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第八届国际振动工程会议

作者： Guanbin Chen Wenli Chen Donglai Gao Xiangwei Min Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology

A coupled dynamic equation model, consisted by two parts: structural dynamic equation and the improved van der Pol equation(IVDPE), is established to predict the vortex induced vibration(VIV) response of circular cylinder dipped in the fluid environment. A classical structural dynamic equation is applied to describe the one degree-of-freedom vibration of a circular cylinder. The improved van der Pol equation is used to model the wake flow dynamics and the fluctuating aerodynamic force derived from the periodic alternating vortex shedding. The complete frequency component of aerodynamic forces, vibration amplitude and lock-in domains can be successfully predicted by the present coupled dynamic equation model. In addition, the passive jet pipes equipped on the circular cylinder to form the jet flow to suppress the VIV through the experimental method. The aerodynamic forces acting on the different sections far away from the passive jet pipes was obtained by the digital pressure measurement system. The aerodynamic force changed by the passive jet flow is consider into the coupled dynamic equation, and then the update coupled model is constructed and can predict the VIV of the circular cylinder with different spacing of adjacent passive jet pipes.

关键词： vortex-induced vibration alternating vortex shedding coupled model passive jet flow

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Physical Review Fluids 2024年第5期9卷 054608-054608页

作者： Xue-Lu Xiong (熊雪露) Shujin Laima (赖马树金) Hui Li (李惠) Yi Zhou (周毅) School of Energy and Power Engineering Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications

This paper presents a quadrant analysis of turbulent rotor wakes, placing a particular emphasis on the self-similarity in single-point turbulent statistics. The self-similarity analysis reveals that within the wake self-similar region, the distribution of the Reynolds shear stress −u′v′¯ and the turbulent kinetic energy k in different quadrants can also attain a state of self-similarity. The length scaling is the same for −u′v′¯, k, and their different quadrant contributions. However, the velocity scaling of the ejection contribution differs from that of −u′v′¯ and k. Additionally, the analysis of hole filtering and spectrum filtering effects on the self-similarity and scaling of the ejection contribution to −u′v′¯ reveals a strong connection between ejection events and large-scale coherent structures, as well as deceleration extreme events. This finding is further confirmed through quadrant analysis of the time evolution of velocity fluctuations. The present study can be helpful in improving our understanding of the turbulent wake self-similarity.

关键词： Shear flows Wakes & jets

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Policy Trends and Policy Analysis for the Industrialization of the Construction Industry: A Review

Policy Trends and Policy Analysis for the Industrialization ...

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2018 International Conference on Construction and Real Estate Management: Innovative Technology and Intelligent Construction, ICCREM 2018

作者： Li, Xiaoting Wang, Yuna Geng, Yunpeng Wang, Qian Dept. of Construction Management Harbin Institute of Technology Harbin150001 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150000 China Dept. of Architecture and Civil Engineering Harbin Institute of Technology Harbin150001 China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

Industrialization of the construction industry is the direction of change in the mode of building production, so it is imminent to promote the development of industrialization of the construction industry in China. The Chinese government put forward different policies for the development of industrialization of the construction industry in different stages of industrialization of the construction industry. In this review, we describe current researches on the policy of promoting the industrialization of the construction industry in China, discuss the advantages and disadvantages of nine kinds of research methods, and put forward some policy recommendations to promote the industrialization of buildings. In addition, we provide a framework for policy study on industrialization of the construction industry using policy bibliography. © 2018 American Society of Civil Engineers.

关键词： Construction industry

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Big-data driven building retrofitting: An integrated support vector machines and fuzzy c-means clustering method

Big-data driven building retrofitting: An integrated support...

