扣入式与缠绕式止屈器联合作用的止屈效率

利用Abaqus软件建立并优化扣入式止屈器和缠绕式止屈器的有限元模型,通过试验验证模型的正确性。提出2种全新的联合作用式止屈器模型,并详细研究影响止屈器穿越压力的主要敏感性因素(包括长度、匝数、壁厚、间距、缠绕方式)对于扣入式止屈器、缠绕式止屈器、联合作用式止屈器止屈效率的影响,得到2种不同的穿越模式。通过与单独扣入式和缠绕式止屈器进行对比,分析二者联合作用的止屈效果,可为实际工程应用提供参考。     

静水条件下海底管道二维溢油敏感性分析

基于有限体积法,对静水海洋环境条件下海底管道二维溢油进行了研究。数值模型选用k-ε两方程模型,采用VOF方法追踪油水界面。基于前期模型验证结果,对水下溢油问题进行了敏感性计算。计算中考虑不同原油密度、原油黏度、溢出速度的影响,对溢油到达海面时间进行了分析。     

Laboratory investigation of the hydroelastic effect on liquid sloshing in rectan- gular tanks

A sloshing experiment is conducted to study the hydroelastic effect in an elastic tank. For this purpose, a translational harmonic excitation is applied to a 2-D rectangular tank model. The lowest-order natural frequencies of the liquid in the tank are determined through the sweep test. The wave elevation and the sloshing pressure are obtained by changing the excitation frequency and the liquid depth. Then the characteristics and the variation of the elevation and the pressure are discussed. The results are compared with the experimental results and the theoretical calculations in a rigid tank. Our analysis indicates that, in the non- resonant cases, the elastic results, the rigid experimental results and the theoretical values are all close to each other. In contrast, under the resonant condition, the elastic experimental result is slightly smaller than the rigid one. Also, the theoretical values are smaller than the experimental results at the resonant frequency.