基于ANSYS的迎流耐压壳体强度与稳定性分析

迎流耐压壳体是水下航行器的重要承压部分,必须对其进行强度和稳定性计算,由于其结构复杂,传统理论计算准确性较低,故应用有限元分析软件ANSYS进行分析。对迎流耐压壳体进行有限元建模、加载、强度分析及稳定性分析,获得迎流耐压壳体的应力情况和失稳临界载荷,为其结构设计提供了重要理论依据。     

水下机器人耐压壳体结构优化

基于响应面法对水下机器人耐压壳体结构优化,以耐压壳体结构5个尺寸为优化变量,借助ANSYS求解结构应力响应数值,利用组合试验缩小优化变量范围后进行响应面试验设计,优化约束条件为耐压壳体强度和稳定性满足要求,目标函数为壳体质量最小,利用Design-Expert试验设计软件进行响应面优化求解,将结果与利用1st Opt数值计算软件得到优化数值对比,最终优化结果为耐压壳体质量降低15.52%,且壳体满足强度和稳定性要求,达到优化目的。     

于ANSYS对混合驱动水下滑翔器耐压壳体设计及分析

对混合驱动水下滑翔器的耐压壳体进行了设计计算与有限元分析。首先对耐压壳体的材料、结构进行了选择设计,然后分别对耐压壳体壁厚、失稳、变形方面进行了设计计算,从而验证了结构、尺寸确定的理论可靠性。最后,通过对混合驱动水下滑翔器的耐压壳体中最危险部分进行强度和屈曲有限元仿真,得到分析结果与设计计算结果基本一致,从而验证了耐压壳体的设计是合理的、可行的,为混合驱动水下滑翔器的实体试验提供了很大的借鉴价值。     

复合材料薄壁圆柱壳热振动特性分析

采用有限元软件ANSYS参数设计语言（APDL）实现复合材料薄壁圆柱壳结构在线性分布温度场作用下的非线性热振动特性分析。计算不同约束条件、不同铺层方式和铺层层数的复合材料薄壁圆柱壳在线性温度场作用下的各阶固有频率，分析边界约束、铺层角度及铺层层数对结构热振动频率的影响。结果表明，温度效应、边界约束、铺层层数显著影响结构的固有频率，适当的铺层角度会改变结构的固有频率，不同的铺层方式对结构固有频率影响程度不同。这些结论将对复合材料结构设计、抗热设计有一定的指导作用。     

基于ANSYS的三闭式SMA混杂复合材料箱型薄壁梁的模态分析

采用有限元分析软件ANSYS对SMA混杂复合材料箱型薄壁梁进行了模态分析。首先建立了SMA混杂复合材料箱型薄壁梁的有限元模型，运用ANSYS软件中的Material Designer模块建立SMA/石墨/环氧树脂复合材料模型并获得其材料参数，通过ANSYS复合材料ACP模块对复合材料箱型薄壁梁进行铺层，然后对SMA混杂复合材料箱型薄壁梁进行模态计算，讨论了配置方式、铺层角度、宽高比、单层SMA体积含量、SMA安装位置对固有频率的影响。     

潜水器耐压壳强度分析方法研究

耐压壳体的强度是大深度潜水器研究的关键,近年来引起了国内外各学者的关注,而在潜水器结构耐压强度分析中,有限元模型的建立和边界条件的处理是分析工作必不可少的环节。通过导入SolidWorks中所建潜水器耐压舱实体模型的外表面,再利用ANSYS软件中工作平面(WP)的强大功能,提出了一种方便、快捷的潜水器耐压舱有限元建模方法;在对耐压舱进行边界条件处理时,考虑到实际受力情况,提出了一种新的边界条件的处理方式。理论分析计算证明这种对潜水器耐压壳体强度分析的有限元处理方法是可行的。     

基于无力矩理论的ITER外真空杜瓦力学特性分析

介绍了外真空杜瓦的结构、作用、材料和力学特性,依据薄壁压力容器的相关理论,对杜瓦筒体和封头的薄膜应力进行了分析说明,利用有限元分析工具ANSYS计算了两种不同工况下的tresca应力,参照ASME对分析结果进行了评定。     

基于ANSYS的深水油气田电气分配模块壳体设计及耐压性能分析

提出了压力平衡结构外壳体与内部耐压壳体相结合的深水油气田电气分配模块壳体结构方案,阐述了压力平衡外壳的组成,并采用图算法对耐压壳体的腔体和封头壁厚进行设计。使用ANSYS Workbench软件对内部耐压壳体进行耐压性分析,结果表明,腔体拥有较好的耐压性,能满足功能要求。     

复合材料结构材料参数转换及在有限元分析中的应用

多层的纤维缠绕复合材料结构中,各个单层间具有不同的纤维铺设角,呈现各向异性的材料特性,在进行有限元分析时,必须对材料的材料特性进行处理变换。根据基本力学方程,对不同缠绕方向的纤维层材料,把不同材料坐标系下的特性参数等效变换到统一坐标系。并利用ANSYS软件对层合结构进行有限元分析,结果表明此转换是可行的。     

基于结构复合材料的水下耐压壳体应用

简要说明了水下耐压壳体的使用环境和主要功能,重点介绍了工程实际中通常采用的结构复合材料的组成形式,并对复合材料弹性性能的并联和串联受力模型进行了初步分析和描述.用实例说明了水下探测设备耐压壳体的制造工艺,建立了壳体有限元模型,同时对其强度进行了分析与讨论.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.