增程式城市公交客车动力系统匹配设计与仿真分析

对增程式城市公交客车动力系统主要部件参数进行了详细的匹配,尤其对驱动电机从其运行要求的角度进行了细致的分析计算,为拓宽电机适用区间对整车构型增加了两档变速箱并对其传动比进行了匹配,根据城市公交车的运行特性设计了适合对应增程式系统的整车能量管理控制策略,并基于Cruise对所设计的车型进行了动力性和经济性仿真,仿真结果达到了预期设计要求。     

增程式城市客车动力系统参数匹配与仿真分析

某款纯电动城市客车在山区城市运行中存在动力性不足、行驶里程短等问题。为了能增强其动力、增加其续驶里程,对其动力系统进行了结构分析和参数匹配,提出一种增强其动力供给的增程式匹配方案,将原纯电动城市客车改造为增程式城市客车。利用Cruise软件建立增程式城市客车整车仿真模型,采用恒温控制策略,对所匹配的动力系统参数分别在三种不同的工况下进行纯电动模式和增程模式的仿真分析。结果表明,改造后的增程式城市客车的动力系统参数匹配较合理,其动力性和行驶里程均明显提升。     

增程式电动城市客车动力系统匹配与仿真

设计了一款增程式电动城市客车,为使设计车辆满足动力性与经济性要求,对车辆动力系统中的驱动电机、动力电池与增程单元进行了参数匹配,并提出了一种基于功率跟随式的增程式电动城市客车动力系统控制策略。在MATLAB/Simulink环境下建立了控制策略模型,利用CRUISE软件建立了整车模型,进行了车辆动力性仿真与循环工况仿真,确定了增程单元发动机工作的高效区间。仿真结果表明,车辆能够满足设计要求,使用功率跟随式控制策略能够提高动力电池充电的安全性和使用寿命。     

增程式电动汽车动力系统参数匹配与仿真分析

对某款增程式电动汽车的动力系统进行参数匹配,并应用AVL Cruise仿真平台搭建增程式电动汽车整车模型,进行仿真分析,验证这一增程式电动汽车的动力性和经济性.采用改进的非支配排序遗传算法对增程器的工作点进行优化,优化后增程式电动汽车整车燃油消耗量降低60.3％.     

增程式电动汽车动力系统参数匹配与仿真

为了使增程式电动汽车动力系统的关键部件驱动电机、蓄电池及增程器在最佳工作区域运行,首先在对增程式电动汽车结构分析的基础上,根据整车基本参数及性能指标要求,对动力系统各部件的参数进行匹配,然后在Cruise仿真软件中对动力性进行仿真。仿真结果表明,满足增程式电动汽车对动力性能指标的要求,参数匹配合理,为后续控制策略的研究及经济性仿真提供理论基础。     

增程式电动汽车动力系统参数匹配与仿真

增程式电动汽车驱动模式特别,其搭载的内燃机可驱动发电机补充电池电量,提高续驶里程。文章对某款增程式电动汽车的动力系统进行参数的匹配设计,并通过ADVIOSR软件进行仿真与分析,结果表明该动力系统设计合理,可满足整车动力性和经济性的要求。     

一种水陆两栖车的增程式动力系统设计与仿真

以水陆两栖履带车为研究对象,采用增程式结构设计混合动力系统。基于设计参数和性能指标,通过汽车动力学计算得出满足设计条件的动力系统功率需求和扭矩需求,进而对动力元件选型与匹配计算。基于CRUISE汽车仿真软件,建立增程式结构的整车模型,并设置工况仿真和进行性能指标验证。所设计的增程式动力系统满足设计指标,整车的动力性较好,满足续驶里程要求。为后续进行的实验室台架试验奠定基础。     

增程式电动汽车动力系统仿真匹配分析

电动汽车续驶里程过短仍是目前制约电动汽车推广应用的关键因素之一,而增程式电动车可以比较有效解决当前纯电动汽车续驶里程过短的问题。设计了一款增程式电动车,并对该增程式电动车的动力系统进行了结构分析和参数优化;基于CRUISE汽车动力性仿真平台,对设计的动力系统进行了仿真分析和验证。结果表明,所设计的增程式电动汽车动力系统可行,既能发挥电动汽车零排放、少用或不用石化能源等特点,又能有效满足用户对电动汽车续驶里程的要求。     

增程式电动车参数匹配与分析

针对增程式电动车研发中动力系统的参数匹配问题,以整车动力性和续航里程为设计目标,从电驱动系统、动力电池系统、内燃式增程器系统等方面出发,设计了增程式电动车动力系统参数,并以软件AVL CRUISE为仿真平台,采用增程器恒功率控制策略搭建了整车模型,验证了所设计的增程式电动车的整车动力性和续航里程。研究结果表明,车辆的最高车速、加速性能和爬坡性能满足车辆动力性能要求;车辆在10 km/h和15 km/h匀速工况下纯电动续航里程和增程模式的续航里程也满足车辆续航里程要求。     

增程式电动客车控制策略研究

在根据性能要求对某款增程式电动客车进行参数匹配和部件选型的基础上,分别借助AVL cruise软件和Matlab/Simulink软件搭建整车模型和控制策略,根据设定条件对车辆的三种工作模式进行切换,通过PID控制对增程模式下发动机的转速进行控制,从而达到车辆运行需求功率与发动机发出功率的动态平衡。通过AVL cruise和Matlab/Simulink的联合仿真,对所搭建控制策略的可行性进行验证分析。仿真结果表明,所搭建的控制策略实现了对整车的控制,达到预设目标,为进一步研究增程式电动客车的控制策略提供了理论依据。     

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.