基于ANSYS的矩形常压容器优化设计

利用有限元分析软件ANSYS对中间加隔板的矩形常压容器进行分析,充分考虑隔板和加强筋对设备本身强度的加强作用。以实际项目为例,对大型矩形常压容器的结构进行优化。将优化结果与常规设计相比较,表明新的设计方案较一般的设计准则有较明显的优势。     

带隔板大直径常压容器的结构分析与实验研究

带隔板大直径常压容器通常用于盛装两种物料，当一侧装满物料，另一侧全空情况下，隔板变形比较大，如果筒体壁厚和隔板厚度较薄时，可能影响该类容器的正常工作。本文通过一个典型的实例，用有限元分析与现场实验相结合的方法进行结构分析与实验研究。     

某化工容器槽体的结构设计及试验

主要讨论某常压化工容器槽体结构的设计,运用有限元的方法对初步设计的方案进行筛选。用三维建模软件Solid Works对常压容器进行实体建模,再运用有限元模块Solid Works simulation对不同壁厚的槽体进行有限元分析,根据分析结果采用角钢加强的方式对槽体的薄弱部位进行加固,最后再对其进行强度和刚度的校核。分析结果表明:角钢加固方法可行,保证了设备的安全可靠性,满足设计要求,此方法为其他常压容器的设计提供一定的参考。     

隔板燕尾型榫槽工艺方案分析

线切割的主要特点是精度高、工序少、变形小、加工中产生的应力较小,因此对薄壁件的加工有明显的加工优势,燃机隔板的结构正好在此适用范围,文中论述了燃机隔板外环燕尾形榫槽采用线切割加工的工艺适用性。     

专用校车隔板及座椅在动态试验中对后排成员保护的对比研究

为研究专用校车座椅动态试验中隔板和座椅对后排成员保护效果的差异,在按照GB 24406-2012《专用校车学生座椅系统及其车辆固定件的强度》法规进行座椅及隔板的抗前倾性能试验的基础上,通过对比隔板和座椅对后排假人的头部、胸部及腿部所产生的伤害值得出结论:在抗前倾性能动态试验过程中,当座椅前排由座椅更换为隔板时,对后排成员的头部保护作用变差,对胸部的保护作用影响不大,对于腿部保护作用加强。此研究为校车座椅用户提供了参考,也为座椅及隔板生产厂提供了隔板结构改进的依据。     

抽汽调节式转动隔板结构设计改进

通过改进后的抽汽调节式转动隔板与原设计结构对比研究分析,验证了改进型的转动隔板在设计和生产上具有可行性,转动隔板工作顺畅,提高了机组安全性.     

探讨卧式容器鞍座位置对筒体受力分析的影响

卧式容器在工业生产领域广泛应用，保证卧式容器结构的安稳性，才能正常发挥出功能作用。本文针对卧式容器鞍座位置的设计进行探究，从鞍座结构要求和筒体受力计算入手，分析了鞍座位置对筒体受力的影响，并结合计算实例进行阐述。结果表明，卧式容器鞍座位置对筒体受力具有明显影响，提示设计人员根据容器的受力特点，对鞍座位置进行合理设计，必要时采用加强设计方案，以保证卧式容器的使用安全性。     

针对某型客车约束隔板乘员损伤的仿真与改进

使用LS-DYNA针对某型客车约束隔板进行了仿真和改进,改进后的隔板满足了GB13057标准要求。基于该仿真和改进工作,总结了客车约束隔板在做损伤试验时假人头部伤害普遍偏高的原因,发现对于客车约束隔板标准GB11550的试验方法和要求不能与标准GB13057中的动态损伤试验等效,并且探讨了如何降低客车约束隔板后方乘员的伤害,提出了设计改进思路以供设计人员参考。     

汽轮机抽汽机组旋转隔板的改进

汽轮机抽汽机组带旋转隔板结构形式比较普遍,而这种旋转隔板结构在电厂运行中总会出现开启和关闭时卡涩和易损等现象,影响调整抽汽,进而影响电厂的热稳定性和经济性。文中对旋转隔板进行了改进设计。     

基于EN 13445直接法的深海外压容器稳定性研究和影响因素分析

深入分析欧盟EN 13445标准直接法稳定性校核原理及应用准则,充分考虑实际工程中的材料非线性和几何非线性因素,建立基于EN 13445压力容器分析设计直接法的深海外压容器稳定性分析模型。根据深海外压容器稳定性校核危险工况,提出结构屈曲分析和稳定性校核方法,并在此基础上深入分析结构参数对深海外压容器稳定性的影响,构建深海外压容器分析设计的稳定分析和校核技术体系。最终开展2000 m深海外压容器高压舱外压试验,试验表明所述深海外压容器稳定性分析校核体系能够准确可靠地分析校核深海外压容器。为深海外压容器的稳定性校核和结构优化提供一种行之有效的方法,填补了深海外压容器稳定性研究方面的空白。     

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...     

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.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.