检索结果-内蒙古大学图书馆

第三届中国国际复合材料科技大会

作者： Jianghong Xue Fusong Jin Ying Xiong Fei Xia School of Mechanics and Construction Engineering Jinan University/Key Lab of Disaster Forecast and Control in Engineering Ministry of Education

This paper presents a perturbation approach to study the multi scale deflections in T300/QY8911 carbon fiber reinforced, delaminated laminates subjected to a transverse load. In previous works, the contact effects at the interfaces of the delaminated laminates were investigated. A contact factor was introduced to characterize the contact performances and was determined using the micro-mechanics of composite material. In this paper, asymptotic approaches are applied to analyze the large deflection of the delaminated laminates with nonlinear anti-penetrating constrains at the interfaces. Governing equations are solved using separation of variable and the asymptotic solutions are obtained from the Galerkin approach. Perturbation analysis is performed to demonstrate that(1) sublaminates above and below the delamination undergo a consistent global deflection;(2) local buckles occur on the interfaces of the delamination;and(3) the anti-penetrating contact performances are characterized by the local buckles. Furthermore, the asymptotic solutions reveal that the contact performances, i.e., the local buckling, are intrinsic properties of the laminates, relying only on the geometries of the delamination and the material properties. Numerical calculations are performed to demonstrate the application of the analytical solutions. The analytical solutions are in effect by comparing with the classic solutions and the well-established experimental results.

关键词： Perturbation analysis for multiscale deformations of delaminated laminates

来源：评论

学校读者我要写书评

暂无评论

Mechanism and control of spalling for friable sandstone pillars in a room and pillar mine

引用

Journal of engineering Science and Technology Review 2018年第6期11卷 197-205页

作者： Ziwei, Ding Jindui, Jia Amirhossein, Bagherieh Ji, Li Yue, Song School of Energy Xi'an University of Science and Technology Xi'an710054 China Anhui Province Key Lab. of Mining Response and Disaster Prevention Control in Deep Coal Mine Anhui University of Science and Technology Huainan232001 China Department of Mineral engineering New Mexico Institute of Mining and Technology SocorroNM87801 United States

The ability to efficiently control sandstone pillar spalling is extremely important in ensuring the safety and highefficiency production of sandstone mines. The increase in size is usually suggested as a remedy for pillar spalling, but none of the suggested remedies reflect the influences of geotechnical properties of rock mass on stability control. Some sandstone mining practices have proven that increasing the size of pillars cannot effectively control pillar spalling. The relationship between the strength of St. Peter sandstone pillar and pillar loads was theoretically analyzed in the current study, in order to examine the influences of geotechnical parameters of sandstone on the stability of pillars and control pillar spalling. The key geotechnical parameters that influence the stability of sandstone pillars were also examined. Subsequently, the pillar instability mechanism and influences of geotechnical parameters on pillar stability were investigated by Finite Difference Method. Finally, a ground control method using shotcrete on pillar was proposed for increasing the stability of pillars. Results demonstrate that compressive stress on the St. Peter sandstone pillar is considerably larger than the compressive strength after mining, resulting in the evident deformation of most regions. The relation curves of displacement at the pillar top with internal friction angle and cohesion are in the power functional distributions, but the change of cohesion is more significant in the pillar strength. The displacement at the pillar top gradually decreases with the increase in internal friction angle, whereas the plastic failure regions of pillars gradually decrease from the bottom to the upper parts with the increase in cohesion. A field industrial test proves that shotcrete on pillars can increase pillar strength, which effectively controls the pillar spalling. Research results provide theoretical and practical guidelines to enhance the stability of pillars under the sa

关键词： Rock mechanics

来源：评论

学校读者我要写书评

暂无评论

Thermal-Structural Coupling Analysis of PCBA System

引用

IOP Conference Series: Materials Science and engineering 2018年第2期452卷

作者： Wei Su Junhua Zhu Renhuai Liu Zhiyuan He Scienceand Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China

In this paper, the thermal and structural analysis of the PCBA system is provided by using the 3-D ANSYS package. The results of thermal and structural analysis for complex and simple model are compared. The paper also describes the deformation analysis of the PCBA system components, and the weak components sensitive to thermal stress are determined though thermal-structual analysis. The results of thermal analysis are helpful to the optimizing overall arrangement design of PCBA system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research on the performance-based parameter of horizontal visor of certain wall relative to the sun zenith angle

International Journal of Multimedia and Ubiquitous Engineeri...

