| 弹性支撑条件下水平板波浪冲击作用试验加速度响应频率分析 |
| Frequency Analysis of Acceleration Response in Wave Impact Experiment of Water Plate Under Elastic Support Conditions |
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| DOI：doi：10.3969/j.issn.1003-2029.2025.05.008 |
| 中文关键词: 透空式水平板 弹性支撑 加速度响应 主振频率特征数 固有频率特征数 |
| 英文关键词:a horizontal plate of an open-type offshore platform elastic support acceleration response characteristic number of main vibration frequency characteristic number of natural frequency |
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| 中文摘要: |
| 为研究以透空式海洋平台等为代表的建筑物遭受波浪冲击下的结构动力响应问题，通过物理模型试验的方法，对弹性支撑条件下透空式水平板的动力响应问题进行试验研究。试验对表征结构振动的加速度信号进行高频采集，对加速度信号进行快速傅里叶变换（Fast Fourier Transform，FFT），得到与结构物固有频率相对应的频率特性。水平方向加速度信号频谱分析表明：结构物振动主频率为接近结构物水平方向固有频率的倍频处，远离此倍频的能量迅速减小；竖直（垂直） 方向加速度信号频谱分析表明：结构物固有频率处，振动能量分布最为密集。附加质量的存在会影响结构物主振频率，表现在不同净空条件下，振动能量密集处的频率值上的差异性。通过对参数无量纲化处理，探究了波浪作用下主振频率特征数与固有频率特征数之间的关系，以及主振频率特征数与相对净空之间的关系，为进一步探寻海洋平台结构动力最大响应和固有特性之间的关系，以及海洋建筑物的设计和防振工作提供参考。 |
| 英文摘要: |
| This study investigates the structural dynamic response of buildings represented by permeable offshore platforms under wave impact. Through physical model tests, the dynamic response of a permeable horizontal plate under elastic support conditions is experimentally studied. The test performs high-frequency acquisition of acceleration signals characterizing structural vibration and conducts FFT transformation on the acceleration signals to obtain the frequency characteristics corresponding to the natural frequency of the structure.
Spectrum analysis of horizontal acceleration signals shows that the main vibration frequency of the structure is at a multiple frequency close to the horizontal natural frequency of the structure, and the energy away from this multiple frequency decreases rapidly. Spectrum analysis of vertical acceleration signals indicates that the vibration energy is most concentrated at the natural frequency of the structure. The presence of additional mass affects the main vibration frequency of the structure, which is reflected in the difference in frequency values where the vibration energy is concentrated under different net clearances. Through dimensionless parameter processing, this study investigates the relationship between the characteristic number of the dominant vibration frequency under wave action, and the characteristic number of the natural frequency, as well as their correlation with the relative clearance. The findings provide a reference for further exploration of the relationship between the maximum dynamic response and inherent characteristics of offshore platform structures, thereby supporting the design and vibration prevention of marine structures. |
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