压力容器失效概率的计算方法

本文从质检部门统计的万台事故率入手,通过横向比较各台容器的设计、制造、安装、使用、维修改造等各个环节质量,然后通过统计,建模以及经验公式等方式,量化每个指标,设计出压力容器失效概率的计算公式。有了失效概率这个参数,就可以对压力容器的快速检验,安全分级,风险预测提供支持。     

基于云隶属度支持向量机的舰船购置费时间序列预测

模糊支持向量机降低了传统支持向量机对异常点的敏感度,但其模糊隶属度函数对样本点的分类缺乏模糊性,影响舰船购置费预测的精度。因此,利用云理论能够科学表达模糊性的特点,设计了一种面向异常点模糊分类的云隶属度发生器;在支持向量机中引入这种云隶属度发生器,提出了一种基于云隶属度的支持向量机算法;构建了基于云隶属度支持向量机的舰船购置费时间序列预测模型。实验证明：该算法模糊地降低了模型对异常点的敏感度,并自适应地对支持向量约束水平进行寻优,提高了舰船购置费预测的精度。     

液化器异形偏心锥有限元应力分析

以客户提供的液化器设计结构草案和设计载荷为基础进行分析,对液化器下部带夹套的异形偏心锥体结构进行强度核算.首先利用三维建模软件SOLIDWORK建立实体模型,然后将模型导入有限元分析计算软件ANSYS中定义单元、划分网格和施加载荷,再进行有限元内压静载荷分析和外压屈曲稳定性分析,最后依据国家标准JB4732-1995(2005确认)中的相关评定规则对分析结果进行评定.对结构草案中弯曲应力超过标准要求的不连续结构区域进行结构改造,降低弯曲应力,使液化器下部锥体的最终设计方案能够满足国家标准的要求和客户的要求.     

小子样状态下舰船特种阀门可靠性评估方法

针对舰船特种阀门 可靠性评估比较困难的问题,提出了将Bayes理论和相似性理论相结合的评估新方法.充分利用历史先验信息,并结合现场数据从而获得后验分布;利用相似性理论确定新旧型号阀门的相似度精确值.综合历史后验和后验分布,得到产品可靠性的融合后验.结合实例,对比分析了经典评估方法、传统Bayes方法和新方法所得到的新型号特种阀门可靠性的置信下限,验证了所提出方法的科学性和实用性.研究了新型号阀门的两参数威布尔寿命分布特性,给出了可靠度函数和可靠度寿命表达式,其计算结果可作为产品的接收判据,并在应用中提高了舰船特种阀门可靠性的评估精度,同时可以显著地减少现场试验样本数量.     

液化气储罐监造检验工艺探讨

结合液化石油气储罐的设计结果,结合相关技术标准对其制造工艺流程、监造要点与检验等问题进行了分析与探讨,对于相关压力容器的制造、监造与检验工作具有一定的借鉴价值.     

应用数字散斑法测量受载压力容器壁形变的研究

应用数字散斑对受载压力容器壁的相对微小形变进行了试验研究。研究中采用气压加载,利用激光散斑场作为待测表面的信息载体,动态在线测量压力容器的微小形变。进一步对形变影响的定量研究将为预知形变的尺寸及位置,以及结构的安全和检测提供帮助,可以为结构无损检测提供依据。     

Determination of the pressurising period for stored cryogenic fluids

It is a normal operating condition for a lot of cryogenic storage vessels that no boil-off gas is vented over long periods, which leads to a simultaneous pressure increase of the stored fluid. One main reason therefore is to avoid product losses during transport or between withdrawals. At transport conditions the mixing of the fluid can be assumed to be ideally, which results in a maximum reachable pressurising period. At stationary conditions the pressurising period is expected to be shorter, because a stratification is rising up, so that the heat capacity of the stored fluid cannot be used completely.In a thermodynamic view, an isochore change of state takes place and the heat flux into the vessel rises the internal energy of the fluid. For the representation of the isochore change of state a new developed Δu/v-v-diagram with the 1 × 10⁵ Pa reference as a basis line is introduced. The basis line is linear for the filling rate and functionally connected with the specific volume.For the fluids He and H₂ e.g., Δu/v-v-diagrams are pointed out, using the u- and v-values on the saturation lines for the two phase region and those of some isobar lines for the region above the critical pressure.     

The Analysis of the Line Pattern of Nonlinear Winding Filament on FRP Composite Air Vessel Resisting High Pressure

The FW process is a prefect method of manufacturing FRP composite air vessel resisting high pressure and aerial press vessel.In this paper FW pattern of FRP composite air vessel resisting high pressure was analyzed in a nutshell.The stability of FW patterns on end head is very sensitive to changing of pattern parameter.Consequently,its FW pattern was based on geodesic track.The FW angles and on equators depend on the dimension of end part and the condition of geodesic FW.Generally speaking, the polar holes of rocket engine shell are disproportional.Therefore,the FW angles of the shell column are changeable.The feasi- bility of nongeodesic FW of the shell column was discussed in this paper.Furthermore,it expounded the indispensable condition be- tween the length of shell column and the FW friction coefficient.At the same time,the general mathematic models of the movement control of nongeodesic FW were deduced.     

某厂锗煤反射炉收尘系统问题探讨

文章介绍了某厂改造后的锗煤反射炉收尘系统，并对该收尘系统中存在的问题进行了分析和探讨。     

气液两用槽车设计制造中应着重考虑的一些问题

根据某型高压低温充氧车的研制实践,对氧、氮气液两用槽车的贮槽与贮气瓶的配置、低温液体贮槽蒸发率的要求及控制、低温液体泵的安装及工作条件的保障以及槽车安全性设计等方面应重点考虑的问题进行了探讨。