客车转向架抗侧滚扭杆装置特性分析

阐述了客车转向架安装抗侧滚扭杆装置的必要性 ,介绍了抗侧滚扭杆装置的结构和功能 ,建立了抗侧滚扭杆装置的力学模型 ,分析和计算了该装置对倾覆系数、柔度系数等性能参数的影响     

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。     

基于变结构控制理论的船舶非线性控制仿真研究

为厂提高船舶的航行安全性以及航行中的舒适性．设计了舵鳍联合减摇控制器。分析了船舶运动的非线性模型，根据实际情况进行假设，得到了船舶舵鳍联合减摇控制系统的状态方程，把非线性船舶鳍联合控制模型转化为可控正则型；将船舶运动模型看作是由横摇、艏摇、横荡3个子系统构成的大系统．进行了舵鳍联合控制，设计了分散变结构控制器，最后针对这类控制器进行了MATLAB仿真研究。仿真结果表明：舵鳍联合控制器能够很好的抑制船舶的横摇和艏摇，并能尽可能大的减小横荡。     

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.     

Application of observer-based fault detection in vehicle roll control

This paper describes how observer-based techniques for intelligent fault detection were applied to monitoring an active suspension control system in an experimental articulated heavy vehicle. The aim was to define a practical method for detecting faults, taking into account the nonlinearities of the vehicle. The experimental vehicle was divided conceptually into subsystems, namely the passive dynamics of the trailer, the dynamics of the hydraulic actuators, and the expected response of the closed-loop system. A linear dynamic model was designed for each subsystem. A fault detection observer was then designed for each dynamic model. The observer feedback gains were chosen to optimise estimation by the observer residual of specified errors on the output measurements. The observer residuals were then normalised and combined logically to provide a fault diagnosis. The performance of the fault detection scheme is demonstrated in the case of sensor faults and changes in the operation of the active control system.     

盘形滚刀刀圈轧制数值模拟研究

盘形滚刀工况条件差、换刀成本高,生产厂家对刀圈的性能要求越来越严格。为了提高刀圈质量,针对TBM中43.2 cm(17英寸)盘形滚刀刀圈,采用轧制成形工艺,运用塑性成形软件,建立盘形滚刀轧制过程数值模型,通过有限元仿真分析滚刀成形的应力场和应变场,并对不同参数对成形过程的影响进行研究。研究结果表明:1)轧制过程应力较小,应变分布较为均匀,但整体应变较小,随着主辊转速及芯辊进给速度的增大,等效应力逐渐减小,应变基本不变。2)匹配仿真参数进行刀圈轧制试验,并对刀圈质量进行检测,刀圈流线与外形轮廓相符,分布连贯不被打断,且与主应力方向一致,流线合理。     

Efficient estimation of extreme non-linear roll motions using the first-order reliability method (FORM)

In on-board decision support systems, efficient procedures are needed for real-time estimation of the maximum ship responses to be expected within the next few hours, given online information on the sea state and user-defined ranges of possible headings and speeds. For linear responses, standard frequency domain methods can be applied. For non-linear responses, as exhibited by the roll motion, standard methods such as direct time domain simulations are not feasible due to the required computational time. However, the statistical distribution of non-linear ship responses can be estimated very accurately using the first-order reliability method (FORM), which is well known from structural reliability problems. To illustrate the proposed procedure, the roll motion was modelled by a simplified non-linear procedure taking into account non-linear hydrodynamic damping, time-varying restoring and wave excitation moments, and the heave acceleration. Resonance excitation, parametric roll, and forced roll were all included in the model, albeit with some simplifications. The result is the mean out-crossing rate of the roll angle together with the most probable wave scenarios (critical wave episodes), leading to user-specified specific maximum roll angles. The procedure is computationally very effective and can thus be applied to real-time determination of ship-specific combinations of heading and speed to be avoided in the actual sea state.     

猎雷声纳基阵姿态的稳定与控制

舰壳安装的猎雷声纳需要通过稳定系统隔离舰船的摇摆,以保持姿态的稳定,为发射和接收声纳信号提供稳定的平台.文章介绍了一种用三轴支撑基阵的运动补偿式无平台稳定机构,由导航系统测得的舰船摇摆角经计算,分解到基阵的转动轴上,再分别由伺服系统控制三轴转动,从而消除舰船摇摆的影响,达到稳定基阵姿态的目的.     

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。     

扭曲舵强制自航舵力测量试验研究

在拖曳水池中进行了自航约束模舵力测量试验,对扭曲舵和普通舵的舵力进行了测量,比较分析了扭曲舵和普通舵的舵力特性。试验结果表明,在0°舵角时,扭曲舵上的受力状态得到明显改善,对舰船的直航性和舵机受力是有利的。在通过打舵使舰船发生回转时,扭曲舵不仅能使舵轴上的受力状态得到改善,而且能够提高舵的操纵力,改善舰船的回转性能。