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Enhancing energy efficiency in shipping container house: A novel approach using hybrid louver systems

Energy and Built Environment 2024年

作者： Ibrahim, Adnan Alsukkar, Muna Dong, Yifang Saleem, Farrukh Hamza, Amir Hu, Peng Hu, MaoBin Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei230027 China Department of Architectural Engineering Faculty of Engineering The Hashemite University P.O. Box 330127 Zarqa13133 Jordan Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei China School of Engineering Science University of Science and Technology of China Hefei230026 China

Reusing shipping containers for residential purposes offers a promising approach to address global energy consumption challenges from economic and environmental perspectives. This study parametrically designed hybrid louver shadings by combining fixed vertical triangular slats with variable-depth horizontal rectangular slats, offering a novel approach to shading prefabricated buildings. The energy consumption, daylighting performance, and visual comfort were assessed for various shading configurations. Results indicated that implementing the proposed hybrid louvers, featuring fixed vertical triangular slats and variable-depth horizontal rectangular slats, significantly reduced Energy Use Intensity (EUI) to 133.95 kWh/m2. Moreover, Useful daylight illuminance (UDI), Daylight Autonomy (DA), and Glare Autonomy (GA) values improved to 95.38%, 89.97%, and 91.16%, respectively. The study highlighted the potential of the proposed shading system to significantly reduce overall energy consumption across various ASHRAE climate zones, including Miami (1A), Guangzhou (2A), Melbourne (3C), Esperance (3C), San Diego (3A), and Milan (4A). Notably, energy reductions of up to 50.2% were projected for climates such as Miami (1A) and San Diego (3A). Furthermore, container buildings in warm climate zones exhibited a significantly lower EUI range of 76.58 to 91.95 kWh/m². This study underscores the transformative potential of hybrid louver systems in promoting the widespread adoption of sustainable residential architecture, contributing to global sustainability efforts. © 2024 Southwest Jiatong University

关键词： Daylighting

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A Scheme of Digital Twin Air Combat Battlefield and Digital Twin Model design

A Scheme of Digital Twin Air Combat Battlefield and Digital ...

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Chinese Control and Decision Conference, CCDC

作者： Yi Hu Fangqi Zhang Yuanjing Ma Chinese Academy Sciences Shenyang Institute of Computing Technology University of Chinese Academy Sciences Shenyang China Chinese Academy Sciences Shenyang Institute of Computing Technology University of Chinese Academy Sciences Aviation Key Laboratory of Science and Technology on Air Combat System AVIC Shenyang Aircraft Design and Research Institute Shenyang China School of Science Shenyang Ligong University Shenyang China

ISBN: (数字)9798350387780

ISBN: (纸本)9798350387797

This paper provides a solution concept using digital twin technology for the battlefield environment for the air combat training. The scheme is divided into two aspects: digital twin battlefield and digital twin aircraft. The digital twin battlefield scheme discusses the three-dimensional modeling method of the battlefield and the update mechanism of battlefield environment data. The digital twin aircraft model scheme discusses the construction ideas of the aircraft twin model, and discusses the future application scenarios. With the advancement of technology and the iterative update of application scenarios, the digital twin air combat training battlefield will gradually realize various functions and explore more innovative application modes, realize the virtual environment interaction and digital twin function application of the entire battlefield environment.

关键词： Training Solid modeling Atmospheric modeling Virtual environments Data models Digital twins Aircraft manufacture

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Optimal Spatial-Temporal Triangulation for Bearing-Only Cooperative Motion Estimation

arXiv

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arXiv 2023年

作者： Zheng, Canlun Mi, Yize Guo, Hanqing Chen, Huaben Lin, Zhiyun Zhao, Shiyu College of Computer Science and Technology Zhejiang University Hangzhou China WINDY Lab Department of Artificial Intelligence Westlake University Hangzhou China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Peng Cheng Laboratory Shenzhen China

Vision-based cooperative motion estimation is an important problem for many multi-robot systems such as cooperative aerial target pursuit. This problem can be formulated as bearing-only cooperative motion estimation, where the visual measurement is modeled as a bearing vector pointing from the camera to the target. The conventional approaches for bearing-only cooperative estimation are mainly based on the framework of distributed Kalman filtering (DKF). In this paper, we propose a new optimal bearing-only cooperative estimation algorithm, named spatial-temporal triangulation, based on the method of distributed recursive least squares. The design of the algorithm fully incorporates all the available information and the specific triangulation geometric constraint. As a result, the algorithm has superior estimation performance than the state-of-the-art DKF algorithms in terms of both accuracy and convergence speed as verified by numerical simulation. We rigorously prove the exponential convergence of the proposed algorithm. Moreover, to verify the effectiveness of the proposed algorithm under practical challenging conditions, we develop a vision-based cooperative aerial target pursuit system, which is the first of such fully autonomous systems up to now to the best of our knowledge. © 2023, CC BY.

