基于某水下航行体包装箱的密封结构设计

对影响包装箱密封性能的因素进行了分析研究,结合包装箱的结构要求进行了密封面结构设计及密封条的设计,并设计了箱体上安装件的安装结构,利用有限元方法分析了包装箱主体(玻璃钢)结构机械强度,并对玻璃钢主体零件的成型工艺进行了研究,最后通过试验验证,确定了设计的可靠性,为类似产品(水下航行体)的包装、存贮提供了一定的应用参考。     

基于应力—强度模型某包装箱结构强度分析

产品在运输过程中,其包装箱需要承受产品的自重和冲击过载,包装箱的强度直接影响产品的可靠性及安全性问题。根据包装箱体在吊装、运输等环境下的工况,对某包装箱进行了强度校核。首先根据包装箱体结构的特点和易发生疲劳的强度区域,对模型进行合理简化,再利用有限元软件COMSOL对包装箱的结构强度进行计算分析,并根据计算结果评估包装箱的结构强度。结果表明:包装箱在吊装、海运等工况下,强度满足使用要求,包装箱的结构是安全的。     

天线阵面包装箱设计方法研究

天线阵面包装箱结构相对简单,但需要满足多种性能要求.文中研究了某大型天线阵面包装箱的结构形式及设计方法.首先对工程上常用的几种包装箱的结构形式进行了详细介绍,然后从外形设计、承载性能、周转方便性、环境适应性等方面对天线阵面包装箱的设计方法进行了阐述,并对分析的包装箱提出了改进设计方案,最后对包装箱设计中需要注意的铭牌标识、干涉检查、配合尺寸等需要重点关注的细节问题进行了进一步探讨.     

航空发动机包装箱设计与制备研究

为安全可靠地运输和储存航空发动机,适应现代化保障需求,设计了带有减振装置和密封结构的复材包装箱。利用有限元软件对包装箱箱体及支撑架进行强度校核,对减振系统进行模态分析。结果表明,包装箱具有足够强度,支撑架结构具有足够的刚度储备,说明复材包装箱能够有效保护发动机,满足发动机的运输和储存要求。总结了包装箱箱体成型工艺及流程,箱体制备工艺得到了验证。     

基于Modbus-RTU协议的包装箱检重管理系统设计

为确保每种产品都符合出厂要求,设计了包装箱检重管理系统。系统由上位机和下位机两部分组成,在产品包装箱入库前进行条码比对和称重检测,根据EAN-13条码判断产品种类,将称重值与预设值进行比较,若符合要求,则产品经过动态检重称,存入立体仓库;若产品不符合出厂要求,触发剔除器,将产品推下生产线,开箱检查;所有产品信息通过Modbus-RTU协议发送至上位机,存入Access数据库中,提供查询和追溯。     

大型整流罩铁路运输方式的研究

新型大尺寸整流罩的外径已达到4.2 m,传统的铁路运输方式无法满足运输要求。本文设计了一种由特制整流罩包装箱和改进性落下孔车相结合的新型运输方式。在满足铁路限界的前提下,首先对包装箱的加固方式进行设计,并对加固载荷进行计算;然后,介绍了对落下孔车的改进内容和满载车辆的动力学试验结果。实际应用结果表明:该方案能较好地满足新型整流罩的运输要求。为后续更大尺寸整流罩和其他航天产品的铁路运输方式提供了新思路,具有重要的指导意义。     

摩托车铁包装箱初探

自１９９６年以来,我们对国内外摩托车包装箱的状况,从设计、试验、制造到生产线包装、运输进行了考察和探索,并结合我国国情研制成功了摩托车铁包装箱。产品获得了国家专利,专利号为ＺＬ９７２３２６６７．７。１摩托车包装箱以铁代木的必然性据有关部门统计,我国年...     

抗事故包装箱缓冲结构厚度计算方法研究

为了降低放射性物质在运输与贮存中出现泄漏的风险,通常采用抗事故包装箱对其进行包装防护.介绍了抗事故包装箱跌落的数学模型和缓冲材料的力学性能,基于能量转化的思想分析了抗事故包装箱端面跌落、底面跌落和角跌落三种典型情况,给出了端面跌落和底面跌落时缓冲层厚度的计算公式,并对角跌落时缓冲层厚度是否满足设计要求的验证方法进行了分析,给出了有效的验证方法.计算方法和公式可为抗事故包装箱工程结构初步设计提供理论依据.     

某飞行器包装箱计算分析

某飞行器包装箱结构设计需要开展不同工况下的强度和变形数值分析,验证结构设计的合理性。文中针对某飞行器包装箱的几何模型,利用Hypermesh软件对包装箱的各个组件进行了有限元结构化实体网格划分,根据包装箱非运动状态承载和吊装状态承载两种工况条件,在商业有限元软件ABAQUS中完成载荷条件和边界条件的施加,计算包装箱强度和变形的强弱位置,对包装箱设计具有参考意义。     

机床包装箱合理设计初探

本文分析了机床包装箱的受力情况，认为我国现行包装规则和传统的包装箱设计理论存在谬误，提出了包装箱结构合理设计的新概念，为正确包装、储运机电产品，节省包装材料展示了新的前景。     

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。     

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.     

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.     

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.     

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...