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Effect of solar radiation on human thermal sensation and physiological parameters in a convection–radiation air conditioning environment

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Building Simulation 2024年第8期17卷 1359-1377页

作者： Guanyu Li Dong Liu Anjie Hu Qidong Yan Lina Ma Liu Tang Xiaozhou Wu Jun Wang Zhenyu Wang School of Civil Engineering and Architecture Southwest University of Science and TechnologyMianyang 621010China Sichuan Province Engineering Technology Research Center of Healthy Human Settlement Chengdu 610065China Sichuan University Engineering Design&Research Institute Co.Ltd Chengdu 610065China School of Civil Engineering Dalian University of TechnologyDalian 116081China College of Architecture and Environment Sichuan UniversityChengdu 610065China School of Environment and Resources Southwest University of Science and TechnologyMianyang 621010China

This study focused on the effect of glass structures of modern architecture on the indoor thermal environment during *** particular,this study examined how solar radiation significantly altered people’s thermal *** tests on convection–radiation air conditioning systems were conducted,encompassing 12 different scenarios,including diverse indoor open areas,terminal forms,and levels of solar *** tests aimed to explore the physiological and psychological responses of the human body to solar radiation penetrating through windows into the inner *** the experiments,the participants’subjective thermal sensations and thermal comfort were recorded,along with continuous monitoring of their physiological and environmental *** showed that solar radiation significantly increased local skin temperature,with a maximum rise of 2.15℃.Operative temperature is a reliable indicator of human skin temperature and thermal sensation vote(TSV).This study established two models that could predict the skin temperature of individuals indoors through operative temperature under conditions without or with solar radiation,and identified sensitive ranges of operative temperature for both models,to be specific,26.32℃to 28.43℃and 28.51℃to 34.11℃,***,this study established the relationship between skin temperature and TSV under conditions with and without solar *** results indicate that solar radiation enhances the human body’s adaptability to indoor environmental parameters;a convection–radiation system(FC+RF)could be used to optimize indoor thermal control under solar radiation,achieving more stable environmental temperatures and improved indoor comfort.

关键词： system modeling solar radiation mean skin temperature thermal comfort terminal form irradiation area

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Restraint effect of partition wall on the tunnel floor heave in layered rock mass

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Journal of Mountain Science 2024年第7期21卷 2462-2479页

作者： YANG Yunyun HUANG Da ZHONG Zhu LIU Yang PENG Jianbing School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China College of Geology Engineering and Geomatics Chang’an UniversityXi’an 710054China College of Civil Engineering&Architecture China Three Gorges UniversityYichang 443002China.

The presence of horizontal layered rocks in tunnel engineering significantly impacts the stability and strength of the surrounding rock mass,leading to floor heave in the *** study focused on preparing layered specimens of rock-like material with varying thickness to investigate the failure behaviors of tunnel *** results indicate that thin-layered rock mass exhibits weak interlayer bonding,causing rock layers near the surface to buckle and break upwards when subjected to horizontal *** an increase in the layer thickness,a transition in failure mode occurs from upward buckling to shear failure along the plane,leading to a noticeable reduction in floor heave *** primary cause of significant deformation in floor heave is upward buckling *** address this issue,the study proposes the installation of a partition wall in the middle of the floor to mitigate heave deformation of the rock *** results demonstrate that the partition wall has a considerable stabilizing effect on the floor,reducing the zone of buckling failure and minimizing floor heave *** is crucial for the partition wall to be sufficiently high to prevent buckling failure and ensure *** simulation calculations on an engineering example,it is confirmed that implementing a partition wall can effectively reduce floor heave and enhance the stability of tunnel floor.