关键词： Triangulation

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Revealing the Correlation between Microstructure and Fatigue Crack Growth Behaviors in Ti-6al-3nb-2zr-1mo Alloy

SSRN

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SSRN 2022年

作者： Yang, Pengfei Sun, Qi Zheng, Xuechao Mi, Xue Chai, Linjiang Zhu, Minhao Tribology Research Institute School of Mechanical Engineering Southwest Jiaotong University Chengdu China School of Material Science and Engineering Southwest Jiaotong University Chengdu China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China School of Materials Science and Engineering Chongqing University of Technology Chongqing China

In the current work, the correlation between microstructural features and fatigue crack growth (FCG) behaviors in Ti-6Al-3Nb-2Zr-1Mo alloy is investigated by a combination of electron backscatter diffraction (EBSD), electron channeling contrast (ECC) and mechanical tests. Three kinds of specimens with different microstructures are prepared by water quenching (WQ), air cooling (AC) and furnace cooling (FC) after isothermal holding for 1h in α+β phase region of the as-received material. The da/dN-ΔK curves indicate that the FCG resistance ability of AC specimen is the worst, resulting in the highest FCG rate. The corresponding FCG paths of these specimens are also examined systematically. And the results show that the crack bifurcation and deflection in both WQ and FC specimens are more serious than that in AC specimen. For the specimen with WQ microstructure, boundaries with high angle misorientation angles between different α variants transformed from β phase may act as an obstacle to hinder the dislocation movement and slip transfer, favoring the secondary crack initiation. Similarly, the strain incompatibility generated at the boundaries between different α phases in FC specimen may also promote the occurrence of crack bifurcation. In contrast, in AC specimen, α colonies that contains α variants with the same crystal orientation are more likely to be formed inside β transformation grains leading to few secondary cracks formed. Furthermore, a modified mathematical model is developed to evaluate the co-effect of the crack deflection and bifurcation on the FCG rate. It is suggested that the crack bifurcation is the main factor that can effectively reduce the stress intensity factor of the main crack tip, and in turn slow down the FCG rate. © 2022, The Authors. All rights reserved.

关键词： Titanium alloys

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Line laser measurement, evaluation and utilization of holistic gear deviations

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Measurement: Sensors 2025年 38卷

作者： Shi, Zhaoyao Sun, Yanqiang Yu, Bo Wang, Xiaoyi Zhao, Baoya Beijing Engineering Research Center of Precision Measurement Technology and Instruments Beijing University of Technology Beijing China School of Construction Machinery Shandong Jiaotong University Shandong Jinan China Henan Key Laboratory of Mechanical Design and Transmission System Henan University of Science and Technology Luoyang China School of Mechatronics Engineering North China Institute of Aerospace Engineering Langfang China

The measurement of holistic gear deviations (HGD) is a fast-developing field of gear measurement technology in recent years. Line laser measurement is an effective approach to measure the HGD, and is beginning to be applied. However, compared with the mature conventional gear measurement based on "point" and "line" measurement, the holistic gear deviations measurement is imperfect, especially in acquisition, evaluation and utilization. This paper introduces the line laser measurement model of HGD and puts forward the solutions to the problems such as the determination of the position and attitude parameters of the laser sensor, the influence of the incident angle of the measuring light, and the occlusion of the adjacent gear teeth in the measurement. The representation method of the three-dimensional deviations of the tooth flank is illustrated. According to the HGD, a unified model for calculating the elemental deviations of the gear, such as the involute and helix, is found. The HGD evaluation system is established by means of the statistical analysis method. The full use of the HGD is explored from two aspects of gear process error analysis and gear performance prediction, including tooth flank twist analysis, calculation of gear integrated error (GIE) and transmission error (TE), matching method of large batch of gears, etc. The analysis system of HGD is built on the cloud platform. The measurement, evaluation and utilization of HGD are the key technologies of the next generation gear measurement. © 2025

关键词： Metrology Gear Holistic gear deviations

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Sound propagation characteristic of phononic crystals pipeline with periodic vibration isolation mass

Sound propagation characteristic of phononic crystals pipeli...

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2020 Transactions of the American Nuclear Society, ANS 2020

作者： Zeng, Qingna Wang, Donghui Zang, Fenggang Zhang, Yixiong Jiang, Xiaozhou Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China 328# 1st section Changshun Dadao Avenue Chengdu610213 China

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Modeling, simulation and experiment of an origami robot with a coupled bar-hinge mechanism

Modeling, simulation and experiment of an origami robot with...

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Fully Actuated system Theory and Applications (CFASTA), Conference on

作者： Junpeng Mai Hanzhao Shao Shaojie Liu Yuanzhuo Zhang Liangming Chen Huijuan Feng School of System Design and Intelligent Manufacturing and Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and Technology Shenzhen P. R. China Department of Electronic and Electrical Engineering Southern University of Science and Technology Shenzhen P. R. China Department of Mechnical and Energy Engineering Southern University of Science and Technology Shenzhen P. R. China

ISBN: (数字)9798350373691

ISBN: (纸本)9798350373707

This paper aims to analyze the motion behavior of an origami robot with a coupled bar-hinge mechanism. By disassembling the planar six-hinge mechanism into two planar four-hinge mechanisms with coupled motion, this paper derives the kinematics of the planar six-hinge mechanism based on the algebraic differential kinematics of the planar four-hinge motions. The rotational angle change and the moving step length of the origami robot are further calculated. Finally, the theoretical motion model is verified with the motion simulation data of the planar six-hinge mechanism origami robot in SolidWorks and the experimental data of the physical model. This verification proves the feasibility of the theoretical analysis, simulation model, and physical model.

