Two-stage stochastic approach for spinning reserve allocation in dynamic economic dispatch简

A novel approach was proposed to allocate spinning reserve for dynamic economic dispatch.The proposed approach set up a two-stage stochastic programming model to allocate reserve.The model was solved using a decomposed algorithm based on Benders＇ decomposition.The model and the algorithm were applied to a simple 3-node system and an actual 445-node system for verification,respectively.Test results show that the model can save 84.5 US $ cost for the testing three-node system,and the algorithm can solve the model for 445-node system within 5 min.The test results also illustrate that the proposed approach is efficient and suitable for large system calculation.     

Finite difference method for dynamic response analysis of anchorage system简

Based on some assumptions, the dynamic analysis model of anchorage system is established. The dynamic governing equation is expressed as finite difference format and programmed by using MATLAB language. Compared with theoretical method, the finite difference method has been verified to be feasible by a case study. It is found that under seismic loading, the dynamic response of anchorage system is synchronously fluctuated with the seismic vibration. The change of displacement amplitude of material points is slight, and comparatively speaking, the displacement amplitude of the outside point is a little larger than that of the inside point, which shows amplification effect of surface. While the axial force amplitude transforms considerably from the inside to the outside. It increases first and reaches the peak value in the intersection between the anchoring section and free section, then decreases slowly in the free section. When considering damping effect of anchorage system, the finite difference method can reflect the time attenuation characteristic better, and the calculating result would be safer and more reasonable than the dynamic steady-state theoretical method. What is more, the finite difference method can be applied to the dynamic response analysis of harmonic and seismic random vibration for all kinds of anchor, and hence has a broad application prospect.     

Modeling approaches to pressure balance dynamic system in shield tunneling简

In order to deal with modeling problem of a pressure balance system with time-delay, nonlinear, time-varying and uncertain characteristics, an intelligent modeling procedure is proposed, which is based on artificial neural network （ANN） and input-output data of the system during shield tunneling and can overcome the precision problem in mechanistic modeling （MM） approach. The computational results show that the training algorithm with Gauss-Newton optimization has fast convergent speed. The experimental investigation indicates that, compared with mechanistic modeling approach, intelligent modeling procedure can obviously increase the precision in both soil pressure fitting and forecasting period. The effectiveness and accuracy of proposed intelligent modeling procedure are verified in laboratory tests.     

Analyses of noncommensurate sampling used in high-precision regenerative pseudo-noise ranging systems简

A high-precision pseudo-noise ranging system is often required in satellite-formation missions. But in an actual PN ranging system, digital signal processing limits the ranging accuracy, only level up with meter-scale. Using non-integer chip to sample time ratio, noncommensurate sampling was seen as an effective solution to cope with the drawback of digital effects. However, researchers only paid attention to selecting specific ratios or giving a simulation model to verify the effectiveness of the noncommensurate ratios. A qualitative analysis model is proposed to characterize the relationship between the range accuracy and the noncommensurate sampling parameters. Moreover, a method is also presented which can be used to choose the noncommensurate ratio and the correlation length to get higher phase delay distinguishability and lower range jitter. The simulation results indicate the correctness of our analyses and the optimal ranging accuracy can be up to centimeter-level with the proposed approach.     

Mechanism of electro-hydraulic exciter for new tamping device简

A new tamping device which is driven by an electrohydraulic exciter was proposed to overcome the limitations of mechanically driven devices.The double-rod oscillation cylinder drives the tamping arm to realize vibration.A new spin valve was designed in order to fulfill dynamic state requirements of the oscillation cylinder.Parametric analysis was carried out by establishing mathematic model.Then,the relationships among the structure of valve port and the frequency,amplitude,output shock force of the cylinder were researched.An experimental device of the electrohydraulic exciter was established to validate the theoretical results.The signals were acquired by AVANT dynamic signal analyser of vibration.The results show that new tamping device can satisfy all kinds of complex working conditions with the flexible adjustment of frequency and amplitude.     

