检索结果-内蒙古大学图书馆

Sublimation of composite ice and its influence on performance of ice shells

International Journal of Space structures 2021年第1期36卷 67-77页

作者： Wu, Yue Huang, Junkai Chen, Jiafeng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China China Academy of Building Research Co. Ltd Beijing China

The long-span ice composite shell structure is a new type of ice and snow structure developed in recent years. The engineering practice of ice composite shell shows that sublimation is one of the important reasons for its damage and even collapse. In this paper, we firstly supplemented the existing H-K equation and obtained the revised ice sublimation equation through indoor evaporative plate experiment considering the influence of admixtures and wind speed. Afterwards, combining the simulations of solar radiation and CFD, the numerical simulation of sublimation distribution on the surface of were realized by programming in Grasshopper platform. During sublimation, the thickness of the ice composite shell decreases by 0.38 mm every 10 days and the sublimation rate on the sunny side was 1.7 times that on the shady side. Finally, the static performance and stability of the sublimated ice composite spherical shell were analyzed. After 70 days of sublimation, the thickness of the ice composite shell structure becomes thinner and uneven, which leads its sensitivity to external load increases. © The Author(s) 2021.

关键词： Ice

来源：评论

学校读者我要写书评

暂无评论

Experimental and Numerical Study on dynamic Responses of a Tlp-Type Modular Floating Structure System

SSRN

引用

SSRN 2024年

作者： Li, Yanwei Ren, Nianxin Cai, Wenyu Liu, Yaqiong Ou, Jinping School of Marine Science and Engineering Hainan University Haikou570228 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou570228 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education China

This paper explores a proposed TLP-type modular floating structure system, incorporating both central TLP modules and peripheral floating artificial reef modules. The outermost floating artificial reef module can function as a floating breakwater, and also serving as a habitat for surrounding marine organisms. Both scale model tests (1:80) and time-domain numerical simulations were performed. The simulations accounted for hydrodynamic interactions among the bodies and the mechanical coupling effects. During the scale model test, a survival strategy has been proposed to prevent collision risks between reef modules and adjacent TLP modules. A preliminary stiffness recommendation was suggested by a trade-off between the pitch of the reef module and the spring force. Numerical and experimental results have been widely compared and discussed. A good agreement has been achieved, although responses are slightly overestimated by numerical simulation due to the neglect of the viscous damping effect. In addition, the responses of the proposed system, connected with and without the outermost floating artificial reef module, have been compared and analyzed. The results suggest that the connection of the reef module can significantly reduce the system's surge response and enhance its survivability under severe sea conditions. © 2024, The Authors. All rights reserved.

关键词： dynamic response

来源：评论

学校读者我要写书评

暂无评论

The role of fluctuations in the nucleation process

arXiv

引用

arXiv 2025年

作者： Deng, Yuanpeng Kang, Peilin Xu, Xiang Li, Hui Parrinello, Michele Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China Atomistic Simulations Italian Institute of Technology Genova16156 Italy

The emergence upon cooling of an ordered solid phase from a liquid is a remarkable example of self-assembly, which has also major practical relevance. Here, we use a recently developed committor-based enhanced sampling method [Kang et al., Nat. Comput. Sci. 4, 451-460 (2024);Trizio et al., arXiv:2410.17029 (2024)] to explore the crystallization transition in a Lennard-Jones fluid, using Kolmogorov’s variational principle. In particular, we take advantage of the properties of our sampling method to harness a large number of configurations from the transition state ensemble. From this wealth of data, we achieve precise localization of the transition state region, revealing a nucleation pathway that deviates from idealized spherical growth assumptions. Furthermore, we take advantage of the probabilistic nature of the committor to detect and analyze the fluctuations that lead to nucleation. Our study nuances classical nucleation theory by showing that the growing nucleus has a complex structure, consisting of a solid core surrounded by a disordered interface. We also compute from the Kolmogorov’s principle a nucleation rate that is consistent with the experimental results at variance with previous computational estimates. Copyright © 2025, The Authors. All rights reserved.

关键词： Nucleation

来源：评论

学校读者我要写书评

暂无评论

Distributed real-time in-situ monitoring method for deformation measurement of landslide 8

Distributed real-time in-situ monitoring method for deformat...

