简谐激励下输流管动态响应特性的实验研究

Experimental Study on Vibration of Pipes Conveying Fluid under Harmonic Excitation

对两端受扭转弹簧约束的简支输流管在其支承简谐运动激励下的振动特性问题进行了实验研究 ,重点考察了不同流速下激振频率 f变化对输流管道振动响应形态的影响规律。实验表明 ,在某些频率段上管道会发生多周期的复杂运动 。

The vibration of simply supported pipes conveying fluid with torque springs at both ends, excited by the periodic motion of its supporting base in the direction normal to the pipe span, were experimentally investigated. The experimental system was discussed in the paper. Motions of the system were analyzed by FFT and Time Traces. Attention was concentrated on the effect of forcing frequencies on the behavior of the system. It is found that period doubling motions of the pipe may occur in some regions of forcing frequency, and as a consequence of these period doubling bifurcations, chaotic motions arises. The periodic motion windows were also found in some chaotic regions.