The casing damage has been a big problem in oilfield production. The current detection methods mostly are used after casing damage, which is not very effective. With the rapid development of China's offshore oil i...The casing damage has been a big problem in oilfield production. The current detection methods mostly are used after casing damage, which is not very effective. With the rapid development of China's offshore oil industry, the number of offshore oil wells is becoming larger and larger. Because the cost of offshore oil well is very high, the casing damage will cause huge economic losses. What's more, it can also bring serious pollution to marine environment. So the effective methods of detecting casing damage are required badly. The accumulation of stress is the main reason for the casing damage. Magnetic anisotropy technique based on counter magnetostriction effect can detect the stress of casing in real time and help us to find out the hidden dangers in time. It is essential for us to prevent the casing damage from occurring. However, such technique is still in the development stage. Previous studies mostly got the relationship between stress and magnetic signals by physical experiment, and the study of physical mechanism in relative magnetic permeability connecting the stress and magnetic signals is rarely reported. The present paper uses the ANSYS to do the three-dimensional finite element numerical simulation to study how the relative magnetic permeability works for the oil casing model. We find that the quantitative relationship between the stress' s variation and magnetic induction intensity's variation is: Δδ =K* ΔB, K = 8.04×109, which is proved correct by physical experiment.展开更多
In this paper the single-event responses of the silicon germanium heterojunction bipolar transistors(SiGe HBTs) are investigated by TCAD simulations and laser microbeam experiment. A three-dimensional(3D) simulation m...In this paper the single-event responses of the silicon germanium heterojunction bipolar transistors(SiGe HBTs) are investigated by TCAD simulations and laser microbeam experiment. A three-dimensional(3D) simulation model is established, the single event effect(SEE) simulation is further carried out on the basis of Si Ge HBT devices, and then, together with the laser microbeam test, the charge collection behaviors are analyzed, including the single event transient(SET) induced transient terminal currents, and the sensitive area of SEE charge collection. The simulations and experimental results are discussed in detail and it is demonstrated that the nature of the current transient is controlled by the behaviors of the collector–substrate(C/S) junction and charge collection by sensitive electrodes, thereby giving out the sensitive area and electrode of SiGe HBT in SEE.展开更多
Simulation is a powerful technique in evaluating and improving the performance of complex systems.In order to improve the efficiency of simulation experiment design,analysis and evaluation,auxiliary tools are required...Simulation is a powerful technique in evaluating and improving the performance of complex systems.In order to improve the efficiency of simulation experiment design,analysis and evaluation,auxiliary tools are required.Unfortunately,existing tools are usually not meeting the requirements of simulation.Moreover,the restricted interfaces,reusability and expandability influence their efficiency to a certain extent.In this paper,an integrated software environment,HIT-SEDAES,is designed for solving these problems.A process model of simulation experiment design,analysis and evaluation is introduced to guide the development of the software environment.And several solutions are proposed to solve key problems in this development.Finally,an application is used to illustrate how the software environment works for the problems of model validation,effectiveness evaluation and performance analysis.展开更多
3篇系列文章中的前2篇分别介绍了电力市场与电力系统动态交互仿真平台(dynamicsimulation platform for power market&power system,DSPMPS)的功能设计和支撑层。利用支撑层提供的仿真应用开发接口及工具,按功能设计要求,以软件积...3篇系列文章中的前2篇分别介绍了电力市场与电力系统动态交互仿真平台(dynamicsimulation platform for power market&power system,DSPMPS)的功能设计和支撑层。利用支撑层提供的仿真应用开发接口及工具,按功能设计要求,以软件积木方式搭建反映广义阻塞、支持图形化决策试探的各种可伸缩应用。从物理系统与经济系统动态交互的典型问题中提炼出高使用频率的模型,设计仿真组件库,以提高组件的可重用性。采用功能强大的电力系统稳定性量化分析软件包FASTEST作为物理仿真引擎。利用仿真标记语言编写实验脚本,配置多角色多参与者的各种仿真应用。通过典型的仿真实验过程说明了该平台的设计特点。展开更多
