CFD理论黏性流场中三维振动水翼的非定常水动力性能(英文)

The motion of the fins and control surfaces of underwater vehicles in a fluid is an interesting and challenging research subject. Typically the effect of fin oscillations on the fluid flow around such a body is highly unsteady, generating vortices and requiring detailed analysis of fluid-structure interactions. An understanding of the complexities of such flows is of interest to engineers developing vehicles capable of high dynamic performance in their propulsion and maneuvering. In the present study, a CFD based RANS simulation of a 3-D fin body moving in a viscous fluid was developed. It investigated hydrodynamic performance by evaluating the hydrodynamic coefficients (lift, drag and moment) at two different oscillating frequencies. A parametric analysis of the factors that affect the hydrodynamic performance of the fin body was done, along with a comparison of results from experiments. The results of the simulation were found in close agreement with experimental results and this validated the simulation as an effective tool for evaluation of the unsteady hydrodynamic coefficients of 3-D fins. This work can be further be used for analysis of the stability and maneuverability of fin actuated underwater vehicles.     

后鳍机构强度分析及应力对比分析

本文介绍了小水线面双体船后鳍机构的组成及主要设计输入,采用经典算法计算了鳍轴在正常工作时的应力,采用有限元分析法计算了鳍柄的应力,并将此应力与航行试验时通过应变片实测的应力进行对比。对比结果表明,两者误差百分比约为4%,在工程许可的误差范围内。     

低水头枢纽仿生态鱼道水流条件研究

采用正态1:20整体物理模型为主要研究手段,对低水头枢纽仿生态鱼道进行水力学试验研究。首先通过分析国内鱼道主要过鱼对象,确定了适合国内鱼道的设计流速,而后通过整体物理模型重点研究了枢纽上、下游不同水位差情况下,鱼道内沿程水位、比降及流速等水力要素变化,并对试验结果进行分析,逐步优化了鱼道进鱼口结构型式、鱼道底板高程、鱼道总长度、竖缝宽度及池室个数,得出了适合国内鱼类的低水头航电枢纽仿生态鱼道平面布置方案。     

SWATH船运动中断分析和减横摇控制器设计

针对SWATH船实航时产生的水平筛动问题,研究由横荡、横摇和艏摇的耦合运动产生的船舶运动中断(MII),提出设计SWATH船稳定鳍减横摇控制器,减小MII。通过理论分析MII产生原因和SWATH船稳定鳍工作时产生减摇作用的力和力矩特性,验证利用稳定鳍减小SWATH船横摇运动,抑制MII的可行性。在保证SWATH船升沉和纵摇运动的基础上,设计稳定鳍减横摇控制器,减小SWATH船横摇。仿真结果表明,控制器使SWATH具有良好的纵向运动性能,有效减小了横摇运动,抑制MII。     

一种翼滑艇和滑行艇新型尾鳍研究

介绍新型尾鳍的结构特征并建立减纵摇和减横摇的水动力模型,建立滑行艇和翼滑艇在正横规则波和迎浪条件下的运动微分方程,并利用ЦАГИ法对艇体阻力进行计算。基于Matlab/Simulink建立滑行艇和翼滑艇运动及尾鳍减摇综合仿真模型,并进行仿真计算。算例结果表明,该新型尾鳍控制简单,能够极大地提高滑行艇和翼滑艇航行的动稳性。     

基于直接转矩控制的减摇鳍电伺服系统仿真研究

本文介绍了基于异步电动机直接转矩控制的减摇鳍电伺服系统基本结构和原理；并根据其控制原理，借助MATLAB6．5／Simulink5．0软件对该电伺服系统进行了建模和仿真，提出了一种按照海浪波倾角控制的计算方法；最后给出了仿真结果及分析。与传统的减摇鳍伺服系统相比，该伺服系统具有结构简单、制造和维护成本低、无变参数问题以及易于实现数字化等优点，并且具有良好的减摇效果。仿真结果验证了该伺服系统的正确性和有效性。     

Research on the influence of action between fin and anti-rolling tank on the integrated stabilization effect

Through analyzing the roll model of the integrated system of fin and anti-rolling tank, this paper uses binomial equation to simplify the module and check how the approximate parameters simulate the original function. Based on the simplified module, the influence of fin and anti-rolling tank on the coefficient items of the roll module is discussed, and the influencing factors between fin and anti-rolling tank are analysed. And through simulation, the influence of action between fin and anti-rolling tank on the static characteristics, and the integrated stabilization effect, are analyzed.     

基于MATLAB、C++、Vega的减摇鳍控制系统的视觉仿真

针对船舶减鳍系统,运用PID控制理论设计了控制器,利用MATLAB模拟了随机海浪和鳍相互作用对船舶的影响,将C 作为中间环节,实现了MATLAB与Vega之间的数据传输,从而实现了减摇仿真的视觉效果。经仿真试验表明,该仿真系统的结果是令人满意的。     

Design of Fin-propeller Test Set-up and Analysis of Roll Stabilization Ability

Presents the fin-propeller test set-up to solve the problem of roll stabilization with ships in full speed range, withwhich, tests were run in water rank for acquisition of data, and concludes from data acquired that the fin-propeller test set-up produces more lift than simple fin, and provides lateral thrust as well, and it is therefore an effective roll stabilization devicefor ships in full speed range.     

特种减摇装置的升力模型优化

减摇鳍是一种特种减摇装置,它在船舶减摇装置中占有重要地位,本文首先对低航速减摇鳍在水中运动所受的作用力进行分析。其次,利用计算流体力学仿真软件Fluent对减摇鳍在低航速状况下进行仿真分析,并利用Matlab拟合出低航速减摇鳍的动态升力模型。最后,对拟合出的动态升力公式进行验证。结果分析表明:拟合出的动态升力公式可以很好的反应减摇鳍在低航速海况下进行主动拍击过程所产生的升力,可以为舰船在低航速海况下设计减摇控制系统提供一定的参考。