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本文给出导管架式海洋平台模型在五种不同介质中模态参数的识别结果,观测了水及回填砂对模型的固有频率、阻尼比和振型等模态参数的影响及其变化规律,试验了甲板质量及其质心偏移对模态参数的影响,发现丁模型构件节点开裂导致甲板振型变化远大于模型固有频率的下降。有限元计算结果与试验结果的一致性表明,依据试验结果不断地修改计算数学模型是建模修模的有效途径。
This paper presents the identification results of the modal parameters of the jacket-type offshore platform model in five different media, and observes the effects of water and backfill sand on the natural frequency, damping ratio and mode shape of the model and its variation law. The effects of deck mass and centroid shift on the modal parameters were tested, and it was found that the cracking of the joints of the D model component caused the deformation of the deck shape to be much larger than the decrease of the natural frequency of the model. The consistency between the finite element calculation results and the experimental results shows that the continuous modification of the computational mathematical model based on the test results is an effective way to model repair.