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斗轮机静动态应力分析 被引量:2
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作者 马春雨 郝岩 尹现吉 《试验技术与试验机》 2006年第4期15-17,共3页
通过在工作环境下的几种实测方法测得大型斗轮堆取料机的各项力学性能,即:对拉杆施以侧向扰动推算得拉杆初始应力;利用应变与应力的线性关系和钢结构载荷与应力的线性关系,通过监测动态应变推算设备的动态力学性能;通过对拉杆的动态应... 通过在工作环境下的几种实测方法测得大型斗轮堆取料机的各项力学性能,即:对拉杆施以侧向扰动推算得拉杆初始应力;利用应变与应力的线性关系和钢结构载荷与应力的线性关系,通过监测动态应变推算设备的动态力学性能;通过对拉杆的动态应变进行监测推算拉杆动态应力和斗轮挖掘力识别等。将各项测试结果与设计要比较,表明其与有限元分析结果接近,从而可知测试结果可靠。 展开更多
关键词 斗轮机 挖掘力识别 初始应力分析
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Fluid-structure coupled analysis of underwater cylindrical shells 被引量:1
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作者 艾尚茂 孙丽萍 《Journal of Marine Science and Application》 2008年第2期77-81,共5页
Underwater cylindrical shell structures have been found a wide of application in many engineering fields, such as the element of marine, oil platforms, etc. The coupled vibration analysis is a hot issue for these unde... Underwater cylindrical shell structures have been found a wide of application in many engineering fields, such as the element of marine, oil platforms, etc. The coupled vibration analysis is a hot issue for these underwater structures. The vibration characteristics of underwater structures are influenced not only by hydrodynamic pressure but also by hydrostatic pressure corresponding to different water depths. In this study, an acoustic finite element method was used to evaluate the underwater structures. Taken the hydrostatic pressure into account in terms of initial stress stiffness, an acoustical fluid-structure coupled analysis of underwater cylindrical shells has been made to study the effect of hydrodynamic pressures on natural frequency and sound radiation. By comparing with the frequencies obtained by the acoustic finite element method and by the added mass method based on the Bessel function, the validity of present analysis was checked. Finally, test samples of the sound radiation of stiffened cylindrical shells were acquired by a harmonic acoustic analysis. The results showed that hydrostatic pressure plays an important role in determining a large submerged body motion, and the characteristics of sound radiation change with water depth. Furthermore, the analysis methods and the results are of significant reference value for studies of other complicated submarine structures. 展开更多
关键词 underwater structure fluid-structure coupled analysis initial stress natural frequency sound radiation
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Combined back-analysis method of ground stress based on refined geological modeling
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作者 Liu Donghai Zheng Jiang Wang Qian 《Engineering Sciences》 EI 2012年第4期43-50,共8页
A new back-analysis method of ground stress is proposed with comprehensive consideration of influence of topography, geology and nonlinear physical mechanical properties of rock on ground stress. This method based on ... A new back-analysis method of ground stress is proposed with comprehensive consideration of influence of topography, geology and nonlinear physical mechanical properties of rock on ground stress. This method based on non-uniform rational B-spline (NURBS) technology provides the means to build a refined three-dimensional finite element model with more accurate meshing under complex terrain and geological conditions. Meanwhile, this method is a back-analysis of ground stress with combination of multivariable linear regression model and neural network (ANN) model. Firstly, the regression model is used to fit approximately boundary loads. Regarding the regressed loads as mean value, some sets of boundary loads with the same interval are constructed according to the principle of orthogonal design, to calculate the corresponding ground stress at the observation positions using finite element method. The results (boundary loads and the corresponding ground stress) are added to the samples for ANN training. And on this basis, an ANN model is established to implement higher precise back-analysis of initial ground stress. A practical application case shows that the relative error between the inversed ground stress and observed value is mostly less than 10 %, which can meet the need of engineering design and construction requirements. 展开更多
关键词 ground stress BACK-ANALYSIS combined method refined geological modeling artificial neural network(ANN) NURBS
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泉州体育馆张弦桁架支撑壳体结构设计的关键问题 被引量:5
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作者 张峥 丁洁民 《建筑结构》 CSCD 北大核心 2008年第2期23-28,共6页
泉州市体育馆的椭球型屋盖采用张弦桁架支撑壳体。重点介绍了该结构在分析和设计中的关键问题:利用NURBS造型技术生成泉州体育馆非规则屋盖曲面、结构体系布置;结合工程实例提出了张弦桁架结构拉索初始预应力取值的若干原则以及合理处... 泉州市体育馆的椭球型屋盖采用张弦桁架支撑壳体。重点介绍了该结构在分析和设计中的关键问题:利用NURBS造型技术生成泉州体育馆非规则屋盖曲面、结构体系布置;结合工程实例提出了张弦桁架结构拉索初始预应力取值的若干原则以及合理处理支座水平推力的方法;利用弹塑性方法分析其稳定性和极限承载力以说明张弦结构优异的力学性态。 展开更多
关键词 张弦桁架 支撑壳体 形态设计 初始应力分析 极限承载力
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