Intelligent model of rehabilitation training program for stroke简

In view of the uncertainty and complexity,the intelligent model of rehabilitation training program for stroke was proposed,combining with the case-based reasoning（CBR） and interval type-2 fuzzy reasoning（IT2FR）.The model consists of two parts：the setting model based on CBR and the feedback compensation model based on IT2FR.The former presets the value of rehabilitation training program,and the latter carries on the feedback compensation of the preset value.Experimental results show that the average percentage error of two rehabilitation training programs is 0.074%.The two programs are made by the intelligent model and rehabilitation physician.That is,the two different programs are nearly identical.It means that the intelligent model can make a rehabilitation training program effectively and improve the rehabilitation efficiency.     

Dynamic formation control for autonomous underwater vehicles简

Path planning and formation structure forming are two of the most important problems for autonomous underwater vehicles （AUVs） to collaborate with each other. In this work, a dynamic formation model was proposed, in which several algorithms were developed for the complex underwater environment. Dimension changeable particle swarm algorithm was used to find an optimized path by dynamically adjusting the number and the distribution of the path nodes. Position relationship based obstacle avoidance algorithm was designed to detour along the edges of obstacles. Virtual potential point based formation-keeping algorithm was employed by incorporating dynamic strategies which were decided by the current states of the formation. The virtual potential point was used to keep the formation structure when the AUV or the formation was deviated. Simulation results show that an optimal path can be dynamically planned with fewer path nodes and smaller fitness, even with a concave obstacle. It has been also proven that different formation-keeping strategies can be adaptively selected and the formation can change its structure in a narrow area and restore back after passing the obstacle.     

Novel predictive model for metallic structure corrosion status in presence of stray current in DC mass transit systems简

The novel method to analyze metallic structure corrosion status was proposed in the presence of stray current in DC mass transit systems. Firstly, the characteristic parameter and the influence parameters for the corrosion status were determined. Secondly, an experimental system was established for simulating the corrosion process within the stray current interference. Then, a predictive model for the corrosion status was built, using a support vector machine （SVM） method and experimental data. The data were divided into two sets, including training set and testing set. The training set was used to generate the SVM model and the testing set was used to evaluate the predictive performance of the SVM model. The results show that the relationship between the characteristic parameter and the influence parameters is nonlinear and the SVM model is suitable for predicting the corrosion status.     

Objective measurement for image defogging algorithms简

Since there is lack of methodology to assess the performance of defogging algorithm and the existing assessment methods have some limitations, three new methods for assessing the defogging algorithm were proposed. One was using synthetic foggy image simulated by image degradation model to assess the defogging algorithm in full-reference way. In this method, the absolute difference was computed between the synthetic image with and without fog. The other two were computing the fog density of gray level image or constructing assessment system of color image from human visual perception to assess the defogging algorithm in no-reference way. For these methods, an assessment function was defined to evaluate algorithm performance from the function value. Using the defogging algorithm comparison, the experimental results demonstrate the effectiveness and reliability of the proposed methods.     

多主体系统分布式动态网络的权值平衡算法

针对加权有向图实现一致均值收敛必须是平衡图的要求，提出了一种分布式权值平衡算法使得任意一种强连通的加权有向图最终能全局渐近收敛到平衡图.该算法对有向图的各个连接权值赋初值，并计算每个节点的输入度和输出度，利用周围邻居节点的输入度和输出度之差等信息对节点的输入权值或输出权值进行权值更新，如此迭代进行直至所有节点都达到输入度和输出度权值平衡.利用特征值圆盘定理证明了保证该分布式算法实现最终一致性收敛的充分条件，给出了算法中调整因子取值的上限值.仿真结果验证了算法的有效性，并对不同调整因子下的系统收敛结果作了分析比较.     

