地震载荷下家用救生舱的瞬态动力学分析

针对家用救生舱舱体的整体抗震性能对其结构稳定性及舱内人员安全的直接影响,利用ANSYS Workbench有限元软件对一种家用救生舱的舱体进行了瞬态动力学分析,得到了舱体位移形变云图。借助于位移形变云图分析地震过程中舱体的最大位移形变以及响应的时间点,判断舱体是否满足设计要求,找出了舱体的薄弱环节并提出了改进意见。建立了一个多目标优化设计模型,将救生舱舱体厚度、加强筋尺寸作为优化变量,将救生舱质量、最大等效应力和最大总形变量作为优化目标,利用Pro/E与AWE协同优化技术对舱体进行了优化,并对优化后的救生舱重新进行了瞬态动力学模拟分析。研究结果表明,优化后的救生舱整体强度和刚度均得以提高,对家用救生舱的设计和抗震能力的评价具有理论指导意义。     

新型矿用移动救生舱结构的分析与研究

针对现有矿用救生舱中方形舱抗冲击性能差、经济性也差;圆形舱内部空间小,且内部气瓶等装备不易放置,对国家要求的有效空间很难满足,需要舱段多等问题,提出了一种带有弧形外挂保护壳的救生舱,分析研究了这种新型救生舱的结构特点,利用ANSYS Workbench对新旧型舱的抗冲击性进行了有限元分析。研究结果表明,该救生舱的设计达到了牺牲外挂保护壳来保护舱壳的目的,且质量减轻了近40%,最大等效应力减小150.5 MPa,最大变形减小0.7341 mm,抗冲击能力、密封性能、经济性皆得到优化。     

家用安全屋舱体结构的仿真与优化

家用安全屋作为一种家庭用的避险设备,能够在紧急情况下有效地保障人身安全,因此其研究具有重要意义。首先对安全屋的舱体结构进行静载仿真分析,根据结果确定舱体壁厚、加强筋截面长度与宽度为优化参数,舱体最大变形与最大等效应力为首要优化目标,舱体质量为次要优化目标,利用UG与ANSYS Workbench的协同仿真进行多目标优化,得到一组最优解,并将优化前后的仿真结果进行对比,为家用安全屋的结构设计与优化提供理论依据。     

救生舱防护密闭门操作手柄机构热传导分析

防护密闭门操作手柄机构是矿用救生舱舱门的关键传热部件.利用ANSYS Workbench瞬态热力学方法对其进行了热传导性能分析,获得该机构的温度变化曲线和温度云图,分析该机构隔热性能不佳的原因,并对操作手柄机构进行结构改进,为救生舱热防护性能的研究提供了理论基础.     

基于DDAM方法的发射装置支架抗冲击分析

简要介绍动态设计分析方法 (DDAM),采用DDAM对发射装置支架进行抗冲击分析。通过计算得到支架的三向冲击应力和位移响应云图,总结得出支架的抗冲击特性和规律。仿真结果表明,发射装置支架的垂向抗冲击能力低于横向、纵向的抗冲击能力。所使用的仿真方法及得到的分析结果对发射装置的工程设计及性能校核具有参考价值和指导意义。     

救生舱壳体抗爆性能分析及优化设计

在对典型井下救生舱壳体形状及结构进行分析的基础上,设计出了适合我国煤矿井下实际环境需求的救生舱壳体,并利用有限元软件ANSYS对设计的救生舱壳体进行数值模拟计算及抗爆性能对比分析,最终得到最优的救生舱壳体结构,为较高抗爆性能和低成本的救生舱壳体研发提供了理论依据。     

新型矿用救生舱防护密闭门的抗冲击性分析

针对新型矿用救生舱防护密闭门在井下瓦斯爆炸时受到的冲击载荷,在分析现有舱门结构的基础上提出了一种新型救生舱防护密闭门结构,通过动力学分析软件ANSYS Autodyn模拟了井下瓦斯爆炸,得到了舱门在爆炸发生后所承受冲击载荷的分布规律,并利用有限元软件ANSYS Workbench对新型舱门整体结构和各零部件进行了静载计算与分析,得到了防护密闭门各个构件的应力在不同爆炸时间点的变化值及最大应力发生的位置,研究了新型舱门结构的抗冲击性能.分析结果表明,在爆炸过程中新型舱门各构件的最大应力均在选用材料的许用范围内,验证了新型救生舱防护密闭门结构设计满足矿用救生舱的使用要素,同时也为救生舱的进一步研发提供了一定的参考依据.     

