爆炸载荷下半潜式钻井平台月池结构动态响应

以某半潜式钻井平台月池结构为研究对象,基于一般耦合法建立拉格朗日与欧拉网格的耦合,计及应变率效应的影响,应用二阶精度求解器ROE算法结合等效当量TNT方法及理想气体状态方程,参考API规范要求设置多组计算工况,对月池结构在不同爆源高度及不同当量载荷下的动态响应进行了数值分析研究。研究发现：整体结构抗爆性能较好,未有结构发生破损失效。当爆源高度超过41.55m或当载荷增大时,对X方向月池内壁板格造成的冲击与变形损伤更大,该处结构在防爆设计时应重点考虑;平台沿Y方向的舱壁为主要吸能构件,占比最低为44.7%,当爆源高度降低时,吸能占比增加,当爆炸载荷增大时,吸能占比降低;沿X方向的舱壁吸能占比稳定约为24%。本文的研究对于评估平台结构抗爆性能,优化结构设计等方面具有一定的参考价值。     

Experimental and numerical study on dynamic responses of floating bridge under the shielding effect of a floating platform

A floating bridge and a floating platform can serve as a transport channel between land and sea. They will interact with each other in the wave environment. In this paper, the dynamic response characteristics of a floating bridge under irregular waves and regular waves are studied by means of model tests and numerical calculations. The results of model test and numerical calculation based on potential flow theory are basically consistent and can be mutually verified. By comparing and analyzing the dynamic response results of the floating bridge under the condition of “with floating platform” and “without floating platform”, some conclusions are drawn. The floating platform will have a shielding effect on waves coming from the sea. Due to the shielding effect of the floating platform, the motions in heave, surge and pitch of the floating bridge are evidently diminished. Among them, the motion response of the pontoon near the floating platform decreases most obviously. The floating platform provides a relatively stable marine environment for the floating bridge, thereby improving the survival state of the floating bridge.     

系泊Spar平台波浪中耦合运动的数值模拟及模型试验

为了研究恶劣环境载荷引起海洋结构物的非线性运动响应,文章基于三维时域格林函数理论,提出了采用时域物面非线性理论方法直接模拟系泊浮体时域耦合分析所需的水动力,建立了系泊浮体波浪中时域耦合运动的数学模型.该方法充分考虑了每时每刻浮体在瞬态波面下湿表面的变化,并计及平均水线面下瞬时空间位置的改变,系统研究了系泊Spar平台波浪中的耦合运动响应及系泊线张力.最后,将数值模拟结果与模型试验结果进行了比较,计算结果令人满意.     

三峡—葛洲坝两坝间航道整治工程方案试验研究

三峡-葛洲坝两坝间为川江航运咽喉,制约着航运和调峰能力的提高.分析两坝间航道控制河段的地形边界特性及碍航原因,通过模型试验及数值模拟对各整治工程方案的效果进行了比选及可行性分析,并选择典型调峰方案予以验证.推荐了有效可行的整治方案.