誓夺杆位戴纳派克SD系列摊铺机

戴纳派克全新SD系列摊铺机是集合了戴纳派克70年路面施工经验和当今最先进技术的路面摊铺设备,也是根据客户需求量身打造的全新履带式摊铺机,在细节上和质量上的精密设计为客户提供了世界顶级水平的摊铺机。     

基于有限元法的摊铺机车架结构分析

针对大型复杂摊铺机车架在设计过程中结构强度和刚度较难保证,而使车架在施工过程中易出现变形及开裂等问题,为了提高摊铺机整机的施工效果和可靠性,开展了基于有限元法的摊铺机车架的结构分析工作。采用有限元分析法,根据摊铺机的多种工况,对摊铺机车架进行了静力分析及模态分析,获得了车架的应力应变云图、固有频率及振型,为结构优化提供了基础;同时针对车架结构的薄弱环节,提出了在前后板增加筋板及增大左右侧梁横截面尺寸,以提高车架整体结构刚度的改进方法。研究结果表明:在设计初期预先进行结构的强度分析和校核,可从源头上避免部分设计缺陷和不足,为样机的设计和研究提供理论依据,对提升摊铺机的工作效能和稳定性具有实际意义。     

基于模糊自适应PID的摊铺机行驶控制系统研究

摊铺机的恒速与直线行驶性能提高,对路面施工质量的改善有着重要作用。将改进的模糊自适应PID算法应用到摊铺机行驶控制器的设计中,在此基础上,引入左右履带行驶距离差相关联的方法,共同提高摊铺机的行驶性能。详述了算法的原理和实现方法,完成了系统的软硬件设计与调试。通过实验证明,该算法在摊铺机行驶控制系统中应用的可行性和有效性。     

摊铺机履带液压张紧研究

本文对摊铺机履带液压张紧进行研究.在原摊铺机履带液压张紧的基础上设计一套具有自动张紧、保压持久可靠、张紧零功率损失、防冲击、低成本的液压张紧系统,能够很好地保证摊铺机工作(恒速行走)时履带所受的张紧力保持恒定.提高摊铺机摊铺平整度性能.     

摊铺机状态监测与故障诊断初探

本文对机器状态检测与故障诊断技术进行了分析,提出在摊铺机上运用信息融合技术,采用模糊推理理论进行机载在线故障监测和诊断的方案,并利用C 程序设计语言编制了模糊故障诊断程序作为摊铺机监控系统的子程序。     

路面机械

<正>GJ20105130沥青摊铺机作业技巧对路面平整度的提高[刊,中]/杨修志…//建设机械技术与管理.—2010,(1).—85～86结合沥青路面摊铺作业实践,分析摊铺机性能及操作对路面平整度影响,提出摊铺机作业技巧及提高平整度控制措施。参4     

滑模摊铺机施工工艺与控制关键策略研究

为修筑质量更高的水泥混凝土路面,介绍了一种滑模摊铺机施工工艺,并以某道路工程为例,探究滑模摊铺机施工应用与其关键控制策略。研究表明,滑模摊铺机施工工艺对提高道路行车舒适度、路面平稳度和设计通行能力等作用明显,值得推广应用。     

智能沥青混凝土摊铺机远程在线监控系统的研究

本文结合LTU90A沥青混凝土摊铺机CAN总线技术的特点,论述了利用CAN总线技术和PC机的各自优点建立沥青混凝土摊铺机远程在线监控系统的过程,这对于提高广大工程机械的监控和故障诊断技术水平具有重要意义.     

工程机械远程智能服务平台及其在摊铺机上的应用

正随着互联网技术的发展,利用大数据、数字化、信息化、智能化技术已成为提升工程机械性能的发展趋势,传统的筑路机械行业如何改变思维,利用互联网技术提升服务品质,已是各主机厂研究的课题。摊铺机结构复杂、技术含量较高,其实现智能化是争取市场的关键因素。本文以摊铺机为例,讲述其与互联网完美结合,在摊铺机上安装工程机械远程智能服务平台终端,实现了远程监控和调试,保证了摊铺机的可靠运行,提高了产品竞争力。     

基于CAN总线的沥青混合料摊铺机智能控制技术

采用控制器局域网络(CAN)总线技术设计出沥青混合料摊铺机智能控制系统,实现了摊铺机的恒速控制、输分料控制、自动找平控制等,并具有一定的故障诊断功能.实践证明,所设计的智能控制系统具有接线简单、维修方便、智能化和可靠性高等优点,深受广大用户的欢迎.     

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.