城市紧急避难装置的跌落冲击分析

针对发生灾难时高层建筑物内逃生人员的安全避难问题,对城市紧急避难装置进行了结构设计及抗跌落冲击研究,提出了新型城市紧急避难装置结构模型。模型舱体结构采用了分段式设计,根据布置需求合理设置舱体的段数。利用ANSYS/LS-DYNA软件的跌落测试程序模块DTM对舱体进行了跌落分析,模拟了舱体从高度5 m处直接跌落及在舱体的底部添加缓冲支座后直接跌落,进行了跌落冲击分析。研究结果表明:舱体添加缓冲支座后在跌落过程中最大应力为433 MPa,相比于直接跌落冲击应力降低明显,缓冲支座的变形吸能消耗了部分冲击能量减轻了地面对舱体的直接冲击;本文研究可对城市紧急避难装置的设计和制造提供理论指导和技术支持。     

机载电子吊舱舱体设计

飞机的外挂载吊舱的飞行环境复杂而恶劣,因此吊舱舱体作为各种载荷的载体是个设计难点,其设计内容主要包含气动设计、载荷计算、结构设计、强度设计与力学试验验证。文中通过某电子吊舱舱体的设计,介绍了电子吊舱舱体设计的完整流程,对载荷计算与结构设计进行了重点分析。该设计和研究思路可作为其他类似产品设计的参考。     

一种家用可折叠高楼逃生装置的创新设计与应用

设计了一种新型家用可折叠高楼逃生装置,该装置为纯机械操控,无须电力,可同时搭载多人,逃生效率高,闲置时可折叠存放,节省空间,同时具有操作简捷、可靠性高、质量轻便等特点。该装置可作为家庭备用高楼逃生设备,在高楼火灾等紧急情况发生时,被困人员可利用该装置实现快速自救逃生。     

矿用救生舱的初步研究

在矿井发生事故后,救生舱可以为无法及时撤离的矿工提供一个安全的密闭空间,这对于完善煤矿和其他矿山安全具有示范作用.简述了救生舱的分类,并对救生舱的系统组成进行了详细介绍,为矿用救生舱的研究提供参考.     

高温热泵用螺杆压缩机电机流场的数值研究

为研究半封闭双螺杆压缩机应用于高温热泵时电机内部的温度分布状况,基于电机结构建立了电机内部制冷剂流道模型,通过CFD模拟了在高蒸发温度时电机内部的温度场与制冷剂R134a速度场。研究结果表明:当蒸发温度升高时,采用进气冷却电机效果减弱,电机内部温度升高,在制冷剂流速较小的区域出现超过100℃的高温点。该研究提供了高进气温度时电机内部温度分布情况,为高温热泵用螺杆压缩机的电机冷却方案提供了思路,同时为压缩机优化设计提供了依据。     

An isothermal temperature source with a large surface area using the metal-etched microwick-inserted vapor chamber heat spreader

For use of the thermal cycle of the biochemical fluid sample, the isothermal temperature source with a large surface area was designed, fabricated and its thermal characterization was experimentally evaluated. The comprehensive overview of the technology trend on the temperature control devices was detailed. The large surface area isothermal temperature source was realized by using the vapor chamber heat spreader. The cost-effectiveness and simple manufacturing process were achieved by using the metal-etched wick structure. The temperature distribution was quantitatively investigated by using IR temperature imaging system at equivalent temperatures to the PCR thermal cycle. The standard deviation was measured to be within 0.7°C for each temperature cycle. This concludes that the presented isothermal temperature source enables no temperature gradient inside bio-sample fluid. Furthormore it can be applied to the cooling of the electronic devices due to its slimness and low thermal spreading resistance.     

