共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
核电站发生失水事故后会产生大量氢气,严重威胁安全壳的完整性。日本福岛事故发生后,公众及国家核安全局对核电站安全水平的要求也逐渐提高。严重事故下安全壳内氢气浓度监测是评估氢气对安全壳威胁程度的一种重要手段。本文分析了核电站严重事故下的氢气测量技术,并介绍当前已应用于第三代核电站的严重事故下氢浓度监测系统的情况。 相似文献
3.
通过对某大型压水堆核电厂钢制安全壳顶封头特点及工程难点的分析,利用合适的现场组装工艺能够使钢制安全壳顶封头的组装质量得到良好的控制,满足了钢制安全壳的设计功能。 相似文献
4.
重点阐述了核电站安全壳在发生失水事故和严重放射性物质向环境释放情况下,其性能是否能够达到设计与验收标准,介绍并分析了安全壳性能试验的目的、内容、原理与方法及其验收准则,对进行性能试验起到相应的技术指导作用,最终确保核电站安全商运。 相似文献
5.
6.
7.
8.
9.
核电站安全壳是重要的安全防御边界,确保取样管线穿过安全壳时的结构完整性及安全性十分重要。为了确保安全壳的气密性和完整性,会在安全壳机械贯穿件中设置贯穿件膨胀节。但是,安全壳机械贯穿件上设置的膨胀节会对取样管线的应力计算产生影响;而不同类型的机械贯穿件,其上面设置的膨胀节连接形式不同,因此,对管道应力计算时的影响也不相同。介绍了RCC-M规范对取样管线与安全壳机械贯穿件膨胀节焊接时的应力分析和评价方法,重点研究A型机械贯穿件上设置的膨胀节对取样管线应力分析的影响,并给出了考虑贯穿件膨胀节对管道应力计算影响后导致管线不能满足RCC-M时的优化方案。该研究对核电站设计人员有一定的参考价值。 相似文献
10.
11.
In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
12.
13.
通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
14.
15.
设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
16.
一种涡旋压缩机径向随变机构的设计 总被引:1,自引:0,他引:1
详细介绍了运用随变原理设计的一种新型径向密封机构的结构特点,工作原理及主要参数的确定方法,该机构可补偿由于涡旋体加工精度不高而造成的功率损失,适用于涡旋压缩机的批量生产。 相似文献
17.
本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献
18.
V. P. Dragunov E. G. Kostsov 《Optoelectronics, Instrumentation and Data Processing》2009,45(3):234-242
Specific features of operation of one- and two-capacitor microelectromechanical converters (MEMC) of energy of mechanical microscopic vibrations into electric energy with a modulated electrode-gap magnitude and with allowance for the mutual influence of electrical and elastic forces are analyzed, and the characteristics of these two devices are compared. The main factors restricting the increase in MEMC power are demonstrated to be the effects of “collapsing” and the condition of conservation of positive rigidity of the system. Expressions for estimating the limiting MEMC parameters are derived. The possibility of electrical energy generation in the presence of “real“ sources of wide-spectrum microscopic vibrations is considered. 相似文献
19.
针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献