新一代载人飞船卫生区功能性空间优化设计研究

目的 开展中国新一代载人飞船卫生区的空间优化研究,探索功能性空间优化设计方法,提高载人飞船空间利用效率,同时提升航天员的舒适性体验。方法 以中国空间站卫生区的功能和结构为依据,探讨中国新一代载人飞船卫生区功能组件的构成;依据航天员在微重力状态下使用卫生区的动作与姿态,建立卫生区空间布置的初步概念;根据卫生区的舱壁布局、微重力下航天员视野区域及最佳操作空间分析,开展相关功能组件建模,基于卫生区的人机交互节点,利用JACK软件进行仿真分析与评估,结合评估结果改进设计方案,并通过追踪航天员活动轨迹产生的包络体完成卫生区的空间优化。结论 通过对比中国新一代载人飞船卫生区优化前后设计方案的舒适性、可操作性和空间尺寸,验证了功能性空间优化设计方法的有效性和可靠性,为载人航天器舒适性与集成化设计提供了参考。     

棋牌游戏与事件对策

博弈的原意便是下棋,博弈论的概念也源于棋类游戏．而博弈论的现有成果还难以描述和处理棋牌游戏这一类复杂的动态过程．为此．在分析棋牌游戏特点的基础上．指出它们属于离散事件的动态过程;在阐述离散事件动态系统（DEDS）特点与方法的基础上,应用DEDS的有关理论为象棋博弈过程建模,并提出了事件对策的概念与形式框架．探讨了事件对策理论在战争模拟中的应用,为迅速发展的机器博弈研究创造了良好的理论条件．     

电磁悬浮隔振系统控制方法

铁对航空航天等许多需要高质量隔振环境的工程领域,在指出了传统隔振方式的不足后,研究了一种新型的隔振方法－－电磁悬浮隔振,并主要讨论了水平和竖直平动自由度的控制方法,它是采用主动控制的电磁力对象进行悬浮隔振,控制方便灵活,各自由度可进行独立控制,隔振效果可靠,具有极大的发展前景。     

采用磁流变阻尼器的汽车悬架系统的杂交建模

利用线性回归方法,对磁流变阻尼器阻尼力与速度、加速度间的函数关系作了线性与非线性的区分,采用神经网络对非线性部分进行建模,并结合线性部分构建了磁流变阻尼器的模型。在此基础上,融合汽车悬架的先验知识模型,建立了采用磁流变阻尼器的4自由度1/2车辆半主动悬架系统的杂交模型。最后利用SANTANA 2000型轿车的参数进行仿真,并与基于磁流变阻尼器非线性滞回模型的建模方法作了比较,结果表明:杂交建模方式结构简单、计算量小、模型准确、便于进行系统主要动力学特性的分析。     

CCD立靶坐标测量系统精度仿真分析

根据CCD立靶坐标测量系统的工作原理,对系统测量精度进行了理论分析,建立了系统测量精度数学模型,利用计算机仿真技术对其进行仿真计算,1 m靶面的测量精度为0.8 mm×1.0 mm;4 m靶面的测量精度为3.0 mm×3.0 mm.通过理论计算和试验结果的对比,证明该数学模型可准确描绘系统的测量精度.     

滚筒采煤机固有频率的计算机仿真

滚筒采煤机的固有频率影响着振动形式和振动烈度,因此采用计算机仿真方法得到一般滚筒采煤机前几阶固有频率值,根据得到的结果给出改善其振动特性的建议,为后续进一步研究奠定基础。     

Numerical Simulation of Brittle Damage in Concrete Specimens

A framework for damage mechanics of concrete is applied to simulate the nonlinear elastic deformation behavior of concrete using finite element method (FEM). A rather simple isotropic damage model containing essentially no adjustable parameters is shown to produce results in remarkably good agreement with sample experimental data: the damage law requires only the fracture energy to be defined completely. The model is achieved by introducing a damage surface that is similar to the yield function in the conventional theory of plasticity. A special form of damage surfaces is constructed to illustrate the application of the model. A new damage criterion, defined as an equivalent strain norm, is proposed, in order to take into consideration the asymmetric behavior of concrete. For verifying the FEM program including the model, deformations predicted by this model are compared with both the experimental ones for the concrete structural model and the ones calculated without application of the continuum damage mechanics.__________Translated from Problemy Prochnosti, No. 3, pp. 57 – 74, May – June, 2005.     

An orthogonal residual procedure for non-linear finite element equations

A general and robust solution procedure for non-linear finite element equations with limit points is developed. At each equilibrium iteration the magnitude of the load is adjusted such that the residual force is orthogonal to the current displacement increment from the last equilibrium state. The method implements the physical condition that the orthogonal residual force will neither increase nor decrease the magnitude of the current displacement increment vector. The orthogonality condition is formulated directly in terms of conjugate variables and therefore does not contain any scaling parameters. Passage of load and displacement limit points is discussed as well as the relation to line search, minimum residual, and are-length methods. The method is illustrated by two examples.     

Simulating Retention in Gas–Liquid Chromatography: Benzene, Toluene, and Xylene Solutes

Accurate predictions of retention times, retention indices, and partition constants are a long sought-after goal for theoretical studies in chromatography. Although advances in computational chemistry have improved our understanding of molecular interactions, little attention has been focused on chromatography, let alone calculations of retention properties. Configurational-bias Monte Carlo simulations in the isobaric–isothermal Gibbs ensemble were used to investigate the partitioning of benzene, toluene, and the three xylene isomers between a squalane liquid phase and a helium vapor phase. The united-atom representation of the TraPPE (transferable potentials for phase equilibria) force field was used for all solutes and squalane. The Gibbs free energies of transfer and Kovats retention indices of the solutes were calculated directly from the partition constants (which were averaged over several independent simulations). While the calculated Kovats indices of benzene and toluene at T=403 K are significantly higher than their experimental counterparts, much better agreement is found for the xylene isomers at T=365 K.     

Hybrid Petri-nets for modelling and performance evaluation of supply chains

Modelling and analysis of complex and co-ordinated supply chains is a crucial task due to its inherent complexity and uncertainty. Therefore, the current research direction is to devise an efficient modelling technique that maps the dynamics of a real life supply chain and assists industrial practitioners in evaluating and comparing their network with other competing networks. Here an effective modelling technique, the hybrid Petri-net, is proposed to efficiently handle the dynamic behaviour of the supply chain. This modelling methodology embeds two enticing features, i.e. cost and batch sizes, in deterministic and stochastic Petri-net for the modelling and performance evaluation of supply chain networks. The model is subsequently used for risk management to investigate the issues of supply chain vulnerability and risk that has become a major research subject in recent years. In the test bed, a simple productive supply chain and an industrial supply chain are modelled with fundamental inventory replenishment policy. Subsequently, its performance is evaluated along with the identification and assessment of risk factors using analytical and simulation techniques respectively. Thus, this paper presents a complete package for industrial practitioners to model, evaluate performance and manage risky events in a supply chain.