惯性特征系统最速特征模型PID控制参数辨识

以惯性特征系统作为研究对象,针对常规PID控制器参数的设置问题提出了基于系统最速特征模型的辨识算法,该算法利用惯性特征系统的输入输出特性,通过最小二乘法辨识出系统的一阶特征模型,然后再根据一阶特征模型、控制律和系统的动、稳态性能的要求辨识出系统的二阶最速特征模型,同时也计算出PID控制器的参数.仿真结果表明,该算法能够使PID控制具有最速响应的特征,为PID参数设置提供了一种计算方法.     

三道庄矿微震信号辨识应用研究

针对三道庄矿生产作业环境复杂,从大量掺杂着的干扰信号中提取有效信号,有效地应用微震信号对岩石稳定性进行评价,对可能产生的破坏灾害进行预测具有重要意义。文章对该矿山各种微震信号源按实际监测需要进行了大致分类,分为岩体破裂信号、噪音信号和爆破信号三大类。在大量现场微震监测基础上,总结出了微震信号经验辨识法和频谱分析辨识法。利用经验辨识方法从波形振幅值、持续时间、上升时间、信号间隔等方面对各种震源波形的直观特征进行了辨识;利用频谱分析法对各种微震震源频率成分进行分析,总结出了三道庄矿各种微震震源信号特征。研究成果给矿山现场快速准确提取有用微震信号提供了依据。     

轧机垂直系统动力学参数辨识

 针对轧机垂直系统动力学参数可信度不足等问题，提出一种基于实测数据的改进粒子群算法辨识轧机垂直系统动力学参数的方法。首先,将轧机垂直系统刚度和阻尼考虑成达芬振子和范德波尔振子，构建轧机垂直系统非线性动力学模型，并对粒子群算法进行改进；然后，通过数值仿真算例辨识得到系统在感染噪声和不含噪声时的动力学参数，验证了该算法的有效性；最后，以现场某轧机垂直系统为研究对象，基于现场实测数据，应用该算法进行辨识，得到了轧机垂直系统动力学参数估计，通过实测位移、速度和加速度信号分别与辨识后的位移、速度和加速度信号进行对比，证明该方法辨识轧机垂直系统动力学参数结果可靠，具有一定的工程应用价值。     

球磨机磨矿系统多变量辨识建模的研究

针对球磨机磨矿系统难以理论推导出磨矿系统的数学模型问题,应用最小二乘法估计的多变量ARX模型辨识的算法,给出了球磨机系统模型的离散形式。同时结合试验中球磨机的内部负荷参数(介质填充率、料球比、磨矿浓度)与功率消耗建立出磨矿系统的动态数学模型,详细介绍了利用MATLAB辨识工具箱建模方法及其辨识的实现过程。通过模型输出曲线与实际输出曲线的对比,表明该模型具有较高的准确性,为球磨机实现高效低能过程控制提供理论依据。     

基于FIR神经网络的热连轧机时滞动态模型辨识

介绍一种FIR神经网络模型及其时变反传算法，并把它用于纯滞后非线性MIMO系统模型辨识；以带钢热连轧受控对象为例，建立2机架的小偏差模型，并进行了仿真；使用FIR神经网络模型对仿真数据进行了模型辨识，辨识结果显示了网络良好的性能。     

TRT装置顶压控制过程在高炉上料操作中的系统辨识

正常工况下高炉间歇上料所造成的料柱变化是引起高炉煤气余压透平发电装置(TRT)炉顶压力不稳定的主要因素.从机理上详细分析了TRT系统中高炉料柱变化对炉顶压力的影响,结合系统辨识的方法,建立了以透平机静叶开度和高炉料柱的料线高度为输入,以高炉炉顶压力为输出的系统动态模型,并采用TRT系统现场运行数据对所建立的模型进行了验证.结果表明,所建立的数学模型很好地描述了TRT系统中高炉上料间歇操作与炉顶压力之间的定量关系,模型辨识比较精确.     

系统辨识在轧制过程建模中的应用

本文在介绍以往的建模方法的基础上,引入了一种新的轧制过程建模方法——系统辨识,并介绍了选择PRBS信号参数的方法。最后对一个实际的张力AGC控制系统进行了系统辨识的实验,建立了该系统的动态控制方程,该方程已应用于厚度自动控制系统中。     

应用系统辨识方法建立锅炉蒸汽发生系统的数学模型

本文阐述了应用系统辨识方法建立数学模型的原理和方法,并根据某厂35t/h中锅炉蒸汽发生系统的实测数据,采用OLS和RLS法对对象的数学模型进行了辨识。与阶跃响应法所得实验模型进行了比较,证明前者精度优于后者。     

现代化安全管理在东南井扩邦工程中的推广应用

在东南井扩邦施工中应用危险源辨识法与定置管理及点检相结合的现代化安全管理措施，取得了安全，快速的施工效果。     

基于遗传算法的两类热工对象的模型辨识

针对火电厂热工对象的特点和目前对热工对象辨识方法的不足,本文提出了一种用改进遗传算法辨识模型方法,解决了热工过程中两类热工对象的建模问题.并以过热汽温系统和水位系统为例,在Matlab平台上模拟现场操作信号进行仿真,结果表明,该方法简单易行,具有很好的辨识能力和比较满意的辨识精度,而且通用性很好,它不仅适用于过热汽系统模型辨识,它还适用于其它有迟延高阶热工对象.     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.