Journal of Physics: Conference Series最新文献

Research on predicting air resistance in complex pipelines with fans 带风机的复杂管道空气阻力预测研究

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2791/1/012033

Shengli Zhang, Zhichun Zeng, Yupei Sun, Long He, Changhao Wang

引用次数: 0

Stellar models with like-Wyman IIa complexity factor 具有类似韦曼 IIa 复杂因子的恒星模型

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2796/1/012007

J. Andrade, D. Andrade

引用次数: 0

Geometry-based multi-beam survey line layout problem 基于几何学的多波束测量线布局问题

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2791/1/012022

Chuangqi Li, Yuhang Wang, Fan Hu

引用次数: 0

Parameters of differential equations in four-flux and two-flux models approximated for scattering and absorption results on solar thermal collector black paints 太阳能集热器黑漆的散射和吸收结果近似的四流和二流模型微分方程参数

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2796/1/012018

David Barrios

{"title":"Parameters of differential equations in four-flux and two-flux models approximated for scattering and absorption results on solar thermal collector black paints","authors":"David Barrios","doi":"10.1088/1742-6596/2796/1/012018","DOIUrl":"https://doi.org/10.1088/1742-6596/2796/1/012018","url":null,"abstract":"\u0000 The intrinsic and extrinsic scattering and absorption coefficients of a thin black paint substrate used as a solar thermal collector, deposited on a thick glass substrate, were obtained in an approximated single-layer method, using the new solved equations recently determined from the collimated and diffuse differential equations of the four-flux model, for the intrinsic coefficients, and considering the differential equations of the two-flux model with total light intensities, for the extrinsic coefficients. In a first step, the optical constants were determined from the measurements of regular transmittance and specular reflectance, fitting them to the collimated transmittance and reflectance solutions of the four-flux model. In a second step, the intrinsic coefficients were obtained from the diffuse transmittance and reflectance measurements, considering four forward scattering ratios (for collimated and diffuse light intensities and for forward and backward light directions) and two average crossing parameters (for forward and backward light directions). In a third step, the extrinsic coefficients were obtained, using the new solved equations recently determined considering the total differential equations as the sum of the collimated and diffuse differential equations. Due to the approximated single-layer method, a simple rule of three was applied to the intrinsic and extrinsic results, relating the extinction coefficients calculated from the optical constants to those calculated from the collimated differential equations. The same external and internal diffuse interface reflectance was observed by integrating the collimated interface reflectance up to the critical angle of total internal reflection.","PeriodicalId":506941,"journal":{"name":"Journal of Physics: Conference Series","volume":"148 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141693122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Survey on Energy Methods for Vibroacoustic Analysis of Random Dynamic Systems and Applications 随机动态系统振动声学分析能量方法及其应用概览

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2796/1/012013

L. Andrade

{"title":"A Survey on Energy Methods for Vibroacoustic Analysis of Random Dynamic Systems and Applications","authors":"L. Andrade","doi":"10.1088/1742-6596/2796/1/012013","DOIUrl":"https://doi.org/10.1088/1742-6596/2796/1/012013","url":null,"abstract":"\u0000 Engineering can be considered a field of applied physics, as for the design of dynamic systems several aspects such as the strength, parameters of motion, among others, must be estimated for dimensioning, specifications of construction procedures, and operation. In the search for an appropriate model to estimate the dynamic response of a system to a prescribed input, several energy-based methods have been explored over the last decades to address three main issues. Firstly, it is quite rare that a solution for a purely analytical model exists, particularly for complex built-up structures. Secondly, numerical approaches to solve such complex equations of motion of a structure are computationally expensive. Lastly, even if a numerical or analytical solution can be found, there is no warranty that such estimation would be true for an ensemble of nominally identical built-up systems due to uncertainties that are not usually considered by the models. The aim of this work is to present a survey of existing approaches based on equations of energy rather than motion to simplify the computational process and include the effects of uncertainties in the dynamic response, and improvements to such models in regard of other engineering aspects. Additionally, several engineering applications are presented.","PeriodicalId":506941,"journal":{"name":"Journal of Physics: Conference Series","volume":"25 5part1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141702177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical and simulation study on the vibration modes of shear walls in prefabricated modular construction 预制模块化建筑中剪力墙振动模式的理论和模拟研究

