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《可再生能源》2017,(8)
文章利用垃圾焚烧烟气的在线监测数据,探索建立二噁英类浓度与烟气中其他污染物浓度、工况参数的多元回归预测模型,从而实现对烟气中二噁英类浓度的间接实时监测,但受限于二噁英类浓度的监测成本高,可供回归预测训练的样本少的问题,线性回归预测模型的泛化能力较弱、稳定性较差。使用非线性的支持向量回归方法建模,有助于解决这一问题。文章使用3种核函数构建支持向量回归预测模型,应用华南地区某垃圾焚烧厂的10组监测数据作为训练集和测试集,比较了支持向量回归预测和多元线性回归预测的相对误差。研究结果表明,训练集为8组数据时,支持向量回归预测的相对误差明显小于多元线性回归,尤其是模型使用1阶多项式核函数和径向基核函数时的最大百分比误差较小,泛化能力较强。 相似文献
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通过对比较法测试得到34种车辆噪声的满意度评价,应用支持向量回归机建立车辆噪声声音品质之间的预测模型,对排气噪声的满意度进行了预测,在相同的训练与测试样本集下,与多元线性回归模型预测结果进行了对比。结果表明:向量回归机回归模型预测值更接近实测值,具有更小的预测误差,更强的泛化能力。采用向量回归机模型构建的车辆排气噪声主观评价预测模型可以获得理想的样本满意度测试结果,平均预测误差不超过8%,最大只有7.36%,小于2%的样本是4个,其余样本介于3%~6%范围内,比较接近。 相似文献
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鉴于支持向量机(SVM)存在结构稀疏化不足、缺乏概率信息等缺陷,将性能更具优势的相关向量机(RVM)理论引入到大坝变形预测的应用中。选择高斯径向基函数作为RVM模型的核函数,核参数用基于模拟退火的混合粒子群算法(SAPSO)进行寻优,进而建立SAPSO-RVM回归预测模型。实例应用结果表明,RVM模型的向量数量远小于SVM模型,在保持良好泛化能力的前提下计算结构得到简化,混合粒子群算法相较于一般粒子群算法其全局寻优能力也有所提高,SAPSO-RVM模型回归预测精度较高。 相似文献
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《中外能源》2017,(5)
数理统计方法和地质理论结合已逐渐成为研究复杂储层的方向。由于致密砂岩储层的复杂性,其孔隙度、渗透率与测井资料不只是简单的线性关系,常用的线性回归方法难以满足致密砂岩储层物性研究的精度要求。选取致密砂岩储层研究区内3口取心井511个岩心分析样品,首先运用贝叶斯判别法将储层砂岩分为三类:石英砂岩、岩屑砂岩和岩屑石英砂岩,然后采用多元逐步回归、主成分分析和支持向量机方法对不同类型砂岩分别进行建模,对比各方法得出的复相关系数,发现支持向量机回归得到的复相关系数明显高于其他两种方法 ,且支持向量机回归方法得到的预测值与原始值的平均绝对误差也是最小的。支持向量机模型效果检验结果表明,孔隙度绝对误差小于1.5%,渗透率绝对误差小于0.25×10~(-3)μm~2,说明该模型预测效果较好,适用于研究区致密砂岩储层物性参数建模。 相似文献
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《International Journal of Hydrogen Energy》2022,47(63):26789-26797
The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO2 and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized. 相似文献
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基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁(MgO),研究了该型MgO膨胀剂(MEA)细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析(TG DSC)分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45 μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。 相似文献
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应用瞬态谱分析方法对燃烧流化床声波信号进行了频谱分析,发现气泡能量分布呈Gamma分布形式,在Argyrious和Yoshida等人提出的模型的基础上,发展了燃烧流化床气泡能量分布模型,并通过优化迭代对模型参数进行求解,在实验和理论的基础上得出了更加切合实际的燃烧流化床气泡能量分布模型 相似文献
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Linear and nonlinear analyses of the instabilities and distortion of liquid streams injected into a gaseous media are discussed. The various fundamental mechanisms and the predictive capabilities for the distortions are emphasized. Round jets, planar sheets, annular sheets, and conical sheets are discussed in detail. The balance between capillary and inertial forces is primarily examined. The method for simplifying the analyses in the case of thin liquid sheets is discussed. The capabilities for representing the droplet size distribution that follows the stream disintegration are outlined. 相似文献
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城镇生活污水处理装置是由农村户用沼气地发展演变而来,是一种小型、分散化处理污水的装置 ,是环境建设的需要。文章着重从我国环保政策及目标、生活污水造成的污染状况、急需整治的公共设施、生活污水净化装置的演变以及社会经济效益和环境效益等方面,阐述了其产业化的重要性。 相似文献
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The paper deals with second law thermodynamic analysis of a basic gas turbine based gas-steam combined cycle. The article investigates the effect of variation of cycle parameters on rational efficiency and component-wise non-dimensionalised exergy destruction of the plant. Component-wise inefficiencies of the combined cycle have been quantified with the objective to pin-point the major sources of exergy destruction. The parameter that affects cycle performance most is the TIT (turbine inlet temperature). TIT should be kept on the higher side, because at lower values, the exergy destruction is higher. The summation of total exergy destruction of all components in percentage terms is lower (44.88%) at TIT of 1800 K & rp,c = 23, as compared to that at TIT = 1700 K. The sum total of rational efficiency of gas turbine and steam turbine is found to be higher (54.91%) at TIT = 1800 K & rp,c = 23, as compared to that at TIT = 1700 K. Compressor pressure ratio also affects the exergy performance. The sum total of exergy destruction of all components of the combined cycle plant is lower (44.17%) at higher value of compressor pressure ratio (23)& TIT = 1700 K, as compared to that at compressor pressure ratio (16). Also exergy destruction is minimized with the adoption of multi-pressure-reheat steam generator configuration. 相似文献
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使用ANSYS8.0软件对高速列车车轮进行了三维有限元分析,计算出车轮在直线、曲线和道岔条件下牵引、制动共6种工况时孔边薄弱部位的应力,分别通过Mises等效平均应力方法、Sines平均主应力方法和应力分量中考虑平均应力方法计算出应力在极值位置时的等效应力幅、等效平均应力,从而进一步算出车轮的安全系数,对其疲劳强度进行评定,并对3种方法进行了比较研究。 相似文献