并联式混合动力汽车(PHEV)动态协调控制方法硬件在环仿真

在指出并联式混合动力汽车(Parallel hybrid electric vehicle, PHEV)发动机与电动机动力耦合过程中存在的协调问题基础上,提出基于模型匹配控制的动态协调控制方法,开发出双驱动电动机结构的硬件在环仿真试验平台硬件系统和基于Matlab/Simulink/RTWT与Visual C 环境的软件系统,并建立PHEV动态协调控制方法硬件在环仿真试验台.对所设计的动态协调控制方法进行硬件在环仿真试验,试验结果表明,该动态协调控制方法能有效控制两个动力源的动力耦合过程,具有较高的转矩控制精度和很好的动态响应特性.     

混联式混合动力汽车整车控制器硬件系统设计

介绍了电源管理、CAN通信、信号处理及电磁阀驱动等硬件电路的设计方法,并针对某款混联式混合动力汽车,设计了混合动力汽车整车控制器(HCU)的硬件系统。硬件在环仿真结果表明,HCU硬件系统响应速度快、实时性强,能够准确、有效地控制发动机和电机等对象,实现能量管理和动力分配,完成各控制器之间的通讯,满足混合动力汽车整车控制系统的设计要求。     

汽车ABS混合仿真试验台的开发与研究

对汽车防抱制动系统（ABS）混合仿真试验台进行了系统分析,建立了用于硬件在环仿真的车辆模型、轮胎模型、路面模型以及ABS液压系统模型,并进行了硬件在环的仿真试验。把ABS实际部件嵌入到软件环境中进行混合仿真极大地扩展了软件仿真的功能,为ABS产品开发提供了开发工具和试验平台。     

CAN总线在混合动力汽车中的应用

结合混合动力汽车的特性,介绍了CAN总线及其通信协议,在对混合动力汽车CAN总线应用层协议分析的基础上,组建了CAN总线多主分布式控制技术的控制网络,并对CAN接口进行了软硬件方面的设计,最后通过硬件在环仿真对CAN通信进行了测试,结果表明CAN通信满足了混合动力汽车实时性和可靠性的要求.     

增程式混合动力系统能量匹配优化研究

在增程式混合动力汽车动力学分析基础上,在特定工况下,以系统效率最高为优化目标,建立整车模式切换规律。基于MATLAB/Simulink仿真平台建立仿真模型,仿真结果表明,该能量管理策略有效提高了混合动力汽车的燃油经济性和动力性。搭建了基于dSPACE的混合动力硬件在环试验系统,并开发数据采集及测控软件,完成了混合动力汽车基于特定循环工况的试验,验证了控制策略的有效性。     

基于Ⅵ的混合动力挖掘机试验测控系统设计

针对混合动力挖掘机试验台,研发基于虚拟仪器的综合性能试验测控系统.介绍该测控系统的硬件构成、软件平台及其试验应用效果.该系统对于非标准试验台的开发具有普适性以及很好的推广价值.     

整体式汽车电子驻车制动系统试验台设计

电子驻车制动系统(EPB)是汽车线控系统的重要组成部分,能简化汽车操作,提高汽车安全性。设计了一种整体式汽车电子驻车制动系统试验台,利用d SPACE实时仿真系统搭建硬件在环仿真平台,进行了电子驻车制动系统的控制仿真,并进行了相关的试验测试,测试结果表明本设计中整体式电子驻车制动系统试验台可以实现电子驻车制动系统各项功能。     

并联混合动力汽车再生制动控制器设计

针对某款并联混合动力汽车,提出并行再生制动控制策略.基于Freescale的HCS12系列16位单片机MC9S12DF256B,对并行再生制动控制器进行硬件设计和软件设计,通过硬件再环仿真试验验证了控制策略的可行性.采用并行再生制动控制器对系统进行控制,系统能够精确地分配前轮电机再生制动力,前轮摩擦制动力和后轮摩擦制动力,回收更多的制动能量.     

基于免疫算法的四驱插电式混合动力汽车控制策略多目标优化

为改善四驱插电式混合动力汽车的燃油经济性和排放性能,构建了基于规则的能量管理控制策略,并建立了整车仿真模型;将多种群协同进化的思想引入免疫算法,提出多种群免疫算法,并运用该算法对四驱插电式混合动力汽车的控制策略进行了多目标优化;在dSPACE实时仿真系统上对优化前后的控制策略进行了硬件在环仿真实验。结果表明：优化后的控制策略控制效果良好,且发动机的燃油消耗降低了12.71%,HC、CO以及NOx的排放分别下降了15.74%、15.92%和12.69%。     

汽车ABS控制器性能测试系统设计

利用MATLAB与LABVIEW联合仿真,结合硬件在环仿真技术,搭建了汽车防抱死制动控制器试验台,对ABS工作模式和故障状态进行了试验分析,能够初步体现控制器的性能特征和状态参数,验证控制器运行的正确性,证明硬件在环仿真试验系统的可信性和实用性。     

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.     

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.