Research on static characteristic of double redundance double nozzle flapper valve based on AMESim

The feedback spring rod of the armature assembly is cancelled in the double redundance double nozzle flapper valve(DRDNFV),and the difficulty of valve core displacement control is increased.Therefore,this paper intends to study the static characteristic of DRDNFV through the AMESet and AMESim simulation.It is explored under the circumstance of the fixed orifices being clogged and experimentally verified on the test bench.The results show that the pressure gain increases and the flow gain decreases with the increasing clogged degree of the fixed orifices on both sides.The zero bias increases synchronously with the increasing clogged degree of the unilateral fixed orifice.The experimental results are basically consistent with the theoretical curves and the theoretical correctness of the simulation model is effectively verified.The results can provide the theoretical reference for design,debugging,maintenance and fault diagnosis of DRDNFV.

预制不同位置裂隙岩体在单轴加载过程的PFC2D数值模拟

在岩土工程领域中,岩体的稳定性关系到整个结构工程的安全。通过离散元模拟软件PFC2D模拟含裂隙岩体,建立一个包含不同位置,直径50cm,高100cm圆柱体试件二维模型,裂纹斜长l=30mm,裂纹尺寸为30mm×2mm,分别在模型上部、中间、下部位置设置预制裂隙,分析单轴加载情况下岩体的变形、破裂规律。结果表明:单轴加载时,从岩体内部破裂情况看,破坏形式主要是拉伸破坏,细观上看是由于岩体颗粒速度发生相对错动,从而发生拉伸破坏。岩体的破裂区集中在裂隙的尖端点部位,通过分析岩体的颗粒力链分布,从微观层面发现岩体破坏的主要形式及破裂原因。

专科中医护理门诊服务模式建设的思考与实践

本文探讨了专科中医护理门诊服务模式的建设,总结中医护理门诊高级实践服务特点。通过确立中医护理门诊护士的角色作用,明确中医护理治疗专科护士主导下的护理实践活动的特点,形成专科医护一体化服务模式,加强中医护理门诊服务质量管理,做好出诊护士核心能力培训考核等,不断丰富中医护理特色的优质护理服务内涵,加快中医护理服务体系的建立,促进护理专科化进程,对中医护理专科的长期可持续发展有着积极的推动作用,值得广大护理管理者和具备专科工作经验的临床护理人员去开拓和实践。