船体梁采样频率和滤波频率确定方法

Parameters of hull girder stress filtering parameters and sampling frequency

船舶在恶劣海况中航行时,船中部的实测应力含有静应力、波浪诱导应力与高频砰击应力等多种成分,应力监测系统中采样频率和滤波频率的选择好坏直接影响后续的数据分析,进一步影响相关人员对船体健康状态的判断。通过对不同应力成分的频率特征分析,分别提出适合实船运用的采样频率、滤波频率确定方法,并通过模型试验验证方法的准确性。

When the ship sails in harsh sea conditions,the hull girder stress of the ship contains many components such as the hydrostatic stress,wave-induced stress and slamming stress.Parameters such as data filtering frequency and sampling frequency are critical for the stress analysis.However,different parameters may affect the analysis result greatly.In this paper,methods for determining the filtering frequency and sampling frequency are proposed based on the frequency characteristics of different stress components,which are verified through the model tests.