Environmental chamber for in situ dynamic control of temperature and relative humidity during x-ray scattering

We have designed, constructed, and evaluated an environmental chamber that has in situ dynamic control of temperature (25 to 90?°C) and relative humidity (0% to 95%). The compact specimen chamber is designed for x-ray scattering in transmission with an escape angle of 2θ = ±30°. The specimen chamber is compatible with a completely evacuated system such as the Rigaku PSAXS system, in which the specimen chamber is placed inside a larger evacuated chamber (flight path). It is also compatible with x-ray systems consisting of evacuated flight tubes separated by small air gaps for sample placement. When attached to a linear motor (vertical displacement), the environmental chamber can access multiple sample positions. The temperature and relative humidity inside the specimen chamber are controlled by passing a mixture of dry and saturated gas through the chamber and by heating the chamber walls. Alternatively, the chamber can be used to control the gaseous environment without humidity. To illustrate the value of this apparatus, we have probed morphology transformations in Nafion(?) membranes and a polymerized ionic liquid as a function of relative humidity in nitrogen.     

Effect of heat treatment on the hydrogen delayed fracture of high strength spring steel

The purpose of this study is to investigate the effect of the changes in the tempering temperature on the hydrogen-delayed fracture resistance of high strength spring steel. The specimens with various microstructures are produced by differentiating the tempering temperature range, their mechanical characteristics are evaluated, and an impact test is carried out. The correlation with the change in mechanical properties is studied through the analysis of the microstructures with a scanning electron microscope. Hydrogen is forcefully injected inside the notched specimen electrochemically, and the hydrogen-delayed fracture resistance is evaluated using a constant loading test. The fractography of the fractured specimen is observed, and through a thermal desorption spectrometer analysis, the main trapping site of the diffusible hydrogen is investigated. The diffusible hydrogen in high strength spring steel is primarily trapped in dislocation, and the hydrogen-delayed fracture resistance increased depending on the increase in the tempering temperature.     

不同工艺参数与超声振动作用下成形制件的盐雾老化性能

为了对注塑成形制件老化因素进行深入分析,设计制造了带有超声辅助振动系统的注塑模具来成形底部带有标准拉伸试样的矩形壳体制件。选用等规聚丙烯材料进行了不同工艺参数和超声振动作用下的成形试验,并对试验获得的制件进行了中性盐雾老化试验。同时借助X射线衍射、傅里叶变换红外光谱分析、扫描电子显微镜观测及拉伸试验等方法,研究了熔体温度、模具温度、保压压力及超声功率变化对制件内部凝聚态结构的形成与其抗老化性能的影响。研究结果表明,升高熔体温度会使制件的抗盐雾老化性能下降,而提高模具温度和保压压力则可使制件的抗盐雾老化性能提升;增大超声功率虽可使制件内部的结晶度增加,但超声功率超过200 W时,制件的拉伸强度却大幅下降,可见过高的超声功率并不利于制件内部形成具有最佳抗老化性能的凝聚态结构。     

低散热压燃点火天然气发动机的设计与试验

为实现单一燃料天然气的压燃着火，针对天然气自燃温度高的特点，设计了具有低散热结构的分隔式燃烧宣，同时设置了进气管空气加热装置和分隔室内陶瓷电热塞加热装置。实验研究了分隔宣通道尺寸、进气管空气加热温度、燃烧室陶瓷隔热涂层对天然气压燃着火过程的相关影响。     

Environmental chamber for an atomic force microscope

A commercial atomic force microscope (AFM), originally designed for operation in ambient conditions, was placed inside a compact aluminum chamber, which can be pumped down to high vacuum levels or filled with a desired gaseous atmosphere, including humidity, up to normal pressure. The design of this environmental AFM is such that minimal intrusion is made to the original setup, which can be restored easily. The performance inside the environmental chamber is similar to the original version.