Centralized Modular Diagnosis and the Phenomenon of Coupling

This paper studies modular decomposition as an approach for failure diagnosis based on Discrete Event Systems. This paper also analyses the problem of coupling produced in the implementation of centralized modular diagnosers, as coupled diagnosers cannot carry out their own diagnosis task, when there is a failure in another subsystem sharing a common energy or material flow. In addition, we propose a method to avoid diagnoser coupling, by means of decoupling functions using non-local information with respect to the coupled diagnoser and generated in the diagnoser where the failure has been isolated.     

Hybrid ceramic-polymer material for wood coating with high wearing resistance

The synthesis and characterization of a hybrid ceramic-polymer coating with high wearing resistance and designed to cover wood surfaces, are reported in this work. This hybrid material provides a high wearing resistance (400% higher than a conventional commercial product typically used to protect these surfaces); additionally it has a high UV resistance and high transparency and gloss. The wood surfaces were previously treated either with a primer coating or with a special coupling agent, before the hybrid coating was applied; in both cases, good adhesion with the substrate was obtained. Electronic Publication     

系统参数对多平行轴齿轮-转子系统固有特性的影响

建立了一个三平行轴齿轮耦合转子系统的有限元模型,利用Matlab软件对其进行了固有特性的分析,通过与成熟有限元分析软件ANSYS的计算结果进行对比,验证了该模型和计算结果的正确性。并在此基础上,分别讨论了齿轮啮合刚度、安装角、螺旋角以及轴承刚度对系统弯-扭-轴-摆耦合固有特性的影响。结果表明,齿轮参数会影响系统耦合新频率,而轴承刚度则会造成系统固有频率的突变以及振型的变化。该研究结果为传动系统的优化设计提供了理论基础。     

双曲拱桥的车桥耦合振动试验研究

行驶汽车的轴重和速度超出设计范围给双曲拱桥的动力性能造成了很大的影响,然而这方面的研究却很少.结合1座旧双曲拱桥,进行了实地车桥耦合振动试验,得出了车速与动力系数、冲击系数之间的关系,以及车辆荷载作用下桥梁振动的规律;同时对旧桥进行了参数分析,并据此进行了裸拱状态的理论耦合振动分析,得出了一些结论,可为以后双曲拱桥的评估及加固设计提供参考.     

十字万向联轴器的有限元分析

应用有限元方法和可靠的结构分析程序，对十字轴式万向联轴器进行了必要的分析计算，得出了避免共振的参考数据。     

用于高频干扰计算的HVDC换流变压器模型

提出了两种用于换流站高频干扰计算的换流变压器模型.在传统的简单模型的基础上,考虑了换流变压器的绕组间电容和低压绕组的对地电容,提出了综合漏感和分布电容影响的改进模型,该模型在频率大于20kHz的高频段可简化为纯电容模型,同时给出了两种模型中参数的确定方法.最后给出了贵广工程的计算结果,证明所提出的两种模型是可行的.     

Modeling and Simulation for CODAD Propulsion Plant with Fluid Coupling during Engaging and Disengaging Process

A mathematical model of fluid coupling is established based on the study of working principle. Based on the simulated model of Combined Diesel and Diesel （CODAD） propulsion plants with fluid coupling, the dynamic characteristics of CODAD propulsion plants during engaging and disengaging process are analyzed. The effects of different oil curve upon the dynamic process of the system are discussed, and the corresponding conclusion is drawn. The analysis gives some theoretic foundations for the optimization of performance of the CODAD plants with fluid coupling during engaging and disengaging processes.     

Discontinuous Bifurcation Analysis of a Coupled Rate-Dependent Damage and Plasticity Model for Impact Responses

To identify the transition from continuous to discontinuous modes in the failure evolution of quasibrittle materials under impact, a coupled rate-dependent damage and plasticity model is developed within the thermodynamics framework. Due to the simplicity in model formulation, a continuum tangent stiffness tensor could be obtained for discontinuous bifurcation analysis, and the model parameters could be calibrated from split Hopkins pressure bar experimental data available. The coupled rate-dependent model could describe not only the pressure-dependent hardening/softening response but also the degradation of material stiffness under impact. A geometric criterion with a corresponding solution scheme is presented to explore the rate-dependent transition from continuous to discontinuous failure modes in the Mohr coordinates. The uniaxial compressive loading path is considered to illustrate the loading rate effect on the critical localization orientation and hardening parameters. It appears from the preliminary results that the coupled rate-dependent local continuum model might be combined with a decohesion model via discontinuous bifurcation analysis so that large-scale simulation of failure evolution could be performed without invoking higher-order spatial terms in the stress-strain space.     

列车折关检测系统分析及数据处理算法研究

折角塞门非正常关闭问题至今仍是列车制动系统中一个未完全解决的难题.文章介绍了列车折关检测系统原理,分析了检测系统中的主要功能模块;针对检测数据处理的关键技术,给出了相应解决算法,实验表明处理算法理想有效.     

介观电容耦合电路的量子纠缠效应

应用介观电子线路制备量子态并实现相应的信息传输与控制是量子信息学的重要课题。利用介观耦合电路给出了制备双模压缩真空态的方案,研究了模间纠缠度与压缩幅度参数的关系。结果显示:模间纠缠度和2个回路的电感比值有关,与耗散无关,且存在一个极大值。