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国外光纤激光器技术在现代战争中发挥着越来越重要的作用。文章介绍了光纤激光器技术的发展历程以及装备的研制、改进情况,指出了在现代战争中发展光纤激光器技术的优势和重要性,重点探讨了几种光纤激光器技术的性能及其特点,最后论述了光纤激光器技术的发展动向与分析。 相似文献
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随着现代科学技术的发展,如何有效防御超高速导弹对舰艇安全构成的威胁成为一个严峻课题.本文分析了高能激光用于舰艇防御时的优越性,阐述了海洋环境对激光器的特殊要求,分别介绍了氟化氘(DF)激光器、自由电子激光器(FEL)及固体激光器(SSL)等3种比较适合在海洋大气环境中使用的高能激光器的原理、发展状况,最后对它们进行了综合比较.DF激光器技术比较成熟.但不适合于近海环境作战;FEL和SSL激光器尚处于发展的初期阶段,技术还不够成熟,但其波长适于近海作战,是未来海军高能激光武器的发展方向. 相似文献
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以2700TEU的某集装箱船为母型,根据远洋船舶轴带发电机系统的工作原理和结构组成,建立系统各主要组成环节的数学模型,并利用MINIS通用仿真支撑平台实现了整个船舶轴带发电机系统的仿真。所建立的数学模型可以仿真轴带发电机系统的正常工作过程和过渡过程,达到了较高的仿真精度。 相似文献
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船舶轴带发电机系统的建模与仿真 总被引:1,自引:0,他引:1
以1700TEU的某集装箱船为母型,研究了远洋船舶轴带发电机系统的工作原理并对其进行数学建模及仿真,所建立的数学模型可以仿真轴带发电机系统的正常工作过程及过渡过程的工况,达到了较高的稳态和动态仿真精度。 相似文献
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Parallel turbine-driven feedwater pumps are needed when ships travel at high speed. In order to study marine steam generator feedwater control systems which use parallel turbine-driven feed pumps, a mathematical model of marine steam generator feedwater control system was developed which includes mathematical models of two steam generators and parallel turbine-driven feed pumps as well as mathematical models of feedwater pipes and feed regulating valves. The operating condition points of the parallel ttu-bine-driven feed pumps were calculated by the Chebyshev curve fit method. A water level controller for the steam generator and a rotary speed controller for the turbine-driven feed pumps were also included in the model. The accuracy of the mathematical models and their controllers was verified by comparing their results with those from a simulator. 相似文献
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T. García A. Velo S. Fernandez-Bastero L. Gago-Duport A. Santos I. Alejo F. Vilas 《Journal of Marine Systems》2005,54(1-4):227
This paper examines the linkages between the space-distribution of grain sizes and the relative percentage of the amount of mineral species that result from the mixing process of siliciclastic and carbonate sediments at the Ria de Vigo (NW of Spain).The space-distribution of minerals was initially determined, starting from a detailed mineralogical study based on XRD-Rietveld analysis of the superficial sediments. Correlations between the maps obtained for grain sizes, average fractions of either siliciclastic or carbonates, as well as for individual-minerals, were further stabilised. From this analysis, spatially organized patterns were found between carbonates and several minerals involved in the siliciclastic fraction. In particular, a coupled behaviour is observed between plagioclases and carbonates, in terms of their relative percentage amounts and the grain size distribution.In order to explain these results a conceptual model is proposed, based on the interplay between chemical processes at the seawater–sediment interface and hydrodynamical factors. This model suggests the existence of chemical control mechanisms that, by selective processes of dissolution-crystallization, constrain the mixed environment's long-term evolution, inducing the formation of self-organized sedimentary patterns. 相似文献
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激光焊接技术在舰船建造中的应用 总被引:8,自引:3,他引:5
介绍了激光焊接技术的发展历史、工业焊接用激光源的基本特点、激光焊接技术用于造船业的优势及其存在的困难,重点介绍了激光焊接技术在舰船建造中的应用实例,包括激光焊接大型船板、激光焊接型材、焊接瓦棱夹层板、激光焊接修复等,指出了在舰船建造中开展激光焊接技术研究的必要性。 相似文献
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为明确停泊发电机与主发电机之间的区别,从船舶检验技术法规和规范要求的角度对其进行比较分析,认为专门设计用于港内停泊使用的发电机组是无法承担主发电机组职责的。另一方面,考虑到停泊发电机与主发电机、应急发电机的关系,讨论了其它发电机组兼用停泊发电机的问题,认为应急发电机组兼用于停泊发电机,应该满足相应的必要条件。 相似文献
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某装备设置有启动电动机启动和高压空气启动两种方式,发动机启动后带动硅整流发电机工作。硅整流发电机励磁由调压器控制,以保持输出电压的稳定。在没有蓄电池、外接电源或硅整流发电机无剩磁时,用高压空气或者其它方式启动发动机,硅整流发电机由于没有励磁而不发电。该装备发动机转速表传感器为三相永磁同步发电机,由发动机传动,只要发动机工作就能发电。实验证明,转速表传感器具备给硅整流发电机提供初始励磁的能力。设计一种装置,只要能启动发动机,均由转速表传感器给硅整流发电机提供初始励磁,使硅整流发电机在任何情况下都能正常供电。 相似文献