Dynamic Stability Analysis of Linear Time-varying Systems via an Extended Modal Identification Approach

The problem of linear time-varying（LTV） system modal analysis is considered based on time-dependent state space representations, as classical modal analysis of linear time-invariant systems and current LTV system modal analysis under the ＂frozen-time＂ assumption are not able to determine the dynamic stability of LTV systems. Time-dependent state space representations of LTV systems are first introduced, and the corresponding modal analysis theories are subsequently presented via a stabilitypreserving state transformation. The time-varying modes of LTV systems are extended in terms of uniqueness, and are further interpreted to determine the system＇s stability. An extended modal identification is proposed to estimate the time-varying modes, consisting of the estimation of the state transition matrix via a subspace-based method and the extraction of the time-varying modes by the QR decomposition. The proposed approach is numerically validated by three numerical cases, and is experimentally validated by a coupled moving-mass simply supported beam exper- imental case. The proposed approach is capable of accurately estimating the time-varying modes, and provides anew way to determine the dynamic stability of LTV systems by using the estimated time-varying modes.

ARCHITECTURE OF MANUFACTURING EXECUTION SYSTEM IN THE EXTENDED ENTERPRISE

The extended enterprise is formed according to the philosophy of dispersednetworked manufacturing. Manufacturing execution system (MES) can close the information gap whichexists between device control system and production information management system. The functions andthe web-based architecture of the MES in the extended enterprise are introduced. Using thecooperating system models of object-oriented and distributed agents and CORBA, all objects keep touniform interface standards and are easily inserted to object request broker. The utilization ofdistributed MES in extended enterprise can adapt fast change of manufacturing environment andresource. It also can improve the independent management capability of manufacturing cell and theenterprise response capability to global economic competition.

A novel extended Tsypkin criterion for discrete-time descriptor systems with ferromagnetic hysteresis nonlinear physical phenomenon

This paper concerns the absolute stability problem of discrete-time descriptor systems with feedback connected ferromagnetic hysteresis nonlinearities. The ferromagnetic hysteresis model satisfies the passivity conditions of hysteresis operator, that is the input-output relation of the transformed operator is passive. The bound condition of the solution of the ferromagnetic hysteresis model is given. Through the framework of loop transformation, an augmented discrete-time descriptor system model is established for the stability analysis. A new extended Tsypkin criterion for the absolute stability of discrete-time descriptor systems with hysteresis is presented based on the linear matrix inequalities technique. A numerical example is given to illustrate the effectiveness of the extended criterion.

Reliability Modelling and Analysis of Satellite Propulsion System Based on Reliability Block Diagram and Extended Object-Oriented Petri Net

Modern satellite propulsion systems are generally designed to fulfill multiphase-missions.Traditional reliability modelling methods have problems of inadequate depict capacity considering complex systems such as satellite propulsion system.An extended object-oriented Petri net(EOOPN)method was proposed to facilitate the reliability modelling of satellite propulsion system in the paper.The proposed method was specified for modelling of phased mission system,and it could be implemented by generating combination of Petri net(PN)principles and object-oriented(OO)programming.The effectiveness of the proposed method was demonstrated through the reliability modelling of a satellite propulsion system with EOOPN.The major advantage of the proposed method is that the dimension of net model can be reduced significantly,and phased mission system at system,phase,or component levels can be respectively depicted.Furthermore,the state-space explosion problem is solved by the proposed EOOPN model efficiently.

Adaptive synchronization of a hyperchaotic L system based on extended passive control

This paper investigates the adaptive synchronization of hyperchaotic Lii systems based on the method of extended passive control. By combining the feedback control, the extended passive control method with two output variables is developed, which can synchronize hyperchaotic Lu systems asymptotically and globally more easily without knowing the bound of state of the hyperchaotic system. Adaptive laws are introduced to estimate the unknown parameters as well. Simulation results show the effectiveness and flexibility of the proposed control scheme.

Score System Study for Hand-Extended Noodle Quality Based on HMW-GS Index in Wheat Flour

