磁流变减振器磁路结构的参数化优化设计

磁流变减振器是一种新型智能减振装置,而磁流变减振器的磁路结构是磁流变减振器设计的重点,在磁流变减振器磁路结构设计中引入有限元分析的优化设计过程,介绍了ANSYS的参数化编程语言APDL及其在磁路结构优化设计中的应用,并针对某一磁流变减振器的磁路结构运用APDL语言对其进行优化设计。分析结果显示,运用APDL语言对磁流变减振器的磁路结构进行优化设计后,间隙处的磁感应强度明显增加,磁场分布更加合理,是一种有效的磁路优化设计方法。     

基于ANSYS的布袋除尘器花板优化软件的开发

在有限元分析软件ANSYS平台上,利用参数化设计语言APDL和用户界面设计语言UIDL,根据布袋除尘器花板结构的特点,以有限元分析和优化算法相结合的手段,建立了花板的有限元参数化模型和优化数学模型.应用APDL编制花板有限元优化计算程序,应用UIDL编制用户界面.通过软件封装布袋除尘器花板有限元模型、优化数学模型等要素...     

ANSYS二次开发技术在卫星结构优化中的应用

参数化设计语言APDL作为ANSYS软件自带的批处理语言,为ANSYS的高级应用提供了一个有力的工具.探讨利用APDL语言和VC++相结合进行二次开发,实现了卫星结构优化计算的程序化.实例应用表明该方法合理可靠,交互界面简单实用,能有效地提高卫星优化设计的效率,对于类似问题有较强的适用性.     

APDL语言在水下夹桩器结构优化设计中的应用

水下夹桩器是一种广泛应用于海洋石油平台建设的液压夹具。在水下夹桩器设计中引入有限元分析的优化设计过程,介绍了ANSYS优化设计步骤和ANSYS参数化设计语言(APDL),并以水下夹桩器液压缸壁为研究对象,应用参数化设计语言完成了不同系列水下夹桩器液压缸壁的结构优化设计。优化后的结构特性与受力状况得到改善,设计出来的结构满足工程要求。分析结果显示,将APDL语言面向对象软件设计应用于水下夹桩器是一种有效的方法。     

利用ANSYS实现零件的可靠性优化设计

基于ANSYS参数化设计语言(APDL)的数学运算功能,运用可靠性理论的摄动分析法,利用APDL编程实现零件的可靠度计算,避免了有限元建模、分析和结果的参数化提取等步骤.利用ANSYS的设计优化模块,以摄动分析法计算的零件可靠度为约束条件,以零件的最小体积为优化目标寻求设计参数的优化设计.开辟了一个利用ANSYS进行可靠性优化设计的途径,扩展了ANSYS的分析范围.     

大行程直线电机的磁流变阻尼器优化设计

对应用于大行程直线电机的磁流变阻尼器结构进行了探讨,并应用ANSYS电磁场有限元分析和ANSYS优化设计计算和优化了阻尼器磁路和结构.     

ANG汽车储气罐结构优化的研究

以某新型ANG汽车储气罐的结构优化为例,利用APDL语言对ANSYS软件进行了二次开发,创建对应的交互界面。建立了箱体参数化的三维实体有限元模型,并对其进行了有限元分析,然后以储气罐轻量化设计为优化目标,利用ANSYS优化设计的优化设计模块和APDL语言,对储气罐的结构参数进行了优化计算,获得较合理的结构尺寸。结果表明:在保证储气罐各种性能的前提下,储气罐优化后的质量比优化前减少了26.33%,同时表明APDL的使用,对加快分析进度,提高设计效率具有重要的指导意义。     

基于ANSYS的孔式磁流变减震器的磁路设计及优化

设计了一种孔式磁流变减震器的磁路结构,运用ANSYS软件的参数化编程语言APDL建立磁路的有限元模型,对其进行仿真并优化。通过优化分析,得出在某一材料、某一参数结构下,阻尼通道区间的磁感应强度达到最大,比假定参数下的磁感应强度明显增大,提高了39.4%。结构更加合理,达到了优化的目的。     

布袋除尘器壳体有限元优化设计

基于ANSYS有限元分析软件平台,利用其内部开发工具(APDL和UIDL),依据布袋除尘器壳体结构的特点,以有限元分析和优化算法相结合的手段,建立了布袋除尘器壳体的有限元参数化模型和优化数学模型。应用APDL编制壳体有限元优化计算程序,应用UIDL编制用户界面。通过软件封装布袋除尘器壳体有限元模型、优化数学模型等要素,使得对于有限元和优化不熟悉的普通设计人员也能使用。该优化软件可广泛应用于布袋除尘器壳体的实际设计工程中。     

ANSYS参数化编程语言的二次开发及应用

利用ANSYS中的APDL语言进行二次开发,编写专门程序,实现了自动多次改变边界条件,求解并记录指定节点上的应力或变形,解决了柔度矩阵的建立和曲轴动应力计算两个典型问题.计算结果表明,采用APDL语言进行二次开发,扩展了ANSYS软件的功能,可解决机械工程设计中的一些关键技术问题.     

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.