引用

International Journal of Multimedia and Ubiquitous engineering 2016年第4期11卷 267-276页

作者： Gao, Jian Tang, Jian Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People’s Republic of China Jinan University China

The horizontal shading is one part of the buildings, outside shading systems. Relative sun elevation angle to the wall, and relative sun azimuthal angle to the wall γ are introduced. The optimum width for the southern shading of local buildings can be calculated according to the law of solar altitude change over time. In this research, relative sun elevation angle to the wallis key for design parameters determination of horizontal shading component. The present study optimized the design of the horizontal shading on the basis of the traditional design. The new design of the visor could still shade the exceeding sunlight in summer, but at the same time allow enough sunshine in winter. This design is environmental-friendly, energy and material-saving. © 2016 SERSC.

关键词： Walls (structural partitions)

来源：评论

学校读者我要写书评

暂无评论

Analysis of the key points for increasing passenger traffic efficiencies based on measurements of traffic through ticket gates in 3 cities

引用

International Journal of Simulation: Systems, Science and Technology 2016年第24期17卷

作者： Tang, Jian Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People’s Republic of China Jinan University GuangzhouGuangdong China

By 2012, the passenger traffic capacity for rail transport in Guangzhou reached the highest level of all the cities in China. A questionnaire survey of commuters revealed that 42% of those interviewed in Guangzhou thought the ticket Automatic Gate Machine (AGM) was the most time-consuming aspect of the rail transport system, and its capacity could not meet commuter demand. Therefore, this research focused on the ticket gate machine and its effect on passenger traffic. In addition, concentrating on the sensor area of the ticket gate machine and investigating the machines in Guangzhou, Shenzhen and Hong Kong regions, the optimized key points for increasing passenger traffic efficiencies were found. These were whether the sensor areas lay flat or oblique and whether raised or not, and the color design of the sensor area. © 2016, UK Simulation Society. All rights reserved.

关键词： Efficiency

来源：评论

学校读者我要写书评

暂无评论

New damage-sensitive feature for structures with bolted joints

引用

Journal of Physics: Conference Series 2017年第1期842卷

作者： W F Luo L Yu School of Mechanics and Construction Engineering Jinan University Guangzhou 510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

Compared with riveted and welded joints, bolted joints have advantages of easily dismantled, high load carrying and load-transferring capacity. However, bolted joints are also weaker components of assembled structures. Structural damage detection (SDD) on bolted joints is much required in the field of structural health monitoring (SHM). A new SDD method is proposed for damage identification of structures with bolted joints based on residual error of AR model in time series analysis. Firstly, a new data standardization process is defined to maintain the information of damage location. Then, a new structural damage feature sensitive to structural damage is developed based on the standard deviation of AR model residual errors. To verify the proposed method, a bolted joint structure is designed and fabricated in lab.ratory, connection damages of structures are simulated by loosening the bolted joints. The acceleration responses of structures with bolted joints under healthy and damage cases are acquired. Finally, the SDD is performed by traditional DSF and the new DSF. The illustrated results show that the proposed method is a hybrid tool for the bolted joint damage detection with the new damage-sensitive feature. In addition, some related issues will be discussed as well.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Elastic-plastic analysis of surrounding rock in deep roadway considering shear dilatancy property under non-uniform stress field

引用

Journal of engineering Science and Technology Review 2017年第4期10卷 16-24页

作者： Chuan-Ming, Li Wen-Bao, Shi Wan-Rong, Liu Rui-Min, Feng School of Resource and safety Engineering Anhui University of Science and Technology Huainan Anhui232001 China Anhui Province Key Lab. of Mining Response and Disaster Prevention and Control in Deep Coal Mine Anhui University of Science and Technology Huainan Anhui232001 China School of Physics Science and Information Engineering Liaocheng University Liaocheng Shandong252059 China Department of Mining and Mineral Resources Engineering Southern Illinois University CarbondaleIL62901 United States