引用

8th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Liu, Weikang Zhou, Wensong Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Landslide disasters often cause huge property losses and casualties. Therefore, distributed real-time landslide deformation monitoring is of great significance to ensure the safety of people's lives and property, and the stability evaluation of landslide. Ultra-weak fiber Bragg grating (UWFBG) sensing technology can realize the measurement distance of 20 km for single optical fiber, and the single measurement time is less than 1 s. Therefore, it has the potential of distributed real-time monitoring. In this work, a novel distributed real-time landslide deformation monitoring method based on UWFBG was proposed. And this method was applied to a real landslide in Yibin City, Sichuan Province, China, to monitor its deformation in situ. The feasibility of the monitoring method was verified and the landslide deformation was analyzed. The in-situ monitoring results show that on the time scale, the local deformation of the landslide is gradually increasing;on the spatial scale, there are some points with large local deformation, but the overall deformation in the monitoring area is small. The monitored results also suggest that the landslide is in a stable state during the monitoring period. © 2022 SPIE

关键词： Landslides

来源：评论

学校读者我要写书评

暂无评论

Energy Harvesting of Novel Smart Concrete Based on Nanotechnology: Experimental and Numerical

SSRN

引用

SSRN 2023年

作者： Zhang, Mingming Zhu, Lihua Gao, Shan Yuan, Hanquan Liu, Tong School of Civil Engineering Xi’an University of Architecture and Technology Shaanxi Xi’an710055 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

This paper focuses on energy harvesting and smart controls in concrete structures using both experimental and theoretical approaches. The growing demand for sustainable energy solutions has led to innovations in materials like concrete, which offer energy conversion and efficient control possibilities. This study introduces a novel concept for concrete structures using piezoelectric nanoparticles, specifically zinc oxide nanoparticles (ZnO), offering three key benefits: (a) enhanced strength, (b) energy harvesting and storage, and (c) smart control. The experimental phase involves modifying concrete structures with energy harvesting technologies. Dispersion of nanoparticles in water is a key challenge, addressed through magnetic stirring, ultrasonic homogenization, and mechanical stirring. Multiple concrete specimens with nanoparticles were produced, followed by tests including compressive strength assessments, energy harvesting under mechanical loads, and intelligent control of concrete deflection through voltage application. On the theoretical front, modeling and numerical methods predict the behavior of energy harvesting concrete structures. The precise five-parameter theory, accounting for Poisson's effect, is employed for modeling. After deriving governing equations, differential quadrature numerical technique computes deflection and output voltage. Comparisons and validations are made between experimental and simulation results. The experiments reveal that the optimal ZnO nanoparticle content is 0.9%, leading to significant compressive strength improvements of 22.14%, 27.31%, and 34.28% for 7, 14, and 28-day samples, respectively, compared to controls. Beyond this content, compressive strength diminishes. Moreover, 0.9% ZnO-concrete produces an output voltage of 32 volts, well-justified technically and economically. Additionally, +50V voltage induces 9.2mm deformation, while -50V voltage yields 5.8mm, showcasing a substantial 63% deformation alteration potenti

关键词： Energy harvesting

来源：评论

学校读者我要写书评

暂无评论

Damage evaluation method for high-speed railway girder based on ultra-weak fiber Bragg grating sensing technology 8

Damage evaluation method for high-speed railway girder based...

引用

8th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Liu, Weikang Zhang, Xiulin Zhou, Wensong Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Ultra-weak fiber Bragg grating (UWFBG) sensing technology has considerable multiplexing capacity on one fiber. Therefore, UWFBG have the potential of distributed monitoring, and its monitoring accuracy is higher than that of distributed optical fiber sensing technology. In this work, a novel deformation monitoring method based on UWFBG for high-speed railway girders was proposed, and the deformation of a real high-speed railway girder was monitored by UWFBG. In the test, an UWFBG array was pasted on the bottom of a real high-speed railway beam by epoxy resin, and a vibrating wire strain gauge was pasted in the middle of the span for comparison. The beam was loaded step by step through a reaction frame. During the loading process, the deformation of the beam at different positions was recorded by the UWFBG array. The results show that this method can effectively monitor the deformation of high-speed railway girder, and provide safety guarantee for the normal operation of high-speed railway. © 2022 SPIE

关键词： Deformation

来源：评论

学校读者我要写书评

暂无评论

Pipeline Leakage Localization Using Internally Installed Distributed Fiber Optic Sensors 8

Pipeline Leakage Localization Using Internally Installed Dis...

