基于模糊可靠度约束的单级圆柱齿轮减速器的多学科协同优化设计

多学科协同优化设计主要用来解决复杂系统的优化设计问题。近些年来研究者已将多学科协同优化设计方法应用于单级圆柱齿轮减速器的设计中,但与以往的常规优化方法一样,在减速器的多学科协同优化设计中,未考虑设计中一些基本参数的模糊性和离散性,因此,在充分考虑了单级圆柱齿轮减速器各设计参数的模糊性和随机性的基础上,结合新近发展起来的多学科优化设计方法,探讨了基于模糊可靠度约束的单级圆柱齿轮减速器的多学科协同的优化设计方法,给出了实例,并验证得到满意结果。     

基于协同优化矿用自卸车传动系统优化设计

动力传递系统是矿用自卸车最重要组成单元,系统中轮边减速器和主减速器减速比的合力分配是动力性能发挥和整车减速增扭平稳运行的重要保证,采用协同优化对矿用自卸车动力传递系统进行优化设计。根据矿用自卸车传动系统结构特点和性能特征,将传动系统动力匹配作为系统级,而主减速器和轮边减速器作为子系统级。对轮边减速器和主减速器进行数学建模,并对各减速装置单独优化分析。基于i SIGHT实现矿用自卸车轮边减速器和主减速器协同优化的过程集成和优化求解。对比各自单独优化和系统整体协同优化分析结果可知:整体系统的协同优化可以系统地解决矿用汽车减速系统的优化匹配问题,同以往将全局设计变量作为固定参数进行处理的常规优化相比,其优化结果更符合实际工程问题。     

基于网络的协同设计系统开发

分析协同设计系统的发展背景、研究现状和特点,提出基于网络的协同设计系统的体系结构,在此基础上,开发了一个基于J2EE和CORBA技术的协同设计原型系统。论述该原型系统的主要功能、系统框架和网络结构。最后以减速器为例,给出了系统的运行情况。     

基于虚拟仪器的减速器试验台测控系统设计

所述减速器试验台是用来对RV(旋转矢量)减速器与谐波减速器关键性能进行测试的试验装备。基于测控技术、虚拟仪器技术,在采用通用硬件的条件下设计了一套既满足试验要求、集成度高,又具有良好人机交互的减速器试验台测控系统。试验台已交付使用,为用户节省了工作成本、提高了工作效率,证明了该减速器试验台测控系统设计的可行性。     

基于UG的减速器KBE系统的研究与设计

为了提高减速器的设计质量和效率,将知识工程技术应用到其设计过程中,利用UG二次开发工具UG/OPEN API等开发出集成在UG系统中的减速器KBE系统,实现减速器的设计、建模、装配,文章重点阐述了系统的总体设计及其关键技术,并以单级斜齿轮减速器设计为例,说明了系统的开发及应用过程.     

模块化系列化产品(减速器)的计算机辅助管理

本文介绍了模块化系列化产品(减速器)的计算机辅助管理软件的设计方法.包括系统的模块编码方法和管理程序的结构.     

基于TBS模型的减速器设计方法的研究

TBS(顶层基本骨架)模型作为自顶向下的参数化设计的重要工具被应用到减速器产品设计过程中.本文论述、分析了基于TBS原理进行减速器设计的必要性,讨论了构建减速器TBS模型的方法,阐明了基于TBS模型的相关数据进行零部件设计和设计变更的详细步骤,为实现减速器系列化设计提供了理论依据.采用此设计方法,保证了减速器各组件从设计到加工整个过程中设计信息的继承与共享,大大提高了产品的设计质量和效率.     

三环减速器智能CAD系统的研究与开发

三环式齿论减速器是在普通少齿差行星减速器基础上开发的一种新型传动装置,应用前景广泛.但由于三环减速器问世时间短并且结构特殊,对其进行设计和分析比较复杂和困难.该研究建立了一个用于三环减速器设计的智能CAD系统,可以方便、快速、准确地完成三环减速器的三维设计,提高了设计效率和质量.研究同时建立了三环减速器的三维零件库,对产品系列化有着重要意义.     

基于设计空间缩减的多学科协同优化新方法

提出一种多学科协同优化设计新方法—设计空间缩减协同优化(Design space decrease collaborative optimization,DSDCO)。根据子系统级优化结果,确定分解设计空间的平面方程,将设计空间合理分解为多个子空间,去除其中不可行设计子空间,将缩减后的设计空间传递到系统级优化。根据系统级优化在各个子空间的优化信息,择优选取系统级优化结果和下一次优化计算的设计空间,循环进行优化迭代计算,直至系统级优化值符合收敛条件。该方法通过缩减优化求解空间,不断更新系统级优化模型,将传统协同优化(Collaborative optimization,CO)中系统级非线性等式约束变换为只含有变量边界的线性不等式约束,解决了传统CO系统级求解困难的问题。DSDCO在变量有界的多学科设计优化(Multidisciplinary design optimization,MDO)问题中,对原始问题约束函数的凸性无要求,对优化迭代起始点的位置无要求。分别利用数值算例、减速器设计和弹簧设计三个典型算例,验证了DSDCO方法的正确性。     

谐波齿轮减速器虚拟测试系统的研究

在对谐波齿轮减速器的转矩、转速、效率、传动精度等参数的测试方法、测试原理研究的基础上,利用虚拟仪器技术,对谐波齿轮减速器的性能测试系统进行了研究和设计.并运用labview2009软件编程,设计了适用于谐波齿轮减速器的虚拟测试系统.该测试系统充分发挥了计算机的处理能力,降低了硬件成本投入.     

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.     

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....     

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.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.