关键词： Layered rock Floor heave Horizontal compression test Failure behavior Partition wall

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Experimental Study on Effect of Inclination Angle on Bubble Collapse near Attached Air Bubble

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China Ocean engineering 2023年第5期37卷 753-767页

作者： WANG Jia-xia WU Shi-zeng LIU Kun JIANG Ming-zuo WANG Zi-li School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China College of Automation Jiangsu University of Science and TechnologyZhenjiangJiangsu 212003China

Experiments were conducted to investigate the dynamics of an oscillating bubble generated by a spark in the presence of an inclined attached air *** study primarily focused on the influence of the inclination angle on the behavior of bubble jetting orientation,air bubble shape modes,and motion characteristics of the interaction between the two *** complex bubble jetting behaviors were observed,including the presence of multiple types of bubble jetting directions,bubble splitting,and multidirectional *** types of air bubble shapes were defined,namely inclined cup cover-shaped(with and without splitting),double-peaked cup cover-shaped,and inclined L-shaped air *** formation of different types of bubble jets was analyzed using the vector synthesis principle of the Bjerknes force exerted by the inclined attached air bubble and a steel *** describe the diverse orientations of bubble jetting and air bubble shapes,new parameters namely the dimensionless spark bubble oscillation time T^(*)and volume ratio V^(*)that consider the inclination angle are *** findings of this investigation contribute to the existing knowledge and have the potential to further enhance methods for mitigating cavitation damage in marine,hydraulic machinery systems,and medical fields.l fields.

关键词： spark-generated bubble experiment inclination angle bubble jet air bubble shape bubble dynamics

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Numerical Simulation Evaluation on Airflow Organization and Thermal Comfort of Air-Conditioning System Based on Internet of Things technology 8th

Numerical Simulation Evaluation on Airflow Organization and ...

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8th International Conference on Energy and Environmental Science, ICEES 2024

作者： Zhang, Huijuan Huang, Tao Tan, Jinlan Yuan, Long College of Architecture and Civil Engineering Chongqing Metropolitan College of Science and Technology Chongqing402160 China

ISBN: (纸本)9783031639005

With the emergence of computers, the Internet and mobile communication networks, the rise and development of Internet of Things technology has become the main content of the third technological revolution. Based on multimedia technology, this paper discussed the use of multimedia technology to simulate the air distribution and thermal comfort of office air conditioners, and analyzed the thermal comfort values of air conditioners in the office working environment. Therefore, this paper proposed an intelligent air-conditioning system architecture based on the Internet of Things, which combined the Internet of Things technology with cloud computing platform and big data technology, and used CFD software to study the air-conditioning system. The test results showed that in the vertical cabinet air-conditioned office, when the air is supplied in the horizontal direction, the satisfaction of the indoor workbench is 50%;in the process of air supply at 60°, the satisfaction rate reaches 75%;when the air supply angle is 45°, the satisfaction rate reaches 100%. Therefore, the direction of air supply was selected to be 45°. At this angle, the thermal comfort of all parts is very good, and there is no waste. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Air conditioning

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Numerical Simulation of Sea Ice and Structure Interaction Using Common Node DEM-SPH Model

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China Ocean engineering 2023年第6期37卷 897-911页

作者： SHEN Zhong-xiang WANG Wen-qing XU Cheng-yue LI Hong-bin JIANG Yin LIU Ren-wei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

In this work,a novel fluid-structure coupling method called the common node discrete element-smoothed particle hydrodynamics(DS-SPH)method is *** framework combines the principles of the common node discrete element method(DEM)and smoothed particle hydrodynamics(SPH)to construct DEM-SPH particles situated on the same *** doing so,the DEM particles can interact with the SPH particles within their support domain,enabling fluid-structure interaction(FSI).To determine the DEM microscopic parameters required for this method,uniaxial compression and three-point bending tests are conducted on sea *** verify the proposed model,we select the interaction between sea ice and structures as a case *** simulation,the model's capability of accurately depicting sea ice deformation and fracture has been *** results indicate that the inclusion of SPH particles with fluid properties in the DEM model has minimal impact on the main mechanical parameters of sea ***,it helps prevent the occurrence of particle splashing during cement ***,it is observed that the size of DEM particles and the friction between DEM particles and the structure significantly influence the macroscopic mechanical behavior of the common-node DEM-SPH ***,we compare the fracture behavior of sea ice and the ice forces acting on structures obtained from the current model with on-site measured *** agreement between the two sets of data is excellent,further validating the effectiveness of the proposed model in practical applications.

