全文获取类型
| 收费全文 | 99篇 |
| 免费 | 7篇 |
专业分类
| 公路运输 | 22篇 |
| 综合类 | 19篇 |
| 铁路运输 | 65篇 |
出版年
| 2024年 | 2篇 |
| 2023年 | 1篇 |
| 2021年 | 3篇 |
| 2020年 | 6篇 |
| 2019年 | 1篇 |
| 2018年 | 3篇 |
| 2017年 | 3篇 |
| 2016年 | 3篇 |
| 2015年 | 4篇 |
| 2014年 | 6篇 |
| 2013年 | 4篇 |
| 2012年 | 20篇 |
| 2011年 | 7篇 |
| 2010年 | 3篇 |
| 2009年 | 1篇 |
| 2008年 | 5篇 |
| 2007年 | 6篇 |
| 2006年 | 11篇 |
| 2005年 | 3篇 |
| 2004年 | 4篇 |
| 2003年 | 1篇 |
| 2002年 | 2篇 |
| 2001年 | 3篇 |
| 2000年 | 1篇 |
| 1999年 | 1篇 |
| 1994年 | 1篇 |
| 1990年 | 1篇 |
排序方式： 共有106条查询结果，搜索用时 15 毫秒
61.
62.
63.
基于高速列车-桥梁时变系统空间振动分析模型,采用弹性系统动力学总势能不变值原理及形成系统矩阵的“对号入座”法则,建立此系统空间振动方程。运用列车脱轨能量随机分析理论,对天兴洲公铁分建40 m简支梁桥客运线上高速列车在设计车速以内是否脱轨及在不脱轨条件下高速列车走行舒适性进行分析。研究结果表明:该桥上高速列车在300km/h车速以内运行时不会脱轨;高速列车走行舒适性均在良好标准以上;该桥竖向振动加速度满足要求。 相似文献
64.
双块式无碴轨道高速列车脱轨控制分析 总被引：1，自引：0，他引：1
针对双块式无碴轨道结构特点,提出一种新的双块式无碴轨道空间振动分析模型,进一步建立高速列车一双块式无碴轨道系统空间振动分析方法。然后,基于列车脱轨能量随机分析理论,对高速列车-双块式无碴轨道系统横向振动稳定性及高速列车是否脱轨进行了评判。计算结果表明：高速列车以300km／h速度在双块式无碴轨道上运行时,车轨系统横向振动是稳定的,列车不会脱轨,且具有n=2．143的抗脱轨安全系数。 相似文献
65.
Tao Zhu Bao-zhu Yang Chao Yang Shou-ne Xiao Guang-wu Yang Bin Yang 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2018,56(9):1375-1393
A mechanical model of the coupler and draft gear was established to study the mechanism during an intercity train collision. The model includes four rigid bodies, one spherical joint, two nonlinear torsion spring units and two nonlinear hysteresis units. Simulation and test results show that the axial characteristics of the model are reasonable and the model can reasonably simulate the pitching movement of the coupler. The influence of the coupler and draft gear on the collision behaviour of the train is analysed considering a four-section intercity train. The results show that during the collision process, the amount of compression of the middle coupler is an important factor influencing the pitching deflection angle. The pitching motion posture of the coupler changes with the initial pitching deflection angle, but the initial pitching deflection angle has little effect on its yawing deflection angle. When the pitching angle of the middle coupler is elevated, as the elevation angle increases, the derailment risk of the ‘A’ end bogie of the previous vehicle increases, whereas the risk of derailment of the ‘B’ end bogie of the subsequent vehicle decreases. When the pitching angle of the middle coupler is depressed, the derailment trends for the front and rear bogies exhibit the opposite trend from that of the elevation angle. As the train collision speed increases, the pitching motion of the middle coupler is limited to forcing a yawing motion, causing the yawing deflection angle to increase sharply, which causes the wheel–rail lateral force to increase rapidly. From this, the derailment risk of the bogie increases, which further causes large displacement lateral buckling of the train. An anti-lateral buckling device can limit the yawing deflection angle of the middle coupler, preventing lateral buckling from large displacement and decreasing the risk of derailment. 相似文献
66.
