摘要
研究有缆遥控潜水器(Remote Operated Vehicles)的脐带缆受到轴向激励所产生的大幅横向振动,即参量共振。ROV脐带缆的参激现象发生会影响ROV的安全性。针对ROV脐带缆的结构特性,推导出其在轴向激励力下的非线性振动方程。运用希尔无穷行列式的方法分析脐带缆的参量不稳定性。以稳定性图为基准分析脐带缆在多种典型工况下的动力响应,着重讨论了系统阻尼对于脐带缆稳定性的影响。研究结果表明:阻尼的增大可以减小脐带缆可能发生参量共振的范围,即阻尼起到抑制共振的作用,特别是次阶稳定区域受到的影响较大;但当系统参数已经处于不稳定区域时,系统阻尼并不能起到抑制振幅的作用。
A small axial excitation on the umbilical of Remote Operated Vehicles （ROV） will produce a large transverse vibration, it is called parametric resonance. The parametric excitation on the ROV umbilical will affect the security of the ROV. Aiming at the structural characteristics of ROV umbilical, the nonlinear vibration equation caused by axial forces is deduced. The parametric instability is analyzed with the method of Hill＇s infinite determinant. Base on the stability diagram without or with damping, the dynamic responses in variety of typical working conditions are studied, the effect of system damping on the stability is discussed then. The results show that the increase of damping can reduce the unstable range where parametrically excited oscillations takes place, especially the low-order unstable regions are more gready influenced. But when the system parameters have been in an unstable region, the system damping would not reduce the vibration amplitude.
出处
《海洋技术》
北大核心
2011年第3期77-82,共6页
Ocean Technology
基金
国家自然科学基金资助项目(51009093)
国家自然科学重点基金资助项目(50739004)
关键词
有缆遥控潜水器
脐带缆
参量共振
马修不稳定性
动力响应
remote operated vehicles
umbilical
parametric resonances
Mathieu instabilities
dynamic response