引用

8th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Liu, Weikang Zhou, Wensong Li, Hui Wang, Shuo Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Distributed fiber optic sensing techniques are suitable for pipeline leakage monitoring owing to their long-distance sensing abilities. In this work, a novel pipeline leakage detection and localization method using a distributed fiber optic sensor is proposed. In contrast to conventional methods, the optical fiber is placed in the fluid inside the pipeline without any constraints. When leakage occurs, the local flow field close to the leakage position is disturbed and the fluid pressure caused by the fluid disturbance leads to optical fiber deformation or vibration. With the help of the phase-sensitive optical time domain reflection technique, the fluid disturbance can be detected over a long distance. This work first analyzed the fluid action on the optical fiber. Then, the effects on the fluid field of the local leakage are obtained through finite element simulations. Finally, the proposed method is demonstrated via a series of lab.ratory experiments. © 2022 SPIE

关键词： Optical fibers

来源：评论

学校读者我要写书评

暂无评论

Real-time monitoring of soil moisture field using ultra-weak fiber Bragg gratings 8

Real-time monitoring of soil moisture field using ultra-weak...

引用

8th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Liu, Weikang Zhou, Wensong Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Soil moisture field has an obvious influence on the stability of reservoir bank slope. Thus, effective, real-time, reliable, and high precision monitoring methods are imperative. However, the existing soil moisture monitoring methods have more or less deficiencies. In this paper, a novel soil moisture monitoring and estimation method based on an ultra-weak fiber Bragg grating (UWFBG) array is proposed which is suitable for large-scale in-situ monitoring. A soil moisture monitoring device is designed and fabricated. This monitoring device consists of several monitoring units, and each monitoring unit consists of a soil container, protector and two UWFBG. lab.ratory calibration tests were conducted to establish a relationship between wavelength change and soil moisture content. The test results show that the monitoring accuracy of the device is related to the quality of the loaded dry soil. When the mass of dry soil is 100 g, the monitoring accuracy of soil moisture content is 1.68 % (mass ratio). © 2022 SPIE

关键词： Soil moisture

来源：评论

学校读者我要写书评

暂无评论

The Definition of BIM Engineering Competencies Based on Literature Analysis

The Definition of BIM Engineering Competencies Based on Lite...

引用

2023 International Conference on Construction and Real Estate Management: The Human-Centered Construction Transformation, ICCREM 2023

作者： Man, Qingpeng Liu, Yusi Xu, Ruichen Feng, Kailun Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prev. and Mitigation of Civ. Eng. Disasters of the Min. of Indust. and Info. Technol. Harbin Institute of Technology Harbin China Dept. of Construction Management Harbin Institute of Technology Harbin China Aecom Technical Services Inc. DenverCO United States School of Civil Engineering Harbin Institute of Technology Harbin China

ISBN: (数字)9780784485217

ISBN: (纸本)9780784485217

As the application of BIM technology in projects becomes widespread, the required BIM engineering capability of related technical engineers is also increasing gradually;therefore, establishing a BIM engineering competency enhancement system becomes necessary to provide an industry standard for talent cultivation in associated fields. Based on the literature analysis, this paper determines the connotation of engineering capability, identifies the critical elements of BIM engineering capability enhancement, and establishes the element system of BIM engineering capability enhancement. © ASCE.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Optimal placement of multiple types of sensors based on Bayesian system identification using heuristic-enhanced deep reinforcement learning

引用

Engineering structures 2025年 338卷

作者： Zhong, Qunhong Wei, Shiyin Huang, Yong Jia, Kailiang Li, Hui Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

The advanced structural health monitoring system, integrating multiple types of sensors, provides a comprehensive method for monitoring structural information, effectively identifying abnormal changes, and ensuring the safety of structures in service. However, determining the optimal placement of multiple types of sensors is a challenging combinatorial optimization problem due to its discrete and non-convex nature. The algorithm for optimizing multi-type sensor layouts must be able to handle these complexities effectively. In this paper, a novel multi-type sensor optimal placement algorithm based on heuristic-enhanced deep reinforcement learning (DRL) is proposed. This approach improves algorithm efficiency by initializing with high-quality configurations generated during agent's exploration process. Based on the information entropy and Bayesian theory, we establish a reward function to evaluate the effectiveness of multi-type sensor placement schemes. Three case studies are presented to verify the performance of the proposed algorithm in optimizing sensor placement. Our experiments indicate that adding excessive sensors does not significantly improve monitoring effectiveness, which highlights the necessity of strategically positioning sensors at the most critical data points by optimizing sensor placement to achieve efficient and effective monitoring. We find that incorporating heuristic-based exploration experience significantly boosts the optimization performance of deep reinforcement learning (DRL) algorithm, yielding superior results. The comparison study with other optimization methods also highlights the higher efficiency of our proposed method. © 2025

关键词： Convex optimization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：