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This article provides a complete measurement and control system based on Lab View. By analyzing the characteristics of pipeline inspection robot, the hardware framework including NI PXI-7350 four-axis motion control card and the NI PXI-1411 image acquisition card is designed. The software framework of measurement and control system is put forward based on LabView. Building monitoring and control system...
The cause and mechanism of damage caused by input laser on fiber's input end face are analysised in this paper, when high-power and high- energy laser input into. And a kind of special reflective fiber coupler is developed. It can change laser spot into a light disk whose dimension is equal to or less than the fiber section's. The laser energy is evenly distributed on light disk and the laser power...
It is the more difficult to control when system is at low speed, the delay in speed measurement is a potential risk to controller stability, and friction as well. When controlling a super-low speed device, the stick-slip phenomenon appears. The precision and stability of speed are the key indexes. The mathematical model of PMSM and the system step response are analyzed, the Stribeck nonlinear friction...
Due to the fact that tension system can be affected by many factors and its structures are complex, as well as its deep coupling, nonlinearity, time-variability, and indeterminacy of its parameters, there are still many problems on its basic theoretic, measuring and controlling technology to be solved. On the basis of inferred the system mathematic model and time-variant parameters radius, adopt line...
The Archaean continental crust in China originated from dispersed nuclei under the influence of whirl tectonics 2.5 Ga ago. From the beginning of the early Proterozoic, the crustal evolution process was controlled by the plate tectonics. A tectonic regime of coexisting mobile belts of different characteristics and rigid blocks emerged. The diversity of tectonic setting and structures marked the...
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