基于LS-DYNA的铣削过程三维仿真研究

金属铣削是一个弹塑性变形和断裂的复杂过程，基于LS-DYNA对铣削加工系统建模，对系统进行动态三维仿真，并对7075铝合金材料进行铣削力动态实验测试，将其与仿真结果进行比较，验证仿真计算可靠性，对铣削温度分布进行了分析，通过调整仿真铣削模型的参数，对铣削过程进行优化，降低铣削力的大小，保证铣削过程的稳定和加工的质量，提高切削效率。     

复杂地质环境下高边坡稳定项目中抗滑桩运用分析

为切实提升边坡稳定性，降低滑坡地质灾害的发生频率，保证各行业工程施工建设的安全性及高效性。本文将对复杂地质环境下高边坡稳定项目中抗滑桩运用进行分析与研究，首先对其研究意义进行阐述，其次对国内外研究现状进行解析，再次对其高边坡稳定性进行简析，最后对其抗滑桩在高边坡稳定项目中的应用进行分析，以供参考与借鉴。     

一种改进的煤矿上位机智能监视系统设计

传统视频监控只是摄像头代替人对所监控目标进行视频拍摄，人工对视频中图像进行观察发现异常再进行通知人员进行处理，此种监控方式缺乏实时操作性并且效率低下，对场地设备和人员安全性无法保证。根据煤矿遥视系统无法对馈电开关、综保开关等设备状态进行实时监测的问题，提出一种改进的智能遥视监控系统。基于Snap7与OPC通讯规约，在上位机Python环境中进行通讯协议定义，实现上位机Python与西门子PLC进行数据交互。同时，借助图像处理算法在上位机组态界面中对开关运动状态进行实时监测，当监测到危险区域馈电开关状态发生突然变化时，能够对PLC下发报警置位指令，发出声光报警，警示该区域人员对突发情况能够及时进行处理。     

等离子弧表面强化机器人实验研究

基于等离子弧表面淬火的工艺要求，设计出四自由度表面强化机器人。采用运动控制卡进行运动控制，在VC＋＋环境下进行机器人的轨迹规划，通过改变不同的运动轨迹，等离子参数进行实验，将实验结果进行比较，找到最佳的方案，具备一定的研究意义。     

自动上料装置桁架轻量化设计

针对某自动上料装置的桁架进行了轻量化研究，通过对桁架进行有限元分析，利用多目标优化方法对桁架进行优化设计，在满足桁架强度以及变形的可靠性前提下，对桁架进行尺寸优化，最终将桁架减重22.8%，节约了材料的使用成本，同时达到了轻量化的效果。     

巡检机器人升降装置设计与分析

基于螺旋传动机构设计了一种用于巡检机器人的升降装置。首先，根据具体的设计需求确定了升降装置的整体结构，并对其工作空间进行了简要分析。对升降装置进行了运动学分析，建立了运动学模型，并利用MATLAB进行了运动学仿真，确定了升降速度与减速电机输出转速之间的关系。然后，利用ANSYS软件对螺杆螺母组成的螺纹连接模型进行了有限元应力分析，验证了该升降装置设计的可行性，并通过对螺纹杆进行模态分析，验证了其升降工作的稳定性。最后，进行了螺旋传动机构实物样机的研制，并对升降装置整体安装实物进行了测试试验，验证了该升降装置设计的合理性。     

缸筒内径对油气弹簧阀系参数设计的影响

利用车辆单轮簧上质量和最佳阻尼比系数，得到油气弹簧开阀压力。利用开阀压力与阀片变形以及流量之间关系，建立油气弹簧阀系参数解析设计公式，对阀系参数进行解析设计。通过对缸简内径对阀系设计参数的影响进行定量分析，建立了阀片厚度和节流缝隙影响系数，利用该系数可对阀系参数进行推算设计。通过实例，对阀系参数进行了解析设计与影响系数推算设计，并对2种方法设计值进行了比较，对阀系设计参数进行校核，对所设计油气弹簧进行了特性试验。设计和试验结果表明，阀系参数解析设计方法是准确的，影响系数推算设计方法是可靠的，对油气弹簧设计开发具有重要参考价值。     

基于LS-DYNA的电动汽车电池挤压损伤仿真分析

新能源汽车电池包在使用过程中，会因为一些轻微碰撞、冲击或者长期振动等原因，对内部电池单体造成一定的影响，但影响程度不易观察，如何对受损车辆的电池包损伤程度进行合理性的判定，甚至留出一个安全阈值，对于用户来说至关重要。为了对电池系统的安全状态进行评估分析，通过对某高比能电池进行试验并通过LS-DYNA进行仿真分析两个方面建立评价体系，首先对其进行放电容量检测，确认样品信息的一致性，然后对电池单体进行挤压试验与仿真分析，挤压过程中分析其受力变化特性与挤压推进位移的关系，最后挤压至单体热失控，因在试验过程中无法判断挤压后电池变形的真实情况，进而通过仿真分析的方法，判断电池在挤压过程中的变形量演变过程。同时根据挤压试验得到的受力情况，用有限元的方式进行挤压仿真分析，提取变形量、应力等变化特征，对挤压过程中的电池损伤程度演变机理进行了分析。     

基于有限元仿真的手机超薄透明翻盖结构设计研究

跌落试验是手机产品环境实验的一个重要测试项目，其一般在产品开发后期进行，属于实物实验。采用有限元仿真，可以在实物样机出现前进行，能有效发现设计缺陷，提高产品开发速度。运用HyperMesh和Abaqus软件进行手机跌落仿真，得到手机超薄透明翻盖在不同工况跌落时的应力应变情况，通过与许用应力应变比较，分析翻盖在跌落时的可靠性，并与实际的手机跌落试验进行比较，验证了仿真分析的准确性，并确认了透明翻盖结构设计的合理性。     

巧用螺钉卸换密珠导轨的钢球保持架

我院被确定为山东省紧缺制造人才培训基地，拥有卧式车床100多台。在日常使用过程中，为了保证普通回转顶尖的精度，要经常对顶尖进行保养。需要加油的进行加油，有的需要进行轴承更换，有些不仅需要换件，还要对60。锥面进行修复。我们革新了装夹方法，在车床上进行车削，既易装夹，又便于卸下顶尖，此方法适合小批量修复，能够保证顶尖跳动达到出厂精度。每个顶尖可以修复多次，这样就延长了顶尖的使用寿命，具体方法如下。     

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...     

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...     

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。     

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。     

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.     

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.     

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。     

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....     

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.