导管架平台动力特性实验研究

发布时间：2018-07-31 06:18

【摘要】：导管架平台是我国开发海上油气资源的一种主要的海洋平台结构形式,经过多年的发展,其设计、建造、安装的技术已经逐渐纯熟,广泛运用在近海和浅海遮蔽地区,为提升我国石油、天然气储备做了不可磨灭的贡献。在导管架平台设计建造的过程中,对其结构进行动力分析十分重要,关乎着平台在海上的作业安全。在这个过程中采用模型实验可以避免数值模拟在计算过程中的误差,让研究人员更准确的把握结构的动力特性。现在已经有很多研究人员针对于模型实验开展了相关研究。本文针对于某一导管架平台进行模型实验,主要研究内容包括以下几个方面:第一,以某现役导管架平台为原型,依据弹性相似律以1:20的比例并根据实际情况进行简化,设计建造了一个导管架动力相似实验模型,并对原型和模型进行有限元模态计算,验证实验模型与原型动力相似关系,以此模型开展动力实验研究。第二,将力锤、拾振器、数据采集设备组成测试系统,利用锤击法进行模态频率检测,测得该结构的模态频率。第三,将模态激振器、拾振器、数据采集设备组成测试系统,进行随机响应曲线检测。第四,将实验所得结果与数值模拟的结果做比较,结果可知该动力相似模型的模态频率和动力响应曲线与设计相符,结构动力相似相对准确。该模型实验为日后开展损伤检测、水下波浪响应实验等性能检测奠定了基础,对平台的安全服役具有十分重要的现实意义。
[Abstract]:Jacket platform is one of the main offshore platform structure forms in China to develop offshore oil and gas resources. After years of development, the design, construction and installation technology of jacket platform has become more and more mature and widely used in offshore and shallow sea sheltered areas. In order to enhance China's oil, natural gas reserves have made indelible contributions. In the course of design and construction of jacket platform, dynamic analysis of its structure is very important, which is related to the safety of platform operation at sea. In this process, the model experiment can avoid the error of the numerical simulation in the calculation process, so that the researchers can grasp the dynamic characteristics of the structure more accurately. Many researchers have done research on model experiments. In this paper, a model experiment on a jacket platform is carried out. The main research contents include the following aspects: first, taking an active jacket platform as a prototype, simplifying it according to the elastic similarity law at 1:20 and according to the actual situation. A dynamic similarity experimental model of jacket is designed and constructed. The finite element modal calculation of the prototype and the model is carried out to verify the dynamic similarity between the experimental model and the prototype. Secondly, the force hammer, vibration picker and data acquisition equipment are used to test the modal frequency of the structure, and the modal frequency of the structure is measured by hammering method. Thirdly, the test system is composed of modal exciter, vibration pick-up and data acquisition equipment, and the random response curve is detected. Fourth, the experimental results are compared with the results of numerical simulation. The results show that the modal frequencies and dynamic response curves of the dynamic similarity model are consistent with the design, and the dynamic similarity of the structure is relatively accurate. The model experiment lays a foundation for future performance detection such as damage detection, underwater wave response test and so on. It is of great practical significance for the safe service of the platform.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U674.38

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