关键词： common node DEM-SPH uniaxial compression three-point bending structure-ice interaction

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Fluid-solid coupling numerical simulation of micro-disturbance grouting treatment for excessive deformation of shield tunnel

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Underground Space 2024年第6期19卷 87-100页

作者： Yanjie Zhang Zheng Cao Chun Liu Hongwei Huang College of Civil Engineering and Architecture Henan University of TechnologyZhengzhou 450001China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

Micro-disturbance grouting is a recovery technique to reduce the excessive deformation of operational shield tunnels in urban *** grout mass behaves as a fluid in the ground before hardening to form a grout–soil mixture,which highlights the necessity of using fluid–solid coupling method in the simulation of grouting *** a discrete element modeling environment,this paper proposes a novel fluid-solid coupling method based on the pore density flow *** demonstrate the effectiveness of this method,it is applied to numerical simulation of micro-disturbance grouting process for treatment of large transverse deformation of a shield tunnel in Shanghai Metro,*** simulation results reveal the mechanism of recovering tunnel convergence by micro-disturbance grouting in terms of compaction and fracture of soil,energy analysis during grouting,and mechanical response of soil-tunnel interaction ***,the influence of the three main grouting parameters(i.e.,grouting pressure,grouting distance,and grouting height)on tunnel deformation recovery efficiency is evaluated through parametric *** order to efficiently recover large transverse deformation of shield tunnel in Shanghai Metro,it is suggested that the grouting pressure should be about 0.55 MPa,the grouting height should be in the range of 6.2–7.0 m,and the grouting distance should be in the range of 3.0–3.6 *** results provide a valuable reference for grouting treatment projects of over-deformed shield tunnel in soft soil areas.

关键词： Fluid-solid coupling Discrete element method Pore density flow Micro-disturbance grouting Soil-tunnel interaction

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A hybrid feature recognition method based on Loop Attributed Adjacency Graph and based on hint 4

A hybrid feature recognition method based on Loop Attributed...

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4th International Conference on Advanced Manufacturing technology and Electronic Information, AMTEI 2024

作者： Fu, Peng Mechanical & Electrical Engineering College Xi’an University of Architecture and Technology Xi’an710055 China

ISBN: (数字)9781510688247

ISBN: (纸本)9781510688230

Aiming at intersecting feature recognition, this paper presents a classification method of intersecting feature. Intersecting feature can be classified as multi-loop intersecting feature and hybrid loop intersecting feature according to topological constitution. On this basis, this paper presents a hybrid feature recognition method based on Loop Attributed Adjacency Graph and hint. The theory of this method is decomposing Attribute Adjacent Graph using base surface decomposition and sub-graph matching. Using this method, feature recognition can be implemented: First, after the base-face was obtained, the Loop Attributed Adjacency Graph for each loop of the base-face was established to decompose the Attribute Adjacent Graph. Second, every Loop Attributed Adjacency Graph was judged for hybrid loop intersecting feature: If the sub-graph doesn’t contain hybrid loop intersecting feature, it will be recognized by sub-graph matching. If not, the sub-graph will be recognized by the method based on hint. Boundary test and feature test were introduced to confirm the correctness of feature recognition. Intersecting feature can be recognized by iterating the method. © 2025 SPIE.

关键词： Graph theory

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Building Structure Safety Assessment System Based on Deep Learning 3

Building Structure Safety Assessment System Based on Deep Le...