Lirong Guo Jianhui Lin Bing Zhang Zaigang Chen Xinwu Song 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2016,54(7):943-962
Prevention of train from derailment is the most important issue for the railway system. Keeping derailed vehicle close to the track centreline is beneficial to minimise the severe consequences associated with derailments. In this paper, the post-derailment safety measures are studied based on low-speed derailment tests. Post-derailment devices can prevent deviation of the train from the rail by catching the rail, and they are mounted under the axle box. Considering the different structures of vehicles, both trailer and motor vehicles are equipped with the safety device and then separately used in low-speed derailment tests. In derailment tests, two kinds of track, namely the CRTS-I slab ballastless track and the CRTS-II bi-block sleeper ballastless track, are adopted to investigate the effect of the track types on the derailment. In addition, the derailment speed and the weight of the derailed vehicle are also taken into account in derailment tests. The test results indicate that the post-derailment movement of the vehicle includes running and bounce. Reducing the derailment speed and increasing the weight of the head of the train are helpful to reduce the possibility for derailments. For the CRTS-I slab ballastless track, the safety device can prevent trailer vehicles from deviating from the track centreline. The gearbox plays an important role in controlling the lateral displacement of motor vehicle after a derailment while the safety device contributes less to keep derailed motor vehicles on the track centreline. The lateral distance between the safety device and rails should be larger than 181.5?mm for protecting the fasteners system. And for the CRTS-II bi-block sleeper ballastless track, it helps to decrease the post-derailment distance due to the longitudinal impacts with sleepers. It can also restrict the lateral movement of derailed vehicle due to the high shoulders. The results suggest that, CRTS-II bi-block sleeper ballastless track should be widely used in derailment prone areas. 相似文献
67.
铁路货车脱轨安全性研究 总被引：2，自引：1，他引：1
C62货车是中国的主型货车, 对其进行脱轨安全性研究对确保铁路安全生产有十分重要的意义。利用机车车辆系统动态仿真软件, 建立C62货车的动力学计算模型, 分析该车在直线上的蛇行运动稳定性及曲线上的通过性能, 并着重分析了C62货车装载不合理对行车安全的影响。 相似文献
68.
随着列车提速和高速化发展,列车运行安全性和可靠性保障要求愈发受到关注和重视。尽管列车具有一系列主动安全保障措施,但如果发生意外碰撞脱轨事故,将造成灾难性后果和巨大经济损失。为进一步揭示列车碰撞脱轨机理、提升列车碰撞被动安全性能,建立包含车体、转向架、悬挂系统及缓冲吸能装置的三编组列车碰撞有限元模型,考虑材料、几何和接触等典型的碰撞动力学非线性特征,仿真模拟正面斜碰刚性墙引起的车体结构动态响应与列车脱轨行为,讨论列车碰撞速度(36,50和72 km/h)、碰撞角度(30°～65°)和轮轨摩擦因数(0.1,0.2,0.3,0.4)等关键参量对列车碰撞脱轨行为的影响规律与机理。研究结果表明,车体头部界面碰撞力通过悬挂系统传递至轮对,引起轮轨纵向、横向和垂向接触力剧烈振荡,导致头车前、后转向架轮对均以爬轨/侧滚组合的形式脱离轨道,且轮轨横向力随着列车碰撞速度的增大显著增加;头车碰撞界面横向力随着碰撞角度的增大呈现先增大后减小的趋势,而纵向及垂向界面碰撞力均随着碰撞角度的增大而增大;较高的轮轨摩擦因数容易引起列车碰撞过程中车轮跳轨,但会抑制车轮爬轨行为。研究结果可为列车碰撞被动安全设计与脱轨防护提供理论和技术支持。 相似文献
69.
宁永芳;高广军 《铁道科学与工程学报》2014,11(2):121-124
基于矿山采用传统运人设备,运输效率低的缺点,设计一种轨距为600 mm的载人轨道车,转向架采用U型构架,车辆采用二系悬挂,摇枕能够绕回旋中心转动使车辆能够通过小半径曲线。车体采用低地板设计,转向架支撑车体部位上凹以便于转向架的安装。车辆中心高度为486 mm。动力学仿真结果表明：在直线上运行速度为45 km/h时,该车辆具有优异的动力学性能,能够安全通过半径为50 m的小半径曲线。 相似文献
70.
介绍了澳大利亚于2009年颁布的AS7509.1《铁路机车车辆—动力学性能—第1部分：机车车辆》中机车车辆在扭曲测试轨上脱轨安全性测量方法,在SIMPACK软件中模拟AS7509.1标准中的实验扭曲轨道条件,进行车辆脱轨安全性计算方法。与欧洲在2005年颁布的BSEN14363《铁路设施—铁路车辆运行特性的验收试验—运行性能试验和稳定性试验》中计算机仿真评价机车车辆低速抗爬轨能力方法进行比较分析得出,AS7509.1标准比BSEN14363标准验证车辆适应轨道扭曲能力的计算方法更可靠,适用性更广。 相似文献