A 2-D non-uniform sediment mat hmatical model in the boundary-fitting orthogonal coordinate system was develop ed in this paper. The governing equations, the numerical scheme, the boundary con ditions, the movable bou...A 2-D non-uniform sediment mat hmatical model in the boundary-fitting orthogonal coordinate system was develop ed in this paper. The governing equations, the numerical scheme, the boundary con ditions, the movable boundary technique and the numerical solutions were present ed. The model was verified by the data of the reach 25km upstream the Jialingjia ng estuary and the 44km long main stream of the Chongqing reach of the Yangtze r iver. The calculated results show that, the water elevation, the velocity distri bution and the river bed deformation are in agreement with the measured data.展开更多
对关节臂式坐标测量机数据采集系统的几个关键点进行了分析设计,其中包括数据同步锁存、对径读数、坐标实时显示.通过可编程逻辑器件(CPLD)与单片机的结合,完成了光栅信号的滤波、4细分、辨向及可逆计数等功能.实验证明,该设计能够准确...对关节臂式坐标测量机数据采集系统的几个关键点进行了分析设计,其中包括数据同步锁存、对径读数、坐标实时显示.通过可编程逻辑器件(CPLD)与单片机的结合,完成了光栅信号的滤波、4细分、辨向及可逆计数等功能.实验证明,该设计能够准确完成测量机的数据采集.
Abstract：
Several key pints of articulated arm - cmm data acquisition system are analyzed and designed, including data synchronous latches, pair-radius readings, and coordinates real-time display. The combination of CPLD and AVR microcontroller completes the functions of grating signal faltering, 4 subdivided, discerning direction and reversible counting, and so on. According to the experiment , the data collection of the machine can be complete accurately.展开更多
文摘A 2-D non-uniform sediment mat hmatical model in the boundary-fitting orthogonal coordinate system was develop ed in this paper. The governing equations, the numerical scheme, the boundary con ditions, the movable boundary technique and the numerical solutions were present ed. The model was verified by the data of the reach 25km upstream the Jialingjia ng estuary and the 44km long main stream of the Chongqing reach of the Yangtze r iver. The calculated results show that, the water elevation, the velocity distri bution and the river bed deformation are in agreement with the measured data.
文摘对关节臂式坐标测量机数据采集系统的几个关键点进行了分析设计,其中包括数据同步锁存、对径读数、坐标实时显示.通过可编程逻辑器件(CPLD)与单片机的结合,完成了光栅信号的滤波、4细分、辨向及可逆计数等功能.实验证明,该设计能够准确完成测量机的数据采集.
Abstract：
Several key pints of articulated arm - cmm data acquisition system are analyzed and designed, including data synchronous latches, pair-radius readings, and coordinates real-time display. The combination of CPLD and AVR microcontroller completes the functions of grating signal faltering, 4 subdivided, discerning direction and reversible counting, and so on. According to the experiment , the data collection of the machine can be complete accurately.
