基于传感器的细长体横向低频振动载荷辨识

Identification of transverse low-frequency vibration load of slender body based on sensor

细长体在出水过程中,会遭遇风、浪、流等复杂的海洋环境载荷而引起横向振动。其中,低频振动具有振动能量大、结构相应位移及变形大的特点,加之细长体本身的结构特征,因此,识别横向低频振动载荷最大截面即危险截面进行强度校核是十分必要的。基于传感器在细长体出水过程中所测的横向加速度等信息,在模态叠加法的基础上,开发了一种横向低频振动载荷辨识方法。选取了一个具有解析解的理论模型,通过计算对比发现,本方法的计算结果和解析解吻合良好,从而验证了该方法的有效性。

During process of water-exit, the slender body will suffer a very complex loads environment which may be consisted of wind, waves, as well as currents, which will cause transverse vibration under these loads. Low- frequency vibration is characterized by huge vibration energy ,large structure displacement and big deformation, in addition to the slender structure of the slender body, it is quite necessary to identify and check strength transverse low frequency vibration loads the maximum section, that is dangerous transversal. Based on velocities information measured by sensors and the modal superposition method, a load identification method is developed for transverse low-frequency vibration. A modal with theoretical solution is used to verify the method, and results show good agreement with the theoretical solutions.