多级增压控制管路节流气穴噪声的试验研究

在试验研究的基础上，论述了多级节流增压模拟水泵实际运行背压具有的低噪声特性，并在此基础上对管路系统的低噪声设计提出了几点建议。     

船舶操纵回转特性的多目标优化设计应用

定常回转直径作为衡量船舶操纵性的一个指标受到人们的普遍重视。为提高船舶的回转性能,基于船舶四自由度的操纵性方程,分析船舶回转直径和回转横倾,讨论影响回转性能的舵型因素,并将其作为优化设计变量,利用Isight优化设计平台,采用遗传算法进行舵型参数的优化设计。通过选取某高速船作为优化对象,利用该方法进行舵型优化后,回转直径及回转横倾都减小。表明借助Isight的优化功能可以实现船舶操纵性能的优化。     

Application of H∞ control in rudder/flap vector robust control of a ship''s course

Given the uncertainty of parameters and the random nature of disturbances that effect a ships course, a robust course controller should be designed on the basis of rudder/flap vector control. This paper analyzes system uncertainty, and the choice of weighting functions is also discussed. When sea waves operate on a ship, the energy-concentrating frequency varies with the angle of encounter. For different angles of encounter, different weighting functions are designed. For the pole of a nominal model existing in an imaginary axis, the bilinear-transform method is used. The "2-Riccati" equation is adopted to solve the H∞ controller. A system simulation is given, and the results show that, compared with a PID controller, this system has higher course precision and more robust performance. This research has significant engineering value.     

矩阵法舵系计算程序开发

按照中国船级社规范规定的舵计算模型,介绍矩阵法在舵系计算当中的编程实现,理论分析和有限元计算表明该编程方法可以适应不同的结构形式和支撑条件,计算结果可靠。     

Application of H~∞ control in rudder/flap vector robust control of a ship's course

Given the uncertainty of parameters and the random nature of disturbances that effect a ships course, a robust course controller should be designed on the basis of rudder/flap vector control. This paper analyzes system uncertainty, and the choice of weighting functions is also discussed. When sea waves operate on a ship, the energy-concentrating frequency varies with the angle of encounter. For different angles of encounter, different weighting functions are designed. For the pole of a nominal model existing in an imaginary axis, the bilinear-transform method is used. The "2-Riccati" equation is adopted to solve the H∞ controller. A system simulation is given, and the results show that, compared with a PID controller, this system has higher course precision and more robust performance. This research has significant engineering value.     

舰舵参数记录分析仪设计与实现

介绍舰舵参数记录分析仪的系统设计原理、记录模块的组成和电路的实现方法。该记录分析仪用于对舰船航行过程中的罗经航向、计程仪航速和GPS舰位等数据进行实时采集和记录,并依据采集数据辨识舰船运动模型参数,以便于操舵控制系统的设计与维修调试。     

分离式舵对潜艇横倾控制仿真分析

阐明分离式舵及差动舵角的定义,并以某型潜艇为例,分析了分离式舵对潜艇横倾的控制能力。并在此基础上编制了基于分离式舵的潜艇自动舵仿真模拟软件,通过仿真模拟对分离式舵与普通十字舵在潜艇高速回转时对横倾的控制能力进行了比较。     

船舵舵叶的水下焊接修补

文章介绍利用水下湿法焊接方法,成功对“Zim Israel”号远洋集装箱运输船舵叶上的裂纹进行修补的过程,可供同行参考.     

基于自航流场数值模拟的舵球节能流场分析

本文采用快速性数值模拟方法对加装舵球的36000吨散货船进行了节能评估。结果显示,加装舵球能起到一定的节能效果。之后本文对有、无舵球的两种方案的自航数值模拟流场进行了对比,分析获得了舵球节能的原理。本文模拟结果不仅可作为模型试验的有力补充,也可为舵球的优化设计提供重要参考。     

涂层对空化流动特性影响的实验研究

利用实验的方法研究了涂层对绕水翼空化流动特性的影响。分别针对喷涂环氧涂层和氟碳涂层的 Clark-Y 型水翼,采用高速摄像装置观察了不同空化阶段的空化流动形态。研究结果表明：（1）在初生空化阶段,当σ=1.82时,沿环氧涂层水翼表面展向排列着初生空泡,而氟碳涂层水翼还处于无空化状态,说明相对于环氧涂层,氟碳涂层对空化现象的产生有一定的抑制作用,氟碳涂层水翼初生空化数为1.50;（2）在片状附着型阶段,当σ小于1.63时,绕环氧涂层水翼的空化先于氟碳涂层水翼发展至片状空化,绕水翼空化流动产生大量分散空泡,沿水翼表面向后运动过程中逐渐长大,在高压区溃灭后形成小空泡并以马蹄涡形式继续运动。同一空化数下,绕环氧涂层水翼空化流动的空泡长度大于氟碳涂层水翼。但随空化数降低,两者空泡长度逐渐接近,说明环氧涂层在片状空化阶段对空化的抑制作用逐渐增强;（3）σ=0.87时空化发展至云状空化阶段,空化流动伴随周期性的云状空泡的脱落,绕环氧涂层水翼的空化流动周期及无量纲空化面积均小于氟碳涂层水翼,说明涂层对空化的非定常变化也有一定的抑制作用,且环氧涂层强于氟碳涂层。