摘要
在对麦类作物茎秆整体抗倒性的研究中,针对作物茎秆结构参数如弹性模量、惯性矩、节间长度以及载荷分布等在不同节间的变化情况,建立了变刚度杆件模型,采用初参数法对该模型的临界载荷作了分析。通过对乳熟期的小麦品种晋农190的测试,得到了其在不同节间位置处的结构参数,采用变刚度模型对该品种的承重能力作了计算,得到该品种的安全系数为1.97,表明该品种有较强的抗倒伏能力。针对该品种茎秆各节间局部失稳的分析表明,该品种在自重及穗重作用下很难发生Brazier屈曲。
In the study of lodging resistance of wheat stalk,a culm model with varying stiffness was established from wheat stalk by the variation of structural parameters,such as the Young＇s modulus,inertia moment,the length of the internode,load and so on,in different internodes along the stalk height,and its critical load was analyzed by using initial parameter method.With tests performed on the wheat variety of Jinnong 190 in the milk stage,the structural parameters were obtained in different internodes.Based on the proposed model,the critical load was estimated and the safety factor was concluded as 1.97,which showed Jinnong 190 had a better ability in lodging resistance.The local bucking analyses showed that the Brazier buckling was hard to occur in the internodes of Jinnong 190 with the effects of its self weight and the tip weight.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2012年第2期70-74,共5页
Transactions of the Chinese Society for Agricultural Machinery
基金
高等学校博士学科点专项科研基金资助项目(20060113002)
关键词
小麦
茎秆
力学模型
临界载荷
Wheat
Stalk
Mechanical model
Critical load
