微流体装置力源机构的优化设计  

Optimization Design of the Force Source Mechanism for Microfluidic Device

作　　者：余晴 刘冲[1] 李经民[1] YU Qing;LIU Chong;LI Jing-min(Dalian University of Technology,Key Laboratory for Micro/Nano Technology and System of Liaoning Province,Liaoning Dalian 116024,China)

机构地区：[1]大连理工大学辽宁省微纳米技术及系统重点实验室,辽宁大连116024

出　　处：《机械设计与制造》2024年第4期229-233,共5页Machinery Design & Manufacture

基　　金：国家重点研究计划(2020YFB2009002)。

摘　　要：为解决微流控系统中流体介质贮存装置输出压力不稳定等问题,设计了一种柔顺机构作为装置的力源机构。该柔顺机构基于正负刚度叠加理论设计,由四根固定导向梁和两根平面弹簧组成。首先,利用链式梁约束模型和广义打靶法分别求解出固定导向梁和平面弹簧的位移-载荷特性,建立优化模型,得到了满足设计要求的最优解。然后,为验证计算模型的准确性,使用ANSYS对柔顺梁进行大变形分析,结果显示该计算模型和有限元分析相比,误差小于1%。最后,通过实验发现该柔顺机构输出力的实验值和理论设计值存在误差,经过分析发现是加工精度、材料弹性模量误差以及只考虑了中性轴的变形等原因所导致的。In order to solve the problem of unstable output pressure of the fluid storage device in microfluidic system,a compliant mechanism is designed as the force source mechanism of the device.The compliant mechanism is designed based on the superposi-tion theory of positive and negative stiffness,and consists of four fixed guide beams and two planar springs.Firstly,the displacement-load relationship of the fixed guide beam and the planar spring is solved by using the chain beam constraint model and the generalized shooting method,and then the optimal solution satisfying the design requirements is obtained by the estab-lished optimization model.Secondly,in order to verify the accuracy of the calculation model.ANSYS is used to analyze the large deformation of the compliant beam,and the results show that the error of the calculation model is less than 1%compared with the finite element analysis.Finally,it is found that there are errors between the experimental value and theoretical design value of the output force of the compliant mechanism after experiment,which may be caused by machining accuracy,material elastic modu-lus error and only considering the deformation of the neutral axis.

关 键 词：微流控系统 柔顺机构 广义打靶法 链式梁约束模型 大变形分析 

分 类 号：TH16[机械工程—机械制造及自动化]