The lever-type mechanism is one of the most widely used compliant mechanisms in precision engineering applications. To achieve large amplification ratios, the lever-type mechanisms are often connected in series. However, overstress during the deformation process of the mechanism appears frequently, resulting in the undesired deformation and the distortion of amplification ratios. Also, the enveloping area of the lever-type mechanism is relatively large, which limits its further application. This paper presents a novel combined compliant mechanism for translation amplification, which consists of a bridge mechanism and a two-stage lever mechanism. The compact mechanism could avoid overstress while maintaining a large amplification ratio. Firstly, the design of the mechanism is introduced. The corresponding amplification ratio is modeled and verified by the finite element method. This model includes the vertical drift of flexure hinges in the mechanism, which is consistent with the motion direction of the combined mechanism. Also, the flexures in the levers are characterized. For the sake of avoiding overstress and attaining a large amplification ratio, an optimization of the model is conducted by the genetic algorithm. The optimization results show that more than 100% improvement on the amplification ratio has been achieved, and the maximum stress of the mechanism is admissible. The optimized compliant mechanism is fabricated and tested. Quasi-static and dynamic experiments demonstrate that the amplification factor shows a good agreement with the analytical model.

杠杆式机构是精密工程应用中使用最广泛的顺应机构之一。为了实现大的放大率，杠杆式机构通常串联连接。然而，在机构的变形过程中经常出现过应力，从而导致不希望的变形和放大率的失真。而且，杠杆式机构的包围区域相对较大，这限制了其进一步的应用。本文提出了一种用于翻译扩增的新型组合顺应性机构，其由桥机构和两级杠杆机构组成。紧凑的机构可以避免过大的应力，同时保持较大的放大率。首先介绍了机构的设计。通过有限元方法对相应的放大率进行建模和验证。该模型包括机构中挠性铰链的垂直漂移，这与组合机构的运动方向一致。同样，杠杆中的挠曲也具有特征。为了避免过大压力并获得较大的放大率，通过遗传算法对模型进行了优化。优化结果表明，已经实现了放大率超过100％的改善，并且该机构的最大应力是允许的。优化的顺应性机构已制造并经过测试。准静态和动态实验表明，放大因子与分析模型具有很好的一致性。该模型包括机构中挠性铰链的垂直漂移，这与组合机构的运动方向一致。同样，杠杆中的挠曲也具有特征。为了避免过大的压力并获得较大的放大率，通过遗传算法对模型进行了优化。优化结果表明，已经实现了放大率超过100％的改善，并且该机构的最大应力是允许的。优化的顺应性机构已制造并经过测试。准静态和动态实验表明，放大因子与分析模型具有很好的一致性。该模型包括机构中挠性铰链的垂直漂移，这与组合机构的运动方向一致。同样，杠杆中的挠曲也具有特征。为了避免过大压力并获得较大的放大率，通过遗传算法对模型进行了优化。优化结果表明，已经实现了放大率超过100％的改善，并且该机构的最大应力是允许的。优化的顺应性机构已制造并经过测试。准静态和动态实验表明，放大因子与分析模型显示出良好的一致性。为了避免过大的压力并获得较大的放大率，通过遗传算法对模型进行了优化。优化结果表明，已经实现了放大率超过100％的改善，并且该机构的最大应力是允许的。优化的顺应性机构已制造并经过测试。准静态和动态实验表明，放大因子与分析模型显示出良好的一致性。为了避免过大的压力并获得较大的放大率，通过遗传算法对模型进行了优化。优化结果表明，已经实现了放大率超过100％的改善，并且该机构的最大应力是允许的。优化的顺应性机构已制造并经过测试。准静态和动态实验表明，放大因子与分析模型具有很好的一致性。优化的顺应性机构已制造并经过测试。准静态和动态实验表明，放大因子与分析模型显示出良好的一致性。优化的顺应性机构已制造并经过测试。准静态和动态实验表明，放大因子与分析模型显示出良好的一致性。