基于改进遗传算法汽车动力传动系统性能仿真软件

探讨了建立发动机燃油经济性和排放性能模型、定义汽车运行循环、预测汽车动力性燃油经济性和排放性能,介绍了自主开发的VDS车辆动力学软件.通过实车道路和底盘测功机的性能试验对VDS软件进行验证.     

基于改进遗传算法汔车动力传动系统性能仿真软件开发

探讨了建立发动机燃油经济性和排放性能模型、定义汽车运行循环、预测汽车动力性燃油经济性和排放性能，介绍了自主开发的VDS车辆动力学软件。通过实车道路和底盘测功机的性能试验对VDS软件进行验证。     

考虑排放约束的汽车动力传动系的优化匹配研究

基于GT-drive软件建立汽车整车仿真模型,并利用多目标优化设计软件mode FRONTIER与GT-drive软件联合构建汽车动力性、燃油经济性的双目标优化模型,在此基础上兼顾排放约束对某中级乘用车的动力传动系进行优化匹配,得到一组关于各挡速比与主减速比的Pareto解集(多目标规则问题的有效解)。根据研究车型的具体设计选取合适的解进行分析,结果表明:优化后的汽车在动力性、经济性和排放性能方面均得到了不同程度的改善。     

基于ADVISOR的汽车燃油经济性对比分析

燃油经济性是电动汽车优于传统汽车的一个重要方面。以混合动力汽车以及传统汽车为例,采用ADVISOR软件在美国UDDS工况下对两种车辆进行燃油经济性分析,得出混合动力汽车和传统汽车的燃油消耗。并对仿真结果进行深层分析,研究两种汽车的经济性能。     

轿车自动无级变速器的试验研究及其试验装置的开发

燃油经济性和较少的有害气体排放和日益增大的舒适性等要求是现代汽车十分重要的研究课题,ＣＶＴ已经从理论上回答现代汽车设计所需迫切解决的很多问题,其主要优点是改善了汽车性能,燃油消耗和排污。     

插电式并联混合动力汽车遗传模糊控制策略优化设计

以提高插电式混合动力汽车燃油经济性和排放性能为目标,设计了能够实现需求转矩在发动机和驱动电机之间合理分配的模糊控制策略,并详细介绍了遗传算法优化模糊控制规则的方法。优化结果表明,优化后的模糊控制策略较优化前提高了燃油经济性和排放性能,并使发动机工作点较好地集中在高效区域。研究内容可为操作者和专家制定模糊控制规则提供有效的手段。     

基于ADVISOR的混合动力公交车经济性仿真

混合动力汽车是目前解决环境污染和能源问题切实可行的方案。基于Advisor软件,先确定动力混合形式,在根据其各个性能的要求对发动机、电机等部件进行参数设计及整车建模。采用功率跟随式控制策略,在仿真软件Advisor里将各参数输入,并且修改相关控制策略,最终得到仿真结果。其结果表明与传统内燃机汽车相对比,串联式混合动力汽车无论是在动力性还是在燃油经济性和排放性能上面都有着较大的优势。     

汽油机涡轮增压与废气排放控制

涡轮增压技术与废气排放控制系统的结合,使汽油机的动力性能和燃油经济性能提高到一个新水平,废气涡轮增压技术在提高汽油机动力性能的同时,可以降低排放废气温度,降低排气噪音,改善燃油经济性,减少排放污染。结合目前采用废气涡轮增压技术的小排量汽车日益增多,维修中时常遇到涡轮增压器与废气排放系统相关联的故障,要解决这类问题就必须清楚其工作原理。     

新型CVT的开发与展望

现代汽车十分重要的研究课题是燃油经济性，较少的有害气体排放和日益增大的舒适性等要求。新型ＣＶＴ将可起到十分重要的作用．ＣＶＴ已经从理论上回答了现代汽车设计所需迫切解决的问题，其主要优点是改善了汽车性能、燃油消耗和排污。本文将讨论ＣＶＴ有关开发情况和未来的发展趋势。     

双离合器自动变速器整车建模与性能仿真

基于AVL/CRUISE性能仿真软件对配备了双离合器自动变速器(DCT)的汽车进行了整车建模,并进行了动力性与燃油经济性的仿真分析。与配备传统机械变速器(MT)汽车进行了性能对比分析,得到如下结论:在UDC循环工况下,配备DCT汽车比MT汽车燃油消耗增加了3.58%,动力性提高了1.9%。     

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。     

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....     

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.     

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.