用GPS定位系统控制车体倾摆

阐述了使用车载数据库,将GPS和曲率测定相结合来精确测定列车位置的方法.运行试验证实,这种系统的定位误差小于4 m.     

Dynamic modelling and experimental validation of three wheeled tilting vehicles

The present paper describes the study of the stability in the straight running of a three-wheeled tilting vehicle for urban and sub-urban mobility. The analysis was carried out by developing a multibody model in the Matlab/SimulinkSimMechanics environment. An Adams-Motorcycle model and an equivalent analytical model were developed for the cross-validation and for highlighting the similarities with the lateral dynamics of motorcycles. Field tests were carried out to validate the model and identify some critical parameters, such as the damping on the steering system. The stability analysis demonstrates that the lateral dynamic motions are characterised by vibration modes that are similar to that of a motorcycle. Additionally, it shows that the wobble mode is significantly affected by the castor trail, whereas it is only slightly affected by the dynamics of the front suspension. For the present case study, the frame compliance also has no influence on the weave and wobble.     

经过海峡的双层流体由底部波动产生的斜向波散射问题研究(英文)

The problem of oblique wave(internal wave) propagation over a small deformation in a channel flow consisting of two layers was considered.The upper fluid was assumed to be bounded above by a rigid lid,which is an approximation for the free surface,and the lower one was bounded below by an impermeable bottom surface having a small deformation;the channel was unbounded in the horizontal directions.Assuming irrotational motion,the perturbation technique was employed to calculate the first-order corrections of the velocity potential in the two fluids by using Green’s integral theorem suitably with the introduction of appropriate Green’s functions.Those functions help in calculating the reflection and transmission coefficients in terms of integrals involving the shape function representing the bottom deformation.Three-dimensional linear water wave theory was utilized for formulating the relevant boundary value problem.Two special examples of bottom deformation were considered to validate the results.Consideration of a patch of sinusoidal ripples(having the same wave number) shows that the reflection coefficient is an oscillatory function of the ratio of twice the x-component of the wave number to the ripple wave number.When this ratio approaches one,the theory predicts a resonant interaction between the bed and the interface,and the reflection coefficient becomes a multiple of the number of ripples.High reflection of incident wave energy occurs if this number is large.Similar results were observed for a patch of sinusoidal ripples having different wave numbers.It was also observed that for small angles of incidence,the reflected energy is greater compared to other angles of incidence up to.These theoretical observations are supported by graphical results.     

基于单轴陀螺平台的摆式列车倾摆检测系统

提出了基于单纯陀螺平台的摆式列车检测系统，详细分析了单纯陀螺平台系统的工作原理有其在摆式列车检测中的应用。对平台系统进行的分析表明，陀螺仪的漂移和国速度计的零偏是影响平台系统工作精度的主要误差因素。     

我国摆式列车发展模式的探讨

简要介绍了我国发展摆式列车的背景；从倾摆机构、作动器类型、线路信息检测方式、牵引方式和转向架等方面对国外摆式列车发展模式进行了探讨；结合路情，提出了我国发展摆式列车的模式。     

摆式列车车休倾摆机构同步问题研究

针对倾摆机构和作动器因安装空间位置受限制以及为保证互换性而采取相对安装的方式带来的车体倾摆机构的同步问题,分析了摆式列车车体倾摆角度与作动器行程的关系,提出作动器主从同步的控制方式,即以一个作动器的输出作为理想输出,其余的作动器受控跟踪这一选定的理想输出,达到同步控制。这种同步控制方式具有灵活、快速、准确的输出响应,并通过试验得到了验证。     

车端联接装置对摆式列车横向动力学的影响

从摆式列车的特殊结构出发,建立了车端联接装置的等效模型。利用2M2T摆式动车组统一模型进行其横向动力学的计算机仿真分析,明确了车端联接装置的刚度值对摆式动车组动力学性能的影响,并预测了摆式列车组的动态曲线通过性能。     

可倾瓦推力轴承润滑油膜静动特性 计算的嵌套式二分法与应用

在舰船推进轴系纵向振动特性分析中,可倾瓦推力轴承润滑油膜的动特性是轴系力传递和振动响应分析的重要环节。该文建立了润滑油膜特性分析的理论模型,以有限差分法为基础,提出了嵌套式二分法,数值求解了油膜静动特性,并分别得出了在轴系载荷与转速独立和非独立的情况下,油膜动特性随转速的关系。解释了船舶推进轴系振动实验中,不同转速情况下,相应的频响函数幅值大小的变化规律。     

Kinematic and Kinetic Analysis for the Tilting Mechanism of Railway Passenger Cars

The kinematics and kinetics of the tilting mechanism of railway passenger cars are studied. The parameters of the mechanism are given. The motions of the actuator, the center of gravity of the carbody and the center of coupler are calculated. Finally, the maximum driving force, output power and velocity of the actuator are discussed in detail.     

我国摆式列车铁路设施的配套措施

根据我国山区铁路、一般双线铁路和繁忙双线铁路３种类型的铁路现况和提速目标值,提出用摆式列车提速时对机车车辆、线路和信号系统的各种配套措施,在投资少的条件下实现安全、可靠、舒适的提速目标。