共查询到19条相似文献,搜索用时 171 毫秒
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压力机组合机身的有限元分析与研究 总被引:3,自引:0,他引:3
在充分考虑组合机身受力及结构特点的基础上,本文建立了较为符合实际的有限元计算模型,对组合机身进行了结构有限元分析,讨论了预紧系数对机身变形和应力的影响,以及拉紧螺栓对机身的作用。 相似文献
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采用ANSYS Workbench有限元分析的方式对压力机机身的静力学性能进行分析,建立了机身结构模型,依据压力机的运行状态施加相应的载荷作用及约束.通过仿真分析可知,在机身上横梁和拉紧螺栓连接的位置存在着一定的应力集中现象,需增加连接板的厚度,机身的上横梁、立柱及底座整体的应力值及变形量较小,可对其结构进行一定的轻型化设计,从而更好地提升压力机的性能. 相似文献
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在充分考虑组合机身受力及结构特点的基础上,本文建立了较为符合实际的有限元计算模型,对组合机身进行了结构有限元分析,讨论了预紧系数对机身变形和应力的影响,以及拉紧螺栓对机身的作用。 相似文献
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大画幅等待式转镜分幅相机系统设计 总被引:1,自引:0,他引:1
采用共轴设计理论和控制离焦的方法,设计了画幅尺寸达30 mm×18 mm的大画幅等待式转镜分幅相机.该相机同时具备相对孔径大和分辨率高的特点,对底片的相对孔径为空间方向1/15,扫描方向1/35;静态目视分辨率为46 lp/mm,动态目视分辨率为35 lp/mm;总画幅数为80,摄影频率为1×104~5×105 frame/s.相机的高速转镜部件采用光纤传感器系统来产生和传输转速信号,避免了高速直流电机对转速信号的干扰,确保了测速准确度.研制的相机已应用于爆轰物理和冲击波物理实验中,并采用2×105 frame/s的拍摄频率对爆轰过程进行了试验记录,得到了高分辨率的图像.试验结果表明:设计的相机画幅尺寸大、空间分辨率高,适用于冲击、爆轰和弹体姿态等试验过程和目标的拍摄. 相似文献
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一种基于异步时序驱动和Binning技术的高帧频成像技术在帧转移CCD相机上得到成功应用。为了抑制该CCD相机成像时产生的拖尾效应,基于该相机的高帧频连续成像原理,理论上分析了图像获取过程中拖尾产生的原因,给出了一套完整的消除拖尾的数值解析算法。该算法充分考虑了图像亮度变化对拖尾形成产生的影响,并对此进行了修正,已在异步Binning CCD相机上进行了实验验证。利用相机以40 000帧每秒的帧频获取4幅连续图像进行实验,实验结果表明,该算法可有效去除每幅图像的拖尾噪声,而且消除拖尾噪声后的图像区域的灰度方差得到明显降低,异步Binning CCD相机的成像质量得以提高。上述结果表明算法适用于高帧频相机的连续成像。 相似文献
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Hyun-Jun Kim Hoon Cho Hyun-Seung Jung Tae-Soo Kwon Myung-Won Suh 《International Journal of Precision Engineering and Manufacturing》2009,10(2):79-85
The leading cab of the rolling stock receives the greatest impact when frontal crashes occur. It has a complex structure due
to the concentrated loads it must resist, and a need exists to enhance its performance while minimizing the weight of the
cab. Therefore, during the design phase, the optimal material arrangement to enhance structural capacity should be sought.
Here, topology optimization is applied to the design of a protective shell frame to enhance crash energy absorption. The design
performance during a crash is then compared with the original shell frame design. The crash analysis of this research is performed
using a finite element model consisting of an optimized/initial protective shell frame. The frame is tested in an accident
scenario (crash at 110 km/h against a movable rigid mass of 15 ton). The results of the crash analysis validate the use of
topology optimization in the conceptual design phase. 相似文献
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基于UIC标准的转向架构架强度评估 总被引:1,自引:0,他引:1
介绍了某型动车转向架焊接构架的结构特征,建立了其有限元模型;根据国际铁路联盟标准UIC615-4详细计算了构架强度分析所需的载荷条件,其中包含超常载荷、运营载荷、及附加载荷;对得到的载荷进行了组合,确定了强度分析的载荷工况,载荷工况又分为静强度评价载荷工况和疲劳强度评价载荷工况;对构架静强度进行了计算与评定,并用Goodman疲劳强度极限图对构架疲劳强度进行了评定。结果表明该转向架焊接构架能够满足标准规定的静强度及疲劳强度的要求。 相似文献
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Nasim Shatarat Samir Al-Sadder Husam Qablan 《International Journal of Mechanical Sciences》2009,51(2):166-177
The large-deflection spring behavior of an inextensible thin rhombus frame is studied in this work. The frame has a rectangular cross-section and supports two equal and opposite diagonal forces that act on its two opposite corners with a given apex angle γ. Both geometrical and material nonlinearities have been considered in the study. The beam was assumed to be made of a material having a nonlinear stress-strain relationship of the Ludwick type.A semi-analytical solution has been formulated for the relation between the large displacement at the corners of the frame and the applied forces. The deformed shapes and the nonlinear secant stiffnesses of the rhombus frame were plotted against applied loads. The frame behavior was fully investigated for different apex angles and nonlinear elastic material constants, n.In order to check the accuracy and efficiency of the proposed analytical solution, a large-displacement finite-element analysis utilizing the multi-purpose computer program ADINA was performed. Each side of the rhombus frame was divided into 10 moment-curvature beam elements. Results obtained using the analytical solution were identical to the results obtained using the software ADINA. 相似文献