共查询到18条相似文献,搜索用时 125 毫秒
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在化工生产中,由于对特定工作环境的限制,需要考虑高温、高压、腐蚀、污染等情况,研究其可靠性的意义也逐步凸显出来。目前,可以利用有限分析软件ANSYS的概率分析功能,对球形压力进行可靠性分析,并通过计算得来的数据对参数敏感性进行分析和评价,分析结果为以可靠性为基础的压力容器标准提供了科学的依据和有益的参考。 相似文献
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可靠度是衡量结构物固有可靠性水平的重要指标之一,正确选取可靠性分析方法以及可靠度计算方法是开展舰艇用复合材料结构可靠性设计工作的基础和保障。舰艇用复合材料结构工作环境复杂,加之复合材料本身具有非均匀、各向异性等性质,力学性能比传统金属材料复杂得多,离散度也大,导致结构可靠性设计问题相对突出。对此,分析了舰艇用复合材料结构强度特性及其分布规律,提出基于应力-强度干涉模型进行舰用复合材料结构可靠性分析,采用B基准设计许用值的安全系数法开展可靠度计算的可靠性设计技术途径。二者联立,在求解问题能力及结果准确性等方面具有明显的可操作性和优越性,对开展舰艇用复合材料结构可靠性设计具有重要的参考意义。 相似文献
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为了及时、准确地对压力容器进行可靠性评估,将ANSYS和蒙特卡罗相结合方法引入压力容器模型的计算中。以概率论为基础,用此方法对建立的模型进行500次随机抽样分析,求出在一定置信度下的可靠度曲线;并对输出随机变量的灵敏度和抽样过程进行了分析,求得对结果影响最大的因素是屈服强度。结果表明,该模型可以有效地反映压力容器的实际情况,为其结构可靠性分析提供参考。 相似文献
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提出了一种机械加压式脱水设备中钢架结构的设计分析方法。在ANSYS软件环境下,运用shell63壳单元进行建模,对重载作用下的钢架进行强度校核和分析,并对钢架结构进行优化设计。参考分析设计标准,校核数值模拟结果,表明设计方案满足设计要求,为设计方案的可靠性提供了依据。在满足强度设计要求的条件下,优化设计为整个设计方案节省了材料,降低制造成本。该方法为设备其他部件的设计提供了参考。 相似文献
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纤维缠绕聚合物基复合材料(FWRP)压力容器在航空航天及民用领域的应用是当前研究热点。减轻结构重量对于性能和成本都具有非常重要意义。为实现FWRP压力容器结构设计和安全评定的高目标,引入可靠性理论,应用统计学原理,基于应力-强度干涉模型,以同一失效概率为标准进行FWRP压力容器结构设计,以取代现应用的传统安全系数法设计。采用无碱无捻玻璃纤维-环氧树脂材料体系,应用同一缠绕工艺制备8个压力容器。试验得到纤维强度、缠绕角、几何尺寸、爆破压力等随机变量特征值。其结构可靠性设计值(纤维缠绕壁厚)与试验结果基本吻合,并显著小于常规设计值。将各设计变量随机分布特征值与压力容器结构设计相结合,实现安全与经济的有效统一,为可靠性设计在FWRP压力容器上的应用与发展提供了依据。 相似文献
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针对往复式压缩机传动机构的疲劳失效问题,提出一种适用于机械多体随机系统的虚拟可靠性试验方法。考虑到环境载荷、尺寸误差及材料强度等因素的随机性,根据乘同余法编写随机数子程序,利用Pro/E软件和APDL语言的参数化功能实现虚拟样机的随机抽样;基于显式动力学算法,采用ANSYS/LS-DYNA程序进行动态数值仿真分析,获得虚拟试验数据;根据K-S法分析数据的分布类型,考核关键零部件各处结构的可靠性,从而找出整个系统的薄弱环节。同时,依据传统的疲劳强度理论,建立可靠性分析模型,分析传动机构的可靠性。通过两种分析方法的比较,说明了新方法的合理性,为机械多体随机系统的故障预报和最优维护提供前提准备。 相似文献
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As chemical engineers seek to improve plant safety, reliability, and financial performance, a wide range of uncertaintyladen decisions need to be made. It is widely agreed that probabilistic approaches provide a rational framework to quantify such uncertainties and can result in improved decision making and performance when compared with deterministic approaches. This article proposes a novel method for design and performance analysis of chemical engineering processes under uncertainty. The framework combines process simulation tools, response surface techniques, and numerical integration schemes applied in structural reliability problems to determine the probability of a process achieving a performance function of interest. The approach can be used to model processes in the presence or absence of performance function(s), with or without parameter interactions, at both design and operational phases. With this, process behavior can be quantified in terms of stochastic performance measures such as reliability indices and the associated most probable process design/operating conditions, providing a simple way to analyze a wide range of decisions. To validate the applicability of the proposed framework, three case study systems are considered: a plug flow reactor, a heat exchanger, and finally a pump system. In each case, performance criteria based on the original physical model and the surrogate model are set up. Reliability analysis is then carried out based on these two models and the results are assessed. The results show that the proposed framework can be successfully applied in chemical engineering analysis with additional benefits over the traditional deterministic methods. 相似文献
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密封面上的接触应力是保证密封性能的一个重要参数。通过有限元分析软件ANSYS,对卡扎里密封垫圈的结构进行优化设计,得到最优的结构尺寸。通过对优化设计的评估,考察垫圈的结构尺寸变化对垫圈密封面上接触应力分布及最大接触应力影响。对优化后的结构进行应力评定,保证垫圈结构的强度及可靠性。有助于垫圈结构设计,保证密封性能。同时可以减小密封系统结构尺寸,利于开发新型垫圈。 相似文献
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Probabilistic approach for durability design of reinforced concrete in marine environment 总被引:1,自引:0,他引:1
A probabilistic approach to durability is proposed for the design of reinforced cover of a concrete immersed in sea water. It uses a non-linear chloride diffusion model for a saturated medium, which is first exposed with its physical parameters. Parameter variability is estimated and used through the probabilistic approach to assess the probability of reaching a critical chloride concentration near the reinforcement for a given service life. Based on the concrete formulation and the cement chemical composition, the model parameters are evaluated with their associated random distribution. The corrosion risk is then estimated through the Hasofer-Lind reliability index. Currently, the methodology is available for Ordinary Portland Cement (OPC) and for saturated media. A practical application is proposed to underline the applicability of the methodology. The decrease in the reliability index with time is computed for a cover depth coming from actual design rules. The probabilistic sensitivity factors are also assessed and show the importance of some model parameters called “durability indicators”. 相似文献