排序方式: 共有39条查询结果,搜索用时 15 毫秒
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该文介绍利用动态仿真软件-MATLAB/SIMULINK对使用可回转推力器的船舶推进装置建立了图形仿真模型,并进行了加速、减速以及从全正车到全倒车等运行工况动态过程仿真和分析,取得了理想的结果。 相似文献
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美国海关“装船前24h申赧舱单规则”的实施,使大多数货主运输威本增加,而中国作为与美国主要贸易往来的国家,这笔费用就更显庞大。介绍了货主减少费用、降低产品物流成本的方法和实践。 相似文献
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客渡船紧急停船仿真研究 总被引:1,自引:0,他引:1
本文着重于采用两种控制策略对紧急停船所需距离进行仿真预测。首先建立船机桨的数学模型,利用动态仿真软件MATLAB/SIMULINK,建立推进系统的动态仿真模型。通过对仿真模型的运算及分析,预测恒转速及变转速模式两种情况下应急停船距离,结果显示均能满足设计要求。 相似文献
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船舶中央冷却系统串级控制的建模与仿真研究 总被引:2,自引:0,他引:2
为了改善船舶中央冷却系统控制性能,针对目前使用传统PID反馈控制的冷却水出口温度控制系统惯性大、经常超调的特点,论文通过对某57 000t散货船中央冷却系统工作原理及其相关控制技术的分析,利用流体力学与传热学理论,建立中央冷却系统水力模型、稳态换热模型和动态换热模型。在此基础上引入串级控制方案,并使用经典控制理论建立控制模型。最后使用MATLAB软件对PID控制方案与串级控制方案进行对比仿真。仿真结果显示串级控制方案拥有良好的控制性能并在船舶中央冷却系统的控制设计中具有广阔的应用前景。 相似文献
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The horizontal vibration of towed seismic streamers is a main reason for efficiency reduction of the seismic survey and tail
tangling. A vibration suppression scheme of towed seismic streamers is investigated in this paper. The towed seismic streamer
is divided into two spans, a controlled span, i.e., the low tension span, and an uncontrolled span, i.e., the high tension
span, by a bird. The system model includes a hyperbolic partial differential equation with variable coefficient describing
the towed seismic streamers, and an ordinary differential equation describing the dynamic of bird. Robust based-model knowledge
and adaptive controllers, based on the Lyapunov method, are designed to isolate the vibration of towed seismic streamers caused
by the course deviations of towing vessel, the variations of towing vessel velocity and the variations of towed seismic streamer
density. The robust based-model knowledge and adaptive controllers exponentially and asymptotically drive the span-towed seismic
streamer displacement to zero, respectively. A finite difference scheme is used to validate the efficiency of the control
law. The proposed controller can isolate effectively the disturbance originated from the towed vessel, and can provide the
improved damping but not sacrifice the isolation performance. The adaptive scheme can tolerate the lack of knowledge of some
uncertain parameters and can directly execute the online adjustment of the parameters. Meanwhile, the proposed control law
is robust and can resist the model uncertainty due to parameter incertitude, model error and unknown disturbance and so on.
The control law only includes velocity and slope, while it does not need the displacement which is difficult to measure in
the practical operations. Thus it is easy to implement. 相似文献
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CODAD推进系统准稳态建模方法及运行性能分析 总被引:3,自引:0,他引:3
本文介绍了基于准稳态方法建立的某船CODAD推进系统仿真模型,并进行了计算机仿真,得到了该船在各种推进模式下的稳态性能参数,在此基础上对该船的运行性能进行了优化计算,得到的结论对该船的控制及运行具有指导意义。 相似文献
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工程系统模糊故障诊断现状 总被引:2,自引:0,他引:2
该文综述了工程系统模糊故障诊断研究的最新研究成果及它的技术难点和发展趋势。FFD技术将为复杂工程系统故障诊断的智能化提供有效的技术支撑。 相似文献