Hand-extended noodle, a special kind of noodle, requires particular quality flour to make it. High molecular weight glutenin subunits （HMW-GS） in wheat are important protein subunits, which affect flour quality. To improve breeding and selection efficiency of wheat varieties which are used in making hand-extended noodle, 100 spring wheat varieties were selected to study the importance of HMW-GS on noodle quality score indexes such as color, appearance, taste agreeability, toughness, stickiness, smoothness, taste, and total score, through methods of quantity theory and statistic evaluation. It was shown that the hand-extended noodle quality score of HMW-GS 1, 2°, N, 7, 7 ＋ 8, 17 ＋ 18, 22, 2 ＋ 10, 2 ＋ 11, 2＋ 12, 5 ＋ 10, and 10 was 5.40, 5.35, 0, 2.55, 2.56, 9.19, 0.05, 0.15, 1.49, 1.14, 10.00, and 5.14, respectively. The score system for hand-extended noodle quality based on HMW-GS index included eight multiple linear regression equations （R^2 〉 0.98）. Hence, using the HMW-GS composition, the eight hand-extended noodle quality indexes would be forecasted exactly. Results indicated that ideal subunit compositions of HMW-GS for this special usage were composition 1, 17 ＋ 18, 5 ＋ 10, or composition 2°, 17 ＋ 18, 5 ＋ 10. This standard could be used on variety selection in the early generation of breeding crosses. HMW-GS 2 ＋ 10, 2 ＋ 11, and 2 ＋ 12 were the least desirable subunits for hand-extended noodle, which should be avoided in wheat variety selection aimed for hand-extended noodle flour use.

Noether's theorem for non-conservative Hamilton system based on El-Nabulsi dynamical model extended by periodic laws

This paper focuses on the Noether symmetries and the conserved quantities for both holonomic and nonholonomic systems based on a new non-conservative dynamical model introduced by E1-Nabulsi. First, the E1-Nabulsi dynamical model which is based on a fractional integral extended by periodic laws is introduced, and E1-Nabulsi-Hamilton＇s canoni- cal equations for non-conservative Hamilton system with holonomic or nonholonomic constraints are established. Second, the definitions and criteria of E1-Nabulsi-Noether symmetrical transformations and quasi-symmetrical transformations are presented in terms of the invariance of E1-Nabulsi-Hamilton action under the infinitesimal transformations of the group. Fi- nally, Noether＇s theorems for the non-conservative Hamilton system under the E1-Nabulsi dynamical system are established, which reveal the relationship between the Noether symmetry and the conserved quantity of the system.

Hierarchical Modeling by Recursive Unsupervised Spectral Clustering and Network Extended Importance Measures to Analyze the Reliability Characteristics of Complex Network Systems

The complexity of large-scale network systems made of a large number of nonlinearly interconnected components is a restrictive facet for their modeling and analysis. In this paper, we propose a framework of hierarchical modeling of a complex network system, based on a recursive unsupervised spectral clustering method. The hierarchical model serves the purpose of facilitating the management of complexity in the analysis of real-world critical infrastructures. We exemplify this by referring to the reliability analysis of the 380 kV Italian Power Transmission Network (IPTN). In this work of analysis, the classical component Importance Measures (IMs) of reliability theory have been extended to render them compatible and applicable to a complex distributed network system. By utilizing these extended IMs, the reliability properties of the IPTN system can be evaluated in the framework of the hierarchical system model, with the aim of providing risk managers with information on the risk/safety significance of system structures and components.

A kind of extended Korteweg-de Vries equation and solitary wave solutions for interfacial waves in a two-fluid system

This paper considers interfacial waves propagating along the interface between a two-dimensional two-fluid with a flat bottom and a rigid upper boundary. There is a light fluid layer overlying a heavier one in the system, and a small density difference exists between the two layers. It just focuses on the weakly non-linear small amplitude waves by introducing two small independent parameters： the nonlinearity ratio ε, represented by the ratio of amplitude to depth, and the dispersion ratio μ, represented by the square of the ratio of depth to wave length, which quantify the relative importance of nonlinearity and dispersion. It derives an extended KdV equation of the interfacial waves using the method adopted by Dullin et al in the study of the surface waves when considering the order up to O（μ^2）. As expected, the equation derived from the present work includes, as special cases, those obtained by Dullin et al for surface waves when the surface tension is neglected. The equation derived using an alternative method here is the same as the equation presented by Choi and Camassa. Also it solves the equation by borrowing the method presented by Marchant used for surface waves, and obtains its asymptotic solitary wave solutions when the weakly nonlinear and weakly dispersive terms are balanced in the extended KdV equation.

Functionality evaluation of system of systems architecture based on extended influence diagrams

System of systems architecture（SoSA） has received increasing emphasis by scholars since Zachman ignited its flame in 1987. Given its complexity and abstractness, it is critical to validate and evaluate SoSA to ensure requirements have been met.Multiple qualities are discussed in the literature of SoSA evaluation, while research on functionality is scarce. In order to assess SoSA functionality, an extended influence diagram（EID） is developed in this paper. Meanwhile, a simulation method is proposed to elicit the conditional probabilities in EID through designing and executing SoSA. An illustrative anti-missile architecture case is introduced for EID development, architecture design, and simulation.

EXTENDED SYSTEM, BIFURCATION PROBLEM AND HIGH ORDER SINGULARITIES

In this paper, we consider two extended systems. When using them for the two parameter bifurcation problems, the simple bifurcation point with regard to lambda on turn into the simple turning point with. regard to mu. Simple high orde bifurcation point is first studied without using the symmetry condition.

