共查询到19条相似文献,搜索用时 125 毫秒
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选取装修结束并持续通风3天后的某舰船典型舱室为研究对象,在码头停泊状态采用Tenax TA采样管富集采样和ATD-GC/MS方法测量舱室挥发性有机化合物(VOCs)的释放特征,利用NIST08谱库和标准物质进行定性和定量分析。研究发现,装修后舰船舱室环境VOCs浓度水平显著高于装修前,舱室封闭期间(4 h)典型苯系物和总挥发性有机化合物(TVOC)释放速率基本恒定,其中浓度最高且释放速率最大的VOCs包括二甲苯、环己酮和乙苯等。因此,建议加强舰船装修期间的材料使用和施工工艺管理,从源头上控制装修污染,并在装修过程中和结束后加强通风。 相似文献
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综述了化学计量学方法在色谱峰检测优化方面的应用,内容涉及曲线拟合、因子分析、小波变换、人工神经网等方面。展望了我国化学计量学在色谱峰检测中的应用前景,共引用参考文献43篇。 相似文献
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傅里叶红外光谱仪在各个领域得到广泛的应用,文章综述了目前该仪器在船舶设备油液监测诊断方面的应用现状和应用原理,列举了应用实例,对该仪器在监测诊断方面的应用提出了一些建议。 相似文献
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热管技术在动力工程中的应用 总被引:1,自引:0,他引:1
热管技术近年来在工程中的应用日益普及,不仅在传统的传热传质设备更新改造方面显示出了强大的生命力,而且在余热回收、节能方面取得了显著效果.本文简析了热管技术在能源动力中的应用特点及发展. 相似文献
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模糊控制技术在换热器控制系统中的应用 总被引:2,自引:0,他引:2
文章分析了换热器的控制形式,并将模糊控制技术引入到换热器进出口水温的控制。根据基本模糊控制器的结构、原理,设计了模糊控制器的主要环节,基于MATLAB下对模糊控制和PID控制进行了模拟对比,结果表明,模糊控制动、静态性能,控制规则简便,适应性强,能更有效快捷的控制换热器进出口水温。 相似文献
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本文提出了一种模拟挖槽内三维流动的数学模型.该模型将压力分解为动水压力与静水压力之和.由控制体积法导出三维偏微分方程的离散格式.采用Patankar和Spalding提出的压力校正法求解动水压力场.然后求解水位控制方程.用最新求出的水位替代压力校正法中的水位.如此循环迭代直至收敛.该模型无须采用“静水压力假定”和“刚盖假定”.能够模拟不可压缩流体含自由表面流动问题.利用该模型计算得到的挖槽内流速分布与水槽试验值吻合.此外,本文还计算了相当于天然情况各种水深、各种挖深比、各种挖槽底宽下挖槽内的流场. 相似文献
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A numerical method was developed to predict the water impact pressure caused by green water phenomena. The density function method was employed in the framework of a locally refined overlapping grid system. The simple problem of a rectangular body placed in regular waves was considered and the simulation results were compared with tank experiments. Good agreement with experiment was shown for wave–body interactions and for the pressure values at three different positions on the body. The case of a rectangular body with a vertical wall on the deck was also considered and the comparison showed satisfactory agreement. It was demonstrated that this method could be extended to a moving body problem, in which the body was free to undergo heave, pitch, and surge motions. 相似文献
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天津港半圆体防波堤工程沉降位移分析 总被引:1,自引:0,他引:1
半圆体防波堤结构首次在天津港北大防波堤超软地基上应用,工程施工过程中实测了大量数据,通过对资料的分析,揭示了沉降规律,得出了适于该工程的地基参数,并对内侧吹泥对堤身的影响做出了分析,为类似工程的施工积累了经验。 相似文献
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Makoto Sueyoshi Masashi Kashiwagi Shigeru Naito 《Journal of Marine Science and Technology》2008,13(2):85-94
The moving particle semi-implicit (MPS) method was applied to compute nonlinear motions of a floating body influenced by the
water on deck. To compute the motions of a rigid body, the fluid pressure at the position of each particle on the body surface
was directly integrated in space and the equations of translational and rotational motions were integrated in time to determine
the correct position of the rigid-body surface at each time step of the time-domain calculation. The performance of this method
was validated through a comparison with measured results in an experiment that was newly conducted using a model of a box-shaped
floating body with a small freeboard. Although the overall agreement was good, some discrepancies were observed for a shorter
wave period, especially for the drift motion in sway. The effect of numerical resolution on the results was checked by changing
the number of particles. With a higher number of particles, no obvious improvement was seen in the global body motions, but
the resolution of the local free-surface profile, including the water on deck, was improved. 相似文献
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GU Hao KANG Feng-ju NIE Wei-dong 《船舶与海洋工程学报》2006,5(2):30-35
1Introduction Homingtrajectoryisthemostimportantaspectwithin exteriortrajectoryofanacoustichomingtorpedo.Thus,homingtrajectoryshouldreceivemuchattention intorpedotrajectorysimulations.Inthisresearchpro ject,atorpedoacoustichomingtrajectorysimulation progr… 相似文献