深海资源开采系统球铰硬管接头的设计及系统横向运动分析
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摘要
本文分析了国内外开发的扬矿系统中的联接装置的优缺点。由于海洋环境和作业条件的影响,扬矿管体承受着巨大的弯矩。为了消除弯矩的不良影响,本文提出并设计了一种新的联接装置——球铰接头,其设计特点是扬矿管接头没有焊接部件,联接强度高,拆装快捷,可多次重复使用。该接头使扬矿管只受轴向力,不受弯矩和扭矩,相当于柔性管。
     论文对球铰接头做了详尽的性能分析,进行了关键零件和部位的受力分析和安全校核。提出了防腐措施。用能量损失法分析了螺纹脂密封性能。用有限元法分析了螺纹的滑脱失效。分析结果表明,所研制的球铰式接头能够满足中试系统的作业要求。
     论文以球铰的三维接触问题为切入点,研究了三维接触应力的计算方法。根据变分原理和虚功原理推出了两个球面接触的刚度方程式,并补充了接触条件,得到了四种状态下的定解条件。采用面对面的接触单元作为分析单元。对于接触面上的摩擦问题,则建立了简化的粘滑摩擦理想模型来进行模拟计算。最终计算出了研究对象接触面上的接触应力。
     本文基于修正后的莫里森方程,用数值积分的方法,采用常深度二维小振幅线性波理论,研究了四级和六级海况下,液动力随着水深和时间的变化关系。
     为了考查采用新型接头的效果,本文分别建立了刚性联接和铰接联接两种情况下的静力和动力特性变分数学模型,联合使用有限元和虚拟仿真两种技术,建立计算机分析模型,以海浪周期为8秒和10秒为例,详细分析和比较了刚性和铰接两种联接方式下扬矿管路系统的横向偏移特性。对刚性联接扬矿管路系统横向运动进行仿真分析时,选用管单元来模拟扬矿管。得到了两种海况下扬矿系统水平稳态偏移构型,系统的最大水平偏移发生在扬矿管底端,8秒周期海况下为2.1米,偏移角度为0.14。10秒周期海况下为3.3米,偏移角度为0.21。整体偏移量随着海水绝对深度的增加而增加。对铰接扬矿管路系统横向运动进行仿真分析时,用曲线拟合其水平受力状况。分析得出系统偏移在总体上呈周期性变化,8秒周期海况下大约为50秒。最大偏移量为6.3米,偏移角度为0.40。10秒周期海况下周期大约为57秒。最大偏移量为5.9米,偏移角度为0.38。
     以螺纹联接的扬矿管系统虽然横向偏移较小,但管体承受着一定的弯矩,这对设备的强度和可靠性是不利的。如果采用铰接式扬矿管联接装置,则扬矿管只受轴向力,但系统的横向偏移稍大。不过总体偏移角度仍然很小,只要在设计球铰联接装置时,预留一定的转角余量,则可满足要求。这对整个系统采用球铰联接提供了依据。
     为了验证计算结果的正确性,完成了1000米扬矿硬管系统1:100模型的运动状态试验和球铰接头1:1模型的力学试验。结果表明仿真分析结果是正确的,并能够满足中试系统的工作要求。
The merits and faults of connection device in deep sea mining system are summarized in this dissertation. Because of the influence of both marine environment and work condition, substantial moment is applied to lifting pipes. In order to relieve of its harmful effect, a neotype connection device—spherical joint is designed in the paper. And it has the features of free of welds, high strength and convenient dismounting; moreover, it can be used many times in deep sea mining. With this kind of joint, the moment will be removed from the lifting pipes, so the pipes can be regarded as flexible ones.
     Detailed performance analysis of spherical joint is developed in this paper, including stress analysis and safety check of key components, anticorrosion performance and thread seal effectiveness studied with energy loss method and thread slip stress with finite element method. The results indicated that the spherical joint can meet the work condition of 1000 meters’pilot-scale mining system in China.
     On the basis of 3D contact problem of spherical joint, computational method of 3D contact stress is investigated in the paper. Two rigidity equations of both spherical surfaces are derived from variation principle and virtual work principle. Furthermore, the contact conditions under four contact states are added in order to solve the rigidity equations. Surface to surface contact element is used as analysis element. With regard to the friction on the contact surfaces, the simplified ideal stick-slip friction model is built to simulate it. Finally distribution map of 3D contact stress on the contact surfaces of spherical joint is obtained.
     Hydrodynamic force under different conditions, including marine conditions band 4 and 6, is studied based on Normal Depth 2D Small Amplitude Linear Wave Theory and Modified Morison Equation. All the data are got by numerical integration method. The relationship among three variable parameters, which are hydrodynamic force, sea water depth and time, is presented in visual pictures.
     To study the performance of mining system assembled with spherical joints, static analysis model and dynamic characteristics variation mathematic model are built in the paper, both for thread-connected system and spherical joints connected system respectively. The lateral displacement characteristics of thread-connected system are compared with that of spherical joint connected system by FEM and virtual simulation technology. During the simulation of the first system, pipe element is chosen to simulate lifting pipe. Steady-state lateral displacement shape of lifting system is obtained under different conditions. The maximum lateral displacement is yield at the bottom of lifting pipes, which is 2.1m for band 4 marine conditions and 3.3m for band 6 marine conditions. And the deviation angle is 0.14 and 0.21 for each. Moreover, the displacement is increased with the increase of sea water depth. During the simulation of the second system, the hydrodynamic force is fitted with sinusoidal curve. Its deviation exhibits periodic property with the increase of time. The analysis result is that: under band 4 marine conditions, periodicity is about 50 seconds, its displacement is 6.3m and the deviation angle is 0.40 . While under band 6 marine conditions, the counterpart values are 57 seconds, 5.9m and 0.38 .
     Although the lateral displacement of thread-connected lifting pipes system is smaller, the pipes are subjected to immense moment, which is unfavorable to strength safety and reliability. The pipes of spherical joint connected lifting pipes system are free of moment and only subjected to axial forces, but the lateral displacement of the system is relatively larger. Nevertheless, the overall deviation angle is still small. If a given angle is allowed during spherical joint design, then the spherical joint connected lifting pipes system can meet the specification of 1000m deep sea mining system. According to this point, spherical joints can be widely applied in 1000 meters’pilot-scale mining system in China.
     To examine and certify the precision of analysis, two relevant experiments have been carried out in this paper: one is 1:100 model motion state experiment of 1000m lifting pipes, the other is 1:1 model tension test of designed spherical joint. The results of computation are consistent with those from experiments on the whole. Therefore, the spherical joints can be applied in the deep sea mining system of China.
引文
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