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饲用甜高粱秸秆应力松弛特性及参数优化的试验研究
杜晓雪, 郭文斌, 王春光, 王洪波, 靳敏, 刘晓东, 李建
内蒙古农业大学 机电工程学院, 呼和浩特 010018
摘要:
为研究甜高粱秸秆压缩过程中的流变特性,利用多功能电子蠕变松弛试验机及自制压缩装置进行甜高粱压缩过程的应力松弛试验研究。选取压缩密度、切碎段长度、含水率为试验因素,选取应力迅速衰减时间和平衡弹性模量作为应力松弛特性评价指标,利用Box-Behnken试验方案进行三因素三水平响应面试验分析。结果表明:甜高粱秸秆压缩过程的应力松弛模型可用广义Maxwell模型中的五元件方程表示,其拟合系数>0.99;各因素影响应力迅速衰减时间的主次顺序为:切碎段长度 > 含水率 > 压缩密度;对平衡弹性模量影响的主次顺序为:切碎段长度 > 压缩密度 > 含水率;甜高粱应力松弛最佳优化参数组合:当压缩密度为647.38 kg/m3,切碎段长度为20~30 mm,含水率为57%时,应力迅速衰减时间为4.693 s,平衡弹性模量89.957 kPa。试验确定了出捆后最佳捆绳及缠膜时间,为甜高粱压缩、打捆收获机的开发提供了技术依据。
关键词:  甜高粱  秸秆  压缩  应力松弛  参数优化
DOI:10.11841/j.issn.1007-4333.2019.02.14
分类号:
基金项目:国家重点研发计划课题(2016YFD0701704)
Stress relaxation characteristics and parameters optimization of feed sweet sorghum
DU Xiaoxue, GUO Wenbin, WANG Chunguang, WANG Hongbo, JIN Min, LIU Xiaodong, LI Jian
College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
Abstract:
To study the rheological properties of sweet sorghum straw during the compression process, a stress relaxation test of the sweet sorghum compression process was performed by using a multifunctional electronic creep relaxation tester and a self-made compression device. Taking the compressed density, cutting length, moisture content as test factors and rapid stress decay time and balance elastic modulus as stress relaxation characteristics evaluation, three factors and three levels response surface test analysis was conducted by using the Box-Behnken test protocol. The results showed that the stress relaxation model of the sweet sorghum straw was expressed by the five-element equation in the generalized Maxwell model. The fitting coefficients were all above 0.99. The order of each factor to the rapid stress decay time was:Cutting length > moisture content > compressed density. The order of the balance elastic modulus was:Cutting length > compressed density > moisture content; The optimal optimization parameter combination of Sweet sorghum stress relaxation:The compressive density was 637.38 kg/m3, the cutting length was 20-30 mm, the moisture content was 57%, the rapid stress decay time was 4.693 s, the balance elastic modulus was 89.957 kPa. The test results confirmed the best bundled rope and the wrapping films time, which provided the basis for the compressing and binding of sweet sorghum.
Key words:  sweet sorghum  straw  compression  stress relaxation  parameter optimization
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