oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 1 )

2018 ( 32 )

2017 ( 47 )

2016 ( 55 )

Custom range...

Search Results: 1 - 10 of 2243 matches for " 费孝顺 "
All listed articles are free for downloading (OA Articles)
Page 1 /2243
Display every page Item
一种新型高温合金在900和1 100 ℃下200 h的氧化行为
孝顺,赵玉涛,梁向锋,徐维台
- , 2018, DOI: 10.11951/j.issn.1005-0299.20170453
Abstract: 涡轮叶片工作温度的不断提高,使得制备叶片的镍基单晶高温合金的合金化程度越来越高,而涡轮叶片在高温下的氧化行为影响着叶片的工作寿命.为此,本文以一种新型镍基高温合金为研究对象,利用氧化动力学曲线、X射线衍射分析,扫描电镜和能谱仪研究其在900和1 100 ℃下200 h的高温氧化行,并探究新型合金的氧化机理.研究发现:新型合金在900 ℃氧化时,表面氧化膜未发生剥落,动力学曲线遵循抛物线规律;在1 100 ℃氧化时,合金增重迅速且表面氧化膜剥落严重,新型合金内部出现了多层不连续的Al2O3内氧化层.研究结果表明:900 ℃时,新型合金中Cr含量降低的同时没有增加Re和Ta等活性元素,导致新型合金不能在氧化初期通过选择性氧化迅速形成保护性Cr2O3氧化膜,因此,增重迅速;1 100 ℃时,由于外氧化层的碎裂剥落,合金内部氧通量再次升高,已生成的Al2O3保护性氧化膜被消耗突破,合金进一步氧化,直到氧通量随着氧化的进行再次降低至适合Al2O3保护性氧化膜生成为止.
As the operating temperature of the turbine blade continues to increase, the degree of alloying of the nickel-based single crystal superalloy for the blades become higher and higher. The oxidation behavior of turbine blades at high temperatures affects the working life of the blades. To this end, this article uses a new nickel-base superalloy as the research object, using oxidation kinetic curves, X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy to study its high-temperature oxidation behavior at 900 and 1 100 ℃ for 200 h and oxidation mechanism of new alloys. It was found that when the new alloy was oxidized at 900 ℃, and the surface oxide film did not peel off and the kinetic curve followed the parabolic law. At 1 100 ℃, the alloy gained weight quickly and the surface oxide film peeled off seriously. A multi-layer discontinuous Al2O3 inner oxide layer appeared inside the alloy. The results showed that: at 900 ℃, the content of Cr in the new alloy decreased without increasing the active elements such as Re and Ta. As a result, the new type of alloy could not rapidly form a protective Cr2O3 oxide film by selective oxidation at the initial stage of oxidation. Therefore, weight was rapidly gained. At 1 100 ℃, due to the spalling of the outer oxide layer, the oxygen flux that had been reduced to a suitable selective oxidation of Al element increased again. The oxide protective film formed was consumed excessively, and the internal oxidation region in the alloy was further expanded until the oxygen flux decreases with oxidation again to generate a protective Al2O3 film.
互联电网AGC功率动态分配的虚拟发电部落协同一致性算法
孝顺, 余涛
中国电机工程学报 , 2015, DOI: 10.13334/j.0258-8013.pcsee.2015.15.002
Abstract: 为适应智能电网能量管理系统(energymanagementsystem,EMS)从集中式走向分散式的发展趋势,建立了一种分散自治的自动发电控制(automaticgenerationcontrol,AGC)功率分配框架。把传统区域电网分成若干个领地电网,结合了多智能体一致性协同理论,分别以调节费用和爬升时间为一致性状态变量,提出基于虚拟发电部落一致性的功率动态分配方法。标准两区域模型仿真表明,虚拟发电部落协同一致性方法能有效解决未来智能电网AGC功率分配的分散自治问题。
互联电网自动发电控制功率分配的改进逼近于理想解的排序--Q多目标优化算法
Stochastic optimal generation command dispatch of interconnected power grids based on improved multi-objective technique for order preference similar to an ideal solution–Q algorithm

孝顺,余涛
控制理论与应用 , 2015, DOI: 10.7641/CTA.2015.40649
Abstract: 本文提出了一种多目标决策与强化学习相结合的改进的逼近于理想解的排序(technique for order preference similar to an ideal solution, TOPSIS)--Q算法, 有效解决 了自动发电控制(automatic generation control, AGC)总功率 指令分配到风电、水电、火电等各类AGC机组的动态随机多目标优化问题. 算法采用3个不同的目标$Q$值矩阵进行迭代更新, 然后 利用改进TOPSIS方法对$Q$值矩阵进行多目标决策处理, 客观地给出各目标的动态最优权重系数, 从而得到各状态--动作对的综合评价判据. IEEE标准两区域模型仿真研究验证了改进TOPSIS--Q算法在AGC机组功率多目标动态优化分配过程应用的可行性和有效性, 在复杂 随机扰动的环境中提高系统CPS性能的同时, 有效降低了AGC机组调节成本和碳排放.
This paper proposes an improved technique for order preference similar to an ideal solution (TOPSIS)–Q learning approach to solve the dynamic optimization of generation command dispatch (GCD) for automatic generation control (AGC) in a multi-energy power system. Three optimization objectives are simultaneously optimized by three different Q-value matrixes. Then dynamic optimal weight of each objective is calculated by improved TOPSIS method such that the evaluation criterion of each state-action is obtained. Case studies are carried out to evaluate the optimization performance of the proposed algorithm in the two-area load frequency control (LFC) power system model. Simulation results indicate that the proposed method is feasible and effective for dynamic optimization of GCD problem, and can reduce the regulating cost and carbon emissions while improving the control performance of AGC systems in the complex stochastic power system.
基于小波变换的多分辨率分析分割算法的研究
The Multi-Resolution Analysis Segmentation Research Based on Wavelet
 [PDF]

