摘要
单元划分法是柔性机构分析的重要方法,由于在建模过程中假设各单元间所受力为均布力,因此忽略了集中力所导致的柔性单元间接触截面的变形误差。以柔性摆杆为例研究柔性单元间接触截面的变形规律。采用传统的单元刚度矩阵法建立柔性摆杆的刚度模型,通过与有限元分析结果的对比,证实不考虑柔性单元间接触截面的微观变形将会导致较大的分析误差。将接触截面的变形考虑进理论分析中进行补偿后,结果显示补偿后理论分析结果与有限元分析结果的偏差明显减小。同时,通过改变柔性摆杆的关键机构参数进一步仿真,给出四大机构参数对柔性摆杆机构中柔性单元间接触截面变形的影响规律,并提出在柔性机构设计中降低这种接触截面变形对分析结果影响的具体建议。
The flexible unit division method is commonly adopted for compliant mechanism analysis. It is assumed that there is only even pressure between flexible units and neglect the deformation error of contact surface between flexible units, which is caused by concentrated force. The contact surface deformation rules are studied by taking compliant rocking beam as an example. Rigidity model of the compliant rocking beam is established using the common unit stiffness matrix method. By comparing the computed results with that of ANSYS software, it is pointed out that there will be a relatively greater analysis error by neglecting the contact surface micro-deformation between flexible units. After compensating this kind of surface micro-deformation in theoretical analysis, the error is greatly reduced. And then, the further experiments are completed by altering its structure parameters. Results have depicted the contact surface deformation rules between flexible units under four different structure parameters. Some useful suggestions are also presented about how to reduce the disadvantageous effects caused by contact surface deformation for compliant mechanism design.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第9期17-23,共7页
Journal of Mechanical Engineering
基金
山东省优秀中青年科学家科研奖励基金(BS2011ZZ013
BS2012ZZ009)
山东理工大学青年教师发展支持计划资助项目
关键词
柔性机构
柔性单元
接触截面
变形
Compliant mechanism Flexible unit Contact surface Deformation
