H∞ synchronization of uncertain fractional order chaotic systems: adaptive fuzzy approach

This paper presents a novel adaptive fuzzy logic controller (FLC) equipped with an adaptive algorithm to achieve H(∞) synchronization performance for uncertain fractional order chaotic systems. In order to handle the high level of uncertainties and noisy training data, a desired synchronization error can be attenuated to a prescribed level by incorporating fuzzy control design and H(∞) tracking approach. Based on a Lyapunov stability criterion, not only the performance of the proposed method is satisfying with an acceptable synchronization error level, but also a rather simple stability analysis is performed. The simulation results signify the effectiveness of the proposed control scheme.     

Demonstrative fractional order – PID controller based DC motor drive on digital platform

In industrial drives applications, fractional order controllers can exhibit phenomenal impact due to realization through digital implementation. Digital fractional order controllers have created wide scope as it possess the inherent advantages like robustness against the plant parameter variation. This paper provides brief design procedure of fractional order proportional-integral-derivative (FO-PID) controller through the indirect approach of approximation using constant phase technique. The new modified dynamic particle swarm optimization (IdPSO) technique is proposed to find controller parameters. The FO-PID controller is implemented using floating point digital signal processor. The building blocks are designed and assembled with all peripheral components for the 1.5 kW industrial DC motor drive. The robust operation for parametric variation is ascertained by testing the controller with two separately excited DC motors with the same rating but different parameters.     

Comments on "H∞ synchronization of uncertain fractional order chaotic systems: adaptive fuzzy approach" [ISA Trans 50 (2011) 548-556

In this note, we demonstrate that the stability analysis in the main theorem of the paper [Lin T-C, Kuo C-H. H(∞) synchronization of uncertain fractional order chaotic systems: adaptive fuzzy approach. ISA Trans 2011;50:548-56] is wrong.     

A fractional coverage model for gas–surface interaction in reciprocating sliding contacts

A model of fractional coverage in reciprocating sliding contact is developed. The sliding velocity profiles, the contact pressure distribution, the lengths of the slider or wear-track, and the periods of dwell where the slider is held stationary at the turn around locations are all variables. The model is evaluated for the condition of a constant fully reversing sliding speed with a uniform contact pressure and dwell. Plots are presented for surface area fractional coverage as a function of position illustrating the effects of individually varying vapor pressure, velocity, load, and dwell. The prediction of a steady state friction coefficient dependence on position is discussed, as well as the locations of maximum and minimum friction coefficient. The model predicts coverage to be enhanced by decreasing loads, decreasing sliding speeds, increasing gas pressures, and increasing periods of dwell.     

The application on order analysis for the rotating machinery with LabVIEWEI北大核心CSCD

Order analysis is regarded as one of the most significant method for monitoring and analyzing rotational machinery for the phenomenon of " frequency smear".However,the order analysis based on resampling is a signal processingwhich converts the constant time interval sampling into constant angle interval sampling,while with the variety of the rotational speed.The superiority of the order analysis is investigatedon implement of order analysis.Andthrough comparing the advantage and disadvantage between spectrum and order analysis,the paper will discuss the order analysis form a deep perspective.     

Coordination of order and production policy in buyer–vendor chain using PROSA Holonic architecture

Supply chain (SC) coordination can be pursued by adopting a centralized or decentralized decision-making approach. In recent years, new software architecture for managing the supply chain at the tactical and operational levels has emerged. It views the supply chain as a set of intelligent software agents, each responsible to perform one or more activities in the supply chain while interacting and negotiating with other agents in the planning and execution of these responsibilities. This paper describes a practical system framework for coordination activities in a buyer–vendor chain to determine the best decision making in the chain using the holonic paradigm. In the present article, while reference is made to the holonic paradigm, its related concepts as well as the implementation aspects of the mentioned paradigm within a supply chain are discussed. Throughout the article, as we try to cast light on the Product-Resource-Order-Staff Architecture of this approach, attention is paid to the operational advancements of the model in order for the model to be responsive to the needs of coordination of product and information flows within a buyer–vendor chain under present stochastic environments. The proposed holonic model in this article makes use of intelligent agents and mathematical models to build decision-making models in the proposed holons, as well as solution algorithms, negotiation mechanisms, and coordination-expanded policies in the mentioned architecture. Numerical studies are also provided to illustrate the effectiveness of the proposed models and methods.     

Use of a higher order Heydemann–Welch model to characterize a controlled clearance piston gauge

We present a new method for characterizing a controlled-clearance piston gauge as a primary pressure standard. This method requires operating the piston gauge to jacket pressures of over 80% of the system pressure. We present measurements on a hydraulic piston gauge with a 290 MPa maximum pressure and a nominal piston diameter of 3.27 mm. Measurements showed that the cylinder becomes stiffer as the jacket pressure increases, and that non-linear models of the Heydemann–Welch parameters improve the determination of the effective area. The relative standard uncertainty in the effective area of the piston gauge ranges from 16.0 × 10⁻⁶ to 17.6 × 10⁻⁶, and the agreement to the present NIST pressure scale is within the standard uncertainty.     

