【摘要】 地震拖缆系统的振动是影响海上油气勘探数据采集效率的主要因素,为提高勘探作业效率,研究了地震拖缆系统的主动振动控制问题。地震拖缆系统的重阻尼特性使得实模态控制技术难以实施。在地震拖缆系统有限元模型的基础上,基于模态观测器,在独立复模态空间,通过选择合适的权重矩阵,对地震拖缆的低阶模态设计了稳定的最优控制规律。通过对带有四个水鸟的拖缆系统的主动控制仿真,证明基于复模态的地震拖缆最优控制策略,在最大程度上利用水鸟自带电池能量的基础上,有效地抑制拖缆系统的振动,既能减少悬挂式水鸟更换频率,又能提高数据采集的质量,进而提高勘探作业效率。更多还原

【Abstract】 The vibration of seismic cables is the main Influencing factor in reduction of oil survey data acquisition efficiency.To improve the survey operation efficiency,this paper studies the active control of seismic cables.It is difficult to implement the real mode control techniques due to the heavy damping characteristic of seismic cables.A finite element model of the seismic cables is built.In independent complex mode space,based on mode observer,the optimal control law on low order modes is designed by choosing appropriate weight matrix.Numerical simulation is used to validate the efficiency of active complex mode control law.The result shows that the optimal control law suppresses efficiently the vibration of seismic cables on the basis of utilizing battery energy to the maximal degree.Thus the control law proposed in this paper not only reduces the replacing frequency of birds,but also improves the quality of data acquisition.更多还原