洪亮
Hans Journal of Data Mining (HJDM) , 2012, DOI: 10.12677/hjdm.2012.22003
Abstract: 跳频信号以其自身优良的抗截获、抗干扰能力,在军事通信中得到了广泛的应用,因此,对跳频信号的截获展开研究具有非常重要的现实意义。本文采用时频联合分析的方法,深入研究了跳频信号在线自动盲检测和频点搜索捕获问题,并对其特征参数提取算法进行了研究。针对跳频信号的特征提取,研究了一种基于小波脊线的特征提取算法,通过matlab仿真实验对方法的性能进行了验证,实验表明基于小波脊线的特征提取算法有很大的性能优势,进一步提高了频率估计的准确性和时效。
Frequency hopping signals in their own excellent anti-interception, anti-interference ability, in the military communication has been widely applied, therefore, it has a very important practical significance for the research of interceptting the frequency hopping signals. In this paper, the joint time-frequency analysis, in-depth study of the frequency hopping signal line automatic detection and frequency blind search acquisition issues, and its feature extraction algorithm is studied. Frequency hopping signals for feature extraction of a feature based on wavelet ridge extraction algorithm, the matlab simulation results the performance of the method was validated by experimental results show that the characteristics of wavelet ridge extraction algorithm is very performance advantages, and further improve the frequency estimation accuracy and timeliness.
菝葜醋酸乙酯提取物对大鼠和小鼠的抗炎作用
孝顺,高中洪,杨祥良
中国中药杂志 , 2006,
Abstract: 目的:研究菝葜醋酸乙酯提取物对大鼠和小鼠急性、慢性炎症的抗炎作用。方法:采用蛋清致足肿胀、甲醛致足肿胀、二甲苯致耳肿胀和醋酸致腹膜炎模型,对菝葜醋酸乙酯提取物对急性(早期)、慢性(晚期)炎症的抗炎作用进行研究,处理为正常对照组:生理盐水,10mL.kg-1;乙酰水杨酸阳性对照组(200mg.kg-1);菝葜提取物剂量为生药50,100g.kg-1剂量组,均灌胃给药。结果:在生药50~100g.kg-1剂量范围内,提取物能显著降低蛋清诱导的大鼠足跖肿胀度、甲醛诱导的小鼠足肿胀程度、小鼠腹腔毛细血管通透性增高和二甲苯诱导的耳廓肿胀,同时对炎症晚期也有一定的抑制作用。结论:菝葜醋酸乙酯提取物对急性、早期炎症具有明显的抗炎作用,对炎症晚期也有一定的抑制作用。
用大孔吸附树脂分离菝葜总皂苷的条件优化
孝顺高中洪,杨祥良
中国中药杂志 , 2005,
Abstract: 目的:开发一种高效、实用的提取、分离菝葜总皂苷的技术。方法:以总皂苷吸附量和解吸率为指标,对4种树脂进行了筛选,并研究吸附与解吸优化条件。结果:所选出的非极性大孔树脂HPD100,在实验条件下对菝葜总皂苷的吸附量和解吸率分别达到16mg·mL-1和90%。结论:HPD100型树脂能很好地用于吸附、分离菝葜总皂苷。
基于多步回溯Q(λ)学习的电网多目标最优碳流算法
孝顺,郑理民,余涛
电力系统自动化 , 2014, DOI: 10.7500/AEPS20140513010
Abstract: 为弥补传统最优潮流计算中缺少对电力网络的碳排放优化控制,文中利用基于潮流计算结果的碳流模型,提出了一种基于半马尔可夫决策过程的Q(λ)学习算法,把潮流问题中的约束、可控变量转换成算法的状态和动作,并以线性加权方式把碳流损耗、网损和电压稳定分量转化为奖励函数,通过不断试错与迭代来动态寻找最优动作策略。将该算法在IEEE57节点标准算例中进行了验证,取得了良好效果,为解决电网多目标最优碳流问题提供了一种可行、有效的方法。
基于分层相关均衡强化学习的CPS指令优化分配算法
孝顺,余涛,唐捷
电力系统自动化 , 2015, DOI: 10.7500/AEPS20140506012
Abstract: 提出了一种应用在控制性能标准(CPS)下自动发电控制(AGC)指令(CPS指令)由调度端至各台机组的动态分配过程的分层多智能体相关均衡(HCEQ)算法。根据机组调频时延对其进行聚类分层,有效解决了CPS指令分配过程的维数灾难问题。相比单智能体强化学习算法,HCEQ算法引入了均衡目标函数的求解,有效提高了算法寻优速度。将功率偏差、水电裕度和调节成本目标以线性加权的方法转化为算法奖励函数,研究了不同权值下CPS控制性能和调节成本的变化关系。南方电网模型仿真研究表明,HCEQ算法具有较快的收敛速度,在复杂随机扰动的环境中能有效提高系统CPS考核合格率,并有效降低AGC调节成本。
孤岛智能配电网下的快速自动发电控制机组一致性协同控制算法
Collaborative consensus algorithm for automatic generation control in an islanded smart distribution grid

