改进的粒子群优化液压伺服模糊控制系统研究

电液伺服系统是一个不确定的非线性复杂系统,传统PID控制往往难以取得理想的控制效果。为了提高煤矿机器人机械臂电液伺服系统的控制精度和稳定性,提出一种基于改进的粒子群算法优化液压伺服系统模糊PID控制器参数的方法,避免了模糊PID控制中参数选取的经验性及参数不变性等问题。应用改进的粒子群算法优化模糊PID控制器参数,可以增强控制器的自适应能力,提高其控制性能。仿真测试表明,改进的粒子群优化模糊PID控制系统的响应性能明显提髙,超调量小,稳态性能好。     

基于单神经元PID控制的电液比例调高系统研究

以采煤机电液比例阀控缸位置控制系统为研究对象,建立了电液比例阀控缸位置控制系统的数学模型,利用单神经元与PID相互结合的控制方法,在simulink中设计单神经元的采煤机电液比例阀控缸位置控制系统自适应PID控制器,在有负载扰动下进行仿真,并对突变负载扰动时常规PID控制和基于单神经元PID控制进行阶跃响应对比。仿真结果显示单神经元自适应PID控制器比常规PID控制系统具有较强的鲁棒性、自适应性,对采煤机电液比例调高控制能够达到自适应控制。     

基于PID控制的实验液压机电液伺服系统的仿真分析

以QD-100型实验液压机电液伺服系统为例,利用PID控制器设计的方法,在MAT-LAB/Simulink环境下对液压机电液伺服系统进行计算机仿真,并对仿真结果进行分析。     

模糊PID控制器在跳汰机排料系统中的应用研究

跳汰机排料系统是一个多参数、非线性、大滞后的时变系统,传统的PID控制方式由于控制器参数的选择及调整不便使得其控制性能不太令人满意。本文针对排料系统设计了一种可在线自整定PID参数的模糊PID控制器。通过MATLAB仿真实验比较了系统模型在线改变时本文所设计控制器与常规PID控制器的控制性能,结果表明本文所设计模糊PID控制器的控制性能明显优于常规PID控制器。     

模糊PID控制器在刮板机链条的张力控制

本文建立了刮板机张力控制模型,并结合模糊控制和PID控制技术设计了模糊PID控制器,分析了模糊PID控制器对链条张力的控制原理,研究了参数非线性、时变性对刮板输送机链条张力控制系统的影响,制定了模糊控制规则以及模糊推理的方法。利用MATLAB软件对建立的模型进行的仿真,表明模糊PID控制有较好的执行性能,较好地满足刮板机链条的张力控制要求。     

乳化液泵站的模糊PID控制系统仿真

介绍了模糊PID在乳化液泵站控制系统的应用,以乳化液泵站液压系统为研究对象,并建立系统的数学模型。利用MATLAB/Simulink工具包对PID控制器和模糊PID控制器的控制效果进行仿真分析,研究表明模糊PID控制器具有模糊控制快速、适应性强和常规PID高精度的优点。     

基于模糊神经PID控制器的掘进机悬臂运动控制系统

掘进机悬臂机构的负载变化具有很强的随机性。为能实现悬臂运动的精确控制和提高巷道成形质量,设计了将模糊神经PID控制器应用于掘进机悬臂运动的控制系统,即该控制器将控制掘进机悬臂液压缸运动的电液比例阀工作电流偏差e和偏差变化率ec作为输入变量。重点介绍了控制器的结构组成、网络模型和学习过程。该系统利用Matlab/Simulink对电液比例阀的模型进行了仿真,结果表明该控制器不仅具有较强的鲁棒性,而且在被控对象参数发生较大变化时能自适应地调整PID参数,基本满足了掘进机悬臂运动控制的要求。     

SMA-电机复合驱动的救援机器人夹持器控制与研究

根据煤矿井下救援机器人末端执行器位置精度控制要求,设计SMA-电机复合驱动的夹持器,提出模糊控制和PID复合控制。首先设计了复合夹持器的结构,对防爆处理进行了研究,然后建立了夹持器的数学模型,设计了模糊控制器,并利用MATLAB建立系统模型和仿真研究。仿真结果表明,模糊PID控制策略应用于SMA-电机复合夹持器具有较好的控制效果,实现了救援机器人末端执行器的精准位置控制。     

基于遗传算法和模糊PID的采煤机滚筒调高系统研究

针对采煤工况复杂和滚筒调高系统,采用电液伺服控制的非线性、参数时变的特点,设计了模糊自适应PID控制器。由于遗传算法具有良好的全局寻优特性,用遗传算法对自适应模糊PID参数进行了优化,得到最优的控制器参数,从而得到最优控制效果。采用MATLAB/SIMULINK仿真,仿真结果表明,经过遗传算法优化的自适应模糊PID控制器的控制效果具有调节时间短、超调量明显减小、稳态误差小,其对滚筒高度的控制效果得到明显提高,能更好地满足应用要求。     

基于MATLAB的输送带配料模糊PID控制的仿真研究

结合模糊控制与PID控制的优点,采用模糊PID控制器控制输送带配料系统,通过数学分析法对输送带配料系统进行建模,利用MATLAB中的Simulink仿真软件对系统进行仿真。仿真的结果表明,模糊PID控制相对于常规PID控制方法,能够明显地提高系统的动态性能和配料精度。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。