MODELING NONLINEAR DYNAMICS OF CIRCULATING FLUIDIZED BEDS USING NEURAL NETWORKS |
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作者姓名: | WeiChen AtsushiTsutsumi HaiyanLin KentaroOtawara |
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作者单位: | [1]DepartmentofChemicalSystemEngineering,TheUniversityofTokyo,Tokyo113-8656,Japan [2]ProjectManagementDivision,KurehaTechnol.Eng.Co.,Iwaki974-8232,Japan |
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摘 要: | In the present work, artificial neural networks (ANNs) were proposed to model nonlinear dynamic behaviors of local voidage fluctuations induced by highly turbulent interactions between the gas and solid phases in circulating fluidized beds. The fluctuations of local voidage were measured by using an optical transmittance probe at various axial and radial positions in a circulating fluidized bed with a riser of 0.10 m in inner diameter and 10 m in height. The ANNs trained with experimental time series were applied to make short-term and long-term predictions of dynamic characteristics in the circulating fluidized bed. An early stop approach was adopted to enhance the long-term prediction capability of ANNs. The performance of the trained ANN was evaluated in terms of time-averaged characteristics, power spectra, cycle number and short-term predictability analysis of time series measured and predicted by the model.
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关 键 词: | 非线性力学 人工神经网络 数学模型 循环流化床 流体力学 |
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