张泽宇,孝顺,余涛
控制理论与应用 , 2016, DOI: 10.7641/CTA.2016.50162
Abstract: 由于可再生能源随机性、间歇性的特征和智能电网“即插即用”的要求, 传统的集中式AGC控制方法面临诸多 挑战, 分布自治与集中协调已成为智能配电网的未来发展方向. 为此, 本文提出了一种基于等微增率的AGC机组一致性 协同控制算法, 解决了孤岛智能配电网的频率自治与协同控制问题; 并提出了一种“虚拟一致性变量”的概念, 用于解 决AGC机组功率越限导致的拓扑变化问题和实现AGC机组的“即插即用”; 同时, 在智能配电网发生负荷扰动的情况 下, 为保证所有机组在新的工况下仍能达到最优经济运行, 建立了AGC功率分配与短期经济调度的协同目标. 最后搭建 了包含多种分布式电源及多个微网的智能配电网模型, 仿真表明: 与传统集中控制方法相比, 一致性协同算法动态优化 速度快, 收敛鲁棒性强, 能有效解决孤岛智能配电网的频率自治与协同控制问题.
Due to the feature of the randomness and intermittency of renewable energy and the requirement of ‘plug and play’ of smart grid, the traditional centralized AGC control methods face many challenges, decentralized autonomy and centralized coordinate have become the development direction of the smart distribution grid. Therefore, a collaborative consensus algorithm based on equal incremental principle for AGC is proposed to solve the problem of frequency autonomy and cooperative control of islanded smart distribution grid. A ‘virtual consensus variables’ is introduced to manage about topological change caused by power exceeding of AGC generation units and implement ‘plug and play’. Meanwhile, to ensure that all units can achieve optimal economic operation when load disturbance occurs, a cooperative objective of AGC power distribution and short term economic dispatch is established. Finally, a smart distribution grid model including different types of micro sources and micro grids is constructed. In contrast with the traditional centralized control methods, collaborative consensus algorithm shows its advantages on computing speed and convergence robustness, and it provides a new way to solve frequency autonomy and cooperative control problem of islanded smart distribution grid effectively.
基于纳什均衡迁移学习的碳-能复合流自律优化
Nash equilibrium inspired transfer learning for self-organizing optimal carbon-energy combined-flow

陈艺璇,孝顺,余涛
控制理论与应用 , 2018, DOI: 10.7641/CTA.2017.70612
Abstract: 提出了一种全新的纳什均衡迁移学习算法, 并应用于求解大规模电力系统分散式碳–能复合流自律优化. 首次引入碳排放责任分摊机制, 避免了碳排放责任的重复计算. 将大规模电网分解成若干小型区域电网, 每个小型 区域电网被定义为一个智能体, 通过纳什博弈实现分散式自律优化. 智能体利用记忆矩阵对寻优知识进行存储, 并 通过多个个体与环境的反复交互实现记忆更新; 采用状态–动作链对记忆矩阵进行降维, 有效避免了“维数灾难”. 此外, 基于相似度的迁移学习可以对历史任务知识进行高效提炼, 提高了新任务寻优效率. IEEE 57和300节点系统 仿真表明: 所提算法非常适合求解大规模电网的碳–能复合流自律优化, 在保证纳什均衡解质量的同时, 明显加快 寻优速度.
This paper proposes a novel Nash equilibrium inspired transfer learning (NETL) for decentralized selforganizing optimal carbon-energy combined-flow of large-scale power systems. A shared responsibility of carbon emission is firstly considered, such that a double counting of carbon emission can be eliminated. Moreover, the whole power system is partitioned to the multiple subsystems, in which each subsystem is treated as an agent. The Nash game is introduced to satisfy the self-organizing optimal operation of each agent. Every agent stores its knowledge by the memory matrix, and a group of individuals is employed by agents to update their memories by interactions with the environment. The associated state-action chains are adopted to handle the curse of dimension. Transfer learning mechanism can refine the knowledge of the prior tasks efficiently thus dramatically accelerating the new tasks. The simulation on IEEE 57-bus system and IEEE 300-bus system verify that NETL is particularly geared to handle the self-organizing optimal carbon-energy combinedflow of large-scale power systems, which can ensure the quality of the Nash equilibrium solution as well as significantly accelerate the searching speed.
Page 1 /2243
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.