京津城际铁路岔区板式无砟轨道结构设计

京津城际轨道交通在我国首次将板式无砟轨道成功应用于道岔区.介绍了岔区板式无砟轨道的结构组成、型式尺寸、技术特点及技术要求;对岔区板式无砟轨道进行了力学分析及配筋设计;简要阐述了岔区板式无砟轨道综合接地系统及过渡段设计处理措施.板式无砟轨道在京津城际轨道交通的成功应用,为我国岔区无砟轨道结构设计提供了新的技术方案.     

Determination of partial safety coefficients of structural reliability based on contaminated distribution

Partial safety factors must be evaluated precisely for the given target reliability index to ensure the certain level of structural reliability due to uncertain factors. The current studies of partial safety factors do not consider human error in construction for structural reliability. A mathematically model should be improved to simulate the partial safety coefficient concerned uncertainty factors which concern the effect of human error in construction. We employ the contaminated distribution to obtain the realistic mean value and standard variance of variable of structural parameters which coexist with random error human error. The reasonable partial safety coefficient can be calculated based on the realistic value of structural parameters concerned the effects of random error and gross error.     

人工神经网络理论在煤炭海运系统优化中的应用研究

本文应用人工神经网络方法，以经济指标为衡准，在考虑了航线的船型，港口装卸效率等因素后，对我国煤炭海运系统中的主要航线运量分配方案最优化进行讨论，为国家有关决策部门制订合理发展我国煤炭海运计划提供了理论依据。     

基于MATLAB的膨胀土胀缩等级评定模糊决策系统

膨胀土胀缩等级评定对于膨胀土工程至关重要.应用MATLAB工具箱中模糊决策系统对膨胀土胀缩等级进行判断,并在实际工程中得到应用,取得了较好的效果.     

汽车主动悬架系统的试验研究

在分析汽车传统被动悬架的基础上,给出了一种新型主动悬架结构。介绍了该主动悬架的工作原理,建立了二自由度的主动悬架数学模型。采用天棚控制策略,设计并研制了主动悬架样机及试验台架,进行了被动悬架与主动悬架的台架对比试验。试验结果表明,与被动悬架相比,该主动悬架能有效改善汽车的动态性能。     

新建跨线桥对高铁路基的附加影响及处治技术

通过三维有限差分数值模拟,分析新建公路跨线桥对既有高速铁路路基产生的附加影响(附加沉降和附加水平位移),并对抑制这些附加影响采取的处治技术及对附加影响起主要作用的因素进行研究.结果表明:数值模拟所得的附加沉降量与用0.025法确定压缩层厚度的理论公式计算的结果比较吻合;桥基荷载使路基下地基浅层产生趋向桥墩而地基深部产生远离桥墩的水平位移,处治的深度应大于附加水平位移的中性点;在桥基与路基之间的适当位置采用小直径钢管排桩加桩顶联系梁进行隔离处理时,当桩排数超过3或处理长度大于60 m后,对路基附加影响的抑制效果不再明显,但桩长深度的增加可以有效地抑制对路基的附加影响.     

Rollover detection and control on the non-driven axles of trucks based on pulsed braking excitation

The major challenges for rollover detection are the accurate modelling of vehicle dynamics and the real-time estimation of the varied parameters. To circumvent the dependence on vehicle parameters, a novel rollover detection method based on the pulsed braking excitation is proposed. With the lateral load transfer ratio (LTR), the relationship between rollover risks and non-driven wheel rotational dynamics is deduced, which is the basis to apply braking excitation on wheels. The lateral acceleration is adopted as the first criterion to activate the rollover detection. Once the pulsed braking is applied to the non-driven wheels, the braking pressure and wheel angular speeds are measured to estimate the LTR on the non-driven axle. In case of emergency, the differential braking-based anti-rollover is implemented. Experiments were conducted on a Hardware-in-Loop bench. The results show that, the pulsed braking can be activated timely, and the LTR on the non-driven axle is estimated accurately. With the anti-rollover control, the roll stability is improved considerably.     

新《公司法》与独立董事制度完善

2005年修改后的新《公司法》提出上市公司设立独立董事,标志着独立董事行使权力有法可依。本文研究了我国独立董事制度的产生和发展过程,阐述了我国股份公司中建立独立董事制度的必要性,并认为独立董事制度的完善不仅包括法律上的承认,还需要通过完善股东选举董事制度、强化独立董事职责、逐步完善董事会专门委员会制度以及建立独立董事协会,为独立董事制度的进一步发展创造条件。     

基于神经网络的汽车结构件低载强化特性确定

提出了一种基于径向基函数神经网络的汽车结构件低载强化特性确定方法。通过足够样本的训练,构造出一个有效的神经网络模型。对于给定的强化载荷和强化次数,应用构造的神经网络模型,可以确定相应的低载强化效果。经过对某汽车前梁和传动系齿轮低载强化特性的试验验证,证实了该神经网络可以准确快捷地预测不同强化载荷和强化次数下结构的强化效果。简化了计算过程,提高了计算精度,为基于低载强化的汽车产品轻量化设计带来了方便。