Dynamic modelling of a two-wheeled vehicle: Jourdain formalism

This paper presents a motorcycle direct dynamic formulation by the Jourdain's principle approach. This vehicle is considered as an assembly of six rigid bodies and the resulting equation of motion allows to simulate 11 degrees of freedom. The vehicle geometry is described and a step-by-step procedure is introduced to evaluate the kinematics and the generalised efforts of the considered vehicle. In addition, to simulate the equation of motion, a Lyapunov-based stabilisation is developed to assess the vehicle behaviour in response to a propulsion/braking torque applied on the vehicle's wheels and a rider torque exerted on the motorcycle's handlebar. Simulation results reveal some dynamic features such as load transfer and counter-steering phenomena.     

"天梭"号电力机车垂向动力作用分析

针对“天梭”号交流传动电力机车采用轮盘制动的转向架架承式悬挂方案簧下质量大的缺陷，运用机车车辆-轨道垂向动力作用仿真分析软件(VICT)进行了垂向动力作用分析，并与同等速度等级的既有机车垂向动力作用性能进行了对比分析，评估了该方案设计的合理性和可行性。     

一种共轨式电控高压供油泵凸轮型线的设计

运用机械动力学的原理建立了凸轮机构动力学模型和振动方程 ,通过预先给定一个期望的柱塞运动规律 ,进行凸轮机构动力学设计 ,然后反求凸轮廓线 ,得到凸轮型线设计所需要的数据 ,并通过实例设计出一种多项式动力凸轮。     

船体非线性波浪载荷的水弹性分析

本文采用水弹性分析方法研究船舶在规则波及不规则波中迎浪航行时的结构动力响应（运动、剪力和弯矩等）。确定流体载荷时应用了扩展的切片理论，其中计及由于船体的非直舷、剖面吃水的瞬时变化和船体振荡的非简谐特性所导致的非线性，同时还考虑了波浪冲击、出水和上浪的影响。运动方程是在时域内步进求解。数值计算结果与规则波中的模型试验相比较，符合程度令人满意。     

二系悬挂对机车动力学性能的影响

以SS7E型机车为研究对象,分析研究了二系悬挂结构设计、参数选择等对改善机车运行性能的影响。     

SS7B与SS7C型电力机车的动力学性能试验研究

通过对在同一条线路上，结构基本相同但轴重不同，悬挂参数也进行了优化的两台ＳＳ７型电力机车进行的动力学性能试验，研究了轴重和悬持参数对机车动力学性能的影响，得到了有价值的结论，为机车的设计提供了重要的参考资料。     

有限长双层壳体声辐射理论及数值分析

研究流场中有限长加筋双层圆柱壳受径向点激励的振动和声辐射性能。壳体的振动用Fluegge壳体方程描述，将加强构件等价为对内外壳体的支持力，采用Helmholtz波动方程、壳体表面的边界条件和傅氏变换方法求解声压的表达式，然后将其引入壳体振动方程，最后求解双层壳体声-流体-结构耦合方程，计算结果用辐射声功率、表面振动均方速度级和辐射效率的形式表示。讨论了有限长单、双层壳体声辐射性能的差别以及双层壳体壳间连接形式和实肋板参数的变化对其声辐射性能的影响，得出结论：当内壳受激振动，通过外壳向外场辐射噪声时，其主要通道为连接内外壳壳体的实肋板，其次才是环形流场中的流体介质。     

港口吞吐量预测的系统动力学模型构建

将系统动力学方法运用于港口吞吐量预测，可以较好地解决传统预测方法中考虑因素较少的问题，在对港口系统主要因素及因果关系分析的基础上，建立港口吞吐需求量及供给量系统动力学模型，并采用南京港各相关统计数据对模型进行了仿真和验证，结果证明该模型有效可行．     

Determination of attainable regions in ship maneuvers: an application of differential inclusions to the modeling of ship dynamics

A commonly used mathematical tool in vehicle dynamics simulation is the ordinary differential equation. However, in some situations, these equations may not be sufficient to solve problems. For robust flight, surface ship or submarine control design, safety assessment, missile and aircraft guidance, the influence of disturbances, and differential games of pursuit–evasion, more versatile tools are needed. The differential inclusion (DI) is a generalization of a differential equation that can be extremely useful. The solution of a DI is not just a model trajectory or a set of trajectories obtained by a randomization of the original problem. The solution is a reachable set, and it is a deterministic object. A differential inclusion solver and its application to vessel movement are described. Compared to previous publications on the DI solver, the new feature is an implementation of the fuzzy sets technique to improve the resulting images. It is pointed out that the reachable sets cannot be assessed properly while treating the uncertain variables as random. The application of the DI solver can give a proper view of the regions in the state space where all the possible model trajectories belong.     

独立轮对柔性耦合径向转向架的导向特点

通过理论分析推导出独立轮对柔性耦合径向转向架最佳耦合刚度的表达公式,该公式表明:独立轮对柔性耦合径向转向架导向能力的好坏关键在于耦合刚度的选取,而耦合刚度的选取只与列车系统的二系悬挂纵向刚度、二系悬挂横向跨距、车辆定距、转向架轴距等内在结构参数有关,与列车运行速度和轨道曲线半径等外界环境参数无关。进一步的仿真分析表明:无论曲线半径、运行速度、未平衡离心加速度和轮对横移量等外界条件怎么变化,独立轮对柔性耦合径向转向架都会在二系悬挂系统和柔性耦合元件的协调作用下自动把前后轮对调整到径向位置,这不仅验证了理论推导公式的正确性,也佐证了独立轮对柔性耦合转向架面对复杂多变的外部环境确实具有很强的自适应径向调节能力。