辛泰线危岩落石整治

针对辛泰线危石、落石实际情况,结合《铁路路基设计规范》等相关规范、规则对产生危石、落石的原因进行分析并提出相应的综合整治措施。     

Enhancing grey prediction fuzzy controller for active suspension systems

A grey prediction fuzzy controller (GPFC) was proposed to control an active suspension system and evaluate its control performance. The GPFC employed the grey prediction algorithm to predict the position output error of the sprung mass and the error change as input variables of the traditional fuzzy controller (TFC) in controlling the suspension system to suppress the vibration and the acceleration amplitudes of the sprung mass for improving the ride comfort of the TFC used; however, the TFC or GPFC was employed to control the suspension system, resulting in a large tire deflection so that the road-holding ability in the vehicle becomes worse than with the original passive control strategy. To overcome the problem, this work developed an enhancing grey prediction fuzzy controller (EGPFC) that not only had the original GPFC property but also introduced the tire dynamic effect into the controller design, also using the grey prediction algorithm to predict the next tire deflection error and the error change as input variables of another TFC, to control the suspension system for enhancing the road-holding capability of the vehicle. The EGPFC has better control performances in suppressing the vibration and the acceleration amplitudes of the sprung mass to improve the ride quality and in reducing the tire deflection to enhance the road-holding ability of the vehicle, than both TFC and GPFC, as confirmed by experimental results.     

Fault classification method for the driving safety of electrified vehicles

A fault classification method is proposed which has been applied to an electric vehicle. Potential faults in the different subsystems that can affect the vehicle directional stability were collected in a failure mode and effect analysis. Similar driveline faults were grouped together if they resembled each other with respect to their influence on the vehicle dynamic behaviour. The faults were physically modelled in a simulation environment before they were induced in a detailed vehicle model under normal driving conditions. A special focus was placed on faults in the driveline of electric vehicles employing in-wheel motors of the permanent magnet type. Several failures caused by mechanical and other faults were analysed as well. The fault classification method consists of a controllability ranking developed according to the functional safety standard ISO 26262. The controllability of a fault was determined with three parameters covering the influence of the longitudinal, lateral and yaw motion of the vehicle. The simulation results were analysed and the faults were classified according to their controllability using the proposed method. It was shown that the controllability decreased specifically with increasing lateral acceleration and increasing speed. The results for the electric driveline faults show that this trend cannot be generalised for all the faults, as the controllability deteriorated for some faults during manoeuvres with low lateral acceleration and low speed. The proposed method is generic and can be applied to various other types of road vehicles and faults.     

基于群组行为的大学校园楼梯及通道行人运动特征分析

为探讨不同场景中行人群组运动的微观特征,并比较不同类型群组运动差异,本文通过大学校园内楼梯上及通道内的观测实验,获取行人运动的相关数据,研究了群组大小、社会关系、运动场景和性别对群组运动的影响. 结果表明：大学校园内行人成组比例低于商场周围行人成组比例;群组成员间的交流方式等因素会影响群组构型;由于群组成员越多相互协调就越困难,所以群组规模越大,其速度越小;此外,男性群组速度大于女性群组速度,情侣间频繁的交流也会对其速度产生负面影响;就差异性而言,2 人和3 人群组间的速度差异小于单人和2 人群组间的速度差异;单个行人不同性别间的速度差异大于2 人和3 人群组不同性别间的速度差异;楼梯上单人与群组的速度差异没有通道内明显.     

Analysis of single pipeline pull-in procedure using small scale models

The structural elastic behaviour of steel pipelines during on-bottom pull-in procedure is investigated experimentally by using small scale models. Despite the lack of a sea-bed soil pipeline interaction effect in the model, it is possible to show that the unevenness of the sea-bed surface and the non-uniform distribution of friction forces can lead to large deflection bending stresses, higher than the numerical results yielded by standard software packages commonly used for design calculations. Due to foreseen difficulties in overcoming the drawbacks in practical and numerical procedures, the off-bottom pull-in operation arises as an attractive alternative even for shallow waters.     

基于余度概念的受损船体总纵剩余强度预报

基于作者提出的结构余度概率衡准，并通过对船体构件损伤模型与船体总纵强度可靠性计算模型的讨论，本文建立了一个合理而筒便的受损船体总纵剩余强度预报方法。     

带纵骨实肋板式耐压液舱壳板强度计算方法研究

本文把耐压液舱结构看成一弹性整体，先对其进行整体求解，然后再对耐压液舱壳板按具有初始膜应力的混合边界问题求解。结果表明：在弹性范围内，本文方法计算值与有限元计算值及实验值吻合较好；在弹塑性范围内，本文对耐压液舱壳板边界约束的处理比文献「１」方法更符合弹塑性状态时其边界约束的真实状况。     

中厚度扁球壳大挠度分析的新模型

本文探讨横向剪切在壳体响应中的作用。基于Ｒｅｉｓｓｎｅｒ－Ｍｉｎｄｌｉｎ横向剪切应变非零的假设，导出扁球壳完整的非线性几何方程，引入平均转角的概念。建立了扁球壳进行大挠度分析的一种新模型，该模型适用于扁薄球壳到中厚度扁球壳，其控制方程仅含４个未知量。工程算例及实验研究表明该模型具有很好的精度高。     

高温球阀密封座损坏原因分析及解决方法

介绍了高温球阀使用中所出现的密封座损坏现象,分析了发生的原因,提出了其解决方法,并说明了改进后的效果.     

航道整治滩性分析——非冲积性滩险滩性分析

论述了非冲积性滩险类型、基本成因、滩险碍航特点、水流特性及其分析方法。通过滩性分析可以确定滩险成滩水位、最凶水位、消滩水位(流量)的成滩出现时期及滩段凶、险的定量概念。结合滩段地貌、地形特点,确定碍航水流具体成因,并据以制定整治原则和方法。