轨道不平顺激励下悬浮隧道车隧耦合振动响应分析

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Abstract Submerged floating tunnel (SFT) is a novel closed traffic structure suspended under water.Here, in order to analyze vehicle-tunnel coupled vibration responses of a SFT due to track irregularities, it was simplified as a spatial beam on discrete elastic supports with a spring-mass vehicle moving on it.Considering fluid added inertia effect and damping effect with Morison equation, the governing dynamic differential equations for vehicle-tunnel coupled vibration responses of the SFT due to track irregularities were established.Adopting the fourth-order Runge-Kutta method based on MATLAB, these dynamic differential equations were numerically solved.The results showed that the vehicle-tunnel coupled vibration responses of the SFT are affected by both track irregularities and fluid effects; the structure displacement responses due to fluid effects increase by about 3%; the structure displacement responses due to track irregularities increase by about 5% to 10%; besides, the tether stiffness can suppress the structure displacement responses under excitation of track irregularities, the SFT with larger tether stiffness is more sensitive to track irregularities, and its local vibration is more acute; furthermore, the fast moving vehicle may cause more intensive vibration of the coupled system under excitation of track with larger irregularities, to control track irregularities can reduce the effects of vehicle-tunnel coupled vibration of the SFT on moving vehicles with high velocity.

Key words： Submerged floating tunnel Track irregularities Vehicle-Tunnel coupling vibration Tether stiffness Vehicle velocity

Received: 15 September 2017 Published: 28 December 2018

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	LIN Heng
	XIANG Yiqiang
	CHEN Zhengyang
	YANG Ying

Cite this article:

LIN Heng,XIANG Yiqiang,CHEN Zhengyang, et al. Vehicle-tunnel coupled vibration responses of a submerged floating tunnel under excitation of track irregularities[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(1): 1-7.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I1/1

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