WTC5380TSM型工程车辆沙漠通过能力的试验研究

以我国西北部沙漠为样地测定了沙土的物理-力学性质,以WTC5380TSM沙漠车为对象进行了沙漠通过性的研究,给出了切线牵引力和行驶阻力的计算公式,以挂钩牵引力和牵引性系数作为通过性的评价指标.研究表明,WTC5380TSM沙漠车在该沙漠中有较好的通过性能,能够满足交通运输作业的要求.本文的研究方法还可以预测WTC5380TSM沙漠车能否在其它沙漠地区完成行走作业.     

WTC5380TSM型工程车辆沙漠通过能力的试验研究

以我国西北部沙漠为样地测定了沙土的物理一力学性质，以WTC5380TSM沙漠车为对象进行了沙漠通过性的研究，给出了切线牵引力和行驶阻力的计算公式，以挂钩牵引力和牵引性系数作为通过性的评价指标。研究表明，WTC5380TSM沙漠车在该沙漠中有较好的通过性能，能够满足交通运输作业的要求。本文的研究方法还可以预测WTC5380TSM沙漠车能否在其它沙漠地区完成行走作业。     

防风固沙草方格铺设机器人沙漠通过性研究

以我国北部沙漠为样地测定了沙土的物理-力学性质,自行研制的防风固沙草方格铺设机器人为对象进行了沙漠通过性的研究,给出了切线牵引力和行驶阻力的计算公式,采用挂钩牵引力作为通过性的评价指标,进行了仿真计算.理论计算与现场试验的结果表明,机器人在该沙漠中有较好的通过性能,能够满足草方格铺设作业的要求.计算方法适用于各种沙漠地区预测该机器人能否行走作业,可供用户购置该机器人时参考.     

SL1400沙滩车牵引通过性分析

为了解决沙滩车辆在沙地通过能力的问题,结合车轮沙土相互作用的力学分析,给出了切线牵引力和行驶阻力的计算公式,以挂钩牵引力和牵引系数作为通过性的评价指标。本文的研究方法可以预测SL1400沙滩车能否在沙地完成行走作业,避免车轮滑转下陷。     

WTC5151TSM型沙漠运输车发动机支撑架结构改进

正1.存在问题及原因分析(1)存在问题长庆物探处现有32辆沙漠运输车,其中WTC5151TSM型沙漠运输车有27辆,占总数的84.3%,利用率达85%以上,是沙漠地震勘探的主力运输车。但是该型沙漠运输车经长期使用后,频繁发生变速器底部横梁开裂、前钢板弹簧后吊耳断裂、前轮胎异常磨损、发动机水箱风圈被风扇扫裂等故障,严重影响了地震勘探生产任务。该型沙漠运输车部分损坏部位     

96头钢轨打磨列车动力车设计研究

针对96头钢轨打磨列车的运用特点,研究提出了一种具有液力传动和液压传动双模式牵引功能的动力车。该动力车既能提供高速运行的牵引力,满足打磨列车快速高效到达作业现场的需要,又能提供打磨作业运行时所需的低恒速牵引力,保证打磨列车的打磨质量和精度。     

定位车牵引力计算和动力分析

定位车在翻车机系统中,是牵送重车供翻车机翻卸的主要设备。定位车牵引力的大小关系到整个翻车机系统翻卸能力。这是因为在每一列重车翻卸中,都包括初始拨车摘机车头、空车完毕排空车和调车的辅助作业时间。长编组的列车可减少辅助作业时间,从而提高港口的翻卸能力。对于长编组的列车就要求定位车有与之相匹配的牵引力。在参考现有的比较成熟的动力学分析方法及车辆计算理论,以国能黄骅港4期重载列车的定位车系统为研究对象,给出详细的求解方法。对定位车承受载荷、功率校核分析,并结合实际明确了实际设备工况中不确定的变量很多,理论设计时要尽可能考虑全面,安全系数要尽量取高一些。     

三角形橡胶履带车轮式越野车通过性研究

针对轮式越野车在沼泽、雪地、沙漠等特殊地域通过性差的问题,以某型军用吉普车为对象,在不改变原车结构条件下,通过换装三角形橡胶履带式车轮装置,进行特殊地域牵引能力计算和越障性能分析,以及与原车通过性的对比分析,验证三角形履带车轮的通过性优势,为进一步改善该类车辆的越野通过性奠定理论和技术基础.     

08-32捣固车作业走行驱动几种改造方案的探讨

分析了08-32捣固车作业走行驱动存在的运动不同步和牵引力不均衡的问题,提出了对走行液压马达进行重新匹配的几点建议,并探讨了改造过程中可能遇到的问题及对策。     

考虑轮轨黏着变化的货运列车纵向动力学仿真

为研究黏着系数对纵向动力学的影响,建立“1+1”型2万吨重载组合列车计算模型,引入剩余黏着力评价机车牵引力的发挥,研究了黏着限制、曲线黏降及曲线润滑因素影响下的黏着系数变化及其可能引发的列车纵向动力学性能差异。结果表明：在直线牵引工况下列车牵引力提升由于黏着限制而变缓慢,所发挥最大牵引力下降,单机车最大牵引力由380 kN限制到272 kN,拉钩力最大值由800 kN减小到595 kN;在R400 m小曲线牵引工况下,牵引力应从第7档位降低到第6档位,确保机车安全通过;考虑曲线润滑时,牵引档位更低：摩擦因数为0.075和0.10时机车降低档位对应为第2,3档位;摩擦因数为0.125时头部和中部机车通过曲线需分别降低到第4,3档位。由于曲线牵引各工况下发挥的最大牵引力相同,拉钩力最大值差异较小。在纵向动力学计算中,列车牵引力利用和黏着系数变化密切相关,轮轨黏着不足将限制机车能发挥的最大牵引力,进而影响车钩力大小。     

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.