基于扭杆弹簧的水冲洗车翻转楼梯设计

根据地铁冲洗车上搬运和安放辅助小车的具体任务,设计一种可翻转的楼梯来满足所需的要求。通过力学分析,设计一种扭杆弹簧用于楼梯的翻转,该扭杆弹簧可使楼梯翻转至水平状态时,其扭力矩与楼梯和小车产生的重力矩保持平衡。在翻转过程中,扭杆的弹性势能与楼梯的自重势能相互转换,可在很大程度上减小人工推力,降低操作者的劳动强度。     

汽车下翻尾门的性能提升

针对汽车下翻尾门关闭力大、开启速度不受控及开启到末端震颤等问题,运用TRIZ对下翻尾门的关键问题进行优化,引入了扭杆机构及阻尼器在汽车下翻尾门系统上的应用,且运用Abaqus软件对扭杆机构进行强度分析.结果表明:扭杆机构及阻尼器的引入使得尾门关闭力由99 N降低至46 N,开启平稳且到末端时无震颤,极大程度地提升了尾门...     

扭杆弹簧在行李箱盖系统中的设计与应用

扭杆弹簧即为一端固定而另一端与工作部件连接的杆形弹簧,主要依靠扭转弹簧力来吸收震动能量。扭杆弹簧在汽车制造业已经有非常广泛的应用。重点介绍扭杆弹簧匹配鹅颈式铰链作为汽车行李箱盖开启助力机构,在汽车开发中的设计方法与应用。     

全海深载人潜水器舱门启闭机构研究

目前,彩虹鱼全海深载人潜水器正在开展。载人舱的启闭机构,是保障舱门正常开启和关闭,密封可靠的关键机构。要求同时具备在不借助外力辅助作用下实现舱内人员手动开启和关闭舱门,舱外人员应急开启和关闭舱门等多重功能。启闭机构还能通过平衡方式减少人力,防止舱门关闭时误伤舱口围栏密封面,并能轻松锁止。本文主要针对全海深载人潜水器舱内启闭机构的功能要求,研究分析启闭机构使用过程中的受力特性,扭矩平衡关系。从人机工程要求出发,给出合适的扭矩要求,并通过试验验证了设计的可靠性和人员操作的舒适性。     

某型民用飞机舱门外手柄机构研究分析

舱门外手柄安装在飞机机身外表面,用于人们从飞机外部打开或关闭舱门.外手柄机构是飞机舱门上所有机构的"开关",其设计的好坏会直接影响到整个飞机舱门机构的安全性和功能性.文中介绍一种在手柄把手内部集成了多套四杆、离合锁、弹簧杆及调整等元素的功能完整、安全并且节省空间的外手柄机构.对其功能、设计要求、机构原理设计及分析等几方...     

基于EXCEL的汽车行李厢盖扭杆弹簧开发程序

通过对装备扭杆弹簧的行李厢盖系统的受力分析，建立起了用户在开关行李厢盖时，手部作用力与行李厢盖开启角度之间的数学关系。并针对两种不同的扭杆弹簧系统分别进行了阐述，还介绍了在以上研究基础之上开发的一种基于Excel的行李厢盖扭杆弹簧的开发程序。     

汽车悬架上的扭杆弹簧及其应用

扭杆弹簧在汽车悬架上的应用越来越广泛,这是因为扭杆弹簧具备结构简单、质量较小且无需润滑等优点。目前,扭杆弹簧随着制作工艺和技术的发展也在不断提高自身的最大工作应力。扭杆弹簧拥有较大的弹性极限,疲劳极限也很有效。扭杆弹簧受到冲击时所表现出韧性很强大,同时具备良好的热处理性能。本文将对汽车悬架上的扭杆弹簧进行分析并且深入探讨其在汽车中的具体应用。     

基于Simcenter3D的舱门刚柔耦合动力学仿真分析

采用NX Simcenter3D软件建立舱门刚柔耦合动力学模型,得到各构件的运动数据及路径,并与实物模型对比调试,以保证该设计方案的可行性及安全性能.解得每一运动副各时刻所传递的力与转矩,确保舱门开启时所用手柄力矩大小及移动轨迹满足舱门使用需求.对舱门结构关键部位建立柔性体,创建动态耦合模型,对薄弱部位进行仿真分析、计算刚度与强度校核,为舱门机构的改进设计提供依据.     

基于Simcenter3D的舱门刚柔耦合动力学仿真分析

采用NX Simcenter3D软件建立舱门刚柔耦合动力学模型,得到各构件的运动数据及路径,并与实物模型对比调试,以保证该设计方案的可行性及安全性能.解得每一运动副各时刻所传递的力与转矩,确保舱门开启时所用手柄力矩大小及移动轨迹满足舱门使用需求.对舱门结构关键部位建立柔性体,创建动态耦合模型,对薄弱部位进行仿真分析、计算刚度与强度校核,为舱门机构的改进设计提供依据.     

扭杆弹簧式轿车行李箱铰链保持力分析

运用理论分析和计算机辅助设计手段,研究自由杆式扭杆弹簧铰链的工作原理及力学计算,给出自由杆式扭杆弹簧平衡机构的设计校核方法,通过分析行李箱盖开启的三种模式及其优缺点,给出一种改良行李箱盖平衡区域的方法。经过优化后可以有效避免行李箱盖越过平衡区域,保证行李箱盖可以保持在开启状态,避免在风力或斜坡上自动落下伤人发生。     

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.