针对坩埚在进行检漏时,大多为水检法、皂泡法等人工检漏的方法,为解决效率低,时间久等问题,提出一种基于PLC坩埚氦质谱检漏装置平台。通过对检漏平台进行总体方案设计,确定工作流程,重点解决坩埚内部真空、上位机和氦质谱仪通讯、上位机...针对坩埚在进行检漏时,大多为水检法、皂泡法等人工检漏的方法,为解决效率低,时间久等问题,提出一种基于PLC坩埚氦质谱检漏装置平台。通过对检漏平台进行总体方案设计,确定工作流程,重点解决坩埚内部真空、上位机和氦质谱仪通讯、上位机和PLC通讯等问题。对系统硬件方面,进行了电气控制原理设计与选型、PLC型号选择、真空管道的设计、接线图设计;对控制系统软件方面,通过STEP 7-Microwin SMART,对作为主控器的PLC进行了控制程序的编写,再通过Visual Studio 2015进行人机交互界面的设计,以及通过与SQL2012数据库连接,将测得的数据放入数据库,最后通过上位机编译实现人机交互,实验平台开机运行调试。最终实验结果显示,整个平台实现了对坩埚的密封、检漏、检漏数据的存储,其中检漏同一坩埚10次检漏率值标准偏差S≤2.84,满足工业生产要求。展开更多
Coronary stents are metal coils or mesh tubes delivered to blocked vessels through catheters, which are expanded by balloons to reopen and scaffold target vessels. Recently,special drugs are carried by stents (drug-el...Coronary stents are metal coils or mesh tubes delivered to blocked vessels through catheters, which are expanded by balloons to reopen and scaffold target vessels. Recently,special drugs are carried by stents (drug-eluting stents) to further reduce in-stent restenosis rate after stenting procedure. However,continual study on biomechanical characteristics of stents is necessary for better interactions between stents and tissue, or to provide a more suitable drug loading platform for drug-eluting stents. The purpose of this paper is to show how finite element methods can be used to study cell area and strut distribution changes of bent coronary stents. A same bending deformation was applied to two commercial coronary stent models by a rigid curved vessel. Results show that the stent design influenced the changes of cell area and strut distribution under bending situation. The stent with links had more cell area changes at outer curvature, and the stent with peak-peak (><) strut design could have strut contact and overlapping at inner curvature. In conclusion, this finite element method can be used to study and compare cell area and strut distribution changes of bent stents,and to provide a convenient tool for designers in testing and improving biomechanical characteristics of new stents.展开更多
文摘针对坩埚在进行检漏时,大多为水检法、皂泡法等人工检漏的方法,为解决效率低,时间久等问题,提出一种基于PLC坩埚氦质谱检漏装置平台。通过对检漏平台进行总体方案设计,确定工作流程,重点解决坩埚内部真空、上位机和氦质谱仪通讯、上位机和PLC通讯等问题。对系统硬件方面,进行了电气控制原理设计与选型、PLC型号选择、真空管道的设计、接线图设计;对控制系统软件方面,通过STEP 7-Microwin SMART,对作为主控器的PLC进行了控制程序的编写,再通过Visual Studio 2015进行人机交互界面的设计,以及通过与SQL2012数据库连接,将测得的数据放入数据库,最后通过上位机编译实现人机交互,实验平台开机运行调试。最终实验结果显示,整个平台实现了对坩埚的密封、检漏、检漏数据的存储,其中检漏同一坩埚10次检漏率值标准偏差S≤2.84,满足工业生产要求。
文摘Coronary stents are metal coils or mesh tubes delivered to blocked vessels through catheters, which are expanded by balloons to reopen and scaffold target vessels. Recently,special drugs are carried by stents (drug-eluting stents) to further reduce in-stent restenosis rate after stenting procedure. However,continual study on biomechanical characteristics of stents is necessary for better interactions between stents and tissue, or to provide a more suitable drug loading platform for drug-eluting stents. The purpose of this paper is to show how finite element methods can be used to study cell area and strut distribution changes of bent coronary stents. A same bending deformation was applied to two commercial coronary stent models by a rigid curved vessel. Results show that the stent design influenced the changes of cell area and strut distribution under bending situation. The stent with links had more cell area changes at outer curvature, and the stent with peak-peak (><) strut design could have strut contact and overlapping at inner curvature. In conclusion, this finite element method can be used to study and compare cell area and strut distribution changes of bent stents,and to provide a convenient tool for designers in testing and improving biomechanical characteristics of new stents.
