会议名称：
The Second International Joint Conference on Computational Science and Optimization(CSO 2009)(2009 国际计算科学与优化会议)
会议时间：
2009-04-24
会议地点：
三亚
会议论文集名称：
The Second International Joint Conference on Computational Science and Optimization(CSO 2009)(2009 国际计算科学与优化会议)论文集
摘要：
The microstructures of peanut cake under five applied pressures were measured using stereo light microscope and Image-pro software. Fractal dimensions of pore section border and pore size distribution were measured and calculated by the slit island process. Regression method was used to analyse the correlation between the fractal dimension and applied pressure. Results showed that the fractal characteristic of pore structure in peanut cake was obvious, and its fractal dimension values decreased significantly with increasing applied pressure.
摘要：
In view of effect of fluid-solid coupling on flow of oil fluids through media and effect of rheology on fluid-solid coupling, the numerical simulation models of mechanical oil expression from vegetable oil wet-e developed. The models were solved by using of combining finite difference with finite element. The displacement experiments for extracted peanut were used to validate the models. The predicted values are in good agreement with the measured ones.
期刊：
2008 INTERNATIONAL SYMPOSIUM ON INFORMATION PROCESSING AND 2008 INTERNATIONAL PACIFIC WORKSHOP ON WEB MINING AND WEB-BASED APPLICATION,2008年:373-378
摘要：
The microstructures of sesame cake under five applied pressures were measured using stereo light microscope and Image-pro software. Fractal dimensions of pore section border and pore size distribution were measured and calculated by the slit island process. Regression method was used to analyse the correlation between the fractal dimension and applied pressure. Results showed that the fractal characteristic of pore structure of sesame cake was obvious, the pore structure and its fractal dimension were significantly affected by applied pressure. There existed good linear correlations between applied pressure and fractal dimensions of the pore section border and pore size distribution. Their fractal dimension values decreased significantly with increasing applied pressure. It was concluded that with increasing applied pressure the pore section border is further twisty, the pore wall further rough, the pore shape further irregular and the pore size distribution further complicated.
摘要：
A prediction model of compression ratio for extruded oilseeds was developed based on improved BP neural networks. As an applied example, the predicted curves were successfully used to predict critical pressing pressures. Results indicated that the predicted values of compression ratios conformed to the measured values well for extruded cottonseed and castor been. There was a limiting compression for extruded oilseeds under given conditions. The compression ratios for extruded cottonseed had more rapid increase from 0 to 40 MPa of applied pressure. less increase from 40 to 80 MPa and insignificant increase over 80 MPa, and for extruded castor bean had more rapid increase from 0 to 60 MPa of applied pressure, less increase from 60 to 100 MPa and insignificant increase over 100 MPa. 80 and 100 MPa of applied pressure were identified as the critical pressing pressure for extruded cottonseed and castor bean respectively.
摘要：
Friction between rubber roller and paddy or brown rice for paddy dehulling was much characteristic compared with that between two solid bodies. Paddy or brown rice was approximately considered as a rigid body, while rubber roller was considered as complete elastic body. Mathematical simulation of friction for paddy dehulling had been developed based upon the theory of elasticity, and of adhesion and hysteresis friction. Calculation results indicated that the adhesion force had dominant influence on the frictional force, and the hysteresis force could be negligible under normal conditions. The effect of the hysteresis force on the frictional force was significance and not negligible only in case high total radial pressure. The models revealed that the frictional force and power consumed acted on the long and narrow paddy were larger than those of the short and wide paddy when the total radial stress and shear strength of husk were the same for two kinds of paddy. The models also revealed, from another point of view, why the dehulling rate would increase with the increase of the difference of velocity between fast roller and slow roller.
摘要：
By using of combining theoretical model with empirical model, the nonlinear viscoelastic-plastic constitutive equations of soybean and cottonseed were developed on the basis of the creep test. The parameter inverse problem of constitutive model was proposed using improved particles swarm optimization. Numerical simulations of creep of soybean and cottonseed were carried out. The definition of critical pressing time for oil extraction and the method for determining the critical pressing time using creep rate were proposed. The values of critical pressing time for extruded soybean and cottonseed under six applied pressures were evaluated Results indicated that the nonlinear viscoelastic-plastic constitutive model could simulate rheological behaviors of soybean and cottonseed very well. Mean relative deviations between the experimental and predicted values of soybean and cottonseed were 1.55% and 1.93%, respectively. There were significant decreases in the values for the creep rates in the early stage of pressing, and decreases to an insignificant and stabilize value in the later stage.
摘要：
Stress-strain relationship is the most important properties of physical mechanics of oilseeds during mechanical pressing. In view of the difficulty for establishing a mathematical model due to the complexity of physical mechanics performance, the stress-strain identification model for oilseeds based on BP neural network was developed to simulate the relationship. The identification results that the maximum error was less than 0.00005 and the maximum training times was less than 100 indicated that the method of stress-strain identification for cottonseed and castor bean by using artificial neural networks is both feasible and effective.
作者机构：
[郑晓; 林国祥; 王少梅; 李智] Department of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China;College of Logistic Engineering, Wuhan University of Technology, Wuhan 430062, China
通讯机构：
Department of Mechanical Engineering, Wuhan Polytechnic University, China
