基于MPC885的加密无线AP的设计

首先简单介绍了Motorola公司MPC885处理器及其内部集成的安全引擎，然后提出了一种基于MPC885的、具有硬件加密功能的无线AP系统设计方案，并对其性能进行了简要分析。     

Trace element levels in some commercially valuable fish species from coastal waters of Mediterranean Sea, Egypt

Concentrations of 5 trace elements (Cd, Pb, Cu, Cr, Zn) were determined in muscle of fishes collected from two coastal areas of the Egyptian coast of the Mediterranean Sea west of Alexandria (El-Mex Bay and Eastern Harbour). Sardinella aurita, Alepes djedaba, Siganus luridus, Siganus rivulatus, Sphyraena chrysotoenia, and Scomberomorus commerson were collected from El-Mex Bay. While Boops boops, Lithognathus mormyrus, Sparisoma cretense, Serranus cabrilla and Synodus saurus were collected from the E.H. In all fishes zinc was highest (up to 57 mg/kg) followed by Cr, Cu, Pb and Cd. The concentrations of several metals in fishes were significantly different among the species in each area. For all trace element examined, the concentrations decreased significantly with body weight of some fishes. In contrast, a positive correlation with body weight was found especially for Zn and Cu concentrations in 5 fish species and for Pb in 4 fish species. The concentrations of Cd, Pb and Zn were higher in fishes from El-Mex Bay (3.76, 6.49 and 57.21 mg/kg) than those from Eastern Harbour, whereas the opposite trend was observed for Cu and Cr, revealing the direct sources of trace metal pollution present in El-Mex coastal area. Levels of Cr surpassed the Maximum Permissible Concentration in most fish tissues, followed by Pb and Cd in some species. Cu and Zn presented concentrations below the maximum permissible levels in fish tissues.     

不同状腿结构的自升式平台对比分析(英文)

The jack-up unit is one of the best drilling platforms in offshore oil fields with water depth shallower than 150 meters.As the most pivotal component of the jack-up unit,the leg system can directly affect the global performance of a jack-up unit.Investigation shows that there are three kinds of leg structure forms in the world now:the reverse K,X,and mixing types.In order to clarify the advantage and defects of each one,as well as their effect on the global performance of the jack-up unit,this paper commenced to study performance targets of a deepwater jack-up unit with different leg systems(X type,reverse K type,and mixing type).In this paper a typical leg scantling dimension and identical external loads were selected,detailed finite element snalysis(FEA) models were built to simulate the jack-up unit’s structural behavior,and the multi-point constraint(MPC) element together with the spring element was used to deal with the boundary condition.Finally,the above problems were solved by comparative analysis of their main performance targets(including ultimate static strength,dynamic response,and weight).     

基于MATLAB/SimuLink平台的整车控制器设计

介绍了一种基于MATLAB/SimuLink平台的新能源汽车用整车控制器的软硬件设计。阐述了基于MATLAB的模型设计及嵌入式实现流程、整车控制器硬件系统的设计、MPC555的BooLoder技术及MATLAB平台下对MPC555目标参数设置。介绍了整个基于MATLAB/SimuLink平台整车控制器的软硬件设计过程。     

Nonlinear gating control for urban road traffic network using the network fundamental diagram

This work proposes a nonlinear model predictive controller for the urban gating problem. The system model is formalized based on a research on existing models of the network fundamental diagram and the perimeter control systems. For the existing models, modifications are suggested: additional state variables are allocated to describe the queue dynamics at the network gates. Using the extended model, a nonlinear model predictive controller is designed offering a ‘non‐greedy’ policy compared with previous, ‘greedy’ gating control designs. The greedy and non‐greedy nonlinear model predictive control (NMPC) controllers are compared with a greedy linear feedback proportional‐integral‐derivative (PID) controller in different traffic situations. The proposed non‐greedy NMPC controller outperforms the other two approaches in terms of travel distance performance and queue lengths. The performance results justify the consideration of queue lengths in dynamic modeling, and the use of NMPC approach for controller design. Copyright © 2014 John Wiley & Sons, Ltd.     

基于MPC5634M的μ C/COS-Ⅱ移植

μC/OS-Ⅱ以其结构清晰、性能稳定、源码公开等特点,受到广大嵌入式系统开发人员的青睐,在过程控制、通讯类、汽车业、机器人、航空航天等各个领域得到了广泛的应用。MPC5634M芯片是飞思卡尔一款高性能32位处理器,主要应用到发动机控制和电机控制等动力总成控制。论文实现了μC/COS-Ⅱ在MPC5634M单片机上的成功移植,运行时序精确,具有一定的实用价值。     

基于模型预测控制的船舶动力定位约束控制

研究了模型预测控制在船舶动力定位系统约束控制中的应用,建立了3自由度动力定位船舶的数学模型,提出了船舶动力定位系统设计中应考虑的各种约束.针对某供应船,根据模型预测控制理论进行了动力定位控制器设计,使约束的处理问题贯穿于控制系统设计的始终.仿真试验验证了模型预测控制算法应用于船舶动力定位约束控制的有效性.     

基于MPC算法的电力系统负荷频率控制

针对在大规模电力系统互联情况下如何准确、快速控制系统负荷频率的问题,本文结合模型预测控制算法（MPC）,提出了一种多区域电力系统负荷频率控制方法.该方法实现了超前预测、多约束条件滚动优化和反馈校正,克服了传统PI调节方法对系统参数的敏感性,提高了负荷频率控制系统的稳定性和鲁棒性.文中对三区域电力系统进行建模,并在每个系统中设置了MPC控制器和PI控制器.仿真表明,在多区域系统、多约束条件下MPC算法在频率控制的稳定性和快速性方面远优于PI算法;当系统参数偏移10%时,MPC算法仍能保证控制性能.     

Optimally combined headway and timetable reliable public transport system

This paper presents a model-based multiobjective control strategy to reduce bus bunching and hence improve public transport reliability. Our goal is twofold. First, we define a proper model, consisting of multiple static and dynamic components. Bus-following model captures the longitudinal dynamics taking into account the interaction with the surrounding traffic. Furthermore, bus stop operations are modeled to estimate dwell time. Second, a shrinking horizon model predictive controller (MPC) is proposed for solving bus bunching problems. The model is able to predict short time-space behavior of public transport buses enabling constrained, finite horizon, optimal control solution to ensure homogeneity of service both in time and space. In this line, the goal with the selected rolling horizon control scheme is to choose a proper velocity profile for the public transport bus such that it keeps both timetable schedule and a desired headway from the bus in front of it (leading bus). The control strategy predicts the arrival time at a bus stop using a passenger arrival and dwell time model. In this vein, the receding horizon model predictive controller calculates an optimal velocity profile based on its current position and desired arrival time. Four different weighting strategies are proposed to test (i) timetable only, (ii) headway only, (iii) balanced timetable - headway tracking and (iv) adaptive control with varying weights. The controller is tested in a high fidelity traffic simulator with realistic scenarios. The behavior of the system is analyzed by considering extreme disturbances. Finally, the existence of a Pareto front between these two objectives is also demonstrated.