由3篇论文组成的系列文章介绍了电力市场与电力系统动态交互仿真平台(dynamicsimulation platform for power market&power system,DSPMPS)。在第1篇关于功能设计的基础上,文中建立了仿真应用开发接口,以支持在服务器端及客户端扩...由3篇论文组成的系列文章介绍了电力市场与电力系统动态交互仿真平台(dynamicsimulation platform for power market&power system,DSPMPS)。在第1篇关于功能设计的基础上,文中建立了仿真应用开发接口,以支持在服务器端及客户端扩展各种内核组件。利用IT技术,以可视化、网络化的实验形式来建立多角色博弈;以事件驱动和面向服务机制模拟多尺度时间、空间、目标的复杂动态交互;以标准化、积木化的形式实现高效灵活的用户定制及扩展开发;按国际标准创建开放且高效的多核运算架构。下一篇将介绍以软件积木方式,在支撑层上搭建反映广义阻塞、支持图形化决策试探的各种仿真应用。展开更多
基金supported by the National Natural Science Foundation of China(No.41174157)
文摘The casing damage has been a big problem in oilfield production. The current detection methods mostly are used after casing damage, which is not very effective. With the rapid development of China's offshore oil industry, the number of offshore oil wells is becoming larger and larger. Because the cost of offshore oil well is very high, the casing damage will cause huge economic losses. What's more, it can also bring serious pollution to marine environment. So the effective methods of detecting casing damage are required badly. The accumulation of stress is the main reason for the casing damage. Magnetic anisotropy technique based on counter magnetostriction effect can detect the stress of casing in real time and help us to find out the hidden dangers in time. It is essential for us to prevent the casing damage from occurring. However, such technique is still in the development stage. Previous studies mostly got the relationship between stress and magnetic signals by physical experiment, and the study of physical mechanism in relative magnetic permeability connecting the stress and magnetic signals is rarely reported. The present paper uses the ANSYS to do the three-dimensional finite element numerical simulation to study how the relative magnetic permeability works for the oil casing model. We find that the quantitative relationship between the stress' s variation and magnetic induction intensity's variation is: Δδ =K* ΔB, K = 8.04×109, which is proved correct by physical experiment.
基金supported by the National Natural Science Foundation of China(Grant No.61274106)
文摘In this paper the single-event responses of the silicon germanium heterojunction bipolar transistors(SiGe HBTs) are investigated by TCAD simulations and laser microbeam experiment. A three-dimensional(3D) simulation model is established, the single event effect(SEE) simulation is further carried out on the basis of Si Ge HBT devices, and then, together with the laser microbeam test, the charge collection behaviors are analyzed, including the single event transient(SET) induced transient terminal currents, and the sensitive area of SEE charge collection. The simulations and experimental results are discussed in detail and it is demonstrated that the nature of the current transient is controlled by the behaviors of the collector–substrate(C/S) junction and charge collection by sensitive electrodes, thereby giving out the sensitive area and electrode of SiGe HBT in SEE.
基金supported by the National Natural Science Foundation of China(61403097)the Fundamental Research Funds for the Central Universities(HIT.NSRIF.2015035).
文摘Simulation is a powerful technique in evaluating and improving the performance of complex systems.In order to improve the efficiency of simulation experiment design,analysis and evaluation,auxiliary tools are required.Unfortunately,existing tools are usually not meeting the requirements of simulation.Moreover,the restricted interfaces,reusability and expandability influence their efficiency to a certain extent.In this paper,an integrated software environment,HIT-SEDAES,is designed for solving these problems.A process model of simulation experiment design,analysis and evaluation is introduced to guide the development of the software environment.And several solutions are proposed to solve key problems in this development.Finally,an application is used to illustrate how the software environment works for the problems of model validation,effectiveness evaluation and performance analysis.
文摘3篇系列文章中的前2篇分别介绍了电力市场与电力系统动态交互仿真平台(dynamicsimulation platform for power market&power system,DSPMPS)的功能设计和支撑层。利用支撑层提供的仿真应用开发接口及工具,按功能设计要求,以软件积木方式搭建反映广义阻塞、支持图形化决策试探的各种可伸缩应用。从物理系统与经济系统动态交互的典型问题中提炼出高使用频率的模型,设计仿真组件库,以提高组件的可重用性。采用功能强大的电力系统稳定性量化分析软件包FASTEST作为物理仿真引擎。利用仿真标记语言编写实验脚本,配置多角色多参与者的各种仿真应用。通过典型的仿真实验过程说明了该平台的设计特点。
文摘由3篇论文组成的系列文章介绍了电力市场与电力系统动态交互仿真平台(dynamicsimulation platform for power market&power system,DSPMPS)。在第1篇关于功能设计的基础上,文中建立了仿真应用开发接口,以支持在服务器端及客户端扩展各种内核组件。利用IT技术,以可视化、网络化的实验形式来建立多角色博弈;以事件驱动和面向服务机制模拟多尺度时间、空间、目标的复杂动态交互;以标准化、积木化的形式实现高效灵活的用户定制及扩展开发;按国际标准创建开放且高效的多核运算架构。下一篇将介绍以软件积木方式,在支撑层上搭建反映广义阻塞、支持图形化决策试探的各种仿真应用。
