摘要
NASTRAN刚性连接单元RBE3中的权因子需要人为设定,由此导致分配节点载荷具有较强的主观性。针对该问题,基于结构刚度矩阵的缩聚原理提出一种精确的刚性连接单元,该单元可将指定节点上的载荷精确分配至结构的主要承力节点,并能有效克服RBE3单元中权因子不直观且难以确定的缺点。通过算例验证,表明采用本文所提出的精确刚性连接单元可以精确完成由加载节点到主要承力节点的载荷分配计算,且所得载荷分配结果更为精确可靠。
The rigid connection element（RBE3）in NASTRAN requires the user to specify the weight factor of each main structure node subjectively.As a result,the user defined load weight factors make the calculation of the distributed loads inaccurate.To deal with this drawback,a new rigid connection element based on the principle of structure stiffness matrix condensation is proposed to accurately calculate the distributed loads acting at the specified node to the main structure nodes.Consequently,the new element effectively overcomes the subjectivity of the RBE3 element.The numerical results show that the new element can accurately derive the load distribution of the main structure nodes and make the solution of distributed loads more accurate and reasonable.
作者
何鹏秋
孙秦
He Pengqiu Sun Qin(School of Aeronautics, Northwestern Polytechnical University, Xi~an 710072, China)
出处
《航空工程进展》
CSCD
2017年第1期68-72,共5页
Advances in Aeronautical Science and Engineering
基金
国家自然科学基金(51375386)
关键词
刚性连接单元
RBE3
载荷分配
刚度缩聚
刚度特性
rigid connection element
RBE3
load distribution
stiffness matrix condensation
stiffness property
