清淤输泥的新方法新设备     

陶松垒  王康林  陶钧炳  谢远富  周良荣 《海洋学研究》2006,24(Z1):113-120

为解决中低滩涂沉积的深厚软粘土层的输送难题,提出了一种清淤输泥的新方法,研制了能远距离输送高浓度、大粘度、低含水量的淤泥和软粘土的土方施工新设备:包括进料口、推送器、表面膜发生器、脉冲切割器、定位系统、智能控制系统、输料管道、管道浮子等。该设备具有能耗低,工效高,效益好;结构简单,故障少,运行维护方便;定位准确性高;自动化程度高等特点。可广泛应用于水利、环保、建筑工程中的淤泥和软粘土输送。  相似文献   

Research on Maneuverability and Simulation of Underwater Vehicles for Pipeline Detection and Maintenance     

张韶光肖熙  孙东昌 《中国海洋工程》2006,20(1):147-154

1 .IntroductionWiththe advent of underwater vehicle technology in the offshore industry, major survey and in-spectiontasks can be done at lower cost withfaster execution.Pipe inspection is of major interest inthat respect because thousands of meters of pi…  相似文献   

近底管线上的波浪力   总被引：1，自引：1，他引：1  

赵德庭  任佐皋 《海洋学报》1991,13(3):393-400

本文利用物理模型试验,同步测试了近水底管线在波浪作用下的水平力和外力,并应用莫里逊公式、二阶斯托克斯波理论,按最小二乘原理统计了水平力系数C_D和C_M,分析了它们与KC数间的关系,提出了经验式。本文重点探讨了升力过程线的计算模式,采用傅氏级数法分析了实测升力过程线,提出了五阶升力系数及其相应的初相位值与KC数的经验关系式,从而,首次提出了计算升力和合力过程线的方法。文中还通过实例,比较了力过程线的实测值和计算值,讨论了最大合力值及其相位特征等。  相似文献   

An Analysis on Limit Load for Corroded Submarine Pipelines     

谭开忍  肖熙 《中国海洋工程》2006,20(3):483-490

1 .Introduction Submarine pipelines are one of the safest and the least environmentally disruptive means for ma-rine gas or oil transport . With the development of exploitation of submarine oil or gas ,the safety ofsubmarine pipelines has becomethe major …  相似文献   

海底油气管道保护电位检测装置的研究     

郭津年  徐斌  卢阿平  曾仁森  吴佳林 《海洋科学》1990,14(5):53-57

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基于AHP法和灰色模式识别理论的海底管道系统路由定量风险评估   总被引：3，自引：1，他引：3  

徐慧 肖楠郭振邦  王金英 《海洋工程》2005,23(4):105-110

根据海底管道路由潜在风险的特点及风险类型,提出了一种将层次分析法（AHP法）和灰色模式识别理论相结合的海底管道系统路由定量风险评估方法,该方法利用AHP确定风险评价指标体系,运用灰色模式识别理论,建立识别结果标准,并结合实际工程进行计算,计算结果表明该方法是可行的.  相似文献   

Nonlinear Static Finite Element Stress Analysis of Pipe-in-Pipe Risers   总被引：4，自引：1，他引：4  

周宏杰  闫澍旺崔溦 《中国海洋工程》2005,19(1):155-166

Owing to the complexity of the pipe-in-pipe (PIP) riser system in structure, load and restraint, many problems arise in the structural analysis of the system. This paper presents a new method for nonlinear static finite element stress analysis of the PIP riser system. The finite element (FE) model of the PIP riser system is built via software AutoPIPE 6.1. According to the specialties of a variety of components in the PIP riser system, different elements are used so as to model the system accurately. Allowing for the complication in modeling the effects of seabed restraint, a technique based on the bilinear spring concept is developed to calculate the soil properties. Then, based on a pipeline project, the entire procedure of stress analysis is discussed in detail, including creation of an FE model, processing of input data and analysis of results. A wide range of loading schemes is investigated to ascertain that the stresses remain within the acceptable range of the pipe material strength. Finally, the effects of the location of flanges, the thermal expansion of submarine pipelines and the seabed restraint on stress distribution in the riser and expansion loop are studied, which are valuable for pipeline designers.  相似文献   

A Numerical Model for Natural Backfill of Pipeline Trenches Subjected to Unidirectional／Oscillatory Flows     

LIANGDong-fang CHENGLiang KervinYEOW 《中国海洋工程》2005,19(2):269-286

A numerical model for the self-burial of a pipeline trench is developed. Morphological evolutions of a pipeline trench under steady-current or oscillatory-flow conditions are simulated with/without a pipeline inside the trench. The oscillatory flow in this study represents the action of waves. The two-dimensional Reynolds-averaged continuity and Navier-Stokes equations with the standard k-e turbulence closure, as well as the sediment transport equations, are solved with the finite difference method in a eurvilirrear coordinate system. Both bed and suspended loads of sediment transport are included in the morphological model. Because of the lack of experimental data on the backfilling of pipeline trenches, the numericalmodel is firstly verified against three closely-relevant experiments available in literature. A detailed measurement of the channel migration phenomenon under steady currents is employed for the assessment of the integral performance of themodel. The two experimental results from U-tube tests are used to validate the model‘s ability in predicting oscillatory flows. Different time-marching schemes are employed for the morphological computation under unidirectional and oscillatory conditions. It is found that vortex motions within the trench play an important role in the trench development.  相似文献   

SYF1-1型海洋金属防腐装置     

杨立  王孟馨 《海洋技术学报》2003,22(2):84-86

SYFl—1型海洋金属防腐装置是一种用于潮汐发电设备、海洋石油平台、输送海水管道、船舶等海洋金属防腐的装置。文中对该装置的工作原理、组成、主要技术性能、特点以及实现方法作了概要描述。  相似文献   

沟槽内海底管道的水动力特性研究   总被引：1，自引：0，他引：1  

邢至庄  张日向  郭建江 《海洋工程》1997,(4)

基于水力模型实验，引入相对沟形系数αｒ，获得了以αｒ为表征的相对水动力系数与ＫＣ数的关系；对于浅沟而言，这种关系较有规律性。根据所设计沟形的αｒ值和所选定的ＫＣ值，应用本文结果，可以方便地判断其力折减程度和掩护效果  相似文献