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World Sustainable Built Environment - Beyond 2020, WSBE 2020

作者： Lu, Weizhuo Feng, Kailun Department of Civil Environmental and Natural Resources Engineering Luleå University of Technology Sweden Department of Construction Management Harbin Institute of Technology Harbin150009 China 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 Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

It has become a mainstream to use physical models to quantify expected energy savings from alternative retrofit methods and technologies. However, they are not suitable for predicting energy use of buildings when detailed and specified input parameters are unavailab.e. The overall purpose of the research is to support the stakeholders in taking decisions on refurbishments options when not all of physical information is availab.e, in order to achieve the Swedish Energy Agency's measurements of near-zero energy buildings. The research will transfer big data from Swedish Energy Performance Certificates for building retrofitting. A Support Vector Machines and Fuzzy C-means clustering (SVM-FCM) integrated machine learning algorithm is used directly to extract the case-specific knowledge from EPC big data regarding building characteristics and energy saving of retrofit measures. It enables to prioritize retrofit measures and compute their expected energy savings for buildings. This proposed data driven method is an attempt of taking advantage of big data for practical building retrofit selection. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Support vector machines

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Experimental study on pore structure and chloride ion diffusion of negative temperature cement-based materials

Experimental study on pore structure and chloride ion diffus...

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第三届中国国际复合材料科技大会

作者： Guan Xinchun Bai Shuai Li Hui Ou Jinping Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology

The early frost may cause serious injury to the internal pore structure of concrete, and hence has a strong influence on the impermeability and mechanical properties of concrete. In this paper, the chloride ion diffusion coefficient of different frozen level and different kind negative temperature cement-based materials was studied. The pore structures of those negative temperature cement-based materials was studied by fractal theory. The correlation between chloride ion diffusion coefficient and fractal dimension was discussed. Experimental results show that the pore structure of negative temperature cement-based materials possesses fractal characteristics and fractal dimension has good correlation with chloride ion diffusion coefficient. The results can provide a reference to application of negative temperature concrete.

关键词： Cement-based materials Negative temperature concrete Pore structure Fractal Chloride diffusion

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An on-site evaluation method for corrosion degradation of in-service cable wires by image histogram matching 11

An on-site evaluation method for corrosion degradation of in...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Xu, Yang Li, Shunlong Li, Hui Gu, Chenyu Li, Xinbin Chen, Xiaowei Qiao, Weidong Key Lab of Intelligent Disaster Mitigation Ministry of Industrial and Information Technology Harbin150090 China 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 Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781605953304

This paper proposes a novel non-destructive method by image histogram matching to evaluate the corrosion degradation of cable wires in service quantitatively. Artificial accelerated salt spray test is adopted to simulate the corrosion environment, and adequate RGB images are taken by a consumer-grade camera to cover the whole information of corroded surface for each specimen under different corrosion periods. Histogram distribution analysis is applied to study the concentrated modes of RGB images, and joint Gaussian distribution is fitted to capture location parameters. Timevariant models of the location parameters are regressed and then the mechanical properties are learnt by tensile and fatigue tests. Once the features of RGB corrosion images of steel wires are matched to the proposed time-variant models, the corresponding corrosion degree and mechanical properties can be estimated. The proposed method is meaningful for the on-site evaluation of cable wires in service with no need to carry on corrosion and mechanical degradation tests after replacing cables.

关键词： Graphic methods

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A new numerical scheme for simulating non-gaussian and non-stationary stochastic processes

arXiv

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arXiv 2020年

作者： Zheng, Zhibao Dai, Hongzhe Wang, Yuyin Wang, Wei Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

This paper presents a new numerical scheme for simulating stochastic processes specified by their marginal distribution functions and covariance functions. Stochastic samples are firstly generated to automatically satisfy target marginal distribution functions. An iterative algorithm is proposed to match the simulated covariance function of stochastic samples to the target covariance function, and only a few times iterations can converge to a required accuracy. Several explicit representations, based on Karhunen-Loève expansion and Polynomial Chaos expansion, are further developed to represent the obtained stochastic samples in series forms. Proposed methods can be applied to non-gaussian and non-stationary stochastic processes, and three examples illustrate their accuracies and efficiencies. Copyright © 2020, The Authors. All rights reserved.

