrea and Lobophyllia . In addition, computational fluid dynamics (CFD) simulations show that these human-made corals can provide shelter to protect polyps from ocean currents. To meet the requirements of batch production, an ultraviolet (UV)-curable resin model was first fabricated using the digital light processing (DLP) technique. Then, a silica gel reverse mold was prepared for casting models in cement and calcium carbonate. The mixture ratio was determined based on tests of workability and compressive strength. Ultimately, an acid corrosion test was conducted to verify the matter interchange capability of the optimized morphology. The results show that the brain folds contribute to the circulation of seawater, maintaining the concentration of nutrients and hindering the deposition of harmful substances. This research has established a new and effective methodology focuses on the creation of artificial brain corals, which is important for environmental restoration. © 2022, The Authors. All rights reserved.

关键词： Morphology

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Thermal network model and experimental validation for a motorized spindle including thermal–mechanical coupling effect

Research Square

引用

Research Square 2021年

作者： Zhou, Changjiang Qu, Zefeng Hu, Bo Li, Shengbo State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and Technology Changsha410114 China College of Mechanical and Vehicle Engineering Xiamen University of Technology Xiamen361024 China

Thermal deformation caused by temperature rise have an influence on the dynamic performance of a motorized spindle. In turn, the change in the dynamic performance will affect the temperature rise and thermal deformation of the system. However, the latter was rarely focused on in the previous literature. Therefore, a thermal network model of motorized spindle is enhanced by considering the thermal–mechanical coupling effect. Then, an iterative method is presented to solve the coupled equations, and a temperature test rig of the motorized spindle is set up to verify the proposed model. The relative error between the predicted and experimental results at two test points decreases by 9.56% and 3.44% after considering the thermal–mechanical coupling effect. The comparison with the experimental results shows that the proposed model with thermal–mechanical coupling effect can obtain a more accurate temperature field than the previous model. © 2021, CC BY.

关键词： Iterative methods

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Space Domain Based Cooperative and Adaptive Cruise Control for Enhanced Fuel Efficiency on Rolling Terrain

SSRN

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SSRN 2024年

作者： Lei, Mingyue Wang, Haoran Li, Duo Li, Zhenning Dhamaniya, Ashish Hu, Jia Key Laboratory of Road and Traffic Engineering of the Ministry of Education Tongji University 4800 Cao’an Road Shanghai China Department of Civil and Environmental Engineering University of California Los AngelesCA90024 United States State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Department of Civil and Geospatial Engineering Newcastle University Newcastle upon TyneNE1 7RU United Kingdom State Key Laboratory of Internet of Things for Smart City Departments of Civil and Environmental Engineering and Computer and Information Science University of Macau Avenida da Universidade Taipa China Transportation Engineering & Planning Section Department of Civil Engineering Sardar Vallabhbhai National Institute of Technology Gujarat Surat395007 India Key Laboratory of Road and Traffic Engineering of the Ministry of Education Institute for Advanced Study Tongji University 4800 Cao’an Road Shanghai China

Ecological Cooperative and Adaptive Cruise Control (Eco-CACC) is widely focused to enhance sustainability of CACC. However, state-of-the-art Eco-CACC studies are still facing challenges in adopting on rolling terrain. Furthermore, they cannot ensure both ecology optimality and computational efficiency. Hence, this paper proposes a nonlinear optimal control based Eco-CACC controller. It has the following features: i) enhancing performance across rolling terrains by modeling in space domain;ii) enhancing fuel efficiency via globally optimizing all vehicle's fuel consumptions;iii) ensuring computational efficiency by developing a differential dynamic programming-based solving method for the non-linear optimal control problem;iv) ensuring string stability through theoretically proving and experimentally validating. The performance of the proposed Eco-CACC controller was evaluated. Results showed that the proposed Eco-CACC controller can improve average fuel saving by 37.67% at collector road and about 17.30% at major arterial. © 2024, The Authors. All rights reserved.

关键词： Dynamic programming

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Anisotropy of thermal transport in phosphorene: A comparative first-principles study using different exchange-correlation functional

arXiv

引用

arXiv 2021年

作者： Zhang, Fa Zheng, Xiong Wang, Huimin Ding, Liang Qin, Guangzhao State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Hunan Key Laboratory for Micro-Nano Energy Materials & Device School of Physics and Optoelectronics Xiangtan University Hunan Xiangtan411105 China

Phosphorene, as a new type of two-dimensional (2D) semiconductor material, possesses unique physical and chemical properties, and thus has attracted widespread attention in recent years. With its increasing applications in nano/optoelectronics and thermoelectrics, a comprehensive study on its thermal transport properties is necessary. It has been concluded from previous studies that there exist vast difference and uncertainty in the theoretically predicted thermal conductivity, which is generally attributed to the selection of XC functional. However, there is no comprehensive investigation on this issue. In this paper, based on first-principles calculations using 12 different exchange-correlation (XC) functionals, the phonon transport properties of phosphorene are systematically studied by solving the Boltzmann transport equation (BTE). The results show noticeable differences in the phonon transport properties of phosphorene under different XC functionals. For instance, the thermal conductivity of phosphorene along the zigzag direction ranges from 0.51 to 30.48 Wm−1K-1, and that along the armchair direction ranges from 0.15 to 5.24 Wm−1K−1. Moreover, the anisotropy of thermal conductivity is between 3.4 and 6.9, which is fundamentally originated from the special hinge-like structure. This study conducts an in-depth analysis of phonon transport to reveal the effect and mechanism of different XC functionals for predicting thermal transport properties, which would provide a reference for future research on phosphorene and other novel materials. © 2021, CC BY.

关键词： Anisotropy

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Bacterial cellulose mixed with glass fiber as a separator to achieve long cycle life of aqueous zinc-ion batteries

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Journal of Energy Storage 2025年 129卷

作者： Yanming Huang Bin Wang Peng Xie Xinzhi Qiu Juanyun Li Chengjie Xin Jingyi Liu Ding Chen State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University 410082 Changsha China School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 201424 China

As sustainable energy storage candidates, aqueous zinc-ion batteries (AZIBs) demonstrate distinctive advantages in resource economics and inherent electrochemical stability, positioning them as viable post‑lithium solutions. However, the further application of AZIBs is hampered by the zinc anode's inherent drawbacks, including uncontrolled dendrite growth, parasitic hydrogen evolution reactions, and interfacial corrosion. To address these challenges, we fabricated a separator by blending bacterial cellulose with glass fibers (GF-BC separator), combining the advantages of both materials. The resulting separator exhibits superior mechanical strength, with a tensile strength of up to 45 MPa, which can prevent zinc dendrite penetration and control the crystal orientation during zinc deposition, promoting horizontal growth. Consequently, Zn||Zn symmetric batteries employing the GF-BC-50 separator demonstrate outstanding cycling stability (2750 h at 0.5 mA cm −2 and 360 h at 10 mA cm −2 ), and Zn||NaV₃O₈·1.5H₂O full batteries with the GF-BC-50 separator can 1000 cycles at 1 A g −1 while maintaining a capacity of 160 mAh g −1 . These findings provide a materials-by-design paradigm for next-generation AZIBs.

关键词： Separators

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