论文部分内容阅读
海底管道在铺设过程中或后来受海水冲淘的作用会出现管跨段。为找出海流流激涡旋振动的基本规律,并以此为基础,分析管跨的振动响应、计算管跨的载荷与强度,研究实际管跨的安全可靠性评估的问题,采取了试验研究与理论分析相结合的方法。首先进行了管道的模拟计算,而后在石油大学海洋石油工程研究室模型试验水槽里进行了实验;在实验结果分析的基础上,参考国外有关数据标准,独立编制了管跨的疲劳寿命预测与可靠性分析的计算软件PSFRA。利用该软件,计算分析了不同长度管跨在不同载荷环境条件下的疲劳寿命问题,并给出了可靠度。找出了在稳定海流的作用下,发生同向与横向涡旋共振的条件,及发生涡旋共振时管跨的响应,建立了计算管跨振动的振幅及频率的经验公式。通过计算分析,认为管跨的同向涡旋振动一般不会对管道系统的正常运行构成威胁,而管跨的横向共振则必须予以消除。
Submarine pipe in the laying process or later scouring the role of the sea will appear pipe span. In order to find out the basic rules of vortex vibration of the flow and to analyze the vibration response of the pipe span, calculate the load and strength of the pipe span, and study the safety and reliability assessment of the actual pipe span, the experimental study Methods combined with theoretical analysis. First, the simulation calculation of the pipeline was carried out, and then the experiment was conducted in the model test tank of the Offshore Oil Engineering Laboratory of the University of Petroleum. On the basis of the experimental results, the fatigue life prediction and reliability of the pipe span were independently prepared with reference to relevant foreign data standards PSFRA, a computational software for sexual analysis. By using this software, the fatigue life of pipe span with different length under different load environments is calculated and analyzed, and the reliability is given. The conditions of simultaneous and transverse vortex resonance under steady ocean current and the response of tube span when vortex resonance occurs are found. The empirical formula for calculating the amplitude and frequency of tube cross vibration is established. Through calculation and analysis, it is considered that the same direction vortex vibration of the pipe span will not generally threaten the normal operation of the pipe system, and the transverse resonance of the pipe span must be eliminated.