The surrounding rock of deep engineering roadway is under the complicated mechanical environment of non-uniform stress distribution, and the stress mechanical model of uniform distribution is obviously different from the surrounding rock of roadway in real stress state. Thus, accurately evaluating the stress and deformation state of surrounding rock is infeasible in non-uniform stress field when employing the mechanical model developed for uniform stress conditions. To reflect the real mechanical state of the roadway surrounding rock accurately and calculate the radius of the plastic zone in roadway surrounding rock precisely, a mechanical model of roadway surrounding rock under non-uniform stress conditions was established in this study based on unified strength theory. One floor roadway of 1231 (1) working face in Panyi coal mine of Huainan coal field was considered as an example. The influences of side pressure coefficient and intermediate principal stress on the scope of the plastic zone in surrounding rock were analyzed. The effect of shear dilatancy property on the deformation and failure process of surrounding rock was discussed, and the field monitoring and verification of the scope of the plastic zone in surrounding rock were conducted on the floor roadways of 1231 (1) and 1252 (1) working face in this mine. Research results indicate that the displacement of the plastic zone enlarges by nearly thrice while the side pressure coefficient increases, and the radius of the plastic zone in roadway surrounding rock in the vertical direction is obviously larger than that in the horizontal direction, which reflects an anisotropic characteristic of the surrounding rock of deep roadway. The displacement of the plastic zone in the surrounding rock enlarges by at least 60% while the shear dilatancy parameter increases, but the morphological change of the plastic zone is minor. Furthermore, the displacement of the plastic zone in the surrounding rock reduces by nearly 35

关键词： Floors

来源：评论

学校读者我要写书评

暂无评论

Identification of joint equivalent parameters via combining PSO with FE model updating

Identification of joint equivalent parameters via combining ...

引用

International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Wenfeng Luo Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9781509040940

In this study, the finite element (FE) model updating method and particle swarm optimization (PSO) algorithm are combined to identify joint equivalent parameters by converting the inverse problem into an optimization problem. First, the natural frequency and frequency response function (FRF) of assembled structures are regarded as an index of the dynamic characteristics. The objective function is defined by minimizing index relative errors between FE model and assembled structures. And then the PSO algorithm is used to solve the optimization problem. The noise effect on the method is also considered. The illustrated numerical simulation results show that the proposed method can identify the equivalent parameters with a good robustness to noises as well as with a high efficiency.

关键词： Fasteners Linear programming Mathematical model Heuristic algorithms Computational modeling Algorithm design and analysis Damping

来源：评论

学校读者我要写书评

暂无评论

Moving force identification based on particle swarm optimization

Moving force identification based on particle swarm optimiza...

引用

International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Huanlin Liu Ling Yu Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9781509040940

Moving force is very important for bridge design, structural analysis and structural health monitoring. Some studies on moving force identification (MFI) attract extensive attentions in the past decades. A novel two-step MFI method is proposed based on particle swarm optimization (PSO) and time domain method (TDM) in this study. The new proposed MFI method includes two steps. In the first step, the PSO is used to identify the constant loads without matrix inversion. In the second step, the conventional TDM is employed to estimate the rest time-varying loads where the Tikhonov regularization and general cross validation (GCV) are introduced to improve the MFI accuracy and to select optimal regularization parameters, respectively. A simply supported beam bridge subjected to moving forces is taken as a numerical simulation example to assess the performance of the proposed method. The illustrated results show that the new two-step MFI method can more effectively identify the moving forces compared to the conventional TDM and the improved Tikhonov regularization method, the proposed new method can provide more accurate MFI results on two moving forces under eight combinations of bridge responses.

关键词： Bridges Force Time division multiplexing Acceleration Particle swarm optimization Time-domain analysis Numerical simulation

来源：评论

学校读者我要写书评

暂无评论

Mechanical Deformation Mechanism of Fiber Reinforced Composites T-joints

引用

IOP Conference Series: Materials Science and engineering 2017年第1期207卷

作者： Wei Su Ke-qiang Cheng Ren-huai Liu Shi-qing Huang Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China

In this paper, we focus on the need for ideal theory analytical solution of mechanical deformation mechanism for T-joints. Through removing unnecessary constraints, stress equivalence system of T-joints can be established by force method. Solution equations of unknown nodal forces and the total vertical displacement can also be obtained, and this result can be used to evaluate strength of FRC T-joints.

关键词：

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：