发动机废气能量回收系统研究

废气能量回收是提高汽车节能减排效果的有效手段之一。建立了发动机废气涡轮发电回收系统模型;系统采用旁通阀和可变截面涡轮技术来控制发动机排气背压和涡轮机转速。针对某企业的某款车用发动机,利用有关数学模型及数学分析法对涡轮机进行了选项设计,确定了涡轮机的基本参数,根据基本参数选定某国产H1A涡轮机;再根据涡轮机有关输出参数对发电机及步进电机进行了选项设计。建立了废气能量回收系统仿真模型,对整个系统进行了仿真分析。结果表明,混合动力汽车发动机废气能量回收可以实现废气能量的回收利用。通过两种典型工况的仿真分析,其最高回收功率可达(1.7~1.9)k W。     

汽车废气涡轮增压系统浅谈

随着科技的发展,废气涡轮增压技术在汽车发动机上的应用越来越广泛,在能源危机越来越严重的今天,废气涡轮增压技术合理的利用尾气能量,在不增加能耗的前提下,有效的提高了内燃机的能源利用率。本文针对汽车废气涡轮增压技术的原理和结构进行论述,并就废气涡轮增压技术的发展趋势进行浅要分析。     

汽油发动机废气涡轮增压器的基本控制模型

汽油发动机的废气涡轮增压器是利用排气的能量推动涡轮带动压缩机对进气进行增压,提高进气量从而提高发动机动力的装置。本文简要介绍了电控系统中汽油发动机废气涡轮增压器的基本控制模型,包括预控模型、PID控制模型、自学习模型。     

涡轮增压器减振降噪解决方案

涡轮增压器是指安装在发动机上,利用发动机废气的能量来压缩空气,通过增加发动机的进气量来提高发动机功率的高效节能部件。随着欧IV和更高排放标准在中国的实施,涡轮增压发动机将日益普及。增压器噪声危害增压器最高转速可达30万r/min,由于叶轮与气流的相互作用,转子的动不平衡以及轴承的非线性油膜力等因素,使增压器在使用过程中产生各种噪声。目前在中国各城市,当装有增压器的载货汽车或公交车     

车用涡轮增压器叶轮的五轴数控加工方法研究

针对汽车发动机废气涡轮增压器中的涡轮叶轮,进行了涡轮叶轮五轴数控加工技术的研究与探索,有效提高了涡轮增压器叶轮加工质量,避免传统铸造加工方法存在的不足。     

涡轮增压器

涡轮增压器：它本身并不是一种动力源,而是利用发动机排出的废气能量驱动涡轮高速旋转,带动与涡轮同轴的压气机叶轮高速旋转,将新鲜空气压缩输入发动机气缸,这样就增加了燃烧室内氧气含量,从而改善了燃油的燃烧条件,提高了发动机功率,降低了燃油消耗,减少了废气有毒物质的排放,并可降低噪声,从而最终实现环保节能、提高功率的作用。     

一种多目标的新型汽车起重机系统能量回收装置研究

为了降低汽车起重机在行驶和回转阶段的能量耗散,提高汽车起重机的节能水平,将制动过程与回转过程能量作为系统能量回收对象,建立一种多目标新型汽车起重机系统能量回收装置,研究汽车起重机系统能量回收装置结构设计、能量回收流程和策略,对各目标过程能量回收性能进行计算,最后通过实际参数进行实际验证。     

接触网作业车废气涡轮增压器发动机常见问题与对策分析

废气涡轮增压器作为目前发动机的主要构成部分,发动机运转条件下极大增加了发动机进气压力和进气量,充足的进气量和进气压力能改善发动机的燃烧效果,在不改变发动机排量的情况下,有效提高发动机的输出功率和燃油经济性。本文以特定的视角,对接触网作业车废气涡轮增压器型发动机运用中的常见问题和对策进行了论述。     

皮尔博格电动压缩机提高发动机效率及驾驶乐趣

正德国KSPG集团旗下品牌皮尔博格新近研发成功一款电动压缩机,用于增加发动机气缸空气压力。该产品可应用于汽油和柴油发动机,无需依靠废气产生的能量就能增加进气压力,因此可以显著提高发动机效率,增进机动车的性能。依靠这种电动压缩机可以充分实施车辆微型化。相比于传统的废气涡轮增压器,新款电动压缩机以即时快速增压见长。一般的多级废气涡轮增压器价格昂贵,并需要有很大的安装空间,而新款电动压缩机体积小、价格低,是传统增压器很好的替代品。新型电动压     

JK60S可变截面涡轮增压器

涡轮增压器是利用发动机排出的具有一定脉冲能量的高温、高速废气驱动增压器的涡轮高速旋转,带动与涡轮同轴的压气机叶轮高速旋转,吸入新鲜空气压入发动机气缸,即提高发动机进气压力,增加进气量,使燃烧更充分、更完全,降低排放污染,是一种节能、增效的高科技环保产品。发动机进入欧Ⅳ排放     

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.     

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....     

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.     

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.