运煤列车防冻液喷洒装置的结构设计与有限元分析

针对目前运煤列车防冻液喷洒装置不能升降且在停止喷洒时喷头中残液滴漏等问题,设计了一种多功能式防冻液喷洒装置。运用Pro/E软件建立了喷洒装置的三维模型,并将支撑立柱导入到ANSYS Workbench软件中进行了静态分析和模态分析,得到支撑立柱的位移分布情况、固有频率和振型,验证了结构的合理性,并为优化结构设计提供了可靠的理论依据。     

HBP—160热镦机备用水箱水位自控装置改造

当电网停电时,HBP—160热镦机加热炉水冷用供水泵停止供水,造成炉温急剧上升、感应圈表面绝缘层损坏。针对以上问题,设计了备用水箱自动控制装置,使问题得到解决。     

电梯轿厢减振装置浅析

为改善现有电梯的乘坐舒适性和稳定性,针对现有电梯轿厢从运动转向停止容易产生较大振动的缺点,设计一种电梯轿厢减振装置,建立轿厢减振的电梯系统动力学模型。结果表明：采用轿厢减振装置的电梯与现有技术相比,能较好的降低电梯从运动转为停止时产生的振动,确保乘坐舒适,同时延长电梯使用寿命。     

具有防撞伤功能的安全漫步机设计分析

针对使用者从漫步机上下时,摆动的脚蹬极易伤到使用者的腿;或者在使用漫步机时容易伤到前后方经过的行人等安全隐患,设计了一种具有防撞伤功能的安全漫步机。该漫步机采用双层保护结构,同时采用脚离停止装置和手动缓停装置进行制动。脚离停止装置采用碟刹进行立即制动,手动缓停装置利用刹车片进行阻尼缓停。该装置能根据使用者使用的不同情况有针对性地进行降速、降幅等保护。同时,该装置还具备自供电功能,分别将使用者运动产生的机械能和太阳能板收集到的太阳能转化为电能,并存储在蓄电池中,供装置使用,节能环保。装置自带健身计时装置和安全警报装置,保障了使用者使用的安全性和舒适性。     

带有液压储能装置的客车怠速停止起动系统

汽车怠速停止起动系统(Idling Stop & Start System,ISS)作为一种新型节能技术产品在国内外得到重视和发展.当汽车停车时,如遇到堵车或红灯时,怠速停止起动系统通过自动关闭发动机来节省燃油,并在脚离开制动踏板时发动机义重新起动.在介绍汽车怠速停止起动系统的结构组成与工作原理基础上,分析目前怠速停止起动系统存在的不足--怠速停止期间车内空调不能运行.为了保证在发动机怠速停止期间空调的正常运行,保持车厢内的舒适性,设计了一套具有液压储能装置的怠速停止起动系统.     

机械-液压式机床主轴定向停止机能装置

在自动生产线上,为了使机床切削加工自动线中主轴上的夹具总能停止在固定的方向和位置,采用了机械-液压式机床主轴定向停止装置,并对该机能装置的传动结构和工作原理进行了论述。     

基于远洋渔业水产品加工车间智能运输小车的优化设计

以远洋渔业水产品加工车间智能运输小车的驱动装置为研究对象,针对传统水产品加工车间选用人工运输或者其他运输器械等运输成本高、设备笨重、运力有限、运转范围及环境复杂等问题与不足,设计出了新型智能运输小车的驱动装置。从理论操作与试验结果比较表明,这种装置具有操作简单、使用灵活,智能化程度高,能独立完成运输过程中的前进、后退、停止功能等复杂程序。     

机床联动断电装置

我厂设备科电器修理工、先进生产者陈信芳同志,在去年12月改进了机床停车同时自动停止马达运转的装置。这种装置很简单,在各种车床、牛头刨床、钻床上都可以应用,只要在这些机床的适当地位上装一个浦司开关,就可以利用操纵克拉子的手柄,随车头的开动和停止而开动和停止电动机运转。     

柴油机风扇电子自动控制装置改进设计

针对柴油机对工作温度要求高、易损坏、寿命短,从而影响生产的情况,对柴油机风扇电子自动控制装置进行了改进设计,采用温度传感器进行水温检测,通过驱动电磁阀来实现对柴油机风扇的起动和停止操作,使柴油机的水温较为恒定,以保证设备的安全运行。     

掘进机滚筒驱动机构间歇润滑装置

在滚筒驱动机构内部设计一套强制润滑装置,当滚筒驱动机构的抬起角度超过一定限度,油浴润滑不能满足主轴承的需要时,该装置能够自动开启,改善主轴承润滑状况,而在主轴承的润滑条件恢复后,该装置自动停止工作。介绍该滚筒驱动机构间歇润滑装置及其核心部件重力离合器的结构和工作原理。     

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...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

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.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.