电主轴单元实验平台螺栓结合部动力学模型解析

针对电主轴单元实验平台系统,在铅垂方向上建立其螺栓结合部动力学模型,利用结合面积积分法计算出结合部的特性参数,对螺栓结合部动力学模型进行理论解析,提出减小振幅的措施.     

关于牲猪动态存栏数学模型的研究

本文通过对影响牲猪动态存栏主要因素的分析,以及反映这些主要因素的特征量,用带有边界控制的一阶偏微分方程来描述牲猪生产发展的动态过程,为计算牲猪动态存栏提供了一系列公式。同时建立了较完整的牲猪动态存栏指数体系。     

基于动态逆的直升机飞行品质设计研究

直升机的固有特点使其飞行品质较差,而直升机的使用任务却要求它具有良好的飞行品质。本文采用动态逆和极点配置相结合的方法设计直升机飞行控制律,并通过仿真手段进行检验,证实了样例直升机飞行品质提高以及所用飞行控制率的鲁棒性,从而表明本文控制律的有效性。     

六缸曲轴动平衡机的微机系统

本文报道了用于测量六缸汽车发动机曲轴不平衡量的动平衡机微机系统的研制。文中详细地论述了该系统的数据处理方法与LED显示电路、控制接口、程序等的设计原理。     

Non-linear state space models with partially specified distributions on states

The author argues, through the discussion of several examples, why models like the power steady model (Smith 1979, 1981a) are attractive not only because of the simplicity of their one-step-ahead forecast distributions but also because they can be justified through sets of properties that any gradually evolving process may be expected to satisfy.     

树木生长中树枝形态的3D建模

3D造型的基本目标就是在可接受的算法复杂性下，生成真实感可以与实物媲美的虚拟物体。静态的树的3D造型方法通常利用树的分形特征和随机性。我们运用动态的基于生长的树的造型方法。树形态的形成受内在基因和外在环境因素影响，因此可以通过控制树的生长过程实现其造型。在系统中引入了力的概念，用来控制树的生长．有两种类型的力，称为内力和外力，分别模拟树自身的生命力和外界的环境因素．结合分形机制，该系统可以模拟各种常规状态的树。该动态系统的突出特点是可以方便地控制最终造型，通过调整力参数，可以获得最终造型的连续变化和形态控制。     

Quality/value relationships for imperfect weather forecasts in a prototype multistage decision-making model

Some theoretical results concerning the nature of the relationship between the scientific quality and economic value of imperfect weather forecasts are obtained. A prototype multistage decision-making model is considered, involving only two possible actions and two possible states of weather. This particular form of model is motivated by a real-world application known as the fruit-frost problem. For an infinite-horizon, discounted version of this model it is shown that economic value remains zero below a forecast quality threshold and then rises monotonically but nonlinearly above this threshold. In particular, the relative sensitivity of economic value to changes in the quality of forecasts increases as perfect information is approached. This curve is compared with quality/value relationships that have been obtained for other versions of the model; namely, a single-stage model and a multistage, finite-horizon model.     

键合图法非线性系统动态仿真

线性系统动态仿真的键合图法已经较完善地建立起来。但是对非线性系统应用键合图法进行动态仿真尚有许多工作要做,这不仅由于其系统状态方程的建立比较复杂,而且其解法也比较复杂。本文在考虑到混合因果关系的情况下,推出了非线性多流口系统状态方程的统一表达式,并采用有限差分同Broyden的拟牛顿法相结合来求解。最后,给出具体实例对所述方法加以验证。     

On Incentive Equlibria for Dynamic Games

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