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3rd International Conference on Integrated Circuits and Communication Systems, ICICACS 2025

作者： Tian, Zhiying Wang, Xiaowei Li, Xiaolong Liu, Wenhang Wang, Jiaqi School of Architecture and Civil Engineering Chongqing Metropolitan College of Science and Technology Chongqing China

ISBN: (纸本)9798331508456

In the construction industry, traditional structural safety assessment methods often rely on manual inspection and empirical judgment, which are inefficient and error-prone. This paper aims to establish a building structure safety assessment system based on LSTM. First, a large amount of building structure data is collected, including material strength, stress distribution, historical damage records and environmental factors, and the data is preprocessed and feature engineered to ensure the quality and validity of the data. Next, the LSTM model is used to conduct classification and regression analysis for structural safety. Cross-validation and hyperparameter adjustment are used during the training process to optimize model performance. The system's accuracy in structural safety assessment reaches 98.4%, and the assessment time is the shortest 2.8 seconds. Assessment systems based on deep learning can significantly improve the efficiency and accuracy of building structure safety assessments, providing important support for the intelligent development of the construction industry. © 2025 IEEE.

关键词： Building materials

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Failure characteristics and fracture mechanism of overburden rock induced by mining:A case study in China

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International Journal of Coal Science & technology 2024年第3期11卷 241-255页

作者： Jiawei Li Meng Zhang Changxiang Wang Changlong Liao Baoliang Zhang Department of Energy and Power Engineering College of Mechanical and Transportation EngineeringChina University of Petroleum(Beijing)BeijingChina Department of Energy and Power Engineering Tsinghua UniversityBeijingChina College of Safety Science and Engineering Anhui University of Science and TechnologyHuainan232000China School of Architecture and Civil Engineering Liaocheng UniversityLiaocheng252000China

This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's *** caving area of the overburden rock is divided into three zones:the delamination fracture zone,broken fracture zone,and compaction *** caving and fracture zones'heights are approximately 110 m above the coal seam,with a maximum subsidence of 11 *** delamination fracture zone's porosity range is between 0.2 and 0.3,while the remainder of the roof predominantly exhibits a porosity of less than *** addition,the numerical model's stress analysis revealed that the overburden rock's displacement zone forms an'arch-beam'structure starting from 160 m,with the maximum and minimum stress values decreasing as the distance of advancement *** the stress beam interval of the overburden rock,the maximum value changes periodically as the advancement distance *** on a comparative analysis between observable data from on-site work and numerical simulation results,the stress data from the numerical simulation are essentially consistent with the actual results detected on-site,indicating the validity of the numerical simulation results.

关键词： Fracture development characteristics Similar simulation experiment Layer porosity Discrete element numerical simulation

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Structural Health Monitoring of Thin Shell Structures

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International Journal of Mechanical System Dynamics 2025年第1期5卷 20-39页

作者： Ihtisham Khalid Zahid Ahmed Qureshi Faisal Siddiqui Selda Oterkus Erkan Oterkus Department of Aerospace Engineering College of Aeronautical EngineeringNational University of Sciences&TechnologyIslamabadPakistan Department of Naval Architecture Ocean&Marine EngineeringUniversity of StrathclydeGlasgowScotlandUK

Thin plate and shell structures are extensively used in aerospace,naval,and energy sectors due to their lightweight and efficient load-bearing *** Health Monitoring(SHM)implementations are becoming increasingly important in these industries to reduce maintenance costs,improve reliability,and ensure safe *** study presents an efficient triangular inverse shell element for thin shell structures,developed using discrete Kirchhoff assumptions within the inverse finite element method(iFEM)*** proposed inverse formulation is efficient and requires fewer strain sensors to achieve accurate and reliable displacement field reconstruction than existing inverse elements based on the First Order Shear Deformation Theory(FSDT).These features are critical to iFEM-based SHM strategies for improving real-time efficiency while reducing project *** inverse element is rigorously validated using benchmark problems under in-plane,out-of-plane,and general loading ***,its performance is compared to an existing competitive inverse shell element based on *** inverse formulation is further evaluated for robust shape-sensing capability,considering a real-world structural configuration under a practicable sparse sensor *** investigation includes defect characterization and structural health assessment using damage index *** research contributes toward developing more reliable and cost-effective monitoring solutions by highlighting the potential application of the proposed inverse element for SHM frameworks designed for thin shell structures.

关键词： defect iFEM inverse shell element shape sensing structural health monitoring thin plate and shell

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