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2791/1/012030

Va Kong, Xiaoguang Wang, Qiong Wang, Zhen Li, Hongbing Chen, Jiang Wang

{"title":"Theoretical and simulation study on the vibration modes of shear walls in prefabricated modular construction","authors":"Va Kong, Xiaoguang Wang, Qiong Wang, Zhen Li, Hongbing Chen, Jiang Wang","doi":"10.1088/1742-6596/2791/1/012030","DOIUrl":"https://doi.org/10.1088/1742-6596/2791/1/012030","url":null,"abstract":"\u0000 As prefabricated construction advances, the enhanced informatization and the industrialized modular construction method of MIC (Modular integrated construction) shear walls have been widely applied in real projects. MIC shear walls are generally made up of prefabricated wall modules with varying strength grades, using concrete of various ages, and are combined with cast-in-place concrete. Due to the unique construction requirements of these walls, defects such as interfacial delamination and internal voids might occur, arising from factors like concrete shrinkage and creep, complex interfacial structures, inadequate compaction during vibration, and construction process issues. Since these interfacial defects cannot be visually inspected from the exterior, developing non-destructive testing (NDT) methods specifically for detecting such defects in shear walls becomes an urgent necessity. This paper utilizes a combination of theoretical analysis and numerical simulation to explore the vibration modes of MIC shear walls with hidden defects. First, a theoretical model is proposed for the local vibration modes of MIC shear wall shells with consideration of interfacial delamination defects. Then, a numerical simulation model is established based on MIC shear wall construction and defect features to simulate the vibration behavior accurately. Finally, after examining the theoretical and simulated vibration characteristics of MIC shear walls, a significant theoretical foundation is established for identifying interfacial defects in MIC shear walls.","PeriodicalId":506941,"journal":{"name":"Journal of Physics: Conference Series","volume":"89 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141699345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reliability analysis and optimization of BGA solder based on finite element simulation 基于有限元模拟的 BGA 焊料可靠性分析与优化

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2791/1/012070

Ting Lei, Jiepeng Yang, Shizhang Liang

引用次数: 0

Simulation and verification of cylinder head’s temperature field for marine low-speed engine 船用低速发动机气缸盖温度场的模拟与验证

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2791/1/012023

Lei Hu, Yangfan Chen, Qiang Luo

{"title":"Simulation and verification of cylinder head’s temperature field for marine low-speed engine","authors":"Lei Hu, Yangfan Chen, Qiang Luo","doi":"10.1088/1742-6596/2791/1/012023","DOIUrl":"https://doi.org/10.1088/1742-6596/2791/1/012023","url":null,"abstract":"\u0000 The high load capacity of marine low-speed engines poses a challenge to the thermal load of the cylinder head and temperature field simulation can guide its structural design and optimization. The 3-dimensional models of the fluid domain for the cooling water and the solid domain for the cylinder head are established and meshed, the fluid domain model is simulated to research the heat transfer pattern by Fluent software, and the surface temperature and heat transfer coefficient of the cooling water is calculated. The thermal boundary conditions of the gas in the cylinder are simulated through the analysis of the engine working process. The temperature of the cylinder head is calculated based on the fluid-structure interaction model with the thermal boundary conditions by Workbench software. The validation of the model is carried out by comparing the simulated and measured temperature data in the heated inner wall of the cylinder head. The research results show that compared with the measured value, the error of simulation results is small, which shows that the model and method are reasonable. The temperature in the inner wall of the combustion chamber is low, which can provide possibilities to appropriately improve the power density of the low-speed engine and reduce the risk of low-temperature corrosion.","PeriodicalId":506941,"journal":{"name":"Journal of Physics: Conference Series","volume":"21 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141704005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation study on the impact of heat source intensity on the inhaled air quality of an innovative personalized air supply method 热源强度对创新型个性化供气方式吸入空气质量影响的模拟研究

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2791/1/012012

Zewei Ma

引用次数: 0

Simulation and analysis of short circuit fault in ship power system based on simulink 基于 simulink 的船舶动力系统短路故障模拟与分析

Journal of Physics: Conference Series Pub Date : 2024-07-01 DOI: 10.1088/1742-6596/2791/1/012054

Zhaoqiang Li, Haijun Yang, Lingling Wang, Wendong Ji

引用次数: 0