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随着扇贝人工养殖业的不断发展,扇贝筏养技术也在不断地改进与提高。其中,吊耳养成这种形式正在被国内外所重视。我们于1980年到1982年进行了栉孔扇贝吊耳养成技术的对比试验,并取得了明显效果。 相似文献
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虾夷扇贝筏式养殖高产技术研究 总被引:7,自引:1,他引:6
虾夷扇贝 (Patinopectenyessonensis)不仅个体肥大、肉质鲜美 ,而且市场广阔、效益明显 ,属人工养殖的优良品种之一。由于它属半栖贝类 ,没有发达的足丝 ,所以 ,开展人工筏式养殖困难较大。笔者于1988年开始研究虾夷扇贝筏式养殖技术 ,在十余年的生产实践中反复摸索 ,终于根据虾夷扇贝的生态习性和生长规律 ,研究出一种新式养成笼和人工筏式养殖方法[1]。于1997年春在同一海区和其他条件相同的情况下 ,进行了养成对比试验 ,取得了令人满意的效果。现已推广应用于规模性生产。1海区条件试验海区位于荣成… 相似文献
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在详细研究影响平台综合性能的诸多因素基础上,克服现有半潜式平台存在的不足,结合自升式平台甲板可以自由升降的优点,开发了具有自主知识产权的自升式半潜多功能深海浮式(JCSM)平台。JCSM平台结合了自升式平台与半潜式平台的优势,并以平台综合性能的提升为目标进行了细节上的优化,稳性裕度大且运动性能优良,可适应干式采油、湿式采油和干湿组合式采油等不同采油模式,并同时具有钻井、早期生产、修井、油气处理与油气储运等多种功能。在详述JCSM平台的组成及性能特点的基础上,对JCSM平台进行了稳性与运动性能数值分析,并与传统半潜式平台相比较,验证了所研发新型平台性能的优越性。研究为未来海洋油气田开发提供了一种新的选择,并对全新概念的浮式平台开发有借鉴和指导意义。 相似文献
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文中论述了海洋环境移动平台观测技术发展现状,强调移动平台观测技术的重要性。通过剖析移动平台观测技术谱系,从顶层设计、关键技术创新、平台载体系统集成及应用技术等方面,分析了未来技术发展趋势,提出了加强我国海洋环境移动平台观测技术的发展建议。 相似文献
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胜利埕岛油田单井拉油平台的设计浅析 总被引:1,自引:0,他引:1
胜利埕岛油田自1993年正式产油以来,已经建成简易式的单井拉油平台10多座,无论是设计、建造和施工还是运行管理都积累了许多成功的经验,根据多年来从事的浅海简易式拉油平台设计经验,结合目前埕岛油田该种类型平台的现况,从设计构思的角度着重阐述了平台结构形式的确定、平台方位的选择、平面布置、系统配套以及安全、环保、救生等系统的设置,以期为今后该种类型平台的设计提供一个较完整的思路。 相似文献
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Wang Zhaojing Zhang Ling
Senior Engineer Geotechnical Engineering Department Nanjing Hydraulic Research Institute Nanjing Engineer Geotechnical Engineering Department Nanjing Hydraulic Research Institute Nanjing 《中国海洋工程》1996,(1)
- In order to verify the theoretical design and computation of a new type of platform, laboratory model test of the superficial sliding of the platform is carried out. Test results show that the requirement for the stability of the platform can be satisfied, and the API-82 criterion can be met. It is also suggested that, in order to enhance the stability of the platform, a buried- pad with porous holes and a long apron-board should be adopted in the design of the new type of platform. 相似文献
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A new method for platform design, named parametric platform design method (PPDM), is presented in this paper in order to improve the mobile platform design efficiency. In this method, an integrated parametric system that fully considers the characteristics of the platform is developed, which significantly optimizes the design process with the top–bottom design concept. In the parametric system, the main geometric dimensions are taken as parameters, while the topology between the structure members, the function requirements and the safety requirements are converted into geometric constraints. By geometric constraint solving (GCS), a set of parameters that satisfy all the given constraints are determined, and then the design scheme is obtained by several core algorithms, such as parametric tank subdivision, 3D stability calculation, parametric structure design, FEM preprocessing, etc. The parametric method greatly increases the changeability and the reusability of the platform model, and concurrent design is well supported. As the model is driven by parameters, PPDM is an excellent method for optimization design. As a result, PPDM has incomparable advantages on the design efficiency over traditional methods. 相似文献
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Offshore jacket platform is widely used as production or oil recovering platform in the shallow sea, and is also applied to the offshore wind turbine supporting structure in the recent years. The jacket structures are normally designed to be conservative and bulky according to various design codes. In this work, a structural optimization design method for jacket platform structure has been developed based on topology optimization theory. The topology optimization method is applicable at an early design stage, which can determine the initial structure and force transmission path. The whole design space is chosen as design variables, and the goal is to maximize the structural stiffness. A set of constraints based on multi-criteria design assessment is applied according to standard requirements, which includes stress, deformation, vibration and design variable constraints. The optimization results are compared with the original platform for static performance, dynamic performance and Ultimate Carrying Capacity (UCC). Results show that the optimized structure show a 13.7% reduction in the global mass, 46.31% reduction in the maximum equivalent stress, and large ultimate carrying capacity ability under the same environmental loads. It is demonstrated that the proposed topology optimization method is capable of effectively determining the optimal design of jacket platform structures. 相似文献
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海上钻井平台由于工作地点经常发生变化,工作环境条件随之改变,锚泊抛锚方式就要相应更改。本文针对深海半潜平台及其悬链线式系泊定位系统,运用平台与锚链耦合运动时域分析方法,对其水动力性能进行探索,并提出一种运用模糊算法计算平台抛锚方式优化设计方法,此方法可使钻井平台在风暴自存工况和钻井工作工况下更快更好地找到最佳抛锚方式。以一典型的半潜式钻井平台为例进行数值模拟,结果表明本文提出的方法是可行的,能够很方便地找到比较好的抛锚方式来满足相关要求。这种锚泊优化设计方法可为平台及其系泊系统设计提供参考。 相似文献
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从提高锚泊系统收放时效性入手,提出了一种半潜式钻井平台复合式锚泊系统组分配比优化设计方法,旨在尽可能降低复合式锚泊系统的钢链配比长度,提高收放效率。结合锚泊系统设计参数,制定优化设计准则,建立优化分析流程,采用ANSYS-AQWA建立锚泊定位半潜式平台水动力分析模型,获得平台运动参数和锚链动力参数,对平台漂移量、锚链最小安全系数、走锚临界张力、锚链最小卧底长度和起锚力进行无量纲指标分析,并综合考虑张力倾角与预张力对优化结果的影响,获得复合式锚泊系统钢链与钢缆的最优配比关系,确定最优钢链长度为395 m,较原钢链长度缩短225 m,钢链收放时间降低36%,进一步提高锚泊系统收放时效性,并降低平台可变荷载。 相似文献
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The concrete-steel platform structure is rather complicated because it involves such materials as concrete, reinforcing bars, steel, and so on. K the traditional dimension optimization method is employed, the optimal design of the platform will meet many handicaps, even it cannot be implemented at all. The multilevel optimal design approach is an efficient tool for the solution of large-scale engineering structures. In this paper, this approach is applied to the optimal design of a concrete-steel platform, which is formulated as a system level optimal design problem and a set of uncoupled substructure level optimal design problems. The process of optimization is a process of iteration between system level and substructure level until the objective function converges. An illustrative example indicates that this method is effective in the optimal design of concrete-steel platforms. 相似文献