Exact Traveling Wave Solutions for the System of Shallow Water Wave Equations and Modified Liouville Equation Using Extended Jacobian Elliptic Function Expansion Method

In this work, an extended Jacobian elliptic function expansion method is proposed for constructing the exact solutions of nonlinear evolution equations. The validity and reliability of the method are tested by its applications to the system of shallow water wave equations and modified Liouville equation which play an important role in mathematical physics.

基于Extend的多态PMS仿真模型

针对现有解决多态多阶段任务系统(PMS)的方法存在过程复杂、缺乏统一排序的问题,以最小割集为基础,提出基于Extend的多态PMS仿真模型。通过结构函数表达各阶段的逻辑关系,在已知基本设备失效分布函数的情况下,利用抽样统计思想处理多态PMS中的阶段依赖和模式依赖关系。相比DEP-BDD解析算法,应用该模型求解PMS能在保证可靠度误差较小、稳定性较好的基础上,使建模分析过程更简单。

基于EXTEND的排队规则仿真研究

排队系统是一种典型的离散事件动态系统,在不同的排队规则下会有不同的系统特性。通过仿真软件EXTEND对不同排队规则下的排队系统进行了建模及仿真。在分析仿真结果的基础上,探讨了不同排队规则下排队系统的内在规律。

Extended Fisher-Kolmogorov系统的整体吸引子及其分形维数估计

考虑在一般情况下ExtendedFisher Kolmogorov(EFK)系统的解的长时间行为,利用解的存在唯一性和在H和V1空间的吸收集的存在性,证明了该系统在L2中的整体吸引子的存在性,并给出了其整体吸引子的分形维数估计.

基于HTCPN和Extend的装备保障系统建模与仿真

构建支撑装备保障问题分析和决策的仿真平台是装备保障研究和实践的一条必由之路。装备保障系统仿真模型是仿真平台的重要组成部分。针对装备保障系统的运行流程及其层次性特点,基于层次时间着色Petri网(HTCPN)提出了一种建立在层次化、模块化和标准化基础上的保障系统Petri建模思路,在此基础上,基于Extend平台设计了装备保障系统仿真模型,说明了基本功能组成模块。最后,以舰艇海上巡航任务条件下的装备保障系统为例,实现了仿真模型NEISSM,开展参数敏感性分析仿真试验,获得了较好的结论,证明了仿真模型设计的合理性和可行性。

带Neumann边界条件的Extended Fisher-Kolmogorov系统的定态分歧

运用规范化的Lyapunov-Schmidt约化方法,得到了带Neumann边界条件的Extended FisherKolmogorov系统产生超临界和次临界分歧的完整判据,给出了分歧解的具体表达式,并进一步讨论了分歧解的正则性.

Extended Mendelsohn三元系大集的构造

Mendelsohn三元系大集(LMTS)是一类有向设计的大集,它的存在性问题已完全解决.若在以上的设计中要求有序对(x,x)也出现,则称这样的设计为extended Mendelsohn三元系大集(LEMTS).给出了LEMTS的构造,从而完全解决了LEMTS的存在性问题.

伽玛刀Extend系统分次治疗颅内良性病变初步经验

目的探讨应用伽玛刀Extend系统分次治疗颅内良性病变的临床效果。方法回顾性分析应用伽玛刀Extend系统治疗13例颅内良性病变的临床资料,其中脑膜瘤7例,垂体瘤5例,海绵窦海绵状血管瘤1例。病变体积1.48～54.26 cm3,平均14.09 cm3。照射方案:10例行2分次治疗,3例行3分次治疗;病变周边剂量16.2～26.2 Gy,平均19.5 Gy;等剂量曲线为45%～50%,平均49.2%。结果随访13例,时间10～24个月,平均18.3个月,MRI检查:病变缩小5例,无明显变化7例,增大1例。12例病变压迫或紧贴视神经、视交叉者,视力提高6例,稳定5例,加重1例。视野缺损改善3例,稳定8例,加重1例。无新发海绵窦神经受损表现。结论 Extend伽玛刀系统分次治疗可用于治疗邻近放射敏感或重要结构的病变以及体积较大、需要重复治疗的病变。

基于Extend的投送基地物资转运作业系统资源分配模型构建

物资转运作业系统组板效率是影响作业效能的瓶颈因素。以物资出库为例,通过分析投送基地物资转运作业系统的空侧出库作业流程,提出组板台资源分配规则,依托Extend仿真平台,建立资源分配模型,进而创建带有资源分配功能的系统整体模型。面向具体保障任务进行实例验证,检验该模型的可行性与有效性。