基于震动力平衡及应力约束的柔顺机构拓扑优化设计

Shaking Force Balancing and Stress Constraint for Compliant Mechanisms Design through Topology Optimization

针对目前柔顺机构平衡方式的缺陷,提出一种以震动力平衡为优化目标,应力为约束条件,并实现设计与平衡一体化(或面向平衡的设计,DFB)的柔顺机构拓扑优化设计新方法.该拓扑优化主要采用基础结构法,在柔顺机构优化模型中引入应力约束条件,并采用总质心位移法、添加弹簧质心法和变截面配重质心法3种方法实现柔顺机构的震动力平衡优化,通过Matlab软件仿真验证了方法的有效性并通过比较仿真结果找出其中最优方法.该研究成果对于柔顺机构在组织工程学等领域的应用,如生物体内的植入式柔顺机构,有着重大意义.

Aimed at the defect of the common shaking torce balancing way of compnant mec.amsm, d new approach was provided for integrated design and force balancing （or design for balancing, DFB） of compliant mechanisms under the stress constraint by means of the topology optimization technique. A particular topology optimization called ground structure approach was employed to achieve this goal. As the contribution of the work, stress constraint is introduced in the design model for compliant mechanisms based on the topology optimization technique. And the implementation of three methods for realizing full force balancing of compliant mechanisms with the topology optimization technique include mass-center-displacement approach, add-of-spring approach, and changing-cross-section-areas approach are demonstrated. The simulation is described to validate the proposed approach. The DFB compliant mechanism may find exciting applications in tissue engineering where physical systems are embedded in a biological system.