关键词： Stochastic systems

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Stereovision measurement of 3D postures of a semi-submersible floating wind turbine model in wave test 9

Stereovision measurement of 3D postures of a semi-submersibl...

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9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019

作者： Shan, Baohua Xiao, Yiqing Li, Chao Liu, Yang Zhou, Shengtao Xue, Zhilin School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Mining of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology Shenzhen Graduate School Harbin Institute of Technology Shenzhen518055 China

To measure 3D postures of a semi-submersible floating wind turbine model in wave test, a stereovision measurement method based on a reference plane established by calibration board is proposed in this paper. The world coordinate system transforms from the left camera system to the surface of the measured structural model through the coordinate transformation. A regular wave test of semi-submersible floating wind turbine model is proceeded with the stereovision measurement system. The displacements and angles of rotation in three direction on the measured model are acquired simultaneously, and the power spectral densities of the model's displacements are calculated. Experimental results indicate that the displacement time-histories measured by the proposed stereovision method agree well with those obtained by the laser displacement meter. This verifies that the proposed stereovision approach is reliable and useful for measuring the 3D postures of multiple points on the model. © 2019 9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019 - Conference Proceedings. All rights reserved.

关键词： Structural health monitoring

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Mechanical and Thermal Properties of Environmentally Friendly Straw Boards

SSRN

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SSRN 2023年

作者： Zheng, Chaorong Sun, Kuo Chen, Yixiao Zhang, Wenyuan Wu, Yue School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

Straw is an environmentally friendly, cost-effective, and abundant raw material for building boards. To assess the feasibility of using straw boards as alternative sheathing panels in light-steel-members such as walls and floors, the mechanical and thermal properties of straw boards with high densities were investigated. The straw boards involved in this study include five wheat straw strand boards (WSSB12, WSSB15, WSSB18, WSSB25, and WSSB30) and a paper straw board (PSB58). Mechanical properties, including compression, tension, and bending properties, were investigated by tests and a proposed prediction method of tensile strength. In the experimental studies of compression properties, the failure modes and characteristics of load-deformation curves of compressive specimens, and the parameters of compression properties, including the strength, elastic modulus, and Poisson ratio, were analyzed and summarized, and the differences in material directivity were discussed as well. The WSSBs were found to be transverse isotropic material with brittle characteristics in the plane, while the PSB showed similar brittle characteristics in the failure stage. Furthermore, the experimental studies of bending properties and similar analyses and summaries for test results were carried out. Results show that the bending strength is less than the compressive strength for WSSBs, while the case is just the opposite for PSB, and the elastic moduli of bending and compression are close for both WSSBs and PSB. Then, finite element models (FEMs) of the bending test specimens using the user material subroutine UMAT were developed to predict the tensile strength ft, and the prediction results were qualitatively assessed based on the correlation between ft and fb, fc. As verified, the prediction results of ft are believable, and the prediction method proposed in this study is feasible. Such a prediction method could efficiently determine the tensile strength of similar brittle materials withou

关键词： Tensile strength

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Axial Compressive behaviors of the Curved Steel-Plate Composite Walls with Small Curvature Radius-to-Section Thickness Ratio

SSRN

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SSRN 2024年

作者： Guo, Lanhui Liu, Cheng Gao, Shan Yu, Yue Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China China National Nuclear Power Co. Ltd Beijing China

Curved steel-plate composite (SC) walls are widely used in nuclear engineering due to their advantages in seismic performance and modular construction. This study tested the axial compression performance of five curved SC wall specimens and three flat SC wall specimens by considering the effects of the curvature radius-to-section thickness ratio (R/T) and connector spacing-to-steel plate thickness ratio (b/t). The tested results show that the steel plates in curved SC walls with small R/T (R/T © 2024, The Authors. All rights reserved.

关键词： Axial compression

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