着速和着角对水雷入水过载影响的数值仿真分析

为了研究高速水雷入水时受到的过载情况,采用流固耦合仿真软件MSC-Dytran,对水雷击水问题进行数值模拟仿真研究。分别计算了不同入水情况下雷体指定部位的加速度响应随时间的变化。仿真结果表明水,雷冲击载荷随入水速度的增大而迅速增大,入水速度是水雷受到的冲击载荷大小的主要影响因素。对新型水雷的结构设计、引信的设计、水雷装药的安全性设计以及其他元器件的抗冲击设计提供有价值参考。     

船舶舵机的营运检验

船舶舵机对于船舶安全航行非常重要,在船舶的营运检验中,对船舶舵机的检验是船舶验船师在检验过程中一项重要工作,本文希望通过对船舶舵机技术规范的介绍以及船舶舵机容易出现的故障分析和对船舶舵机进行营运检验的重点的论述,能够给验船人员在进行舵机检验工作时起到抛砖引玉的作用。     

大型浮吊船体全回转起吊作业的稳性研究

基于对某超大型海上起重浮吊船体在静水和波浪中的完整稳性的计算分析,研究了在不同浪向角下全回转起吊作业的完整稳性,探讨了波浪对静稳性力臂GZ曲线、横摇纵倾及初稳性高度等稳性要素的影响,并提出衡量大型浮吊船体在波浪中稳性的几点建议.     

船首形状对舷侧结构碰撞性能的影响研究

船舶碰撞问题一直是船舶力学界研究的热点,但以往的研究并没有深入分析各类船舶的不同艏部形状对碰撞性能所产生的影响.为此利用数值仿真软件MSC/Dytran,对具有不同曲率的球鼻型船首和不同张角的常规船首撞击下舷侧结构的碰撞性能进行了定量的比较研究.结果表明,撞击船首部形状对被撞船舷侧结构的碰撞性能产生显著的影响,撞击船球鼻曲率形状参数越小或艏部张角越大,舷侧结构极限撞深提高,碰撞力增大,极限撞深时的吸能增多.     

带外伸横梁的钢箱梁桥横梁计算有效分布宽度研究

为解决带外伸横梁的钢箱梁桥横梁计算有效分布宽度问题,借助无限长板带对位荷载下的应力分布研究结果,导出了不同桥宽和不同宽度外伸横梁对应的有效分布宽度扩散角;然后分别采用板壳有限元模型和梁单元模型对实际工程中超宽桥梁外伸横梁受力进行对比分析,以验证导出的有效分布宽度扩散角的实用性和有效性。结果表明：采用导出的有效分布宽度扩散角的梁单元模型计算结果与板壳有限元模型计算结果非常接近,且能够包络板壳有限元模型的计算结果,是偏于安全的。     

橡胶颗粒改良膨胀土路基的三轴应力试验研究

为探究橡胶颗粒改良膨胀土路基的抗剪切性能,以南京市江宁区某地的弱-中等膨胀土为试验对象,在不同橡胶掺量和各级围压下进行三轴固结不排水（CU）试验。试验结果表明：随着橡胶掺入量的上升,土体黏聚力呈持续下降趋势,内摩擦角先增大,在10%橡胶掺量时几乎维持不变,而后减小;土体抗剪强度在橡胶掺入量为5%时取得最大值。在掺胶率大于10%时,改良土黏聚力和抗剪强度大幅下降,在应用到膨胀土改良工程时,需要有所考虑。     

63kN·m船舶液压舵机的改造研究

文章针对现有63kN·m液压舵机的不足加以研究与改造，应用可编程控制器（PLC）和同轴流量放大器实现由人工舵改造为自动舵，建立PID自动舵动态模型，研究仿真结果，表明改造后液压舵机完全满足船舶航向控制要求。     

Implementation of active steering on longer combination vehicles for enhanced lateral performance

A steering-based controller for improving lateral performance of longer combination vehicles (LCVs) is proposed. The controller steers the axles of the towed units to regulate the time span between the driver steering and generation of tyre lateral forces at the towed units and consequently reduces the yaw rate rearward amplification (RWA) and offtracking. The open-loop effectiveness of the controller is evaluated with simulations and its closed loop or driver in the loop effectiveness is verified on a test track with a truck–dolly–semitrailer test vehicle in a series of single- and double-lane change manoeuvres. The developed controller reduces the yaw rate RWA and offtracking considerably without diminishing the manoeuvrability. Furthermore, as a byproduct, it decreases the lateral acceleration RWA moderately. The obtained safety improvements by the proposed controller can promote the use of LCVs in traffic which will result in the reduction of congestion problem as well as environmental and economic benefits.     

大跨度半刚性站台雨棚结构设计与分析

以长春站无站台柱雨棚为工程背景,对大跨度半刚性站台雨棚的结构选型、整体计算及非线性分析进行介绍,提出拉索与雨棚柱的合理夹角、拉索的初始力是该类半刚性风雨棚设计的关键,并应用SAP2000有限元软件进行数值对比分析,得出合理夹角范围及初始力。     

Objectification of steering feel around straight-line driving for vehicle/tyre design

This paper presents the objectification techniques for the assessment of steering feel including {on-centre} feel and steering response by measurement data. Here, new objective parameters are developed by considering not only the process by which the steering feel is evaluated subjectively but also by the ergonomic perceptive sensitivity of the driver. In order to validate such objective parameters, subjective tests are carried out by professional drivers. Objective measurements are also performed for several cars at a proving ground. The linear correlation coefficients between the subjective ratings and the objective parameters are calculated. As one of new objective parameters, steering wheel angle defined by ergonomic perception sensitivity shows high correlation with the subjective questionnaires of on-center responses. Newly defined steering torque curvature also shows high correlation with the subjective questionnaires of on-center effort. These correlation results conclude that the subjective assessment of steering feel can be successfully explained and objectified by means of the suggested objective parameters.