某重卡前端牵引装置强度分析及优化

结合国标GB/T 28948-2012《商用车辆前端牵引装置》与新开发车型的实际情况,明确了该牵引装置的性能要求,并对其进行有限元强度分析和试验。在对标结果吻合较好的情况下,提出优化方案,在满足性能要求的情况下,实现降质量11 kg,达到了优化产品性能的目的。     

中低速磁浮车辆牵引装置分析

对中低速磁浮车辆牵引装置的主要结构及功能的分析,得出其相应载荷参数,再采用有限元分析方法对其主要承载结构进行强度校核,并对牵引装置安装螺栓的连接强度开展校核,验证了牵引装置结构设计的可靠性。     

基于ANSYS Workbench的自走式山地微型水稻联合收割机结构的有限元分析

基于Solidworks软件平台建立自走式山地微型水稻联合收割机机架结构的几何模型,应用有限元分析软件ANSYS Workbench对机架结构进行有限元分析,得出机架结构在承受负载作用时的整体位移和应力分布状态,获取机架应力出现最大值的位置,并用强度校核理论对机架结构的应力分析结果进行了校核,结果表明机架结构的设计符合强度要求。机架某些部位的强度富裕,尚有优化空间。有限元分析结果可为今后机架结构或材料的改进提供参考理论依据。     

基于LS-DYNA的汽车安全带固定点强度分析

建立某款CDV车型后排安全带固定点强度分析的有限元模型,利用LS-DYNA软件对安全带固定点强度试验过程进行仿真。结果显示安全带上固定点前向位移超出法规要求范围。进一步分析该固定点前向位移超标的主要原因,提出了座椅及车身结构的改进方案,结果表明改进方案能够满足法规要求。     

海洋地磁场矢量测量仪支撑装置结构设计与有限元分析

为增强海洋地磁场矢量测量仪支撑装置结构稳定性,消除安全隐患,根据设计要求,运用有限元分析方法,针对测量仪海试中出现的问题,对原有支撑装置结构进行改进设计和材料选择。运用ANSYS软件建立了一种适合于整体强度分析的有限元模型,得到了新型支撑装置的位移和应力分布云图。校核结果表明:新型支撑装置从整体结构到关键部件均满足4 500 m水深海试的强度和刚度要求,多次海试也证实了新型支撑装置具有足够的承载能力和安全性,从而有效地实现了对海洋地磁场矢量测量仪支撑装置的结构创新设计。     

汽车离合器踏板构件的有限元分析与优化

为验证某款新开发的离合器踏板的可靠性,建立了离合器踏板构件的有限元模型,按照法规对踏板构件的性能参数要求,利用HyperMesh软件对其进行侧向位移、刚度和强度的仿真计算。仿真结果表明踏板的刚度值不能满足法规要求,最大应力超过了材料的屈服强度。提出了材料改进和结构优化方案,并对改进后材料和结构优化后的离合器踏板进行仿真验证,结果表明其满足了法规和实际工况的需求。     

ANSYS在超高压液压增力装置分析中的应用

针对一种超高压液压增力装置在参数设计和优化过程中的强度和刚度校核问题 ,使用有限元分析软件ANSYS进行计算分析 ,得到输出缸各部位的应力及位移分布图 ,并进行了变参数设计     

基于ANSYS的风电机组叶片锁定装置 优化分析

叶片锁定装置的承载能力直接关系着风电机组维护人员的生命安全,因此,需要对其承载能力进行校核。利用ANSYS软件对叶片锁定装置进行有限元分析,根据有限元计算结果、应力分布状态、变形情况,结合对叶片锁定装置的受力分析,并考虑制造成本,对叶片锁定装置的结构进行优化。优化后的叶片锁锁定装置应力大幅减小,达到了使用要求,螺栓个数由5个减少为3个,在简化维护操作的同时降低了制造成本。     

基于ABAQUS的双箱自卸半挂车车架有限元分析

利用有限元软件ABAQUS6.9对新开发的某双箱自卸式半挂车车架进行建模、网格划分及应力分析,得到了该车架在多种工况下的应力分布和位移变形图,通过对计算结果进行分析,校核该车架强度满足设计使用要求,并为其结构改进与优化设计提供有效参考。     

中低速磁浮防侧滚装置轻量化设计

防侧滚装置是中低速磁浮车辆悬浮架的关键部件.首先针对悬挂中置式悬浮架的防侧滚装置进行了3种工况下的静力学分析,由计算结果发现当前防侧滚装置的片梁结构具有进一步优化的空间.通过拓扑优化计算得到改进后的防侧滚片梁结构,并对新结构进行静强度校核,校核结果表明新结构满足设计要求,且相比原结构单个防侧滚片梁减重约26.5％,一定程度上达到了轻量化设计目标.     

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...     

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。     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.     

Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking

This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern...     

奥氏体不锈钢表面双辉等离子渗锆的动力学

利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013)cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。     

气化炉三维扫描测量与数据处理

以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可.