共查询到20条相似文献,搜索用时 640 毫秒
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描述了传统造船工序作业计划管理的方法,并分析了目前工序作业计划制定方法存在的不确定性和局限性,将灰色理论的预测方法应用于造船工程项目中工序作业计划的制定,应用实例建立了分段工序作业时间的预测模型,并对模型进行了精度检验和模型精度指标评估,评价结果有效,有助于造船生产过程中更为精确的管理,提高造船企业的生产效率。 相似文献
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针对具有开口群的船舶集成上层建筑,使用ANSYS分析其开口区域的强度特性。在多方案有限元计算的基础上,提出兼顾计算精度和计算成本的强度计算模型。基于该模型,以影响开口区域应力的主要设计参数为设计变量,构造了快速预报开口群角隅节点应力的4种代理模型,并对这4种代理模型进行误差检验,得出在所选取的样本点比例下,Kriging代理模型拟合精度较高。因此,采用构造的Kriging模型分析了结构尺寸对开口角隅节点应力的影响。结果表明:开口面板厚度的变化对角隅节点应力水平影响最大。 相似文献
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Shoji Takechi Kazuhiro Aoyama Toshiharu Nomoto 《Journal of Marine Science and Technology》2002,6(3):158-167
In ship hull production, the accuracy of management activities is extremely important. The block positioning operation in
the erection stage is a key process in such management. The quality of the block positioning determines not only the accuracy
of the final hull, but also the productivity and cost at the erection stage. We have previously proposed the basic concepts
of computer-aided accuracy management. Accuracy management activities consist of "accuracy planning activities" and "accuracy
measurement activities." Accuracy measurement activities involve checking and coping with inaccuracy. We have also proposed
a system of accuracy measurement metrics: one is accuracy for completion (e.g., straightness, flatness), and the other is
accuracy for construction (e.g., the relative joint shapes of each part). This paper explains the detailed accuracy metrics
for a block positioning operation in the erection stage. The quality of the block positioning operation is estimated by this
system: the accuracy of the completed hull can be evaluated by the concept of tolerance, and the accuracy of the construction
process can be evaluated by the concept of labor costs. The prototype of this accuracy metrics system is then implemented.
This metrics system is combined with the optimization software program iSIGHT to decide the best block positioning process.
Then some examples of the block position optimizing process are shown.
Received: November 2, 2001 / Accepted: December 6, 2001 相似文献
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为了提高船舶中小组立等中间产品建造作业调度能力,提升船舶建造效率,提出面向多约束的船舶组立建造作业调度方法。首先,分析船舶组立建造的工艺流程和作业调度方法,综合考虑机器小组、工艺和交货期等多种约束条件,以建造周期最短为调度目标,建立船舶组立建造作业调度数学模型;其次,综合运用算法分解策略及调度规则,设计改进的最短作业优先调度算法实现模型求解;最后,以某船厂建造车间一定生产周期(17天)的中小组立先行中日程计划为对象,验证该方法的有效性和实用性。研究结果表明,所提出的面向多约束的船舶组立建造作业调度方法相较于当前的调度方法,排产周期压缩22小时,即缩短了原有周期的16.18%,有效提高了生产计划排产和作业调度效率。 相似文献
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The effect of line voltage drop is considered larger on loads, especially on asynchronous motor, transformers and other non-linear
load parameters in power system of large ships. A novel power flow method based on improved node voltage method is proposed,
and a typical ship power system, which has 2 power stations and 10 nodes, with closed-loop design but open-loop operation,
is taken as an example. Simulation results show that the improved power flow calculation method has achieved higher accuracy
and better convergence. 相似文献
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