具有切换拓扑结构的多智能体系统故障估计

针对具有切换拓扑结构的多智能体系统,研究基于模型依赖平均驻留时间的多智能体系统的执行器故障估计问题。基于相对输出估计误差,为多智能体系统设计观测器,并由此建立全局动态误差方程。考虑拓扑结构变化和存在干扰的情况,基于切换系统稳定性理论和故障诊断理论,利用模型依赖平均驻留时间方法,分析给出观测器存在条件及参数设计判据,通过适当的故障估计算法,得到故障估计误差指数收敛且满足H_∞性能的充分条件,并以线性矩阵不等式的形式给出。对多智能体系统进行仿真验证,结果表明所提出方法的正确性和有效性。     

基于中间变量观测器的多智能体故障检测

针对无向拓扑结构下线性多智能体系统,研究执行器故障的检测问题。 通过设计一系列维数扩展的虚拟系统,给出一种基于中间变量观测器的执行器故障诊断方法,克服了现有观测器所需的匹配条件,利用合适的中间变量矩阵,可同时估计系统的状态信息和故障信息。 通过智能体状态之间的残差信息,不仅可以检测智能体发生故障,还可以检测相邻智能体故障信息。 基于Lyapunov 稳定性理论,证明了系统估计误差最终有界。仿真结果验证了所提出设计方法的有效性。     

基于合同网的多agent任务分配分布式优化算法

针对合同网下的多agent系统,基于集合覆盖理论提出了一种解决子任务分配的严格启发式搜索算法;并分析了该算法的收敛性及渐进时间复杂度;证明了其搜索结果的上确界．该算法具有分布性,搜索空间缩减快,适合于中小型的多agent系统的子任务分配．     

分布式发电系统中的人工智能技术

总结分布式发电系统运行于孤立模式和并网模式时需要考虑的主要问题,全面综述多代理系统（MAS）、人工神经网络（ANN）、遗传算法（GA）和模糊逻辑（FL）等典型人工智能技术在分布式发电系统中应用情况及国内外的研究现状,分析并指出各种方法在应用中存在的问题和解决思路．提出一种基于高速配电网通信技术（PLC）和Multi-agent技术的网络化分布式发电系统协调控制系统方案．     

求解最短路径问题的DNA动态规划算法

最短路径问题是一个组合优化问题,许多交通运输、工程、管理等实际问题可转化为最短路径问题进行求解。文中利用DNA计算的并行计算模式,给出一个求解最短路径问题的DNA动态规划算法,该算法最多需要7n-11个生物操作。     

企业动态联盟风险防范体系研究

企业动态联盟的组建、运作及解散存在着诸多有待解决的新的风险管理问题．在对其风险识别与评估的基础上，建立了这种新型组织形式的风险防范体系框架。以此为企业动态联盟风险管理实践提供支持和参考．     

求解动态路径诱导K路最短问题的人工免疫优化方法

针对智能交通诱导系统中传统最短K路算法的运行效果不佳，提出一种新型人工免疫优化搜索算法，并将其应用于扩展节点法建立的城市交通路网模型，实现了城市交通诱导系统的最优K路搜索．该算法基于生物免疫系统的免疫记忆功能，具有全局性并行搜索的特点．在K路最短问题求解时能同时给出K条最短路径，不存在遗传算法的早熟现象并具有更好的并行处理能力．示例仿真验证了算法的有效性与实用性．     

Distributed collaborative extremum response surface method for mechanical dynamic assembly reliability analysis

To make the dynamic assembly reliability analysis more effective for complex machinery of multi-object multi-discipline （MOMD）,distributed collaborative extremum response surface method （DCERSM） was proposed based on extremum response surface method （ERSM）.Firstly,the basic theories of the ERSM and DCERSM were investigated,and the strengths of DCERSM were proved theoretically.Secondly,the mathematical model of the DCERSM was established based upon extremum response surface function （ERSF）.Finally,this model was applied to the reliability analysis of blade-tip radial running clearance （BTRRC） of an aeroengine high pressure turbine （HPT） to verify its advantages.The results show that the DCERSM can not only reshape the possibility of the reliability analysis for the complex turbo machinery,but also greatly improve the computational speed,save the computational time and improve the computational efficiency while keeping the accuracy.Thus,the DCERSM is verified to be feasible and effective in the dynamic assembly reliability （DAR） analysis of complex machinery.Moreover,this method offers an useful insight for designing and optimizing the dynamic reliability of complex machinery.