支承运动对输流管振动特性影响的实验研究

本文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，并通过倍周期发岔而进行了混沌运动。

Experimental Study on Vibration of Pipes Conveying Fluid under Harmonic Excitation

The vibration of simply supported pipes conveying fluid with torque springs at both ends,excited by the periodic motion of its supporting base in a direction normal to the pipe span,were investigated experimentally.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 frequency 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.