拖曳系统变速拖曳的振动响应

Towed Cable System Vibration Responses to Varying Towed Velocity

在对拖曳系统数值计算模型进行验证的基础上,采用自动时间分辨率调整算法对拖曳系统受到冲击作用形成的振动响应进行计算。分析拖曳系统的缆长、重力、拖曳速度和加速时长的变化对2个张力振荡时段的影响。结果显示:加速过程中拖曳缆内的张力在短时振荡之后缓慢减小,拖曳系统在获得稳定的动能输入之后呈现出良好的线性行为;终止阶段存在张力陡降段的滞后现象,冲击张力显著大于起始阶段的振荡;若拖曳体质量增大,则振荡冲击作用显示的峰值增大,振荡持续的时间不发生变化,加速终止阶段的峰值减小。加速时段越短,2个阶段的冲击作用越显著;加速时间越长,张力振荡的时段越长。放缆长度增大,弹性效应增大,拖曳系统的冲击效应显著增大。

Based on a validated numerical calculation model,the vibration responses of a towing system under impact are calculated using the automatic time resolution adjustment algorithm.This paper analyses the influence caused by varying the towline length and weight,the tow speed and the acceleration time on two tension oscillating periods.The results show that the tension in the towline gradually decreases after a short period of oscillation during acceleration;the towing system exhibits excellent linear behavior after obtaining stable kinetic energy input;and the hysteresis of tension steep drop is observed during the termination phase,where the impact tension is significantly larger than the oscillations during the initial stage.If the towed mass is increased,the peak of the impact oscillation increases while the oscillation time remains the same,and the peak of the acceleration termination stage decreases.The shorter the acceleration duration,the stronger the impacts of the two stages are;the longer the acceleration duration,the longer the tension oscillation period will be.Increase of the towline will increase the elastic effect,resulting in significant increase of the impact effect on the towing system.