简介:针对传统盘柜式双机模式在数据存储量小的信息系统中,存在成本高、存储空间浪费的问题,提出了用纯软件方式替代传统盘柜方式实现双机热备的方案,可以较低廉的成本实现双机无人值守的正常切换,并详细介绍了系统设置和软件使用的技术细节。
简介:Basedontheprincipleofimpedancemismatching,theperformanceofrigidvibrationisolationmassinimpedingvibrationwavepropagationwasdiscussedfromtheperspectiveofwaveapproach.BasedonFEM,theinfluenceofitsweightaswellasthecross-sectionshapeparametersontheisolationperformanceofrigidvibrationisolationmasswasstudiedthroughnumericalsimulation.Theresultsshowthatrigidvibrationisolationmasscaneffectivelyimpedethepropagationofthemediumandhighfrequencyvibrationwaves,andtheheavierthevibrationisolationmass,thebettertheisolationperformance.Forlowfrequencywaves,thevibrationisolationeffectisnotsoobvious;forarectangularvibrationisolationmass,theisolationperformancecouldbeeffectivelyimprovedbyincreasingthecross-sectionheightandreducingthecross-sectionwidth.Ausefulreferencewasprovidedfortheapplicationofrigidvibrationisolationmassestothevibrationisolationandnoisereductionofshipstructure.
简介:介绍了一种基于Spalding公式拟合的脊状表面减阻测试方法,相比于用天平等测力设备测试的方法,其优点在于简便实用,从应用实例来看,准确性也是令人满意的.由于该方法依靠的数据基础是壁面边界层内层速度分布,因此,速度分布测量的准确程度是影响该方法测试结果准确与否的决定因素.