关键词： Solid modeling Analytical models Prototypes Kinematics Three-dimensional printing Mathematical models Data models

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Predicting Reverse Flow Characteristics in Equal-Height-Difference Passive Heat Removal system for Ocean Nuclear Power

SSRN

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SSRN 2022年

作者： Wang, Zhiwei He, Yanping Duan, Zhongdi Huang, Chao Li, Mingzhi Liu, Shiwen Hao, Chengming State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai200240 China Institute of Marine Equipment Shanghai Jiao Tong University Shanghai200240 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

The equal-height-difference passive heat removal system (EHDPHRS) via natural circulation driving and utilizes ocean as infinite heat sink for heat dissipation, showing broad application prospect in ocean nuclear power field;but the heat removal pipe normally encounters the reverse flow of the cold seawater into the pipe, leading to operation instability and even condensation-induced water hammer. In this study, the integration of the volume of fluid model and the condensation model based on surface renewal theory is used to simulate the reverse flow characteristics in heat removal pipe under single-and two-phase natural circulation conditions. The interfacial heat and mass transfer are calculated by user-defined functions. The numerical results reveal that the buoyancy force ( [[EQUATION]] ) and condensation driving force ( [[EQUATION]] ) both accelerate the reverse flow, while the inertial force ( [[EQUATION]] ) restrains the reverse flow;the reverse flow length presents monotonous decrease with increasing flow velocity under single-phase conditions and parabolic-like trend for two-phase flow. A prediction correlation for reverse length is developed using dimensionless Reynolds number, Grashof number and vapor volume fraction, covering single- and two-phase conditions. The predicted reverse length by the correlation agrees with 94% of the results within deviations of [[EQUATION]] 15%. © 2022, The Authors. All rights reserved.

关键词： Forecasting

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Joint design of Radar Receive Filter and Unimodular ISAC Waveform with Sidelobe Level Control

arXiv

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arXiv 2025年

作者： Zhang, Kecheng Liu, Ya-Feng Wang, Zhongbin Yuan, Weijie Keskin, Musa Furkan Wymeersch, Henk Xia, Shuqiang School of System Design and Intelligent Manufacturing The Shenzhen Key Laboratory of Robotics and Computer Vision Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China Department of Electrical Engineering Chalmers University of Technology Gothenburg41296 Sweden ZTE Corporation The State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen518055 China

Integrated sensing and communication (ISAC) has been considered a key feature of next-generation wireless networks. This paper investigates the joint design of the radar receive filter and dual-functional transmit waveform for the multiple-input multiple-output (MIMO) ISAC system. While optimizing the mean square error (MSE) of the radar receive spatial response and maximizing the achievable rate at the communication receiver, besides the constraints of full-power radar receiving filter and unimodular transmit sequence, we control the maximum range sidelobe level, which is often overlooked in existing ISAC waveform design literature, for better radar imaging performance. To solve the formulated optimization problem with convex and nonconvex constraints, we propose an inexact augmented Lagrangian method (ALM) algorithm. For each subproblem in the proposed inexact ALM algorithm, we custom-design a block successive upper-bound minimization (BSUM) scheme with closed-form solutions for all blocks of variable to enhance the computational efficiency. Convergence analysis shows that the proposed algorithm is guaranteed to provide a stationary and feasible solution. Extensive simulations are performed to investigate the impact of different system parameters on communication and radar imaging performance. Comparison with the existing works shows the superiority of the proposed algorithm. © 2025, CC BY-NC-SA.

关键词： Mean square error

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Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces

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Case Studies in Thermal Engineering 2025年 72卷

作者： Xue Zhang Wenpei Feng Xiaolong Yang Hongxing Yu Jian Deng Sijia Du Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China

This study investigates the impact of roughness elements on fluid flow and heat transfer characteristics in narrow rectangular channels. The results show that when the fluid flows over roughness elements, it induces vortices near the wall, disturbing the flow and heat transfer boundary layers. This enhances heat transfer while simultaneously increasing flow resistance. Among different roughness types, cylindrical roughness elements demonstrate a more substantial improvement in both heat transfer efficiency and friction factor compared to cubic elements. The Nusselt number is found to be non-monotonic related to the height of the roughness elements, while the friction factor increases with height. Additionally, larger roughness element diameters lead to higher Nusselt numbers and friction factors. Further analysis reveals that under conditions where the spacing and height remain unchanged, an increase in the roughness elements quantity results in a diminished enhancement of heat transfer. The base edge length of the roughness elements has a more significant impact on heat transfer capacity than the additional heated area, while the additional area primarily affects the flow resistance, causing the friction factor to increase with the number of roughness elements.

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