【作者】 王金荣；

【导师】 曹洁；

【作者基本信息】 兰州理工大学 ， 模式识别与智能系统， 2012， 硕士

【摘要】 明胶浓度是明胶生产过程的重要参数之一，它在一定程度上反映了明胶质量的高低，因此明胶浓度的检测速度影响着整个明胶的生产进程。国内明胶企业大都采用人工定时采样、离线检测的方法测量胶液浓度，但这样不仅容易污染样本，也使测量出现滞后。为改变现有胶液浓度的测量方式，提高明胶生产的自动化水平，借助软测量建模的优势，通过测量易获得的辅助变量推导出难测量的主导变量，实现明胶浓度的在线测量。目前国内对明胶浓度在线测量的研究较少，已有的研究成果中所建的模型均为单一模型，所选的辅助变量为时间和温度，但是单模型存在建模过程特性匹配不佳、精度和外推能力差等缺陷。本文以青海明胶公司提胶工序为研究背景，以提胶工序中较难测量的胶液浓度为研究对象，认真分析明胶生产工艺，对从工业现场采集的数据进行分析，选取与胶液浓度密切相关且较易测量的时间、温度和比重作为辅助变量。为减小各数据因数量级差异对测量结果造成的影响，本文对数据进行了归一化处理，然后建立一系列软测量多模型，以实现明胶浓度的在线测量。本文分别建立了基于BP_Adaboost的多模型、基于模糊C均值聚类(FuzzyC-means, FCM)算法的支持向量机多模型和基于GK聚类(Gustafson_Kessel, GK)算法的径向基函数多模型，并将所建多模型用于测量明胶浓度。与相同算法的单模型测量结果进行对比，结果显示多模型具有更高的测量精度。为使所建立的软仪表能真正发挥实际效用，本文最后将MATLAB与VC进行混合编程。选用MATLAB引擎与VC编程方法相结合，将MATLAB强大的计算功能与VC良好的运行环境完美匹配，建立人机交互界面，从而实现真正意义上软仪表的现场应用。更多还原

【Abstract】 Concentration of gelatin is one of the important parameters of the gelatinproduction process, it can be reflects the level of quality of gelatin, so the gelatinconcentration detection speed affect the gelatin production process. Domestic gelatinmanufacturers mostly use artificial timing sampling method to measure liquidconcentrations, but this is not easily contaminated sample, but also measured with alag. In order to change the existing glue concentration measurement, improve thelevel of automation of the gelatin production, we deduced dominant variable difficultto measure by measuring auxiliary variable which are easily accessible with theadvantage of the soft sensor modeling to achieve the online measurement of theconcentration of gelatin.This paper takes the Qinghai Gelatin company refining processes technology asthe background and takes the concentration of gelatin as study object, after carefulanalysis of the gelatin production process and analyze data collected from anindustrial site, we select time, temperature and specific gravity which are easiermeasurement closely related to the glue concentration as an auxiliary variable.Toreduce the impact on the measurement results by the data due to differences inmagnitude, the data were normalized, and then create a series of soft measurementmodel to achieve the online measurement of the concentration of gelatin.In this paper, multi-models based on BP_Adaboost and the fuzzy C-meansclustering (Fuzzy C-means FCM) algorithm and support vector machine and GKclustering (Gustafson_Kessel, GK) algorithm of radial basis function is establishedrespectively and the multi-models used to measure the concentration of gelatin.werecompared with the single model use the same algorithm, measurement results showthat the multi-model has a higher measurement accuracy.To make the soft instrument really play the practical utility, we use the MATLABand VC for mixing programme. Combine the MATLAB engine and the VCprogramming methods and match the powerful computing features in MATLAB andVC operating environment perfectly, and create interactive interface, a true sense ofthe soft sensor field applications is realized at last.更多还原