In the paper, to study the national frequency of fluid pipes, selected pipe as the object. Though the vibrate experiments of different speeds, to acquire the corresponding national frequency and the dependency curve of speeds and national frequency. Analyze the fluid pipes national frequency in theory. According to the concept of sensibility, segment the pipe, and calculated the corresponding national frequency. Ascertain the measurement according to the characters of the object. Have experiment and acquire the curve of the national frequency changing with speed. Deduce the formulate of the speed affected, acquire the formulation of speed and national frequency.
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