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A fast correlated imaging method based on strip division in large scenes is proposed. By transmitting narrow-pulse random signals synchronously from random radiation radar array, the whole imaging area is divided into multiple strips in range direction, then correlated imaging model in strip mode is established, which reduces the scale of its imaging matrix equation greatly; By multi-strip stitching,...
Many characteristics were distilled based on the vibration signal from gear-box Accelerated Life Testing. After analyzing the stability and sensitiveness of these characteristics, the factors, such as Clearance Factor, Crest Factor, Shape Factor and Root Mean Square, were selected and used. Then a residual useful life prediction model of gear-box based on stochastic filtering was established, which...
Since Volker Strassen proposed a recursive matrix multiplication algorithm reducing the time complexity to n2.81 in 1968, many scholars have done a lot of research on this basis. In recent years, researchers have proposed using computer algorithms to solve fast matrix multiplication problem. They have found Strassen's algorithm or other algorithms that have the same time complexity as Strassen algorithm...
Diesel traction Locomotives are widely used in railway tunnels in the plateau of China. Harmful gases given out by internal combustion engines must be excluded from the tunnel for human safety on railway. In the present study, nitrogen dioxide (NO2) was taken into account as a representative harmful pollutant of the investigation object. Natural ventilation of diluting the concentration of NO2 pollutant...
Among the diesel traction railway tunnels on Lhasa-Rikaze line of China, some of two tunnels are adjacent. When a train gets across a given tunnel, air pollutants extruded from the exit of the tunnel may diffuse towards the entrance of its neighboring tunnel and thus it results in thereof air pollution. The so-called cross pollution can affect the established ventilation scheme of excluding pollutants...
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