基于松弛试验的蓖麻籽压榨非线性流变模型  

A nonlinear rheological model of castor pressing based on stress-relaxation tests

作　　者：黄志辉[1] 杨星星[1] 曹玉[1] 肖志红[2] 刘汝宽[2] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]湖南省林业科学院,湖南长沙410004

出　　处：《华南农业大学学报》2015年第2期100-105,共6页Journal of South China Agricultural University

基　　金：国家林业局林业公益性行业科研专项(201304608);国家科技支撑计划(2011BAD22B04)

摘　　要：【目的】揭示蓖麻籽压榨过程中的流变特征.【方法】利用单轴压榨试验装置进行应力松弛试验,获取了松弛过程中应力与时间关系.基于试验结果和半理论半经验法,利用改进的广义Maxwell模型建立了蓖麻籽压榨非线性流变模型,使用非线性回归法分段对模型参数进行求解,并将模型计算值与试验结果对比.【结果和结论】综合对比结果可知:模型模拟值与应力松弛试验结果吻合较好,该模型能较好的模拟压榨应变大于0.65时蓖麻籽的非线性流变特性.【Objective】To reveal rheological characteristics in the process of castor seed press. 【Method】The stress-time relationship of stress-relaxation process was obtained by stress-relaxation tests with the uniaxial compression equipment. Based on the results and the semi-theoretical and semi-empirical method,a nonlinear rheological model was established using the improved generalized Maxwell model. The parameters of the model were achieved by nonlinear regression method. The calculated values of model were compared with the experimental results. 【Result and conclusion】The results show that the model calculated values matching well with the experimental results,which means the model can simulate nonlinear rheological properties of castor seeds when the strain is over 0. 65.

关 键 词：蓖麻籽 应力松弛 改进的广义Maxwell模型 非线性流变模型 

分 类 号：TB24[一般工业技术—工程设计测绘]