(Sm0.5Nd0.5)3Ce7Ta2O23.5和(Yb0.5Dy0.5)3Ce7Ta2O23.5氧化物的热物理性能

以高纯度Sm₂O₃、Nd O₃、Dy₂O₃、Yb₂O₃、Ce O₂和Ta₂O₅为原材料,采用多步高温固相烧结法制备了(Sm_0.5Nd⁾_0.53Ce₇Ta₂O_23.5和(Yb_0.5Dy⁾_0.53Ce₇Ta₂O_23.5氧化物,研究了其晶体结构、微观形貌、热物理性能等。结果表明:制备的氧化物均具有单一的萤石结构,其结构致密,晶界清晰,元素种类和原子比与化学式基本一致;这2种氧化物的热导率明显低于7YSZ,且(Yb_0.5Dy⁾_0.53Ce₇     

基 于 模糊PID控制 的半导体激 光器温度 控制系统设计

为实现某半导体激光器特殊应用场合对使用温度的要求,采用DSP数字信号处理芯片配合温度传感器铂热电阻Pt100和陶瓷加热片等设计了一个半导体温度控制系统。介绍了系统的硬件电路、软件控制流程模糊PID控制算法原理,建立了系统的数学模型,并利用MATLAB中的Simulink仿真环境对系统进行了仿真。最后搭建了系统测试平台,验证了系统的可靠性。     

Ta2O5对B2O3-La2O3-CaO系统玻璃生成范围的影响

本文研究了在B₂O₃—La₂O—CaO三元系统中,当Ta₂0₅的含量分别为5、10、15、20wt%时,该系统的玻璃生成范围.结果表明,随着Ta₂O₅含量的增加,系统的玻璃生成范围向贫B₂O₃,富La₂O₃边界扩充.当Ta₂O₅的含量为10wt%时,玻璃的生成区域最大.通过差热分析确定了玻璃析晶温度,并用X射线衍射进行了物相鉴定.结果表明,随Ta₂O₅取代La₂₃其主结晶相的放热峰或吸热峰的位置变化不同,所析出的结晶物质亦不同.     

Na2O-B2O3-Ta2O5系统玻璃红外光谱的研究

本文首次系统地研究了Na₂O—B₂O₃—Ta₂O₅。三元新系统的红外光谱,分析了B₂O₃、Ta₂O₅含量的变化对玻璃结构的影响。结果表明:随着Na₂O/B₂O₃比值的减小,结构中:[BO₄]四面体减小,[BO₃]三角体增加。随着Ta₂O₅含量的增加,[BO₄]四面体的数量增多,非桥氧的数量减少,表明Ta⁵⁺可以连结非桥氧,形成网络。     

Nb2O5-B2O3-K2O系统玻璃的结构与性质

本工作用大功率转靶 X 射线衍射仪研究铌硼酸盐玻璃结构;根据 B·E·War-ren 方程,建立了一种计算玻璃原子径向分布函数(RDF)的解析方法。因其涉及因素少,计算简便,适用于多元系统玻璃结构分析。应用本方法,已获得了 Nb-B-K 系统玻璃的比较完整的三维结构模型。模型表明,这种玻璃结构松散,克分子体积比较大,并具有较高的自激发极化率。于是铌硼酸盐玻璃的低密度、低折射率和相对高的色散,以及较高的电导率等特殊性质的结构因素得到了证实。     

某型高速 无人 靶机飞行控制的设计与 实现

按照某型高速无人靶机飞行特性和性能要求,详细给出了基于DSP为处理核心的飞行控制系统硬件组成和逻辑功能结构,介绍了无人靶机飞行控制策略,设计并开发了配套的地面测控程序,并进行靶机的半物理仿真实验。仿真结果表明该飞行控制系统性能良好,符合高速无人靶机的飞行要求,并成功应用于某型无人机飞行试验。     

Al2O3/(Ag72Cu28)97Ti3/Ti-6Al-4V界面反应

在1.8 ks、1 073～1 173 K条件下对Al2O3/(Ag72Cu28)97Ti3/Ti-6Al-4V进行了钎焊试验.通过扫描电镜、波谱、能谱和X射线衍射对界面反应产物进行了测试,确定了界面结构,并讨论了这些反应产物形成的可能性.结果表明,温度小于1 123 K的界面结构为Al2O3/Cu2Ti4O/Cu4Ti3+Cu固溶体/Ag-Cu共晶 + 富Ag相;温度1 173 K的界面结构为Al2O3/Cu3TiO5 + CuAl2O4/Cu4Ti3/富Ag相+ Cu4Ti3.     

Nb2O5-B2O3-K2O三元系统玻璃分相与电导的跃变

本文报导了Nb₂O₅-B₂O₃-K₂O三元系统玻璃分相导致的电导突跃现象。从“界面效应”出发,阐明了这一现象的实质,并进一步说明了同成份物质的非晶态比晶态有较高电导的可能原因。     

B2O3—La2O3—BaO—Nb2O5系统的玻璃生成范围及其性质

本文研究了在B₂O₃-La₂O₃-BaO-Nb₂O₅四元系统中当B₂O₃含量分别为25、30、35wt%时,该系统的玻璃生成范围和它们的光性、密度等变化规律。结果表明,随着B₂O₃含量的增加,系统的玻璃生成范围向贫Nb₂O₅边界扩充,富Nb₂O₅边表现收缩。工作中得出了该系统分别以SiO₂代B₂O₃、Al₂O₃代BaO后的析晶、折射率、色散及密度等性质的变化规律。最后应用该系统研制定型了713/538玻璃。     

新铌酸盐Ba5BiTi3Nb7O30的结构与介电性能

在BaO-Bi