Computer numerical control(CNC)system is the base of modern digital and intelligent manufacturing technolo- gy.And opened its architecture and constituted based on PC and Windows operating system(OS)is the main trend ...Computer numerical control(CNC)system is the base of modern digital and intelligent manufacturing technolo- gy.And opened its architecture and constituted based on PC and Windows operating system(OS)is the main trend of CNC sys- tem.However,even if the highest system priority is used in user mode,real-time capability of Windows(2000,NT,XP)for applications is not guaranteed.By using a device driver,which is running in kernel mode,the real time performance of Windows can be enhanced greatly.The acknowledgment performance of Windows to peripheral interrupts was evaluated.Harmonized with an intelligent real-time serial communication bus(RTSB),strict real-time performance can be achieved in Windows platform. An opened architecture software CNC system which is hardware independence is proposed based on PC and RTSB.A numerical control real time kernel(NCRTK),which is implemented as a device driver on Windows,is used to perform the NC tasks.Tasks are divided into real-time and non real-time.Real-time task is running in kernel mode and non real-time task is running in user mode.Data are exchanged between kernel and user mode by DMA and Windows Messages.展开更多
工欲善其事。必先利其器。面对着越来越多的移动用户。桌面管理员们常常会通过各种组策略设置来满足他们的工作需求。但遗憾的是。仅通过微软内置的组策略还不能满足他们更细化的应用需求。他们更需要一种能够自动适应用户环境变化的弹...工欲善其事。必先利其器。面对着越来越多的移动用户。桌面管理员们常常会通过各种组策略设置来满足他们的工作需求。但遗憾的是。仅通过微软内置的组策略还不能满足他们更细化的应用需求。他们更需要一种能够自动适应用户环境变化的弹性策略。在本文中，将介绍一个小巧实用的工具——Ouest Group Policy Extensions for Desktops。通过它来扩展一些组策略的设置。展开更多
The speed and quality of the image fusion always restrain each other.The real-time image fusion is one of the problems which needs to be studied and solved urgently.The windowing processing technology for the image fu...The speed and quality of the image fusion always restrain each other.The real-time image fusion is one of the problems which needs to be studied and solved urgently.The windowing processing technology for the image fusion proposed in this paper can solve this problem in a certain extent.The windowing rules were put forward and the applicable scope for the windowing fusion and the calculation method for the maximum windowing area were determined.And,the results of the windowing fusion were analyzed,verified and compared to confirm the feasibility of this technology.展开更多
对于正在研制的用于弹性轴类零件试验的30000NM扭矩液压伺服摆振试验机,其传动系统的数学建模较为复杂,且被试验零件特性不确定且变化范围较大,致使系统精确的数学模型无法建立。为了保证实际设计过程中控制算法的有效性,采用模糊PID控...对于正在研制的用于弹性轴类零件试验的30000NM扭矩液压伺服摆振试验机,其传动系统的数学建模较为复杂,且被试验零件特性不确定且变化范围较大,致使系统精确的数学模型无法建立。为了保证实际设计过程中控制算法的有效性,采用模糊PID控制算法。利用Simulink/Real-Time Windows Target工具箱,直接在试验机物理硬件上建立了基于现场仪器的实时数字仿真模型,方便而快速得到试验结果。实现了对液压伺服摆振试验机的快速半实物仿真,并快速验证了算法的有效性,提高控制系统的设计效率。展开更多
基金Supported by the National Natural Science Foundation of China(No.50445004).
文摘Computer numerical control(CNC)system is the base of modern digital and intelligent manufacturing technolo- gy.And opened its architecture and constituted based on PC and Windows operating system(OS)is the main trend of CNC sys- tem.However,even if the highest system priority is used in user mode,real-time capability of Windows(2000,NT,XP)for applications is not guaranteed.By using a device driver,which is running in kernel mode,the real time performance of Windows can be enhanced greatly.The acknowledgment performance of Windows to peripheral interrupts was evaluated.Harmonized with an intelligent real-time serial communication bus(RTSB),strict real-time performance can be achieved in Windows platform. An opened architecture software CNC system which is hardware independence is proposed based on PC and RTSB.A numerical control real time kernel(NCRTK),which is implemented as a device driver on Windows,is used to perform the NC tasks.Tasks are divided into real-time and non real-time.Real-time task is running in kernel mode and non real-time task is running in user mode.Data are exchanged between kernel and user mode by DMA and Windows Messages.
文摘工欲善其事。必先利其器。面对着越来越多的移动用户。桌面管理员们常常会通过各种组策略设置来满足他们的工作需求。但遗憾的是。仅通过微软内置的组策略还不能满足他们更细化的应用需求。他们更需要一种能够自动适应用户环境变化的弹性策略。在本文中，将介绍一个小巧实用的工具——Ouest Group Policy Extensions for Desktops。通过它来扩展一些组策略的设置。
基金Supported by National Science Fund for Distinguished Young Scholars(60625302)National Key Fundamental Research Project of China(2002CB3122000)National High Technology Research and Development Program of China(863 Program)(20060104Z1081)
文摘The speed and quality of the image fusion always restrain each other.The real-time image fusion is one of the problems which needs to be studied and solved urgently.The windowing processing technology for the image fusion proposed in this paper can solve this problem in a certain extent.The windowing rules were put forward and the applicable scope for the windowing fusion and the calculation method for the maximum windowing area were determined.And,the results of the windowing fusion were analyzed,verified and compared to confirm the feasibility of this technology.
文摘对于正在研制的用于弹性轴类零件试验的30000NM扭矩液压伺服摆振试验机,其传动系统的数学建模较为复杂,且被试验零件特性不确定且变化范围较大,致使系统精确的数学模型无法建立。为了保证实际设计过程中控制算法的有效性,采用模糊PID控制算法。利用Simulink/Real-Time Windows Target工具箱,直接在试验机物理硬件上建立了基于现场仪器的实时数字仿真模型,方便而快速得到试验结果。实现了对液压伺服摆振试验机的快速半实物仿真,并快速验证了算法的有效性,提高控制系统的设计效率。
